بررسی پاسخ کد شبیه‌ساز چند منطقه‌ای مجهز به زیرمدل نشتی در موتور اشتعال جرقه‌ای ترکیب‌سوز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای مکانیک دانشگاه محقق اردبیلی

2 محقق اردبیلی-فنی و مهندسی- مهندسی مکانیک

چکیده

در کار حاضر از موتور تک سیلندر پژوهشی، نتایج تجربی سیکل‌های با مد پرش جرقه در نسبت تراکم 9 و سرعت rpm1800 برای ترکیب‌های100%، 90%، 75% و 60% بنزین و مابقی گازطبیعی در نسبت هم‌ارزی استوکیومتری استخراج گردید. سپس یک کد شبیه‌ساز ورودی ترمودینامیکی چندمنطقه‌ای ترکیب‌سوز بنزین-گازطبیعی با زیر مدل نشتی توسعه داده شد. از نتایج تجربی با پرش جرقه، دو مجموعه 200 سیکلی موتورگردانی و احتراقی برای اهداف تایید کد فراهم گردید. در حالت موتورگردانی نتایج کد شبیه‌ساز با نشتی با میانگین داده‌های فشار-زاویه میل‌لنگ مجموعه موتورگردانی مقایسه شد و زیر مدل نشتی کد شبیه‌ساز تایید گردید. سپس در حالت احتراقی نیز نتایج کد شبیه‌ساز با میانگین داده‌های فشار-زاویه میل‌لنگ مجموعه احتراقی برای هر ترکیب بررسی و با خطای کمتر از 4% تایید شد. در حالت احتراقی جرم نشتی به شکاف‌ها قابل‌توجه‌تر از حالت موتورگردانی برآورد شد و با توجه به اینکه انحراف نتایج کد بدون نشتی با نتایج تجربی در مقایسه با انحراف نتایج کد با نشتی در حالت موتورگردانی انحراف جدی داشت، اعمال زیر مدل نشتی در کد شبیه‌ساز از اهمیت ویژه‌ای برخوردار است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the response of a multi-zone simulation code equipped with blow-by sub-model in a dual fuel spark-ignition engine

نویسندگان [English]

  • Mehrdad Sarabi 1
  • Ebrahim Abdi Aghdam 2
1 PhD Student, Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili
2 Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh
چکیده [English]

In the present study, a single-cylinder research engine was utilized to capture experimental data at 9 compression ratio and 1800 rpm engine speed for dual fuel mixtures of 100%, 90%, 75% and 60% gasoline and the rest natural gas in skip-fire mode. Then, a gasoline- natural gas multi-zone thermodynamic entrainment simulation-code equipped with blow-by sub-model was developed. Two 200-cycle sets of free residual motoring and firing cycles were separated from the experimental data to check the response of the code. In motoring-case, the ensemble-average P-θ of the motoring set was compared with that of the code and the blow-by sub-model was verified. Next, in the firing-case, the results obtained from the code were compared with the ensemble-average P-θ of the firing set in each fuel combination and the code was validated. In the firing-case, the leakage to crevices was estimated to be considerably more than that of the motoring-case. In the firing mode of the code, the deviation of the obtained results of the code without blow-by option from the experimental results was more serious as compared to those of the code with blow-by, emphasizing the importance of the blow-by sub-model in the code.

کلیدواژه‌ها [English]

  • Multi-Zone model
  • blow-by
  • Gasoline-natural sas
  • Dual Fuel
  • Spark-ignition engine
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