车用催化转化器内流场CFD分析与结构优化设计  

Analysis of internal flow field of automotive catalytic converter with CFD and optimal design

作　　者：高伟[1] 邓召文[1] 梁伟强[1] 

机构地区：[1]湖北汽车工业学院汽车工程学院,湖北十堰442002

出　　处：《合肥工业大学学报（自然科学版）》2014年第7期777-783,共7页Journal of Hefei University of Technology：Natural Science

基　　金：湖北省教育厅科学技术研究计划优秀中青年人才资助项目(Q20122301)

摘　　要：文章利用ANSYS Workbench软件,建立了催化转化器内流场的三维模型及有限元模型,应用计算流体动力学(CFD)技术对其内流场进行了三维稳态流动数值模拟。结果表明,该催化转化器载体内流速分布不均匀,且其压力损失占总体压力损失比重较大。在此基础上,研究了入口扩张管锥角、出口收缩管锥角、载体位置、载体长度等结构参数对催化转化器内流场特性的影响,分析了载体内速度分布和催化转化器压力损失的变化规律,并对其结构进行了优化设计,得出了一种较优的结构,从而使载体内速度分布更均匀,催化转化器的压力损失下降了18.9%,排气背压降低,提高了发动机的性能。The three-dimensional model and finite element model of the internal flow field of catalytic converter were established by using ANSYS Workbench software .The three-dimensional numercial simulation of the steady flow in the internal flow field was performed by using the computational fluid dynamics（CFD） method .The results show that the velocity distribution in the substrate of catalytic converter is nonuniform and its pressure loss accounts for large proportion of the total pressure loss . On this basis ,the effect of the structure parameters ,such as the inlet diffuser cone angle ,the outlet collapsible tube cone angle ,the position of substrate ,and the length of substrate ,on the internal flow field of catalytic converter was investigated .The velocity distribution in the substrate and the variation laws of pressure loss were analyzed .The optimal design for the structure of catalytic converter was made and an optimum structure was obtained .With the optimum structure ,the velocity distribution in the substrate is more uniform ,the pressure loss in catalytic converter decreases 18 .9% ,and the back pressure of exhaust is reduced ,thus improving the performance of engine .

关 键 词：催化转化器 内流场 计算流体动力学 优化设计 

分 类 号：TK414.5[动力工程及工程热物理—动力机械及工程]