基于Fluent软件的三元催化器结构优化

依靠经验或半经验设计三元催化器需耗费大量精力和财力，且设计周期长，利用CFD软件仿真分析催化器内部流场可大大缩短设计周期。文章在Gambit软件中建立了某款三元催化器3维流体离散模型，用Fluent软件分析了三元催化器的压力、温度、速度和湍动能等内部流场分布，并介绍了催化器收缩管和扩压管锥角对催化器内流场的影响。表明随着催化器收缩管和扩压管锥角的减小，催化器背压减小，流动能量损失减小，气流的有效流动区域增加，有利于提高载体的利用率，进而提高催化器催化转化率。该方法对三元催化器优化设计有一定的参考价值。

Structure optimization of Three-way Catalytic Converter Based on Fluent Software

Designing three-way catalytic converter with experiment and principles needs a lot energy and finance, and design cycle is long. Using CFD simulation analyzing converter inner fluid can shorten the design cycle. This paper established the three-dimensional fluid disperse model of the catalytic converter with Gambit software, then analyzed the pressure, temperature, velocity and turbulent kinetic energy distribution of catalytic converter using Fluent software, and finally studied the influence of catalytic converter＇s contraction pipe and diffuser cone angle on its inner fluid field briefly. It is indicated that with the decrease of contraction pipe and diffuser＇s cone angle, back pressure of catalytic converter and flow energy loss is reduced and the effective flow areas are increased, it is benefit to increase the carrier＇s utilization rate and catalytic converter＇s conversion rate of catalytic reaction. This method can provide some references for the optimal design of catalytic converter.