车用催化器流场数值模拟及其在结构优化设计中的应用  

Numerical Simulation of Flows in Automotive Catalytic Converters and Its Application on Optimum Structure Design

作　　者：帅石金[1] 王建昕[1] 庄人隽[1] 陈峻锐[1] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《内燃机学报》2000年第2期211-216,共6页Transactions of Csice

基　　金：博士后科学基金研究项目

摘　　要：采用当量连续法建立了催化器蜂窝载体的流体动力学模型 ,并用 STAR-CD软件对各种结构催化器的稳态流场进行了多维数值模拟。为了验证模型的精度 ,用毕托管测量了催化器载体后的速度分布 ,并与模拟结果进行比较 ,计算值与测量值吻合良好。在此基础上 ,用软件对扩张管、载体形状和载体之间的缝隙等影响催化器流动特性的因素进行了研究。A mathematical model of the flows in honeycomb monolith was established by an equivalent continuum approach,and the commercial CFD code STAR-CD was utilized to simulate multidimensional steady turbulent room-air flow in catalytic converters with different configurations.In order to verify the computing model,a Pitot tube was used to measure the velocity distributions along radius direction in the converters.Validations demonstrate that computing results agree well with experimental ones.On the basis of the model validation,various structures and configurations of the converters such as different inlet cone angles,the monolith shape and length,the gap between monolith and the like,were chosen to be simulated and analyzed.Simulation results offer a practical guide to the optimum design of automotive catalytic converters.

关 键 词：车用催化器 数据模拟 优化设计 汽车 发动机 

分 类 号：U464.136[机械工程—车辆工程]