انجمن احتراق ایران سوخت و احتراق 2008-3629 18 4 2025 12 24 Numerical investigation of the effects of cavity flameholder geometric parameters on the combustion performance of ramjet and scramjet engines بررسی عددی اثر پارامترهای هندسی شعله‌نگه‌دار حفره‌ای بر عملکرد احتراقی موتورهای رم‌جت و اسکرَم‌جت 242580 10.22034/jfnc.2026.566615.1453 FA میلاد مهرپویا گروه منهدسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد 0009-0008-4316-0836 سجاد راستگو کروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد جواد سپاهی یونسی گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد 0000-0002-8803-1068 Journal Article 2025 10 12 <strong><span>In ramjet and scramjet engines, due to the very high velocity of the incoming flow into the combustion chamber, efficiency and effective fuel–air mixing face significant challenges. One efficient method to increase fuel residence time and create a suitable recirculation zone for stable combustion is the use of cavity flameholders. Despite the widespread application of this method, the effect of cavity geometry on combustion performance in both ramjet and scramjet engines, especially under heated conditions, still requires comprehensive investigation. The aim of this study is to numerically investigate the effect of cavity geometric parameters—including height, length, and ramp angle—on combustion efficiency in both ramjet and scramjet engines. For this purpose, simulations were performed using ANSYS Fluent with the SST k–ω turbulence model in a compressible, hydrogen-fueled combustion configuration. The results indicate that increasing the cavity height in both engines improves combustion efficiency. Reducing the cavity length can also enhance combustion efficiency in both engines. These findings can serve as a basis for optimizing flameholder geometry in future supersonic engines.</span></strong> <strong><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتورها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>رم</span><span>‌</span><span>جت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>اسکرَم</span><span>‌</span><span>جت،</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>دل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> </span><span dir="RTL"><span>سرعت</span></span><span dir="RTL"> </span><span dir="RTL"><span>بس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ار</span></span><span dir="RTL"> </span><span dir="RTL"><span>بالا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>جر</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ان</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق،</span></span><span dir="RTL"> </span><span dir="RTL"><span>پا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>دار</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شعله</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>اختلاط</span></span><span dir="RTL"> </span><span dir="RTL"><span>مؤثر</span></span><span dir="RTL"> </span><span dir="RTL"><span>سوخت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>چالش</span></span><span dir="RTL"> </span><span dir="RTL"><span>جد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>روبه</span><span>‌</span><span>رو</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>روش</span><span>‌</span><span>ها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>کارآمد</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>زمان</span></span><span dir="RTL"> </span><span dir="RTL"><span>ماند</span></span><span dir="RTL"> </span><span dir="RTL"><span>سوخت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>جاد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ناح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ه</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازچرخش</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>مناسب</span></span><span dir="RTL"> </span><span dir="RTL"><span>جهت</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق،</span></span><span dir="RTL"> </span><span dir="RTL"><span>استفاده</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>شعله</span><span>‌</span><span>نگه</span><span>‌</span><span>دارها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>حفره</span><span>‌</span><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>باوجود</span></span><span dir="RTL"> </span><span dir="RTL"><span>کاربرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>گسترده</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>روش،</span></span><span dir="RTL"> </span><span dir="RTL"><span>تأث</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر</span></span><span dir="RTL"> </span><span dir="RTL"><span>هندسه</span></span><span dir="RTL"> </span><span dir="RTL"><span>حفره</span></span><span dir="RTL"> </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>هر</span></span><span dir="RTL"> </span><span dir="RTL"><span>دو</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتور</span></span><span dir="RTL"> </span><span dir="RTL"><span>رم</span><span>‌</span><span>جت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>اسکرَم</span><span>‌</span><span>جت،</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span><span>‌</span><span>و</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ژه</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>شرا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ط</span></span><span dir="RTL"> </span><span dir="RTL"><span>گرم،</span></span><span dir="RTL"> </span><span