Abstract In order to investigate the flow and heat transfer characteristics of sister holes cooling method, sister holes cooling structures have been applied on a flat plate with four primary to sister hole diameter ratios and three inclination angles under three blowing ratios. Single cylindrical hole film cooling structure is also established as a benchmark structure. The numerical results of the single cylindrical hole case and one sister holes case are validated with the experimental results available in literatures. The tangential velocity vectors and total vorticity distributions are studied and compared. The spanwise averaged film cooling effectiveness and the adiabatic temperature contours are studied and compared. Results show that the development of the kidney vortex induced by primary hole is impeded by the sister hole induced kidney vortex and thus the film cooling performance is promoted. The blowing ratio and diameter ratio heavily affect the flow and heat transfer characteristics of sister holes cooling cases, the influence of the inclination angle is much smaller. In this paper, the best film cooling performance of sister holes cooling cases is obtained under the smallest diameter ratio.

中文翻译：

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直径比和倾角对姐妹孔气膜冷却流动传热特性的影响

摘要 为了研究姊妹孔冷却方法的流动和传热特性，在具有四个主孔直径比和三个倾角的平板上应用姊妹孔冷却结构，在三个吹气比下。单筒孔气膜冷却结构也被确立为基准结构。单个圆柱孔案例和一个姐妹孔案例的数值结果与文献中可用的实验结果进行了验证。研究和比较了切向速度矢量和总涡度分布。研究和比较了展向平均薄膜冷却效率和绝热温度等值线。结果表明，主孔诱导的肾涡的发展受到姊妹孔诱导的肾涡的阻碍，从而提高了膜冷却性能。吹风比和直径比对姐妹孔冷却箱的流动和传热特性影响很大，倾角的影响要小得多。本文在最小直径比下获得了姐妹孔冷却箱的最佳气膜冷却性能。