关键词: 气膜冷却, 曲率, 旋转, 数值模拟, 冷却效率

Abstract: A numerical study is conducted to investigate the cooling performance of films over rotating curved surfaces, and the influence of rotation number is obtained under different conditions. In the present study, the Reynolds number (Re) based on mainstream velocity and film hole diameter is 4 797, the blowing ratio (M) is 0.4, and the rotation number(Rt) changes from 0 to 0.023 9. A shearstress transports (SST) model is selected for turbulence closure. The results show that the effect of the rotation number is obvious: deflection angles are improved with the increasing rotation numbers; the augmentation of Rt results in decreased adiabatic effectiveness for convex surfaces, while for concave surfaces, increasing Rt leads to improved adiabatic effectiveness. In addition, increasing Rt tends to bridge the differences of film cooling effectiveness between the convex and concave surfaces.

Key words: film cooling, curvature, rotating, numerical simulation, adiabatic effectiveness