Based on the CFD analysis of a gasoline direct injection (GDI) engine, intake, spray and mixing process are studied. Validated by transparent engine test, CFD simulation can guide design of GDI combustion system efficiently. Five-factors which influence the mixing and combustion process of GDI engine have been proposed, namely dynamic tumble strength, turbulent kinetic energy intensity, fuel impingement, degree of homogeneity and air-fuel ratio around spark plug. A criterion of Five-factors is set up, which solve many problems in GDI engine development and realize high combustion efficiency.

KEYWORDS – CFD; GDI; Five-factors; Air-fuel Mixing; Combustion

Jun, Li; Fujian, Hou; Jincheng, Li; Haie, Chen; Hongzhou, Li; Jiaquan, Duan; Yaodong, Liu - R&D CENTER, CHINA FAW GROUP CORPORATION