基于脉动效应的进气管结构优化分析

摘要

In this paper, the intake pipe length of the engine was optimized for 125cc single-cylinder gasoline engine considering the inertia effe6t and resonance effect of intake pipe in the process of engine gas exchange in order to meet the economical rotational speed of engine in race. The simulation results would applied to improve the intake pipe structure so as to reduee cost and short design. The comparison between the simulation and experimental resuhs of engine speed show that the use of inlet pulse could improve the engine power and fuel economy.%以125cc单缸汽油发动机为研究对象，在节能赛事工况的经济转速范围内，充分利用发动机在换气过程中进气管内气体流动的惯性效应和谐振效应，对发动机进气管长度进行优化设计。通过对理论模型的推导和计算机仿真的分析，为进气系统的改进提供了方向性的指导意见，从而减少了试验成本，缩短了优化改进周期；通过测功机台架的发动机速度特性试验，对比安装原进气管和改进后进气管的数据，证明有效利用进气脉动效应能够提高发动机的动力性和燃油经济性。