dir="RTL"><span>هنوز</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ازمند</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>جامع</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>هدف</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>پژوهش،</span></span><span dir="RTL"> </span><span dir="RTL"><span>مطالعه</span></span><span dir="RTL"> </span><span dir="RTL"><span>عدد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>اثر</span></span><span dir="RTL"> </span><span dir="RTL"><span>پارامترها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هندس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>حفره</span></span><span dir="RTL"> </span><span dir="RTL"><span>شامل</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارتفاع،</span></span><span dir="RTL"> </span><span dir="RTL"><span>طول</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>زاو</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ه</span></span><span dir="RTL"> </span><span dir="RTL"><span>سطح</span></span><span dir="RTL"> </span><span dir="RTL"><span>ش</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ب</span><span>‌</span><span>دار</span></span><span dir="RTL"> </span><span dir="RTL"><span>انتها</span></span><span dir="RTL"><span>یی</span></span><span dir="RTL"> </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>دو</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتور</span></span><span dir="RTL"> </span><span dir="RTL"><span>رم</span><span>‌</span><span>جت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>اسکرَم</span><span>‌</span><span>جت</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>منظور،</span></span><span dir="RTL"> </span><span dir="RTL"><span>شب</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ه</span><span>‌</span><span>ساز</span></span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>ها</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>استفاده</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>نرم</span><span>‌</span><span>افزار</span></span><span dir="RTL"> </span><span>ANSYS Fluent</span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>مدل</span></span><span dir="RTL"> </span><span dir="RTL"><span>آشفتگ</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span>SST k–ω</span><span dir="RTL"> </span><span dir="RTL"><span>به</span><span>‌</span><span>صورت</span></span><span dir="RTL"> </span><span dir="RTL"><span>تراکم</span><span>‌</span><span>پذ</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر،</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>حالت</span></span><span dir="RTL"> </span><span dir="RTL"><span>گرم</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>سوخت</span></span><span dir="RTL"> </span><span dir="RTL"><span>ه</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>دروژن</span></span><span dir="RTL"> </span><span dir="RTL"><span>انجام</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>نشان</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>دهد</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارتفاع</span></span><span dir="RTL"> </span><span dir="RTL"><span>حفره</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>هر</span></span><span dir="RTL"> </span><span dir="RTL"><span>دو</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتور</span></span><span dir="RTL"> </span><span dir="RTL"><span>موجب</span></span><span dir="RTL"> </span><span dir="RTL"><span>بهبود</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>شود</span></span><span dir="RTL">. </span><span dir="RTL"><span>کاهش</span></span><span dir="RTL"> </span><span dir="RTL"><span>طول</span></span><span dir="RTL"> </span><span dir="RTL"><span>حفره</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ز</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>تواند</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>را</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>هر</span></span><span dir="RTL"> </span><span dir="RTL"><span>دو</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتور</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>دهد</span></span><span dir="RTL">. </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>افته</span><span>‌</span><span>ها</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>توانند</span></span><span dir="RTL"> </span><span dir="RTL"><span>مبنا</span></span><span dir="RTL"><span>یی</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>نه</span><span>‌</span><span>ساز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هندسه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شعله</span><span>‌</span><span>نگه</span><span>‌</span><span>دار</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>موتورها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>فراصوت</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>آ</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>نده</span></span><span dir="RTL"> </span><span dir="RTL"><span>باشند</span></span><span dir="RTL">.</span></strong> https://www.jfnc.ir/article_242580_b2d6b60e3181079bc8b18b4122015525.pdf

