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为保障汽车发动机冷却效果,需在整车开发项目前期就对前端进风提出量化需求。本文通过提炼物理数学模型,结合发动机台架试验数据与汽车运行受力分析,得到不同工况下的发动机散热量,并据此算出前端进风量需求。将此方法应用于某全新车型的项目开发,以CFD数值模拟校验结果为设计调整依据,最终顺利通过了在环模风洞中进行的发动机冷却性能试验,证明该物理数学模型具有较好的预测能力。
In order to ensure the cooling effect of automobile engine, it is necessary to quantify the front air intake in the early stage of vehicle development project. In this paper, the physical mathematical model is refined, the test data of the engine bench and the force analysis of the vehicle operation are analyzed to get the heat dissipation of the engine under different working conditions, and the demand of the front air intake is calculated accordingly. The method was applied to the project development of a new model. Based on the results of CFD numerical simulation, the method was finally adopted as the basis for the design adjustment. Finally, the method was successfully passed the test of engine cooling performance in a ring-shaped wind tunnel, which proves that the physical mathematical model has good Ability to predict.