Air-cooling process is a very complex heat transfer involving the heat transfer theory and the fluid dynamics. In the paper, the experiment and numerical simulation methods are used to study the interfacial heat transfer and gas flow in the process of air-cooling, and an axisymmetric model is established to simulate the air-cooling process based on the fluid-thermal-solid coupling method. In the experiment and numerical simulation, the high-speed compressed air is used to impinge and cool the hot metallic surface. The temperatures attained in the experiment and numerical simulation are used to calculate the interfacial heat transfer coefficient (IHTC) by a self-developed inverse heat transfer analysis software. Considering the influence of turbulence model on flow, it found that the SST \(k - \omega\) turbulence model is more appropriate for the air-cooling process. Based on the SST \(k - \omega\) model, the effect of sample diameter and jet distance (distance from jet to cooling surface) on the flow pattern and temperature fields is studied, the results show that the temperatures attained in the numerical simulation are in good agreement with those of experiment, and the smaller the jet distance is, the bigger the IHTC is. Finally, the IHTCs under the different jet distance and inlet flow velocity are calculated based on the temperature curves attained in the numerical simulation.

空冷过程是一个非常复杂的传热过程，涉及传热理论和流体动力学。本文采用实验和数值模拟方法研究了空冷过程中的界面传热和气体流动，建立了基于流-热-固的空冷过程模拟轴对称模型。耦合方式。在实验和数值模拟中，高速压缩空气用于冲击和冷却热金属表面。实验和数值模拟中获得的温度用于通过自行开发的逆传热分析软件计算界面传热系数（IHTC）。考虑湍流模型对流动的影响，发现 SST \(k - \omega\)湍流模型更适用于空冷过程。基于 SST \(k - \omega\)模型，研究了样品直径和射流距离（射流到冷却表面的距离）对流型和温度场的影响，结果表明，在数值模拟中获得的温度模拟与实验吻合较好，射流距离越小，IHTC越大。最后，根据数值模拟得到的温度曲线，计算了不同射流距离和入口流速下的 IHTC。