انجمن احتراق ایران سوخت و احتراق 2008-3629 18 4 2025 12 31 Numerical Simulation of the Effects of Inlet Shape on the Combustion Chamber Performance of a Hypersonic Projectile شبیه سازی عددی اثرات شکل ورودی هوا در عملکرد محفظه احتراق یک پرتابه مافوق صوت 242581 10.22034/jfnc.2026.549461.1444 FA مصطفی محمودی گروه جلوبرنده- دانشگاه مالک اشتر 0009-0000-1754-3966 محسن شجاعی دانشگاه مالک اشتر افشین ولی محمد دانشگاه مالک اشتر Journal Article 2025 10 12 <strong><span>In this study, an air intake was designed for the combustion chamber of a supersonic projectile operating at flight conditions of Mach 3.4 and an altitude of 15 km. Initially, a three-dimensional design methodology for the supersonic air intake is presented. Subsequently, the designed intake was integrated with the combustion chamber, and its performance was evaluated. To ensure the accuracy of the analyses, the simulation process was validated against the results of an existing combustion chamber. The results indicate that the air intake’s performance closely aligns with the calculated theoretical values. The maximum error observed was 6.25%, corresponding to the Mach number at the first section of the intake. The obtained total pressure recovery factor also showed a 2.43% difference compared to the calculated values. The performance of the combustion chamber, using the airflow supplied by the intake, was examined, yielding a combustion temperature of 1298 K and a combustion efficiency of 83.5%. Furthermore, the distance between the air inlet and the fuel injection point was reduced to investigate its effect on combustion. It was determined that at a distance-to-diameter ratio of 1, the combustion efficiency increased by 3.9%.</span></strong> <strong><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>پژوهش</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرتابه</span></span><span dir="RTL"> </span><span dir="RTL"><span>مافوق</span></span><span dir="RTL"> </span><span dir="RTL"><span>صوت</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>شرا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ط</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرواز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>عدد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ماخ</span></span><span dir="RTL"> </span><span dir="RTL"><span>4/3 </span></span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارتفاع</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرواز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> 15 </span><span dir="RTL"><span>ک</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>لومتر</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ابتدا</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>روش</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>مافوق</span></span><span dir="RTL"> </span><span dir="RTL"><span>صوت</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>صورت</span></span><span dir="RTL"> </span><span dir="RTL"><span>سه</span></span><span dir="RTL"> </span><span dir="RTL"><span>بعد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارائه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>متصل</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>آن</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>منظور</span></span><span dir="RTL"> </span><span dir="RTL"><span>اطم</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>نان</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>صحت</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span><span>‌</span><span>ها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>انجام</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>روند</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>موجود،</span></span><span dir="RTL"> </span><span dir="RTL"><span>اعتبارسنج</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>هندسه</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>کپارچه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>شبکه</span></span><span dir="RTL"><span>‌</span></span><span dir="RTL"><span>بند</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>اساس</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقاد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر</span></span><span dir="RTL"> </span><span dir="RTL"><span>اشاره</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>نزد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>ب</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>شتر</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>خطا</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>زان</span></span><span dir="RTL"> </span><span dir="RTL"><span>25/6 </span></span><span dir="RTL"><span>درصد،</span></span><span dir="RTL"> </span><span dir="RTL"><span>مربوط</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>عدد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ماخ</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقطع</span></span><span dir="RTL"> </span><span dir="RTL"><span>اول</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>ضر</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ب</span></span><span dir="RTL"> </span><span dir="RTL"><span>باز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>اب</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>فشار</span></span><span dir="RTL"> </span><span dir="RTL"><span>بدست</span></span><span dir="RTL"> </span><span dir="RTL"><span>آمده</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ز</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>سه</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقاد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>43/2</span></span><span dir="RTL"> </span><span dir="RTL"><span>خطا</span></span><span dir="RTL"> </span><span dir="RTL"><span>دارد</span></span><span dir="RTL">. </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>مواجهه</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>افت</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>مورد</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>قرار</span></span><span