Numerical Simulation of Gas Flow in a Gasoline Engine Under Different Valve Lifts

摘要

The gas flow in the intake ports affects the gas flow characteristic in the engine cylinder and affects the performance of the engine indirectly. In this paper, based on the intake ports of a gasoline engine, the steady numerical simulation of the gas flow in the intake ports and cylinder is done by AVL Fire. The simulation results give the flow coefficient curve under different valve lifts, which provides theoretical basis for the design of the valve cam. At the same time the stream line, flow speed and interference of gas flow in the intake ports and cylinder under different valve lifts is simulated, which will give the theoretical supports for the design of the intake ports and the valves, and improve the gasoline injecting.