معرفی یک محفظه احتراق مارپیچ-کانالی جدید و بررسی تجربی اثر رقیق‌ساز نیتروژن بر شعله غیر پیشآمیخته میکرو متان- اکسیژن به کمک روش طیف‌سنجی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)

چکیده

در پژوهش حاضر، به بررسی تجربی احتراق، اکسیژن- متان با بررسی اثر رقیق‌سازی نیتروژن درون محفظه‌های کانالی تخت همراه با بازیابی انرژی حرارتی ناشی از دمای گازهای حاصل از احتراق پرداخته‌شده است و احتراق غیر پیش آمیخته متان- اکسیژن با نسبت هم‌ارزی ثابت 69/1 با درصدهای رقیق‌سازی نیتروژن 0%، 5%، 10% و 18% به کمک روش طیف‌سنجی مورد بررسی قرار گرفته است، برای این تحقیق از یک محفظه جدید طراحی و ساخته‌شده از جنس آلومینیوم استفاده شده است، این محفظه بر اساس طراحی مارپیچی-کانالی جهت کمک به بازیابی حرارتی طراحی شده است. در این محفظه جهت پیش گرم کردن گازهای ورودی، گازهای حاصل از احتراق پس از طی یک مسیر موازی با جریان ورودی باعث پیش گرم شدن گازهای ورودی می‌شوند. همچنین اکسیژن قبل از قسمت ورودی به محفظه توسط نیتروژن رقیق و مخلوط شده و سپس وارد محفظه می‌شود. بر اساس نتایج حاصل از این تحقیق با افزایش نسبت رقیق‌ساز، کاهش طیف تابشی رادیکال  که نمایانگر کامل‌تر بودن احتراق است مشاهده‌ شده است. به‌طورکلی با افزایش نسبت رقیق‌سازی افزایش طول شعله مشاهده می‌شود و در حالت رقیق‌سازی 5 و 10 درصد بهترین حالت یکنواختی توزیع دمایی و طول مناسب شعله مشاهده می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Introducing a novel spiral-channel combustion chamber and experimentally investigating the effect of nitrogen dilution on non-premixed micro methane-oxygen flame by spectroscopy method

نویسندگان [English]

  • Soroush Sarrafan Sadeghi
  • Sadegh Tabejamaat
  • Amirreza Ghahremani
  • Sina Narimani Asl
Department of Aerospace Engineering, Amirkabir University of Technology (Tehran Polytechnic)
چکیده [English]

In this study, the experimental investigation of oxygen-methane combustion has been done by investigating the effect of nitrogen dilution in a novel spiral-channel combustion chamber along with the recovery of thermal energy of the products.  The methane-oxygen non-premixed flame by a fixed equivalence ratio of 1.69, with nitrogen dilution percentages of 0%, 5%, 10%, and 18%, has been investigated with the spectroscopy method. The chamber is made of aluminum and created as a spiral-form channel to aid heat recovery. In this chamber, the combustion gases then pass a path parallel to the inlet flow, causing the inlet gases to be preheated. Also, oxygen is diluted and mixed with nitrogen before entering the chamber. Based on the results, by increasing of the diluent ratio the reduction of the H2O* radical radiation spectrum has been observed, where indicates complete combustion. In general, with the increase of the dilution ratio, the flame length increases, and in 5% and 10% dilution states, the best temperature distribution uniformity, and the completion of the combustion reaction chain are observed.

کلیدواژه‌ها [English]

  • Methane-Oxygen Flame
  • Nitrogen dilution
  • Meso-scale helical-channel combustion chambers
  • Non-Premixed Combustion
  • Flame Spectroscopy Method
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