论文部分内容阅读
基于压力敏感漆(PSP)实验技术研究了具有双射流、圆孔和扇形孔的气膜冷却系统在主流湍流度为6%,吹风比分别为0.5,0.8,1.0,1.2和1.5时的冷却特性.圆孔平均气膜冷却效率在吹风比为0.8到1.5范围内逐渐降低;而双射流和扇形孔在整个实验范围内随吹风比的增大而升高,这表明双射流很好地抑制了射流与壁面的吹离.在同等条件下,双射流气膜冷却效率优于圆孔,而低于扇形孔.实验条件下的数值模拟结果清楚地表明了圆孔、双射流和扇形孔分别形成的肾形涡系、反肾形涡系和弱肾形涡系是形成各自气膜冷却特性的主要因素.
Based on pressure-sensitive paint (PSP) experimental technique, the cooling characteristics of the film cooling system with double jets, round holes and fan holes were studied when the main flow turbulence was 6% and the blowing ratio was 0.5,0.8,1.0,1.2 and 1.5, respectively . The average film cooling efficiency of the round hole decreases gradually with the blowing ratio from 0.8 to 1.5, while the double jets and the fan holes increase with the blowing ratio in the whole experimental range, which shows that the double jet is well restrained Jet and wall blow-off.Under the same conditions, the cooling efficiency of the double-jet film is better than the circular hole and lower than the fan-shaped hole.The numerical simulation results under the experimental conditions clearly show that the circular hole, the double jet and the fan hole are formed separately The kidney-shaped vortex system, the anti-kidney vortex system and the weak kidney-shaped vortex system are the main factors that form the respective film cooling characteristics.