Internal flow field and thermal stress analyses are conducted on the three-way catalytic converter (TWC) of a car. Firstly, a discrete model for the fluid in TWC is set up by using Gambit software, on which a CFD analysis is performed to get the pressure, temperature and velocity fields and turbulent kinetic energy distribution of the fluid in TWC at a high engine speed. Then a FE model for the structure of TWC is built to carry out a thermal stress analysis with ANASYS based on the temperature filed obtained in previous CFD analysis. The results show that the TWC with oblique cone ends has a smaller turbulence area in internal flow field, less flow energy loss and smaller and more even thermal stress in wall surface compared to the original structure with partial spherical end.%对某款车用三效催化转化器进行了内流场和热应力分析.首先用Gambit软件建立了三效催化转化器内部流体的离散模型,并利用Fluent软件对其进行CFD分析,得到发动机高转速时催化转化器内部流体的压力、温度与速度场和湍动能分布.然后建立三效催化转化器结构有限元模型,并根据其温度场分布用ANSYS软件进行热应力分析.结果表明,与采用圆弧端锥时相比,催化转化器采用斜面端锥时内部流场的湍流区域更小,流动能最损失更少,壁面热应力更小、更均匀.
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