نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی امیرکبیر
2 دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران
3 دانشگاه صنعتی امیر کبیر
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The use of natural gas-biodiesel in LTC engines, according to their characteristics, Recently, it has attracted the attention of combustion scientific circles. Natural gas abundance, clean combustion characteristics and relatively low cost among various fuels and renewability of biodiesel make them attractive fuel in combustion engines. In this line, various experimental tests using natural gas-biodiesel fuels was performed until now. So for further development ,use of numerical simulations can be effective. The main problem in this way is the lack of a precise combustion mechanism of biodiesel-natural gas. In this regard, an accurate mechanism which is consist of 153 species and 727 reactions is developed from two up-to-date mechanisms. For natural gas, Drost mechanism ,which is consist of 49 species and 332 reactions and considered as 90% CH4, 9% C2H6 and 1% C3H8 and for biodiesel, Zhang mechanism with 156 species and 589 reactions has been employed, which is considered as 25% MD, 25% MD9D and 50% n-Heptane. In development process, DRG, DRGEP, sensitivity analysis, path flux analysis and QSSA methods is used. Comparing ignition delay times of based and developed mechanisms revealed that arithmetical mean error (AME) is 10.77% for 0%-NG and 11.2% for 0%-biodiesel, respectively. In 1-D simulation, flame speed is calculated and the AME for 0%-biodiesel and 0%-NG is 7% and 8.3%, respectively. At the end , RCCI engine CFD simulation is verified again the develop mechanism appropriately.
کلیدواژهها [English]
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