外缘轴向进气的旋转空腔主盘平均换热特性研究

A STUDY ON AVERAGED HEAT TRANSFER CHARACTERISTICS OF A ROTATING CAVITY WITH AXIAL FRINGE INFLOW

某型发动机的涡轮盘腔冷却结构被简化成外缘轴向进气的旋转空腔模型，以实验方法研究了旋转雷诺数（Ｒｅω）、冷气雷诺数（Ｒｅｚ）、哥拉晓夫数（Ｇｒ＊）对主盘平均换热特性的影响。实验发现，主盘平均换热系数随冷气雷诺数的增大而增加，随旋转雷诺数的增加而下降，随哥拉晓夫数的增加而增加。根据实验结果给出了计算主盘表面平均对流换热系数的经验关系式。

A turbine cooling configuration of an aero-engine was simplified to a rotating cavity with an axial fringe inlet and a radial outlet.The influences of rotating Reynold number,cooling air Reynold number and Grashoff number on the averaged heat transfer characteristics were experimentally investigated.The experiment indicated that the averaged heat transfer coefficient on the main disk increases with the increase of cooling air Reynold number and Grashoff number,and decreases with the increase of rotating Reynold number.An experimental correlation of the averaged heat transfer coefficient on the main surface is formulated.