An Experimental Analysis of the Knock Response of Different Stoichiometric Mixtures of Gasoline-Natural Gas to Various Engine Speeds
محورهای موضوعی : مجله بین المللی ریاضیات صنعتی
R. Behrad
1
(Faculty of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran)
E. Abdi Aghdam
2
(Faculty of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.)
Hadi Ghaebi
3
(Faculty of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.)
کلید واژه: Natural gas, knock, dual fuel, Gasoline, spark ignition engine,
چکیده مقاله :
Gasoline causes engine knock in higher compression ratios due to having lower spontaneous ignition temperature. Natural Gas (NG) has a higher octane number and is a proper fuel in terms of anti-knock properties; however, using it as the engine fuel results in a decline in the power of the engine and increases the emission of some exhaust gases due to lower burning velocity and gaseous nature.
بنزین به دلیل داشتن دمای اشتعال خودبهخودی پایینتر باعث کوبش موتور در نسبت تراکم بالاتر میشود. گاز طبیعی (NG) عدد اکتان بالاتری دارد و از نظر خواص ضدکوبشی سوخت مناسبی است. با این حال، استفاده از آن به عنوان سوخت موتور منجر به افزایش انتشار برخی از گازهای آلایندهی خروجی و کاهش قدرت موتور می شود که دلیل آن کاهش سرعت سوختن و طبیعت گازی سوخت است. استفاده از مخلوط بنزین و NG با سوخت غالب بنزین میتواند کاهش قدرت موتور را جبران کرده و از وقوع کوبش موتور جلوگیری کند. با در نظر گرفتن این موضوع، در مطالعه حاضر، 4 ترکیب مختلف بنزین و NG شامل 100%، 90%، 80% و 70% بنزین و مابقی NG (به ترتیب GA100، GA90، GA80 و GA70) با استفاده از یک موتور تحقیقاتی SI تک سیلندر با نسبت همارزی 1.0، نسبت تراکم 11، و سرعت موتور 1500، 1800 و 2100 دور در دقیقه به صورت تجربی مورد بررسی قرار گرفت.
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