dir="RTL"> </span><span dir="RTL"><span>گرفت</span></span><span dir="RTL"> </span><span dir="RTL"><span>که</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>دما</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> 1298 </span><span dir="RTL"><span>کلو</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ز</span></span><span dir="RTL"> </span><span dir="RTL"><span>5/83</span></span><span dir="RTL"> </span><span dir="RTL"><span>درصد</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>فاصله</span></span><span dir="RTL"> </span><span dir="RTL"><span>محل</span></span><span dir="RTL"> </span><span dir="RTL"><span>پاشش</span></span><span dir="RTL"> </span><span dir="RTL"><span>سوخت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>کاهش</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>افت</span></span><span dir="RTL"> </span><span dir="RTL"><span>تا</span></span><span dir="RTL"> </span><span dir="RTL"><span>تأثیر</span></span><span dir="RTL"> </span><span dir="RTL"><span>آن</span></span><span dir="RTL"> </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شود</span></span><span dir="RTL"> </span><span dir="RTL"><span>که</span></span><span dir="RTL"> </span><span dir="RTL"><span>مشخص</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>نسبت</span></span><span dir="RTL"> </span><span dir="RTL"><span>فاصله</span></span><span dir="RTL"> 1 </span><span dir="RTL"><span>برابر</span></span><span dir="RTL"> </span><span dir="RTL"><span>قطر،</span></span><span dir="RTL"> </span><span dir="RTL"><span>راندمان</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>9/3</span></span><span dir="RTL"> </span><span dir="RTL"><span>درصد</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>داشته</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">.</span></strong> <strong><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>پژوهش</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرتابه</span></span><span dir="RTL"> </span><span dir="RTL"><span>مافوق</span></span><span dir="RTL"> </span><span dir="RTL"><span>صوت</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>شرا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ط</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرواز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>عدد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ماخ</span></span><span dir="RTL"> </span><span dir="RTL"><span>4/3 </span></span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارتفاع</span></span><span dir="RTL"> </span><span dir="RTL"><span>پرواز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> 15 </span><span dir="RTL"><span>ک</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>لومتر</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ابتدا</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>روش</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>برا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>مافوق</span></span><span dir="RTL"> </span><span dir="RTL"><span>صوت</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>صورت</span></span><span dir="RTL"> </span><span dir="RTL"><span>سه</span></span><span dir="RTL"> </span><span dir="RTL"><span>بعد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>ارائه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>طراح</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>متصل</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>آن</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>منظور</span></span><span dir="RTL"> </span><span dir="RTL"><span>اطم</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>نان</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>صحت</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span><span>‌</span><span>ها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>انجام</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>روند</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>موجود،</span></span><span dir="RTL"> </span><span dir="RTL"><span>اعتبارسنج</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>هندسه</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>کپارچه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>شبکه</span></span><span dir="RTL"><span>‌</span></span><span dir="RTL"><span>بند</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>تحل</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>اساس</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقاد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر</span></span><span dir="RTL"> </span><span dir="RTL"><span>اشاره</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>نتا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ج</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>نزد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ک</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>ب</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>شتر</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>خطا</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>م</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>زان</span></span><span dir="RTL"> </span><span dir="RTL"><span>25/6 </span></span><span dir="RTL"><span>درصد،</span></span><span dir="RTL"> </span><span dir="RTL"><span>مربوط</span></span><span dir="RTL"> </span><span dir="RTL"><span>به</span></span><span dir="RTL"> </span><span dir="RTL"><span>عدد</span></span><span dir="RTL"> </span><span dir="RTL"><span>ماخ</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقطع</span></span><span