新型反对称涡气膜冷却结构设计及其数值研究

Design and Numerical Study of Anti-Vortex Film Cooling Hole

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 improve the film cooling effectiveness in the middle and high blowing ratios due to the counter rotating vortices occurred easily,the new kinds of film cooling holes with anti-vortex configuration are proposed and investigated in this paper.Four anti-vortex film cooling holes are designed based on the different geometrical parameters,and the flow structure and film cooling effectiveness characteristics of the flat plate using the anti-vortex holes have been investigated firstly. Then the anti-vortex film cooling design are applied in the cascade endwalls with cooling holes arrayed in a single row and in double rows respectively,and the film cooling characteristics of different cooling configuration in each blowing ratio are numerically analyzed.The results indicate that the all anti-vortex film cooling holes have the larger cooling area and the coolant jet close to the cooling surface,thus protecting the surface effectively.