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| Numerical Simulation of Effects of Injection Strategy on Combustion and Soot Formation Process of Gasoline Compression Ignition |
| DOI：10.13949/j.cnki.nrjgc.2020.02.003 |
| Key Words:gasoline compression ignition soot emissions port fuel injection direct injection numerical simulation |
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| Abstract:Based on the three-dimensional computational fluid dynamics(CFD) software CONVERGE, a computational model of gasoline compression ignition(GCI) was established by coupling reduced toluene reference fuel(TRF) chemical kinetic mechanism with a phenomenological soot model. With various port fuel injection(PFI) ratios, main injection timings and pilot-main injection intervals of direct injection(DI), the effects of the injection strategy combining PFI with DI on the combustion and soot formation processes of GCI at high load conditions were studied. The results show that higher PFI ratio, earlier main injection timing and greater pilot-main injection interval can shorten the combustion duration and increase the concentrated combustion, resulting in less soot. Besides, the PFI ratio has a great influence on soot nucleation and surface growth, and earlier main injection timing can increase the oxidation rate. With the PFI ratio of 40%, main injection timing at 8° in crank angle before the top dead center and pilot main injection interval of 15°, the soot is 0.0151 g/(kW·h), which is 33.8% lower than the baseline experimental condition, and the maximum pressure rise rate is also controlled within an acceptable range. |
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