某MPV车型发动机舱散热性能仿真与优化研究

Simulation and Optimization on Heat Radiation Performance of Engine Room of a MPV Model

随着发动机舱的布局日益紧凑,发动机舱的散热问题日益凸显,而冷却部件的布置方式对发动机舱散热性能影响较大,因此通过优化冷却部件布置方式来改善发动机舱散热性能具有重要意义。采用理论分析与CFD数值模拟仿真相结合的方法对发动机舱的流场及温度场进行分析,通过调整散热器组件之间的距离对发动机舱散热性能进行优化,获得散热器组件之间的最优距离,并通过整车热平衡实验进行实车验证。结果表明:风扇与散热器之间的距离增大40 mm,冷凝器与散热器之间的距离增大20 mm时,发动机舱的散热性能得到最大提升。

With the compactness of engine room,the heat radiation problem of an engine room becomes critical. The arrangement of cooling parts has a direct impact on the heat radiation performance of the engine room. Thus,it is essential to improve the heat dissipation performance of engine room by optimizing the arrangement of cooling parts. In this paper,CFD numerical simulation is utilised to analyse the gas flow field and temperature gradient of engine room,and optimize the engine cooling performance by looking for the best radiator module distance. Vehicle thermal balance test of real vehicle has also been carried out for verification. The results indicate that the distance between the fan and the radiator increases by 40 mm and the distance between the condenser and the radiator increases by 20 mm,engine is at its optimal performance on heat radiation.