Abstract: In view of the problem that the air intake of cooling system can not meet the requirements when the opening area of the grille can not be increased in the design stage of a passenger car, the paper analyzes the reasons of insufficient air intake of cooling system according to the results of simulation calculation based the Star ccm+software simulating flow field in a passenger car. According to the analysis of the cloud chart of the simulation results, the improvement measures of adding the guide plate in the water tank and optimizing the guide plate on both sides of the fan are worked out to increase the air intake volume of the cooling system, which is finally verified by the hub test of the cooling system. This paper provides a solution to improve the cooling performance of passenger cars without increasing the grille opening area, and provides a reference for the development method of cooling system in the design stage of vehicle models.

Key words: Passenger car; Cooling system; Air volume; Simulation optimization

摘要： 针对某乘用车在设计阶段中格栅开口面积不可增大的情况下，冷却系统进风量无法满 足要求的问题，文章利用 Star ccm+软件对乘用车内流场进行仿真，并根据仿真计算的结果， 分析冷却系统进风量不足的原因。通过对仿真计算结果云图的分析，制定出增加水箱导流板 以及优化风扇两侧导流板的改进措施，冷却系统的进风量增大，最后通过了冷却系统转毂试 验的验证。文章在不增大格栅开口面积的前提下为乘用车冷却性能的提高提供一种解决思路， 为车型设计阶段冷却系统的开发方法提供参考。

关键词: 乘用车；冷却系统；进风量；仿真优化