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为了获得孔径比与冲击距对冲击/发散冷却层板隔热屏冷却性能的影响,采用商用软件Fluent,基于加力燃烧室隔热屏的工况条件,对7组不同孔径比和7组不同相对冲击距的冲击/发散层板模型进行了三维流固耦合传热数值模拟研究,得到了层板隔热屏内部被冲击表面的Nu数、层板隔热屏气膜冷却表面的冷却效果、层板隔热屏的冷气消耗和冷流体热负荷的变化规律,其对层板隔热屏的设计具有参考价值。结果表明,Nu数与冷却效果均随着孔径比的增大而增大,随着冲击距的增大而减小。其中随孔径比增大,平均冷却效果值最大增大40.5%,随冲击距增大,平均冷却效果值最大减小3.27%。
In order to obtain the influence of the aperture ratio and the impact distance on the cooling performance of the impact / divergent heat shield, the commercial software Fluent was used to analyze the heat transfer performance of the heat shield. Relative impact distance of the impact / divergence laminar flow model of three-dimensional numerical simulation of fluid-structure interaction heat transfer has been obtained within the lamina heat shield surface Nu numbers, lamina heat shield film cooling effect of the cooling surface, the layer Plate heat shield air-conditioning consumption and cold fluid heat load changes, the design of the heat shield insulation layer has a reference value. The results show that both the Nu number and the cooling effect increase with the increase of the aperture ratio, and decrease with the increase of the impact distance. As the aperture ratio increases, the average cooling effect increases by 40.5% at the maximum. With the impact distance increasing, the average cooling effect decreases by a maximum of 3.27%.