本文对开槽前扩孔及在此基础上加30°、45°和60°不同角度复合角的气膜冷却结构进行了数值模拟,计算了指定冷却壁面的温度场分布以及冷却效率.结果表明:引入复合角后,能够改善冷却气膜在壁面的横向分布,复合角越大,气膜分布越均匀.在高吹风比下,复合角结构能够产生较大的气膜覆盖范围和较好的冷却效果.
Numerical simulation technique is used to investigate the effects of a compound angle (30°,45°or 60°)on the film cooling performance based on a trench-shaped hole geometry.From the film cooling efficiency and velocity distribution,the results indicate that the compound angle can improve the lateral coverage of cooling film over a hot surface.Moreover,with the increase of the compound angle,the cooling film shows considerable uniform cover and better cooling performance,especially at a high blowing ratio.
参考文献
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