Abstract：Using methanol as fuel, the effects of intake temperature, excess air ratio, compression ratio and EGR ratio on the homogenous charge combustion ignition (HCCI) engine were investigated numerically. With the singlezone combustion model and detailed chemical kinetic mechanism, the combustion characteristics of the methanol engine were simulated using CHEMKIN software. The simulation results indicate that with the intake temperature increasing, the ignition timing advances, the combustion duration decreases, and cylinder temperature, pressure, heat release rate and pressure rise rate all increase. The excess air ratio has little effect on the ignition timing and has certain influences on the combustion duration. With the EGR ratio increasing, the ignition timing is retarded, the combustion duration rises, and the cylinder temperature, heat release rate and pressure rise rate all decrease. HCCI can be realized in the engine at 1 500 r/min without EGR when the excess air ratio is within the range of 5 to 9. With EGR ratio increasing, the HCCI region becomes narrower.
2010, Vol. 31 
