车用催化转化器起燃特性的数值模拟  

Numerical Simulation of Catalytic Converter ignition Characteristics

作　　者：高伟[1] 孙希[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：《汽车实用技术》2015年第9期97-101,共5页Automobile Applied Technology

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

摘　　要：利用ANSYS Workbench软件建立某催化转化器载体单孔道二维几何模型及有限元模型,在FLUENT软件中,采用层流有限速率湍流模型,对其起燃特性进行了数值模拟,分析了载体内温度、流速、压力及尾气各气体组分的变化过程,基本上反映了催化转化器起燃过程的实际情况,所得到的速度场、温度场、压力场和各组分质量分数分布图趋势均正确合理。在此基础上,分析了载体参数对催化转化器起燃特性和转化效率的影响,并对载体入口速度和温度进行了优化设计。结果表明,尾气各气体转化率随着入口温度的增加而增加,当入口速度增加时,尾气各气体转化率先增加后减小。In this paper, the two-dimensional geometric model and finite element of carrier single channel of a catalytic converter was established by using ANSYS Workbench software. In FLUENT software by using laminar flow finite-rate turbulence model, the ignition characteristics of catalytic converter was numerical simulated. The temperature, flow rate, pressure and the changing process of exhaust gas components in carrier was analyzed.These results basically reflect the actual situation of catalytic converter ignition process.The trend of velocity field, temperature field, pressure field and gas components mass fraction distribution are correct and reasonable. On the basis, The impact of carrier parameters on the catalytic converter ignition characteristic and conversion efficiency were analyzed.The inlet velocity and temperature of carrier were optimized.The simulated results show that the exhaust gas conversion rate increases with the increasing temperature of the inlet. When the inlet speed increases, exhaust gas conversion rate increases first and then reduces

关 键 词：催化转化器 起燃特性 数值模拟 

分 类 号：U463.9[机械工程—车辆工程]