Experimental Study and Comparison of a Few Lean (gasoline-natural gas) Dual ‎F‎uels Based on Safe Optimum Spark Advance

محورهای موضوعی : مجله بین المللی ریاضیات صنعتی

S. K. Yekani ¹ , E. Abdi ‎Aghdam‎ ² , M. Sarabi ³

1 - Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
2 - Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
3 - Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

تاریخ دریافت : 1398/11/08 تاریخ پذیرش : 1398/11/08 تاریخ انتشار : 1401/04/10

کلید واژه: Lean-‎burn‎, Dual fuel SI engine, Gasoline, Optimum Spark Advance, Emissions, Natural gas,

چکیده مقاله :

Strong dependence of the human’s daily life on the engine-powered vehicles, increasing environmental pollutions, especially in urban areas, and reduction of the world oil resources have challenged the energy researchers to make appropriate decisions at regional scale for selecting alternative fuels to improve the engine efficiency and fuel economy. In the current work, the lean-burn idea jointed to dual (gasoline-NG) fuel has been considered to develop the SI engines. To investigate the performance and exhaust gas emissions, experimental tests were performed using a single-cylinder research engine with gasoline-NG dual fuels, including four mass-based blends of the two fuels (G100, G87.5, G75, and G62.5 containing gasoline at 100‎\‎%, 87.5\%, 75\%, and 62.5\%, respectively, with the remaining part being composed of NG), at 1800 rpm ES and 0.9 ER under at least seven different SAs. The result showed that increasing the NG fraction in the fuel blend, both the σ and COV of imep decreased. It was implicitly observed that, for blended fuels, non-uniform distribution of each fuel can serve as a new source for cyclic variations. Under the considered lean burning condition at optimal safe SA, the imep and output torque for the gas-contained fuel blends were comparable to those obtained by the pure gasoline. Also, it was detected that an increase in the CR reduced the emitted amounts of HC and CO ‎pollutants.‎

چکیده انگلیسی:

وابستگی جدی زندگی روزمره‌ی به خودروهای موتوری، افزایش آلودگی محیط زیست بالاخص در مناطق شهری و تقلیل منابع نفتی جهان، چالش‌هایی را برای اتخاذ تصمیمات مناسب بمنظور بهبود بازده، کاهش آلاینده‌ها، اقتصاد سوخت و انتخاب سوخت‌های جایگزین بوجود آورده است. در کار حاضر ایده‌ی فقیرسوزی بهمراه بهره‌گیری از حالت سوخت ترکیبی بنزین - گاز طبیعی بعنوان بهبود در توسعه‌ی موتورهای اشتعال جرقه‌ای درنظر گرفته شده است. بطور تجربی عملکرد و آلایندگی یک موتور پژوهشی تک‌سیلندر با استفاده از چهار ترکیب مختلف بنزین-گاز طبیعی (با سوخت غالب بنزین) بر پایه­ی جرمی شامل 100%، 5/87%، 75% و 5/62%  بنزین و مابقی گاز طبیعی (نامگذاری شده بصورت G100، G87.5، G75 و G62.5 مورد بررسی قرار گرفته است. مطالعه در محدوده‌ی شرایط غیرکوبشی تحت شرایط فقیر با نسبت هم‌ارزی 9/0 و سرعت rpm 1800 در حداقل هفت آوانس جرقه دنبال شده است. از تحلیل تغییرات فشار درون­سیلندری ملاحظه شد که با افزایش درصد حضور گازطبیعی در ترکیب، مقادیر انحراف معیار و ضریب تغییرات، COV، کاهش یافتند. به طور ضمنی مشاهده شد که ، برای سوخت های ترکیبی، توزیع غیر یکنواخت هر سوخت می تواند به عنوان منبع جدیدی برای تغییرات سیکلی باشد. در شرایط فقیرسوزی در نظر گرفته شده در آوانس بهینه امن، گشتاور خروجی و imep برای مخلوط های سوخت حاوی گازطبیعی قابل مقایسه با بنزین خالص است. 

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