The goal of this study was to demonstrate and explain the combustion characteristics of gasoline EN91 in a spark ignition engine with different ignition timing. The kiva4 code was used to calculate the combustion characteristics of gasoline under various ignition timing conditions. The numerical results obtained in kiva4 were compared to the numerical results obtained by other researchers who used the simulation code kiva3vr2. To accomplish this, two cases were investigated: a complete engine cycle was successfully simulated using a four valve pent – roof engine, and experimental results from other researchers were compared. ranging from 40 BTDC to 180 BTDC The temperature and pressure combustion characteristics in kiva4 and kiva3vr2 have a 10% error. The peak and average temperature and pressure from the Kiva4 code and measured experimental results show a qualitative closeness with a percentage error of 4%. The average temperature and pressure in kiva4 were 640K and 16.48 bar, respectively, while in kiva3vr2 they were 600K and 14.83 bar. The peak temperature and pressure in kiva4 were 2316.3K and 21.5 bar, respectively, while in kiva3vr2 they were 2171.5K and 19.4 bar. At 40 BTDC, the peak temperature and pressure in kiva4 were 2075.7K and 20.37 bar, respectively, while at 180 BTDC, they were 2166.0K with a pressure of 23.47bar. With increasing spark advance, the peak temperature and pressure rise until the most favorable instant time is found. The best results were obtained when the ignition time was set to 10 degrees before top dead center.
Author (S) Details
Joseph Lungu
Mechanical Department, Copperbelt University, Kitwe, Zambia.
Lennox Siwale
Mechanical Department, Copperbelt University, Kitwe, Zambia.
Edwin Luwaya
Mechanical Department, University of Zambia, Lusaka, Zambia.
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