A computational analysis was carried out on the film cooling technique over the surfaces of eroded plates. The air–water mist coolant was injected through the slotted hole. A flat plate was patterned with various erosions. The loading fraction, f = 4–16%, and blowing ratio, M = 1–1.6, were simulated to understand their influence on the mist film cooling effectiveness. The coolant injection angle or the inclined angle of the secondary slot was kept at α = 35°. It can be observed that the increasing loading fraction raises the film cooling performance. Likewise, a higher blowing ratio can provide a better film cooling over the target surface. Again, it is found that the presence of erosion increases the cooling effectiveness at the particular surface of erosion. Simultaneously, a decrease in the effectiveness can also be noticed at the adjacent flat surfaces. Additionally, the erosions at the further downstream are more effective over the eroded surface compared to the upstream erosions. Considering the size of erosion as a crucial parameter, it was investigated for three different depth sizes. An increment in the mist film cooling performance is observed for the higher depth erosion.

中文翻译：

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用于喷射空气-水雾冷却剂的腐蚀板上的薄膜冷却

对侵蚀板表面的薄膜冷却技术进行了计算分析。空气-水雾冷却剂通过长孔注入。平板上有各种侵蚀图案。模拟负载分数 f = 4-16% 和吹气比 M = 1-1.6，以了解它们对雾膜冷却效果的影响。冷却剂注入角或副槽的倾斜角保持在 α = 35°。可以观察到，增加的负载分数提高了薄膜冷却性能。同样，更高的吹气比可以在目标表面上提供更好的薄膜冷却。再次发现，侵蚀的存在增加了特定侵蚀表面的冷却效率。同时地，在相邻的平面上也可以注意到效率的降低。此外，与上游侵蚀相比，更下游的侵蚀在侵蚀表面上更有效。考虑到侵蚀的大小作为一个关键参数，对三种不同的深度大小进行了研究。对于更高的深度侵蚀，观察到雾膜冷却性能的增加。