风扇矩阵对冷却模块空气侧流场的影响

Effect of fan configuration on air-side flowfield of cooling module

基于传统乘用车的单风扇系统,提出5种风扇矩阵形式,利用数值模拟技术分析不同矩阵形式对冷却模块空气侧流场的影响,结果表明:随着风扇数目的增加,冷却模块表面的速度均匀度皆表现出先减小后增大的变化趋势;N=4的风扇矩阵的速度分布均匀性最差,对应通过散热器的空气流量亦最小;N=15的风扇矩阵能够显著提升通过散热器的空气流量,相比原单风扇系统,空气流量提升15.6%。因此,在不降低散热器空气侧换热能力的前提下,采用该风扇矩阵形式能够使冷却系统的能耗降低,提高整车燃油经济性。采用风扇矩阵形式能够减少冷凝器前端的热回流区域,从而降低冷凝器迎风面的平均温度。

Based on the single fan configuration of a traditional passenger car, five kinds of different fan configuration are presented, and the analysis on the effection of different fan configuration on the airside flow field are carried out using numerical simulation technique. The results show that： with the increased number of fans, the velocity uniformity on the surface of cooling module firstly decrease and then increase, especially, the velocity uniformity of fan configuration of N=4 is the worst, and the air mass flow through the radiator is also minimal; however, when N=15, the air mass flow through the radiator is significantly increased by 15.6% compared to the original single fan system. On the premise that the heat transfer capability of the radiator is not decreased, the power consumption of cooling system can be reduced, the fuel economy can be improved. Furthermore, the fan configuration can effectively suppress the hotrecirculation on the front of condenser, so the average temperature on windward surface of condenser can be reduced.