吹风比对旋转涡轮叶片气膜冷却的影响

对1.5级涡轮叶片在旋转状态下不同吹风比时的气膜冷却特性进行了实验研究.实验中基于动叶弦长的涡轮进口主流雷诺数为1.645 1×105,冷却工质采用二氧化碳,对应主流射流密度比为1.57,实验涡轮转速为475 r/min,对应旋转数为1.901,吹风比为0.5~2.0.采用稳态液晶方法测温.结果表明：①压力面上,随吹风...

Influence of blowing ratio on film cooling of rotating turbine blade

Experimental investigations were carried out to study the rotating film cooling characteristics at different blowing ratio in a 1.5-turbine stage. The mainstream Reynolds number Reg is 1.6451×105 in the experiment. CO2 acted as coolant with main-flow density ratio of 1.57. Turbine speed is the 475 r / min, and the rotation number is 1.901. The blowing Ratio varies from 0.5 to 2.0. By using steady-state liquid crystal method, the results show that on pressure side, the film cooling effectiveness and the coverage increase with blowing ratio increasing, and increasing blowing ratios M could lead the film trajectory to deflect less centrifugally. On suction side, the film cooling effectiveness and cooling coverage first increase and then decrease by increasing blowing ratio. Besides, the track of film has no obvious deflection. The film Movement curvature affects the adhesion of film on the wall.