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تحلیل عددی تأثیر نسبت سطح به حجم تاج پیستون بر آلایندگی و رفتار حرارتی موتورموتورهای اشتعال تراکمی سوخت همگن با سوخت ترکیبی متان-دیزل

نوع مقاله : مقاله پژوهشی (نظری)

نویسندگان
1 گروه مهندسی مکانیک،دانشگاه ملی مهارت،تهران،ایران
2 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران.
چکیده
هدف این مطالعه، تجزیه و تحلیل تاثیر تغییرات نسبت سطح به حجم تاج پیستون بر عملکرد و آلایندگی موتور )موتورهای اشتعال تراکمی سوخت همگن( با مخلوط سوخت متان و دیزل تحت شرایط مختلف و نمونه های 1، 2، 3، 4 با نسبت تراکم 18:1 و اعتبار بخشی قابل قبول با رفتار موتور آزمایشگاهی TD43 مورد بررسی قرار گرفته شده است. نتایج بدست آمده نشان می‌دهد که با کاهش نسبت سطح به حجم تاج پیستون، میزان دمای داخل سیلندر افزایش چشمگیری می‌یابد. تحقیقات صورت گرفته نشان می‌دهد در مدل 1 که بیشترین مقدار نسبت سطح به حجم را دارد دمای سیلندر در حدود 1800 درجه کلوین بوده در حالی که در مدل 4 که کمترین مقدار نسبت سطح به حجم را دارد، دمای داخل سیلندر در حدود 2200 درجه کلوین می‌باشد. بنابراین به ازای افزایش 7 واحدی نسبت سطح به حجم، دمای داخل سیلندر به اندازه 400 درجه کلوین افزایش می‌یابد که مقدار قابل توجهی می‌باشد. چنین اختلاف دمایی می‌تواند موجب افزایش شدید تولید آلاینده‌های خطرناک گردد. نتایج بدست آمده نشان می‌دهد که تأثیر تغییرات نسبت سطح به حجم تاج پیستون بر تولید دوده در مدل 4 که پایین‌ترین نسبت سطح به حجم را دارد، مقدار دوده تولیدی تا 50 درصد یه نسبت مدل های دیگر افزایش می‌یابد. تغییرات تولید آلاینده ناکس در هریک از موتورهای شبیه‌سازی شده را میتوان گفت که با کاهش نسبت سطح به حجم تاج پیستون تأثیر مستقیمی در افزایش تولید آلاینده ناکس در موتور را دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Analysis of the Effect of Piston Crown Surface Area to Volume Ratio on Engine Emissions and Thermal Behavior of Homogeneous Charge Compression Ignition(HCCI) Engines With Methane-Diesel Blended Fuel

نویسندگان English

sadra rostami 1
nima ahmadi 1
samad jafarmadar 2
1 Department of Mechanical engineering, National University of SKills (NUS), Tehran, Iran
2 Mechanical Engineering Department, Engineering Faculty, Urmia University, Urmia, Iran
چکیده English

The aim of this study is to analyze the effect of changes in the surface area to volume ratio of the piston crown on the performance and emissions of the HCCI engine with a mixture of methane and diesel fuel under different conditions and samples I, II, III, IV with a compression ratio of 18:1 and acceptable validation with the behavior of the TD43 laboratory engine have been investigated.

The results show that by reducing the surface area to volume ratio of the piston crown, the temperature inside the cylinder increases significantly. Research shows that in model I, which has the highest surface area to volume ratio, the temperature inside the cylinder is about 1800K, while in model IV, which has the lowest surface area to volume ratio, the temperature inside the cylinder is about 2200K. Therefore, for a 7-unit increase in the surface area to volume ratio, the temperature inside the cylinder increases by 400K, which is a significant amount. Such a temperature difference can cause a sharp increase in the production of hazardous pollutants.

The changes in the production of NOX pollutants in each of the simulated engines can be said to have a direct effect on increasing the production of NOX pollutants in the engine by reducing the surface area to volume ratio of the piston crown. It can also be stated that the production of NOX pollutants in model I is almost zero, which is a major advantage for this engine.

کلیدواژه‌ها English

HCCI compression ignition engine
homogeneous fuel
NOx
combustion process simulation
direct injection
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دوره 23، شماره 1
فنی و مهندسی
بهار 1405
صفحه 164-184

  • تاریخ دریافت 15 اردیبهشت 1404
  • تاریخ بازنگری 23 تیر 1404
  • تاریخ پذیرش 09 دی 1404