IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1472-1480    Article in Press

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H. Khatamnejad, S. Khalil Arya, S. Jafarmadar, S.M. Agha Mirsalim and M. Dahodwala
( Received: November 28, 2017 – Accepted: 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. But, the main reported drawback of mentioned strategy is partial burning and incomplete combustion as well as high amount of HC and CO exhaust emissions at part load condition. This investigation presents results from a study about conventional dual fuel combustion development by using premixed natural gas as a main fuel and early direct injection of diesel fuel as a pilot ignition fuel at engine part load condition which will be introduced as RCCI mode. After experimentally comparison between conventional diesel and NG-diesel dual fuel strategy in combustion features and exhaust emissions level, combustion analysis have been presented in conventional dual fuel and RCCI mode with specified NG substitution in test cell engine at part load. To insight into combustion properties, RCCI mode were studied via a validated CFD combustion model coupled with chemical kinetic, in compared to conventional dual fuel combustion. The results revealed that RCCI strategy led to higher combustion efficiency as well as lower HC and CO emissions compared to conventional dual fuel combustion.


Keywords    RCCI 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 بر و توان نامی موتور می­باشد. اما مهمترین مشکل گزارش شده در این راهبرد، احتراق جزیی و ناقص و در نتیجه انتشار مقادیر زیاد آلاینده های هیدروکربن نسوخته و مونواکسید کربن در بارهای پایین و جزیی موتور می­باشد. تحقیق حاضر نتایج یک مطالعه در خصوص توسعه احتراق دوگانه سوز مرسوم با بکارگیری مخلوط پیش آمیخته سوخت گاز طبیعی به عنوان سوخت اصلی و تزریق زودهنگام سوخت دیزل به عنوان سوخت آتش زنه را در بارهای پایین موتور ارائه می­نماید که تحت عنوان مفهوم احتراق واکنش پذیری پایش شده (RCCI) معرفی می­گردد. پس از مقایسه تجربی مابین حالت دیزلی مرسوم و راهبرد دوگانه سوز گاز طبیعی- دیزل در شاخصهای احتراقی و آلایندگی، تحلیل و بررسی احتراق در حالت دوگانه سوز مرسوم و RCCI با جایگزینی مقدار مشخصی از سوخت گاز طبیعی در یک موتور در اتاق آزمون و در بارهای پایین انجام می­شود. به منظور درک درست از ویژگیهای احتراق، حالت RCCI با یک مدل CFD صحه گذاری شده کوپل شده با سینتیک شیمیایی سوخت، در مقایسه با مفهوم احتراق دوگانه سوز مرسوم مطالعه می­گردد. نتایج نشان می­دهند که راهبرد RCCI منجر به بازده احتراقی بالاتر و انتشار آلاینده های هیدروکربن نسوخته و مونواکسید کربن در مقایسه با حالت دوگانه سوز مرسوم می­گردد.

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