船用散热器空气流动的数值模拟

Numerical Simulation of the Airflow of a Radiator

基于标准k-ε湍流模型,分别采用正交六面体结构化网格与四面体非结构化网格进行网格划分,使用有限体积法对船用空气散热器内部腔室的流动进行数值计算,模拟散热器各个出口冷却气流的流动情况。比较发现,采用正交六面体结构化网格的计算结果的精度要高于四面体非结构化网格,其仿真更加逼近真实的流动状态。采用六面体网格划分进行数值模拟,发现气流在出口处所受到的喷管效应且气流的形态成直线,各出风口的出风量通过阶梯型设计处于均匀分布状态。

The air-flow of the cavity of an air radiator was numerically simulated by the finite volume method based on the kε turbulence model. The radiator was meshed with the structural grid of orthogonal hexahedron and unstructured grid of tetrahedron respectively. It was found that the result of the structural mesh of orthogonai hexahedron showed better precision than the result of the unstructured mesh of tetrahedron. The result of the former one approaches the real air-flow of the radiator in a precise way. Based on the result of the structural mesh of orthogonal hexahedron, we found that the air-low in the vicinity of the outlets is subject to nozzle effect with the shape of straight line. In addition, the magnitude of the flow rate of the air-flow of the four upper outlets was almost equal, which achieved good balance.