تأثیر زمان آغاز پاشش بنزین روی تغییرات سیکلی، آلاینده‌های HC و CO در حالت نیم بار ترکیب سوز بنزین- گاز طبیعی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشجو دکترا در دانشگاه محقق اردبیلی

3 دانشجوی کارشناسی ارشد مکانیک دانشگاه محقق اردبیلی

چکیده

سیستم سوخت‌رسانی و اختلاط مناسب سوخت و هوا از چالش‌های مهم در موتورهای اشتعال جرقه‌ای است. به دلیل اتمیزه شدن سوخت پاششی توسط انژکتور، تعیین بهترین موقعیت آغاز پاشش سوخت نقش مهمی را روی عملکرد موتور دارد. در پژوهش حاضر از یک موتور تک سیلندر پژوهشی با قابلیت تنظیم زمان­بندی جرقه، موقعیت آغاز پاشش و طول پاشش سوخت که به سیستم­ های سوخت ­رسانی پاشش راه­گاهی بنزین و گاز طبیعی مجهز شده، در سرعت 1800 دور بر دقیقه و نسبت تراکم 11 استفاده شد. در حالت نیم ­بار، طول پاشش سوخت ­ها و نسبت جرمی آنها و سرعت موتور ثابت نگه­ داشته شد و زاویه آغاز پاشش با گام º45 میل­لنگ در اثنای چرخه موتور تغییر داده شد. به ازای هر تنظیم زاویه­ ی آغاز پاشش سوخت فشار سیلندر 400 چرخه متوالی و آلاینده­ های HC و CO در حالت نیم بار ترکیب سوز داده‌برداری شد. نتایج حاصله نشان می­دهد که با حفظ طول پاشش سوخت­ها مقدار آلاینده ­های خروجی با تغییر زاویه­ ی آغاز پاشش هر سوخت تغییر می ­کند و تغییرات آلاینده ­ها در حالت تغییر زاویه­ ی آغاز پاشش بنزین نسبت به سوخت گاز طبیعی بیشتر است، همچنین آوانس بهینه­ ی جرقه در حالت تمام بار نسبت به نیم بار تفاوت 9 درجه ­ای را نشان می ­دهد. همچنین از تغییرات انحراف معیار و ضریب تغییرات (COV) فشار موثر متوسط اندیکه (imep) ملاحظه شد که بیشترین مقدار آن‌ها وقتی است که زمان آغاز پاشش بنزین در °15 میل­لنگ بعد از نقطه مرگ بالای تنفسی باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of start timing of gasoline injection on cyclic variations,, HC and CO pollutants in part load of dual fuel gasoline-natural gas mode

نویسندگان [English]

  • Ebrahim Abdi Aghdam 1
  • Majid Ataie 2
  • Hosein Kamali Gollo 3
1 Faculty of Engineering, University of Mohaghegh Ardabili, Iran
2 PhD student in University of Mohaghegh Ardabili
3 MSc student in University of Mohaghegh Ardabili
چکیده [English]

Fuel system and proper fuel-air mixing are important challenges in spark ignition engines. Due to time consuming fuel atomization process, determining the best start position for fuel injection is vital in engine performance. In the present work, a single-cylinder research engine equipped with a fuel injection system for gasoline and natural gas, with the ability to adjust spark timing and start of injection positions was used at 1800 RPM and a compression ratio of 11. At a fixed fuel ratio of dual mode, the result showed 9o crank-angle difference between optimum spark advanced of full-load and half-load. At half-load fuel injection period, fuel mass fractions and engine speed were fixed and crank-angle position of start of injection (SOI) was varied along a cycle by a 45o crank-angle step. For each adjusted fuel SOI position, in-cylinder pressure of 400 successive cycles and related HC and CO emissions were collected. The obtained results showed that the emissions were changed by varying SOI position of each fuel fixing fuel injection periods. The emitted gas changes were significant for gasoline SOI variation in compared with those of natural gas. Also, from changes of standard deviation and coefficient of variation of indicated mean effective pressure, it was observed that their highest values occur when gasoline SOI is 15o crank-angle after induction top center.

کلیدواژه‌ها [English]

  • Spark ignition engine
  • Fuel injection timing
  • Gasoline
  • Natural gas
  • Dual-fuel mixture

مراجع

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سوخت و احتراق
دوره 15، شماره 1 - شماره پیاپی 38
اردیبهشت 1401
صفحه 71-85

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سابقه مقاله

  • تاریخ دریافت: 07 فروردین 1401
  • تاریخ بازنگری: 19 اردیبهشت 1401
  • تاریخ پذیرش: 07 خرداد 1401

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