بهینه سازی نسبت EGR، نسبت سوخت بیودیزل و شرایط کاری یک موتور دیزل با روش RSM

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس، گروه مکانیک بیوسیستم

2 دانشگاه تربیت مدرس

چکیده

در این پژوهش تاثیر بار و سرعت موتور و همچنین نسبت EGR و نسبت سوخت بیودیزل بر متغیرهای عملکردی و آلاینده‌‌های یک موتور دیزل تک سیلندر چهار زمانه بررسی گردید. همچنین با استفاده از روش بهینه سازی سطح پاسخ (RSM)، عوامل در نظر گرفته شده، بهینه سازی گردید. با استفاده از سامانه EGR، آلاینده 〖"NO" 〗_"x" کاهش یافت به گونه‌‌ای که بالاترین مقدار کاهش آلاینده 〖"NO" 〗_"x" برابر با 7/63 درصد و برای سوخت B10 و نسبت 30 درصد EGR بوده است. استفاده همزمان از سامانه EGR و سوخت بیودیزل موجب کاهش آلاینده CO به ترتیب برابر با 04/4، 12 و 73/1 درصد برای دورهای موتور 1800، 2100 و 2400 دور بر دقیقه گردید. بالاترین میزان کاهش آلاینده UHC برابر با 05/54 درصد بوده است و بدین ترتیب افزایش، از این رو آلاینده به دلیل استفاده از سامانه EGR تا حدود زیادی کنترل شد. نقطه بهینه شده توسط روش بهینه سازی RSM بدین صورت بود که اگر موتور در بار 3/45 درصد، دور موتور rpm 2080 کار کند، برای داشتن حداکثر کارایی و حداقل آلایندگی باید نسبت EGR 97/14 درصد و مقدار بیودیزل مخلوط شده با سوخت دیزل برابر با 43/5 درصد باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Optimization of the EGR rate, biodiesel fuel ratio and engine working mode by RSM method

نویسندگان [English]

  • Farzad Jaliliantabar 1
  • gholamhassan najafi 2
1 Tarbiat modares university
2 Tarbiat modares university
چکیده [English]

In this research work effect of the different engine loads, engine speeds, EGR rates and biodiesel ratio in biodiesel diesel fuel blend on the emissions and performance parameters of a 4stroke single cylinder diesel engine have been investigated. The RSM method has been used to optimize the EGR rate, biodiesel percent and engine working mode. The highest decrease in NO_xemissions while using the biodiesel and EGR has been 63.76% with B10 fuel blend and 30% EGR rate. The simultaneous usage of EGR and biodiesel reduced CO emission of the engine by 4.04, 12 and 1.73% for low, medium and high engine speed. The biodiesel was decreased the HC emission of the engine and so it compensated the increase of HC due to EGR. The highest reduction in HC emission levels while using EGR and biodiesel simultaneously, has been 54.05%. It is noticeable that the total amount of the smoke emission levels while using EGR and biodiesel did not change considerably. The optimized condition proposed by the RSM method has been 45.3% engine load, 2080 rpm engine speed, 14.97 % EGR rate and 5.43% biodiesel blend with diesel fuel.

کلیدواژه‌ها [English]

  • Emission
  • Biodiesel
  • optimization
  • EGR and RSM
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