基于多尺度方法，采用 Ansys Fluent 模拟机油冷却器的压降及传热性能。为提高仿真精度，根据机油冷却器精细结构模型的仿真数据，提出并建立了任意坐标处散热翅片的热流密度方程。仿真条件分别为热侧速度 0. 001、0. 1、0. 2、0. 3m/s，冷侧速度0. 1、0. 2、0. 3、0. 4m/s。在此基础上，利用精细结构模型数据，计算得到动量源项方程及热流密度方程。在油冷器热侧质量流量分别为0. 04、0. 08、0. 12、0. 16kg/s，冷侧体积流量为 5 × 10^-4 m³ /s 的条件下，对油冷器压降及传热性能进行模拟。结果表明:仿真数据与实验测量数据吻合度较高，相对误差在 10% 以内。多尺度仿真方法的精度满足一般工程应用需求。

The pressure drop and heat transfer performance of an oil cooler were simulated on Ansys Fluent with the multi-scale method． In order to improve the simulation accuracy，the heat flux equation of the fins at arbitrary coordinates was established according to the simulation data of the micro-scale model in the oil cooler． The simula-tion conditions were 0. 001、0. 1、0. 2 and 0. 3 m/s on the hot side，and 0. 1、0. 2、0. 3 and 0. 4 m/s on the cold side，respectively． On that basis，the momentum source term equation and the heat flux equation were calcu-lated with the micro-scale model data． The pressure drop and heat transfer performance of the oil cooler were simu-lated under the condition that the mass flow rate on the hot side was 0. 04、0. 08、0. 12、0. 16 kg/s，respectively and the volume flow rate on the cold side was 5 × 10^-4 m³ /s． The research shows that the simulation data is in good agreement with the experimental data，and the relative error is within 10%． The accuracy of the multi-scale simulation method can meet the requirements of general engineering applications．