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.
Citation: Sun, Y., Shuai, S., Wang, J., and Wang, Y., "Numerical Simulation of Mixture Formation and Combustion of Gasoline Engines With Multi-Stage Direct Injection Compression Ignition (DICI)," SAE Technical Paper 2003-01-1091, 2003, https://doi.org/10.4271/2003-01-1091. Download Citation
Yong Sun, Shi-Jin Shuai, Jian-Xin Wang, Yan-Jun Wang
State Key Laboratory of Automotive Safety and Energy, Tsinghua University
SAE 2003 World Congress & Exhibition
Homogeneous Charge Compression Ignition (Hcci) Combustion 2003-SP-1742