旋转状态下气膜冷却换热系数的实验  

Experiment of heat transfer coefficients of film cooling over a rotating blade

作　　者：赵振明[1] 吴宏伟[1] 丁水汀[1] 徐国强[1] 

机构地区：[1]北京航空航天大学能源与动力工程学院/航空发动机气动热力重点实验室,北京100083

出　　处：《推进技术》2008年第6期662-666,共5页Journal of Propulsion Technology

基　　金："凡舟"基金(20070401)

摘　　要：采用平板叶片模型，测量了静止和旋转状态气膜冷却换热系数（hg）的分布规律，重点研究旋转对气膜冷却换热系数的影响。测试表面气膜孔直径D=4mm，流向倾角α=30°，展向倾角φ=90°。实验转速ω=0，800r／min，主流雷诺数ReD=3191，吹风比M：0．4～2．0，密度比DR=1．02。采用宽幅低温液晶测量叶片表面的温度场。结果表明，旋转使得气膜在展向上发生较明显的偏转，且吸力面上气膜偏转程度要大于压力面；吹风比对换热系数的影响较大，且这种影响在静止与旋转状态差别很大。Measurements of heat transfer coefficient （hs） were presented for single film hole with a diameter of D = 4 mm in 30° inclined injection on a rotating flat form blade. Tests were conducted at the rotating speed （ω） of 0 r/min and 800 r/min, respectively. The mainstream Reynolds number based on the film hole diameter （ReD） was 3 191. The blowing ratio （M） was controlled to be from 0.4 to 2.0 while the density ratio （DR） of 1.02 was obtained with air injection. Thermochro- mic liquid crystal （TLC） was used to obtain the temperature distributions on the blade surface. The results show that an obvi- ous deflexion in the spanwise direction is occurred under rotating case and the deflexion angle on the suction surface is greater than that on the pressure surface; the blowing ratio performs great influence on the heat transfer coefficient, and the influences are different between the stationary and rotating cases.

关 键 词：气膜冷却 换热系数 旋转叶片 实验 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]