汽车前舱散热性能的仿真与优化分析

Simulation and Optimization on Vehicle Underhood Heat Dissipation Performance

为了改善某MPV车型前舱的散热性能,针对该车型建立了前舱有限元模型,采用CFD软件对其整车流场及温度场进行数值仿真分析,综合比较了高速工况下冷却模块在CRFM(condenser,radiator,fan power train cooling module)和CFRM(condenser,fan,radiator power train cooling module)这两种布置方式对汽车散热性能的影响,并分析了风扇与散热器之间的间距对散热性能的影响。研究结果表明,CRFM布置下发动机前舱热量分布更均匀,散热效果更好;适当增大风扇与散热器两者之间的间距能显著提升前舱的散热性能,风扇与散热器之间存在一个最优距离。

In order to improve the heat dissipation performance of a MPV, a finite element model for the vehicle underhood is built. A numerical simulation on the flow field and temperature field of the vehicle is conducted by using CFD softwares. A comparison between CRFM（condenser, radiator, fan power train cooling module） layout and CFRM（condenser, fan, radiator power train cooling module） layout, together with the influence of the distance between radiator and fan, are simulated and analyzed under high speed condition. The results show that the heat dissipation performance is better in CRFM layout. And the heat dissipation performance can be improved by increasing the distance between radiator and fan, and there is an optimal distance between radiator and fan to get the best heat dissipation performance.