Abstract: In order to accurately predict the pressure drop performance of the vehicle oil cooler, a computational fluid dynamics (CFD) simulation model of the pressure drop for the oil cooler is established and a text comparative study is carried out.Based on the k-omega shear stress transfer (SST) turbulence model and the porous media model, the problem is simplified modeling and the mesh independence verification is performed at the same time. The flow field simulation of the water side channel of the oil cooler is carried out to obtain the static pressure drop from the inlet to the outlet. Compared with the test data, at 40 L/min, the result predicted by CFD is 10.1% lower than the test value. The decomposition and analysis of the total pressure drop of the oil cooler shows that the internal channel contributes the most to the total pressure drop, accounting for 65.2%. The flow of each channel is relatively average, and for a single channel, except for the inlet splitter and outlet header, the flow in the middle fin area is mainly along the length direction, and the flow is relatively uniform, and there is a vortex structure in the inlet splitter.

Key words: Oil cooler; CFD; Pressure drop performance; Porous media

摘要： 为了准确预测车辆机油冷却器的压降性能，建立了油冷器压降的计算流体动力学（CFD） 仿真模型并进行试验对比研究。基于 k-omega 剪切应力传输（SST）湍流模型以及多孔介质 模型对问题进行简化建模，同时进行网格无关性验证，对油冷器的水侧流道进行流场仿真， 获得从进口到出口的静压降。与试验数据对比，40 L/min 时，CFD 预测的结果比试验值低了 10.1%，对油冷器进行总压压降分解及分析表明，内部通道对总压降的贡献最大，占比为 65.2%。各个通道的流动比较平均，对于单个通道而言，除去进口分流头和出口集流头部分， 中间的翅片区域主要沿长度方向流动，且流量比较均匀，进口分流头存在涡流组织。

关键词: 油冷器；CFD；压降性能；多孔介质