تعیین تجربی رژیم احتراقی مخلوط همگن در یک موتور اشتعال تراکمی

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشگاه صنعتی نوشیروانی بابل

چکیده

احتراق اشتعال تراکمی بار همگن، مفهوم احتراقی مفیدی از نظر بازدهی و میزان آلاینده‌ها برای موتورهای درون‌سوز است. لیکن بازة کارکردی محدود این راهبرد احتراقی سبب شده است که استفاده کاربردی از آن در موتورها تاکنون موفق نبوده باشد. یکی از روش‌های کاربردی نمودن آن در موتورها این است که با دیگر انواع احتراق مشابه، همچون احتراق دیزلی و احتراق پیش‌آمیخته جزئی ترکیب گردد و هر راهبرد در بازة کارکردی بهینة خود ایفای نقش نماید.در این مطالعه با بررسی مشخصات عملکردی و آلایندگی حاصل از نتایج آزمون بر روی یک موتور، شرایط گذر از رژیم احتراق پیش‌آمیخته جزئی به احتراق اشتعال تراکمی مخلوط همگن بازتعریف می‌گردد. اساس این شناسایی بر این اصل استوار است که در شرایط اشتعال تراکمی مخلوط همگن با پاشش مستقیم سوخت به درون محفظه احتراق، چینه‌بندی حاصل از زمانبندی سوخت‌پاشی، پارامتری با اثرگذاری چشمگیر نیست. نتایج نشان می‌دهند که در شرایطی که پاشش سوخت بسیار زود اتفاق می‌افتد (تکمیل کل فرآیند سوخت‌پاشی پیش از 60 درجة زاویة لنگ قبل از نقطة مرگ بالا) رژیم احتراقی حاصله اشتعال تراکمی مخلوط همگن است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental determination of direct injection homogeneous charge compression ignition (DI-HCCI) combustion regime

نویسندگان [English]

  • Morteza Fathi
  • Davoud Domiri Ganji
Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

Homogeneous charge compression ignition (HCCI) is an advantageous combustion concept for internal combustion engines in terms of efficiency and pollutant emissions. However, the limited operating range of this combustion concept suppressed its successful utilization. One applicable method to use this combustion concept in engines is to combine it with other similar combustion strategies, such as diesel and partially premixed combustion (PPC), while each combustion concept come into work during its optimum operating range. In this study, the transition from partially premixed combustion (PPC) to homogeneous charge compression ignition (HCCI) combustion is determined based on investigating the performance and emission characteristics obtained from experimental data. The determination is based on the fact that in the direct-injection (DI) HCCI combustion, the stratification generated from the fuel injection is not an influencing factor. The results reveal that in the case of very early fuel injection timing (when the whole injection is completed before 60 crank angle degrees to top dead center) the HCCI combustion regime is obtained.

کلیدواژه‌ها [English]

  • Homogeneous charge compression ignition (HCCI) engine
  • fuel injection
  • partially premixed combustion (PPC)
  • charge stratification
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