催化转化器流场分析及关键结构参数优化

Flow Analysis and Key Structural Parameter Optimization of Catalytic Converter

运用计算机流体力学软件对催化转化器内流场进行三维稳态流动数值模拟分析,发现该款催化转化器的性能存在很大的提升空间。为了提高催化转化器的流速均匀性,减少压力损失,针对关键结构参数(载体位置、长度和出气管位置)提出结构优化方案,并进行内流场数值模拟对比分析。最后归纳出了关键结构参数对催化转化器性能的影响规律,即载体左移、减小载体长度、向下移动出气管,均可改善载体前端流速均匀性,降低出入口压力损失,提高转化效率。

The numerical simulation analysis of three-dimensional steady flow field in catalytic converter was carried out by using the computational fluid dynamics software. In order to improve the velocity uniformity in catalytic converter and reduce the pressure loss,the structural optimization scheme was proposed for key structural parameters（ such as the carrier position,carrier length and outlet pipe position）,and the numerical simulation of internal flow field was compared. Finally the law of effect of key structural parameters on the performance of catalytic converter was summed up： moving the carrier left,reducing the carrier length and moving down the outlet pipe can improve the uniformity of velocity vector on the front of the carrier,reduce the pressure loss and improve the conversion efficiency of catalytic converter.