车用催化转换器气流特性分析

Gas Flow Features of Automotive Catalytic Converters

用CFD软件对三种不同入口扩张管角度的催化转换器的速度场、压力场进行了三维稳态流动数值模拟。模拟结果显示,入口扩张管的角度对催化转换器的气流分布有很大影响,采用较小角度的入口扩张管,不仅可减少压力损失,而且可以使其内部速度分布更加均匀。

In this article,multi-dimensional numerical simulation about velocity field and pressure field of steady flows in the catalytic converters for three different entrance angle of the expansion tube is performed.Simulation results show that the entrance point of the expansion tube has a great impact on the flow of catalytic converters.Using a smaller angle of the entrance of the expansion tube,not only reduce the pressure loss,but also make more uniform velocity distribution.