摘要
应用Realizable k-ε紊流模型对吹风比为0.5、1.0、1.5和2.0的三维气膜冷却流场进行了数值模拟,分析了回流区和反向涡旋对(CVP)对射流下游壁面换热的影响。计算结果表明,壁面换热峰值点位于分离点附近,在分离点后,努塞尔数沿流动方向逐渐降低;努塞尔数并不随吹风比的变化而单调变化,而是在吹风比为1.0时存在最佳值。
Numerical simulation is performed to investigate the heat transfer characteristics of the 3D film cooling flows, using the realizable model at the flow ratios of 0.5,1. 0, 1.5, and 2.0. The influence of the separate bubble and the counter-rotating vortex pair （CVP） on the heat transfer characteristics downstream of the jet is studied. The results show that the most intensive heat transfer takes place well near the reattachment point and Nusselt decreases along flow direction after the reattachment point. Nusseh doesn t monotonously vary with changing flow ratio but attains an optimum with a ratio of 1. 0.
出处
《东北电力大学学报》
2008年第6期75-79,共5页
Journal of Northeast Electric Power University
基金
国家自然科学基金资助项目(50606005)
关键词
气膜冷却
数值模拟
传热特性
反向涡旋对
Film cooling
Numerical simulation
Heat transfer
Counter-rotating vortex pair
