小型二冲程汽油机排气动力过程的计算机模拟

Computer Simulation of the Exhaust Gas Dynamic Processes of Small Two-stroke Gasoline Engines

根据非定常气体流动理论,建立了二冲程汽油机排气动力过程的数学模型,并用特征线法对其进行了模拟计算,压力波的数值解析结果与实测结果比较吻合,表明所用模型和计算方法正确,可用于指导设计二冲程汽油机的排气动力效应系统.

Based on the unsteady flow gas dynamic theory, this paper sets up a mathematical model for the exhaust system of small two-stroke gasoline engine and simulates the exhaust gas dynamic processes by using the method of characteristics. The calculated pressure-wave diagrams for the exhaust pipe are quite in conformity with the measured ones, so both the model and the method are correct and can be used to design the exhaust dynamic effect system for small two-stroke gasoline engines.