To solve the problem of engine compartment overheat,numerical simulation on the flowing properties of the front engine compartment on a passenger car was done.Experiments on heat exchanger's air pressure performance as well as airflow field test both in and around bus were conducted to verify the the simulation model.Temperature field and velocity field of important sections of the engine compartment were analyzed,so as to locate the anomalous temperature points or unreasonable flow field distribution and find out the reasons for heat reflux and air input,thus proposing that advancing cooling modules and increasing the grille deflector can effectively reduce heat reflux and increase air input.Simulation results confirm that the proposal for improvement can effectively reduce the overall temperature of the engine compartment.Simulation plays an important role in early stages of vehicle development,shorteningthe development cycle and reducing development costs.%为解决发动机舱过热问题,对某前置客车发动机舱的流动特性进行数值模拟计算.并通过换热器风阻特性实验及客车内外流场试验,验证仿真模型的正确性.通过分析发动机舱重要截面的温度场和速度场,找出机舱内的温度异常点及流场分布不合理的地方,分析产生热回流及进风量较小原因,提出改进方案.通过前移冷却模块和在格栅处增加导流板可有效减少热回流、增大进气量.仿真结果验证改进方案可有效降低发动机舱整体温度.仿真模拟在车辆前期开发过程中起着重要作用可以缩短开发周期,节省开发成本.
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