关键词: 涡轮叶片;叶片尾缘;气膜冷却;对流换热系数

Abstract: In order to study the film convection coefficient of blade trailing edge, three kinds of trailing edges were designed, and the experimental system was built. The convection coefficient of trail edges was studied by the experimental method with infrared cameras. The experimental results show that there is a large difference for the film convection coefficient of three kinds of trailing edges, and there is a largest convection coefficient value for the test piece I, and the situation of the largest value on the surface of trailing edge is moved with the change of the blowing ratio. The convection coefficient of test piece II and III are all gradually decreased alone the surface of trailing edge. At the same situation on the surface of trailing edge, the convection coefficient of test piece III is higher than the other test pieces, so the configuration of test piece III is suitable for the design of turbine blade trailing edge. 

Key words: Turbine blade；Trailing edge；Film cooling；Convection coefficient