基于Bezier曲线的气膜冷却孔出口孔形优化  

Optimization of Outlet Shape of Film Cooling Hole Based on Bezier Curve

作　　者：刘瑞[1] 文申成 张传亮 LIU Rui;WEN Shencheng;ZHANG Chuanliang(School of Energy and Power Engineering,Changsha University of Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114

出　　处：《动力工程学报》2024年第8期1173-1180,共8页Journal of Chinese Society of Power Engineering

基　　金：湖南省教育厅科学研究资助项目(15C0025)。

摘　　要：提出一种基于Bezier曲线的气膜冷却孔出口参数化构型方法,通过调整Bezier曲线的控制点,改变气膜冷却孔的出口形状。采用拉丁超立方抽样(LHS)和数值模拟的方法,获得大量不同气膜冷却孔出口形状下的气膜冷却效果,结合径向基函数神经网络(RBF-NN)所构建的预测模型和遗传算法(GA)进行气膜冷却孔出口形状优化。结果表明:优化后的气膜冷却孔可以有效抑制肾形涡对(CVP)的强度与大小,减小冷却气流与热主流的掺混损失;优化后的气膜冷却孔具有扩张的冷却通道,降低了冷却气流出口法向上的动量,有效抑制了冷却气流对于热主流的穿透,提升了气膜冷却效率;在吹风比M=0.91的情况下,最优孔形的气膜冷却效率较圆孔和扇形孔分别提升了40.48%和17.82%。Based on Bezier curve,a parameterized configuration method for outlet shape of film cooling hole was proposed.Outlet shape of film cooling hole could be changed by adjusting control points of Bezier curve.Latin hypercube sampling(LHS)and numerical simulation methods were used to obtain a large number of film cooling effects with different outlet shape of film cooling hole.Radial basis function neural network(RBF-NN)prediction model and genetic algorithm(GA)were used to optimize outlet shape of film cooling hole.Results show that the optimized cooling holes can effectively inhibit strength and size of counter-rotating vortex pair(CVP),and reduce the mixing loss between cooling flow and hot main stream;at the same time,the optimized outlet shape of film cooling hole has an expansive channel,which weakens upward momentum of cooling flow at the outlet of film cooling hole,effectively inhibits penetration of cooling flow to hot main stream,and enhances film cooling efficiency.Under the blowing ratio(M)of 0.91,the film cooling efficiency of the optimized film cooling hole is improved by 40.48%and 17.82%,respectively,compared to that of circular hole and fan-shaped hole.

关 键 词：气膜冷却 BEZIER曲线 径向基函数神经网络 遗传算法 数值模拟 

分 类 号：TK479[动力工程及工程热物理—动力机械及工程]