Browse Publications Technical Papers 2003-01-1091
2003-03-03

Numerical Simulation of Mixture Formation and Combustion of Gasoline Engines With Multi-Stage Direct Injection Compression Ignition (DICI) 2003-01-1091

Homogeneous Charge Compression Ignition (HCCI) combustion concept has advantages of high thermal efficiency and low emissions. However, how to control HCCI ignition timing is still a challenge in the application. This paper tries to control HCCI ignition timing using gasoline direct injection (DI) into cylinder to form a desired mixture of fuel and air. A homogeneous charge can be realized by advancing injection timing in intake stroke and a stratified charge can be obtained by retarding injection timing in compression stroke. Multi-stage injection strategy is used to control the mixture concentration distribution in the cylinder for HCCI combustion.
A three-dimensional Computational Fluid Dynamics (CFD) code FIRE™ is employed to simulate the effects of single injection timing and multi-stage injection on mixture formation and combustion. Effects of mixture concentration and inlet temperature on HCCI ignition timing are also investigated in this paper. Simulation results show that a homogeneous charge mixture is realized at the optimal injection timing. The mixture concentration distribution in cylinder can be controlled by changing injection timing and applying multi-stage injection. The inlet temperature and the fuel/air equivalence ratio have significant effects on HCCI ignition timing.

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