Abstract: The effects of flow distributions on the light-off，warm-up performance and the temporal variation of the solid temperature were studied through numerical simulation,and an experiment of the flow distribution was carried out.The predicted velocity distribution agreed with experimental results satisfactorily.The following conclusions were obtained from the predicted light-off curves and the steady conversion efficiency,that the light-off time increases and the total outlet conversion efficiency reduces as the flow uniformity index decreases,and the conversion efficiency decreases as the radius reduces due to the reduction of residual time caused by the increase of the velocity.The analyses on the distribution of temperature in the monolith show that the solid temperatures in area near front face rise as the radius increases, and the radial gradient of solid temperature becomes greater as the flow uniformity index decreases.

摘要： 根据集成模型,通过数值试验研究了载体内的流速分布对三效催化器冷起动性能和暖机性能的影响，并对模拟的速度分布进行了试验验证.速度分布的模拟结果与试验结果吻合良好.对冷起动过程和不同均匀度指数下稳态效率模拟结果表明，流速分布越不均匀，催化剂冷起动的时间越长，冷起动期间的排放量越大; 催化效率由于速度增大，停留时间缩短，随半径减小而下降;对均匀度指数小的速度分布，总的催化效率下降.对预测的温度分布的分析发现，在载体前端面附近区域的载体温度随半径的增大而增加，在后面的区域则相反;流速分布越不均匀，径向的温度梯度越大.