dir="RTL"> </span><span dir="RTL"><span>اول</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">. </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>ضر</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ب</span></span><span dir="RTL"> </span><span dir="RTL"><span>باز</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>اب</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>فشار</span></span><span dir="RTL"> </span><span dir="RTL"><span>بدست</span></span><span dir="RTL"> </span><span dir="RTL"><span>آمده</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ز</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>سه</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقاد</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ر</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شده،</span></span><span dir="RTL"> </span><span dir="RTL"><span>43/2</span></span><span dir="RTL"> </span><span dir="RTL"><span>خطا</span></span><span dir="RTL"> </span><span dir="RTL"><span>دارد</span></span><span dir="RTL">. </span><span dir="RTL"><span>عملکرد</span></span><span dir="RTL"> </span><span dir="RTL"><span>محفظه</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>مواجهه</span></span><span dir="RTL"> </span><span dir="RTL"><span>با</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>افت</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>از</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>مورد</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>قرار</span></span><span dir="RTL"> </span><span dir="RTL"><span>گرفت</span></span><span dir="RTL"> </span><span dir="RTL"><span>که</span></span><span dir="RTL"> </span><span dir="RTL"><span>مقدار</span></span><span dir="RTL"> </span><span dir="RTL"><span>دما</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> 1298 </span><span dir="RTL"><span>کلو</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ن</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>بازده</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>ن</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ز</span></span><span dir="RTL"> </span><span dir="RTL"><span>5/83</span></span><span dir="RTL"> </span><span dir="RTL"><span>درصد</span></span><span dir="RTL"> </span><span dir="RTL"><span>محاسبه</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL">. </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>ادامه</span></span><span dir="RTL"> </span><span dir="RTL"><span>فاصله</span></span><span dir="RTL"> </span><span dir="RTL"><span>محل</span></span><span dir="RTL"> </span><span dir="RTL"><span>پاشش</span></span><span dir="RTL"> </span><span dir="RTL"><span>سوخت</span></span><span dir="RTL"> </span><span dir="RTL"><span>و</span></span><span dir="RTL"> </span><span dir="RTL"><span>ورود</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>هوا</span></span><span dir="RTL"> </span><span dir="RTL"><span>کاهش</span></span><span dir="RTL"> </span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>افت</span></span><span dir="RTL"> </span><span dir="RTL"><span>تا</span></span><span dir="RTL"> </span><span dir="RTL"><span>تأثیر</span></span><span dir="RTL"> </span><span dir="RTL"><span>آن</span></span><span dir="RTL"> </span><span dir="RTL"><span>بر</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>بررس</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>شود</span></span><span dir="RTL"> </span><span dir="RTL"><span>که</span></span><span dir="RTL"> </span><span dir="RTL"><span>مشخص</span></span><span dir="RTL"> </span><span dir="RTL"><span>شد</span></span><span dir="RTL"> </span><span dir="RTL"><span>در</span></span><span dir="RTL"> </span><span dir="RTL"><span>نسبت</span></span><span dir="RTL"> </span><span dir="RTL"><span>فاصله</span></span><span dir="RTL"> 1 </span><span dir="RTL"><span>برابر</span></span><span dir="RTL"> </span><span dir="RTL"><span>قطر،</span></span><span dir="RTL"> </span><span dir="RTL"><span>راندمان</span></span><span dir="RTL"> </span><span dir="RTL"><span>احتراق</span></span><span dir="RTL"> </span><span dir="RTL"><span>9/3</span></span><span dir="RTL"> </span><span dir="RTL"><span>درصد</span></span><span dir="RTL"> </span><span dir="RTL"><span>افزا</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> </span><span dir="RTL"><span>داشته</span></span><span dir="RTL"> </span><span dir="RTL"><span>است</span></span><span dir="RTL">.</span></strong> https://www.jfnc.ir/article_242581_cf19cd8b7fd139adc570d505773a1d1d.pdf

انجمن احتراق ایران سوخت و احتراق 2008-3629 18 4 2025 12 31 Analysis and measurement of performance parameters of combustion by adding chamber to a double swirl burner اندازه‌گیری و تحلیل پارامترهای عملکردی احتراق با افزودن محفظه به یک مشعل دوپیچشی 243197 10.22034/jfnc.2026.564242.1452 FA علی اسدی فرد تهران، خیابان حافظ، نرسیده به خیابان انقلاب بن بست حیات پلاک 13 طبقه همکف 0009-0008-0406-1501 صادق تابع جماعت تهران، خیابان حافظ، دانشگاه صنعتی امیرکبیر دانشکده مهندسی هوافضا 0000-0003-0882-9289 عباس زندی لک دانشگاه صنعتی امیرکبیر بهراد کریمی دانشگاه صنعتی امیرکبیر Journal Article 2025 11 11 Double swirl burners are an advanced type of burner designed to improve combustion and increase flame stability. The burner used consists of two separate swirling air streams. In this paper, various experiments were performed on the burner. Subsequently, the results obtained from the experiments were repeated with a combustion chamber installed around the burner to analyze and investigate the changes that occurred. Key variables include the equivalence