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针对中、高吹风比下容易产生反向涡对的问题,为了改善中、高吹风比下气膜孔的冷却效率,进行了新型抗涡气膜孔的设计和研发工作。根据造型参数不同,设计了四种新型反对称涡气膜孔结构,首先研究了不同几何结构的新型气膜冷却孔对平板气膜冷却特性的影响。然后将反对称涡新型气膜冷却结构运用于叶栅端壁,前缘冷却孔排采用了不同冷却结构的单、双排冷却孔布置,计算分析了各种冷却结构在不同吹风比下对应的端壁气膜冷却特性分布。结果表明,在中、高吹风比下,不同造型条件的新型气膜冷却孔都具有较大的冷却范围,均能较好地贴合壁面,从而起到有效保护壁面的作用。
In order to solve the problem of reverse eddy-vortex pairs in middle and high blowing ratio, in order to improve the cooling efficiency of the film hole at middle and high blowing ratio, a new type of anti-vortex film hole was designed and developed. According to different modeling parameters, four new types of anti-symmetric vortex pore structures are designed. The effects of the new film cooling holes with different geometries on the cooling characteristics of the flat film are studied. Then, a new film cooling structure of antisymmetric vortex was applied to the end wall of the cascade. The cooling holes of the leading edge were arranged with single and double rows of cooling holes with different cooling structures. The corresponding cooling structures were calculated and analyzed under different blowing ratios Endwall film cooling characteristics distribution. The results show that under the condition of medium and high blower ratio, the new film cooling holes with different molding conditions have a larger cooling range, which can better fit the wall surface and thus effectively protect the wall surface.