Numerical computed methods for intake manifolds in gasoline engine

LI Hongmiao, LIU Zhentao,SUN Zheng, HUANG Rui

(Institute of Power Machinery and Vehicular Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the effect of the results of two methods on flow field characteristics and air inlet uniformity of the intake manifold,two numerical calculation methods were used to simulate two models of intake manifold of a fourcylinder gasoline engine. Meanwhile, an engine test bench was established to verify the reliability of two numerical calculation methods on engine performance, fuel economy and running stability.The results indicate that the using “four allpass” and the “three close” of these two kinds of numerical computing methodsfor air intake resistance change trend is consistent, both are suitable for air intake resistance simulation analysis; the results of air inlet uniformity vary widely;the “three close,one pass” numerical calculation method is more suitable intake manifold air intake uniformity analysis.

Key words: intake manifold; numerical simulation; intake uniformity