超椭圆孔型对气膜绝热冷却效率的影响

Numerical simulations are performed to investigate the effects of super-elliptic film holes on adiabatic film cooling effectiveness under three blowing ratios (M = 0.5, 1.0, 1.5). The results show that compared with the basic circular model, super-elliptic model I with length-to-width ratio of 2 provides the better film cooling effectiveness in the range of x/D < 5 at M = 0.5 while at M = 1.0 the better film cooling effectiveness is observed in the range of x/D <17.35 and at M = 1.5 the higher film cooling performance is shown along the mainstream direction. However, due to the large laterally coverage of the film, super-elliptic model II with length-to-width ratio of 4 exhibits the best film cooling effectiveness at three different blowing ratios among all models. Such advantages become more significant with the increase of the blowing ratio.