射流、旋流、出流共同作用下矩形通道换热特性

在放大模型上详细研究了不同雷诺数和出流比下涡轮叶片内冷通道中冲击靶面、出流面和冲击侧面的换热特性.采用热色液晶瞬态测量技术测量通道内部各个面的传热系数,得到以下结论:靶面直接受到射流的第一次冲击,射流形成旋流对出流面进行第二次冲刷,对冲击侧面进行第三次冲刷;靶面受到冲击孔射流的直接冲击,因此换热最强;冲击侧面只受到旋流...

Heat transfer characteristics in an internal coolant passage with crossflow-induced swirl, impingement and film cooling holes

The effects of Reynolds number and bleeding ratio on heat transfer of impingement target surface,bleeding-hole surface and impingement channel side surface were investigated in large-scaled test models for the cooling passages in gas turbine blade.A transient liquid crystal technique was used to measure the local heat transfer coefficients of inner surfaces of impingement channel.The results show that,on impingement channel inner surfaces,the main causation of high heat transfer coefficient is caused by the...