不同吹风比下双出口孔射流气膜冷却数值模拟计算

为了获得吹风比对新型气膜冷却孔冷却效率的影响规律,利用Fluent软件求解Navier-Stokes方程,对吹风比分别为0.5、1.0、1.5和2.0时单入口-双出口孔射流冷却效率进行了数值模拟计算,得到了不同吹风比下的流场和冷却效率.结果表明：吹风比对冷却效率有很大影响;随着吹风比的提高,不同次孔方位角下的冷却效率变化规律也不相同;当次孔方位角γ=30°时,吹风比为1.0时的冷却效率最高;当γ=45°时,冷却效率随着吹风比提高而提高;当γ=60°时,冷却效率随着吹风比提高而降低;在研究高吹风比对气膜冷却效率的影响时,γ=45°最佳.

Numerical Simulation of Film Cooling Effectiveness with Double Outlet Hole Injection at Different Blowing Ratios

To study the influence of blowing ratio on film cooling effectiveness with injection through a novel film cooling hole,a numerical simulation was carried out on the cooling effectiveness with one-inlet double-outlet hole injection by the use of Fluent software to solve Navier-Stokes equation at blowing ratios of respectively 0.5,1.0,1.5 and 2.0,during which various flow fields and cooling effectiveness were obtained at above blowing ratios.Results show that blowing ratio has significant influence on the film cooling effectiveness.With the rise of blowing ratio,the cooling effectiveness changes in different laws with the orientation angle of hole;for an orientation angle of 30°,the cooling effectiveness reaches the highest at a blowing ratio of 1.0,whereas for an angle of 45°,it rises with growing blowing ratio,and for an angle of 60°,the cooling effectiveness reduces with the increase of blowing ratio.At higher blowing ratios,the optimum orientation angle is found to be 45°,when better cooling effectiveness can be obtained.