تحقیقات موتور

تحقیقات موتور

بررسی عملکرد و آلایندگی موتور ‏RCCI‏ با ترکیبات و درصدهای مختلف گاز طبیعی ‏

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه تربیت دبیرشهیدرجایی، تهران، ایران ‏
چکیده
روش RCCI در موتور دوگانه‌­سوز دیزل-گاز در این پژوهش استفاده می‌شود. بررسی مطالعات گذشته نشان می‌دهد، ترکیبات مختلف گاز طبیعی و درصد آن بر عملکرد موتورهای دوگانه­‌سوز اثر زیادی دارد. هدف این تحقیق بررسی رفتار احتراق موتور OM355 در حالت دوگانه­‌سوز (دیزل/گاز) به کمک دینامیک سیالات محاسباتی است. برای این منظور موتور دوگانه‌سوز با ترکیبات مختلف گاز CNG و درصدهای مختلف آن برای سرعت 1400 دور در دقیقه با استفاده از نرم‌‏افزار کانورج شبیه‌سازی شده‌­است. نتایج شبیه‌سازی نشان می‌دهد که ترکیبات گاز طبیعی با مقدار متان بیشتر ضمن افزایش کیفیت احتراق، مقدار هیدروکربن‌های نسوخته و آلاینده دوده را کاهش می‌دهد. همچنین در احتراق این ترکیب دمای محفظه احتراق افزایش یافته و مقدار آلاینده NOX در گازهای خروجی افزایش می‌یابد. بررسی درصدهای مختلف گاز طبیعی در موتور دوگانه­‌سوز نشان می‌دهد که با افزایش مقدار گاز طبیعی تا 70 درصد، مقدار بیشینه دمای داخل محفظه احتراق کاهش و در بیشتر از این مقدار افزایش می‌یابد. لذا آلاینده NOX برای نسبت‌های تا 70 درصد، نسبت به موتور دیزلی تا 75 درصد کاهش و با افزایش بیشتر مقدار گاز طبیعی به دلیل بالارفتن دمای محفظه احتراق مقدار آلاینده NOX افزایش می‌یابد.
کلیدواژه‌ها

عنوان مقاله English

Investigating the performance and emission of RCCI engines with different compositions ‎and percentages of natural gas

نویسندگان English

Ali Mirmohammadi
Ahmadreza Kargarian Marvasti
Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
چکیده English

The RCCI method is used in dual-fuel diesel-gas engines in this study. Previous studies have shown that different natural gas compounds and their percentages have a significant effect on the performance of dual-fuel engines. This research aims to investigate the combustion behavior of the OM-355 engine in dual-fuel (diesel/gas) mode using computational fluid dynamics. For this purpose, the dual-fuel engine is simulated using CONVERGE software. The simulation was performed at 1400 rpm, and different combinations of CNG gas and their various percentages and the output parameters of engine performance and pollution were studied. The simulation results show that natural gas compounds with a higher methane content increase the combustion quality and reduce unburned hydrocarbons and smoke pollutants. Additionally, in the combustion of this mixture, the temperature inside the combustion chamber increases, and the amount of NOX pollutants in the exhaust gases increases. The investigation of different percentages of natural gas in the dual-fuel engine shows that an increase in the amount of natural gas until 70% reduces the maximum temperature inside the combustion chamber, and beyond this amount, it increases. Therefore, for natural gas ratios up to 70%, the NOX pollutant is reduced by 75% compared to a diesel engine, and with further increases in the amount of natural gas, the NOX pollutant increases due to the rise in the temperature of the combustion chamber.

کلیدواژه‌ها English

Converge
Internal Combustion Engine
Natural Gas
Emissions
Soot
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