汽油车三效催化转化器反应流的数值模拟  

Numerical Simulation of Reacting Flow in Automobile Three-Way Catalytic Converter

作　　者：龚金科[1] 康红艳[1] 彭炜琳[1] 翟立谦[1] 鄂加强[1] 袁文华[1] 

机构地区：[1]湖南大学现代车身技术教育部重点实验室,湖南长沙410082

出　　处：《内燃机学报》2006年第1期62-66,共5页Transactions of Csice

基　　金：湖南省科技攻关基金项目(200287);国家"985工程"建设项目子项(20041)

摘　　要：建立了三效催化转化器载体单个孔道内的二维流场模型,并且加入了详细化学反应机理,该机理考虑了8种气体组分和23种表面物质,共有61个基元反应。用计算流体力学软件对反应流进行了数值模拟,得到转化率随温度的变化情况,与试验值吻合良好。并且对模拟得到的气体组分的质量分数分布图进行了分析,得到了流场与催化剂表面化学性质之间的关系,对如何提高三效催化转化器转化率具有重要的参考价值。A two dimensional flow-field model including a detailed chemical reaction mechanism for a single channel in three-way catalytic converter is established. The model consists of 61 elementary reactions among 8 gas species and 23 surface species. The computational fluid dynamics software is used to simulate the reacting flow and the conversion rates as a function of temperature are obtained. Good agreement between simulation and experiments is achieved. In addition, the interactions between the flow field and the catalytic surface chemical properties are obtained by analyzing the simulated mass fraction profiles of the gas species, and this provides an important reference to the improvement of conversion rates of the TWC.

关 键 词：三效催化转化器 反应流 化学反应机理 数值模拟 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]