Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 973-979   

PDF URL: http://www.ije.ir/Vol31/No6/C/15-2829.pdf  
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  EFFECTS OF TRIPLE INJECTION STRATEGIES ON PERFORMANCE AND POLLUTANT EMISSIONS OF A DI DIESEL ENGINE USING CFD SIMULATION
 
S. Hassanzadeh Saraei, S. Jafarmadar, S. Khalilarya and H. Taghavifar
 
( Received: September 24, 2017 – Accepted in Revised Form: February 19, 2018 )
 
 

Abstract    One of the main controlling parameters in diesel engine combustion is the fuel air mixing process that has direct effects on engine performance and pollutant emissions, reviewing over previous literature showed that split injection strategies could satisfy this purpose very well. For the first time and in this paper, pilot and double injection strategies were combined and formed new triple injection strategy that has not been considered by any other researchers. In this study after achieving successful validation between modeling and experimental results for both single and double injection strategies, optimization of triple injection strategy was conducted, in which first pulse of double injection strategy divided in to two pulses, then amount of injected fuel in each pulse kept constant and different delay times between first and second pulse of injections were investigated. For better understanding the processes the injections were done inside the engine, diagrams of heat release rate, in cylinder temperature, in cylinder pressure, NOx and soot emissions were presented. Results showed that decreasing the delay time between second and third pulse of injections could decrease the ratio of premixed combustion of third pulse and in optimum cases, reduction in both NOx and soot emissions could be achieved in comparition with single and double injection strategies, without any significant effects on engine performance. Furthermore, triple injection strategy with second pulse of injection that started at 4 crank angle before top dead center was selected to be the optimum case in reduction of both emissions.

 

Keywords    Diesel Engine, Triple Injection, Emissions, Performance.

 

چکیده    اختلاط سوخت و هوا یکی از پارامتر های کلیدی در احتراق موتور های دیزلی است که تاثیر مستقیمی بر آلاینده های منتشره و عملکرد موتور دارد، مروری بر کار های انجام یافته پیشین مشخص نمود که پاشش چند مرحله ای سوخت نقش مهمی در این زمینه دارد. برای اولین بار و در این مقاله با ترکیب پاشش پایلوت اینجکشن و پاشش دومرحله ای، پاشش سه مرحله ای جدیدی انتخاب گردید که تاکنون توسط محققان قبلی بررسی نگردیده بود.در این مقاله پس از اعتبار سنجی نتایج برای حالات پاشش تک مرحله ای و دو مرحله ای و اطمینان از صحت روش عددی حاضر، پاشش سه مرحله ای سوخت با ثابت نگه داشتن مقدار سوخت پاشیده شده در هر مرحله و بررسی تاثیر زمان بین مراحل پاشش سوخت مورد بررسی قرار گرفت. برای درک بهتر فرایند های اختلاط و احتراق داخل محفظه احتراق موتور، نمودار های آزاد سازی گرما ، دما و فشار داخل محفظه احتراق ، آلاینده های دوده و اکسید های نیتروژن نمایش داده شده اند. نتایج نشان دادند که کاهش زمان تاخیر پاشش سوخت بین مراحل اول و دوم پاشش سوخت، باعث کاهش احتراق پیش آمیخته در مرحله سوم پاشش سوخت می شود، همچنین در حالت بهینه، کاهش همزمان آلاینده های اکسید نیتروژن و دوده بدون تاثیر چشمگیر بر عملکرد موتور امکان پذیر است.

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