为了优化气膜冷却结构,通过数值模拟研究了一种新型气膜孔(由两个圆柱孔组成的双出口孔)的气膜冷却换热特性。利用Fluent软件对N-S方程进行求解,湍流模型采用两方程realizable k-ε模型和增强壁面函数处理。重点研究了吹风比对气膜冷却换热系数、换热系数比和热流比的影响。结果表明,换热系数随吹风比增大而增大,随x/d增大而减小,气膜孔附近尤其明显。吹风比0.5和1.0时,换热系数比随x/d增大而减小;吹风比1.5和2.0时,换热系数比随x/d增大先减小后增大。在研究的吹风比范围,双出口孔射流气膜冷却起到了削减从燃气传入叶片热流的作用。吹风比从0.5增大到1.0,热流比减小;吹风比从1.0增大到2.0,热流比增大。热流比随x/d增大而增大,气膜冷却的冷却效果减小。 In order to optimize the structure of the film cooling, the film cooling heat transfer characteristics of a new type of film hole (double outlet hole composed of two cylindrical holes) were studied by numerical simulation. The Fluent software is used to solve the N-S equation. The turbulence model uses two-equation realizable k-ε model and enhanced wall function. The effect of blowing ratio on the heat transfer coefficient, heat transfer coefficient ratio and heat flux ratio of gas film was mainly studied. The results show that the heat transfer coefficient increases with the blowing ratio increases, decreases with the increase of x / d, especially near the film hole. When the blowing ratio is 0.5 and 1.0, the heat transfer coefficient decreases with the increase of x / d. When the blowing ratio is 1.5 and 2.0, the heat transfer coefficient decreases and then increases with the increase of x / d. In the studied blow ratio range, the dual outlet hole jet film cooling served to reduce the effect of heat flow from the gas inlet vanes. The blowing ratio increased from 0.5 to 1.0, and the heat flux decreased. The blowing ratio increased from 1.0 to 2.0, and the heat flux increased. The heat flux increases with the increase of x / d, and the cooling effect of film cooling decreases.