IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1082-1087    Article in Press

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H. Khatamnejad, S. Khalilarya, S. Jafarmadar, M. Mirsalim and M. Dahodwala
( Received: November 28, 2017 – Accepted in Revised Form: March 09, 2018 )

Abstract    Natural gas-diesel dual fuel combustion is a beneficial strategy for achieving high efficient and low emissions operation in compression ignition engines, especially in genset application heavy duty diesel engine at rated power. This study aims to investigate a dual fuel engine performance and emissions using premixed natural gas and early direct injection of diesel fuel. Due to the different reactivities of natural gas and diesel fuels, the mentioned dual fuel combustion is based on reactivity controlled compression igniton (RCCI) which is introduced whitin the cylinder. A six-cylinder direct injection (DI) diesel engine was properly modified to run on dual-fuel mode. Based on experimental study, comparative results are given for various operating modes; conventional diesel mode, convential dual-fuel mode, and RCCI mode; revealing the effect of combustion mode on performance and emission characteristics in a compression ignition engine. The results show that the conventional dual fuel combustion reduces nitrogen oxides (NOx) emissions but suffers from higher carbon monoxide (CO) and unburned hydrocarbon (HC) emissions in compared to conventional diesel mode at part load condition. Results of detailed assessment of different dual fuel modes with CFD model coupled with chemical kinetic mechanism reaveled that RCCI strategy led to higher combustion efficiency as well as lower HC and CO emissions compared to conventional dual fuel combustion at part load condition.


Keywords    Reactivity Controlled Compression Igniton Combustion; Natural Gas; Diesel; CFD Simulation Coupled with Chemical Kinetic


چکیده    احتراق دوگانه سوز گاز طبیعی- دیزل راهبرد موثری در جهت دستیابی به عملکرد با بازده بالا و آلایندگی پایین در موتورهای اشتعال تراکمی، بویژه در کاربری سنگین نیروگاهی در بار و توان نامی موتور می­باشد. هدف از تحقیق حاضر، بررسی عملکرد و آلایندگی یک موتور دوگانه سوز مرسوم با بکارگیری مخلوط پیش آمیخته سوخت گاز طبیعی و تزریق زودهنگام سوخت دیزل است. بدلیل واکنش پذیریهای متفاوت سوخت گاز طبیعی و دیزل، احتراق دوگانه سوز ذکر شده برپایه اشتعال تراکمی با واکنش پذیری کنترل شده در داخل سیلندر است که تحت عنوان RCCI معرفی می­گردد. به این منظور، یک موتور شش سیلندر تزریق مستقیم جهت بررسی عملکرد در حالت دوگانه سوز آماده سازی شده است. برپایه مطالعه تجربی، نتایج مقایسه­ای برای حالات مختلف عملکردی شامل دیزلی مرسوم، دوگانه سوز مرسوم و RCCI ارائه شده است که نشان دهنده تاثیر نوع احتراقهای مذکور بر عملکرد و آلایندگی در یک موتور اشتعال تراکمی می­باشند. نتایج نشان می­دهند که احتراق دوگانه سوز مرسوم میزان انتشار آلاینده اکسیدهای ازت را در مقایسه با احتراق دیزلی مرسوم در بارهای پایین موتور کاهش داده، اما منجر به تولید مقادیر زیاد آلاینده­های مونواکسید کربن و هیدروکربنهای نسوخته می­گردد. نتایج ارزیابی حالات مختلف احتراق دوگانه سوز به همراه یک مدل CFD کوپل شده با مکانیزم سینتیک شیمیایی نشان می­دهد که راهبرد RCCI منجر به بازده احتراقی بالاتر و انتشار هیدروکربن نسوخته و مونواکسید کربن کمتر در مقایسه با حالت دوگانه سوز مرسوم در بارهای پایین می­گردد.


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