关键词: 发动机；进排气道；流量；仿真分析

Abstract: The original air duct of a certain car engine has a relatively simple structure and there is no smooth transition at the junction of the inlet and outlet sections of the air duct, resulting in significant cross-sectional shrinkage and increased gas flow loss. We are now analyzing and adjusting the engine characteristic parameters to increase engine power and reduce engine fuel consumption. This article has made a preliminary modification to the original intake and exhaust duct model. After raising the protrusions where the intake and exhaust valve ducts are located by 2 mm, there is not much difference in the simulation results of the flow field between the intake and exhaust ducts and the original engine. The flow rate of the intake and exhaust ducts is only increased by about 1%, and the effect of improving the flow rate of the exhaust duct is slightly better. Therefore, in order to significantly improve the inflation efficiency and engine performance, it is necessary to improve the overall geometric structure of the duct. Therefore, this article has redesigned three schemes for the intake duct structure. From the calculation results, it can be seen that each scheme has a significant increase in intake flow rate, which can support the improvement of engine power. The analysis and research in this article can reduce oil consumption and improve the combustion efficiency of automotive engines.

Key words: Engine; Inlet and exhaust airways; Flow; Simulation analysis