ratio, inner swirl number, outer swirl number, and flow split ratio. <span>Double swirl burners are a type of advanced burner designed to improve combustion and increase flame stability and efficiency. The burner used in current consists of two separate swirling air streams. Various experiments have been performed and the results obtained from the tests have been repeated in the case of installing a chamber on the burner to analyze and examine the changes that have occurred. The basic variables include the equivalence ratio, inner swirl number, outer swirl number and flow split ratio. Tests conducted in both cases without a chamber and with a chamber indicate that adding a chamber generally limits the stability of the burner and in some cases results in a longer flame length. In addition, the results show that adding a chamber in some places causes the lean blowout limit to extend to lower equivalence ratios. It is also shown that in certain conditions, increasing the outer flow split ratio leads to a shorter flame length and an increase in flame width; both effects were simultaneously observed in the flame area as well. In addition, at the points that were performed for both configuration (with and without the chamber), with a certain confinement ratio, the flame liftoff height did not change.</span> <span dir="RTL">مشعل<span>‌</span><span>ها</span></span><span dir="RTL"><span>ی</span></span><span dir="RTL"> </span><span dir="RTL"><span>دوپیچشی</span></span><span dir="RTL"><span>،</span></span><span dir="RTL"> </span><span dir="RTL">نوع</span><span dir="RTL"><span>ی</span></span><span dir="RTL"> مشعل پ</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>شرفته</span></span><span dir="RTL"> هستند که برا</span><span dir="RTL"><span>ی</span></span><span dir="RTL"> بهبود احتراق و افزا</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span></span><span dir="RTL"> پا</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>دار</span></span><span dir="RTL"><span>ی و کارایی</span></span><span dir="RTL"> شعله طراح</span><span dir="RTL"><span>ی</span></span><span dir="RTL"> شده<span>‌</span><span>اند</span><span>. </span></span><span dir="RTL"><span>مشعل استفاده </span><span>‌</span><span>شده در این پژوهش، از</span></span><span dir="RTL"> دو جر</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ان</span></span><span dir="RTL"> هوا</span><span dir="RTL"><span>ی</span></span><span dir="RTL"> پیچش</span><span dir="RTL"><span>ی مجزا </span></span><span dir="RTL">تشک</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ل</span></span><span dir="RTL"> شده</span><span dir="RTL"> </span><span dir="RTL"><span>‌</span></span><span dir="RTL"><span>‌</span><span>است</span><span>. </span></span><span dir="RTL">آزما</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span><span>‌</span><span>ها</span></span><span dir="RTL"><span>ی مختلف </span></span><span dir="RTL">بر رو</span><span dir="RTL"><span>ی </span></span><span dir="RTL"><span>این مشعل</span></span><span dir="RTL"><span>، انجام شده است، سپس نتایج </span></span><span dir="RTL">به<span>‌</span><span>دست</span><span>‌</span><span>آمده</span></span><span dir="RTL"> <span>از </span></span><span dir="RTL">آزما</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span><span>‌</span><span>ها</span></span><span dir="RTL"> <span>در حالت تعبیه محفظه روی مشعل نیز تکرار شده است تا تغییرات به وجود آمده مورد تحلیل و بررسی </span></span><span dir="RTL">قرار گ</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>رد</span></span><span dir="RTL"><span>. </span><span>متغیرهای اساسی شامل نسبت هم ارزی، عدد پیچش داخلی، عدد پیچش خارجی و نسبت تقسیم جریان است</span><span>. </span></span><span dir="RTL">آزما</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ش</span><span>‌</span><span>ها</span></span><span dir="RTL"><span>ی انجام شده در هر دو حالت بدون محفظه و با محفظه حاکی از آن است که افزودن محفظه پایداری مشعل را در حالت کلی </span></span><span dir="RTL">محدودتر</span><span dir="RTL"> <span>کرده و در بعضی موارد باعث </span></span><span dir="RTL">کش</span><span dir="RTL"><span>ی</span></span><span dir="RTL"><span>ده</span><span>‌</span><span>تر</span></span><span dir="RTL"> <span>شدن طول شعله می</span><span>‌</span><span>شود</span><span>. </span></span><span dir="RTL">ضمناً</span><span dir="RTL"> <span>ن</span></span><span dir="RTL"><span>تایج نشان می</span><span>‌</span><span>دهد</span></span><span dir="RTL"> <span>که افزودن محفظه در برخی نقاط موجب </span></span><span dir="RTL">م</span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>شود</span></span><span dir="RTL"> <span>که محدوده خاموشی رقیق به مقادیر نسبت</span><span>‌</span><span>هم</span><span>‌</span><span>ارزی کمتر توسعه پیدا کند</span><span>. </span><span>همچنین در شرایط خاصی نشان داده </span></span><span dir="RTL">م</span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>شود</span></span><span dir="RTL"> <span>که افزایش نسبت تقسیم خارجی باعث </span></span><span dir="RTL">م</span><span dir="RTL"><span>ی</span><span>‌</span></span><span dir="RTL"><span>شود</span></span><span dir="RTL"> <span>که طول شعله کمتر شود و عرض شعله افزایش می</span><span>‌</span><span>یابد و هم</span><span>‌</span><span>زمان این دو اثر در مساحت شعله نیز دیده</span><span>‌ </span><span>شده است</span><span>. </span><span>ضمنا در نقاطی که برای هر دو حالت بامحفظه و بدون محفظه انجام شد، با نسبت محصورسازی مشخص، ارتفاع بلندشدگی شعله تغییری نکرد</span><span>.</span></span> https://www.jfnc.ir/article_243197_2a30855c69a104f06d3ec40cbb0f52dd.pdf