تحقیقات موتور

تحقیقات موتور

مطالعة تجربی سوخت زیست‏‌دیزل روغن پسماند در موتوری ‏RCCI، برای ارزیابی اثرات لحظة شروع پاشش ‏سوخت با واکنش‌پذیری شدید

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
افزایش آلایندگی در کنار تشدید گرمایش زمین و کاهش شدید منابع انرژی سنگواره‌‏ای، سه محور اصلی پرخطر برای زندگی انسان‌ها و کرة زمین هستند. این موارد پژوهشگران را به سمت استفاده از سوخت‌های تجدیدپذیر جایگزینی که در بیشتر نقاط جهان یافت شوند و آلایندگی کمتری داشته باشند، انگیزه داده است. زیست‌‏دیزل حاصل از روغن پسماند تقریباً تمام خواص ذکر شده را دارد. با توجه به هدف‌گذاری‌های روند توسعة پایدار در افزایش استفاده از زیست‌‏دیزل، بررسی عملکرد این سوخت‌ در موتورهای آینده نظیر موتورهای اشتعال تراکمی با واکنش‏‌پذیری تنظیم شده، بسیار مهم است. شاخص زاویة شروع پاشش سوخت در موتورهای RCCI برای یافتن بازه‌های عملکردی مناسب و بهینه‌یابی مقدار انتشار آلاینده‌ها حائز اهمیت است. این درحالی است که تأثیر لحظة پاشش سوخت مستقیم در احتراق RCCI بنزین/ زیست‏‌دیزل، به روش تجربی توسط محققین بررسی نشده است. در این پژوهش تغییرات زمان پاشش سوخت ستان بالای زیست‏‌دیزل روغن پسماند در یک موتور RCCI با سوخت اکتان بالای بنزین به صورت تجربی بررسی شد. داده‌های فشار داخل استوانه، عملکرد موتور و میزان انتشار آلاینده‌های NOx، UHC و CO از آزمون‌ها استخراج و تحلیل شدند. نتایج نشان داد که تغییرات SOI در بازة عملکرد کاملاً پایدار موتور می‌تواند حدود 9.2% در بازده حرارتی ترمزی، زمانی که موتور در حالت RCCI با نسبت سوخت پیش‌آمیخته 27% کار می‌کند، تغییر ایجاد کند. همچنین پاشش در زاویة CAD bTDC 30 توانست در کنار حفظ مقادیر قویتری توان ترمزی، مقدار NOx کمتری از دیگر زوایای پاشش داشته باشد.
کلیدواژه‌ها

عنوان مقاله English

Experimental investigation of injection timing effect on RCCI Engine using waste oil biodiesel as high reactive fuel

نویسندگان English

Ashkan Ghaedi
Omid Jahanian
Rouzbeh Shafaghat
Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده English

Three major threats that endanger human life and the planet are the escalating pollution levels, the intensifying global warming, and the rapid depletion of fossil fuel resources. These challenges have prompted researchers to explore the use of alternative fuels that are widely available, renewable, and have lower pollution emissions. Biodiesel obtained from waste oil has almost all these characteristics. Considering the objectives of the sustainable development goals in increasing the use of biodiesel in the future, it is essential to investigate the performance of this fuel in next-generation internal combustion engines such as reactivity-controlled compression ignition (RCCI) engines. The start of injection (SOI) parameter in RCCI engines is important to find suitable performance intervals and optimize the emission of these engines; however, the effect of this parameter has not been investigated in experimental studies of RCCI gasoline/biodiesel combustion. Consequently, the changes in the injection timing of waste oil biodiesel (combined with diesel), as a high-cetane fuel and high-octane gasoline fuel, in an RCCI engine were investigated experimentally in this research. The results indicated that SOI changes in the completely steady operation range of the engine can cause a change of around 9.2% in brake thermal efficiency when the engine operates in RCCI mode with a premixed fuel ratio of 27%. Also, it was found that the SOI timing of 30°bTDC can lead to a lower level of NOx emission than the other injection angles while maintaining relatively higher values of brake power.

کلیدواژه‌ها English

Biodiesel
Waste Oil
RCCI Engine
Start of Injection (SOI) Timing
Emission
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دوره 71، شماره 4 - شماره پیاپی 77
مقالات انگلیسی
زمستان 1403
صفحه 44-57

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