摘要
对非定常环境下动叶气膜冷却的流场进行了数值模拟,研究了动静部件之间非定常效应对气膜冷却效率的影响.计算结果表明,静叶的尾流迁移在冷气喷射位置处时,冷气在喷射位置下游壁面附近的覆盖宽度增大,距喷射位置下游约30%弧长范围内具有较高的气膜冷却效率,但在喷射位置附近的冷却效果略差一些.气膜冷却效率的振荡幅度随着吹风比的增大而增大.由于端壁附近旋涡的影响,冷气很难到达端壁附近,而是被卷吸到喷射位置的下游去,在喷射位置下游靠近端壁附近的冷却效果更好一些.
The unsteady flowfield of the turbine blade film cooling was investigated numerically, and the influence of unsteady stator/rotor interaction on the blade film cooling effectiveness was discussed. Results show that, the overlying width of the cooling jet flow in creases near the downstream of the cooling jet position, when the stator wake is transferred to the cooling jet position, resulting in better film cooling effectiveness at the downstream within 30% arc length range. The fluctuation of the film cooling effectiveness increases with the increment of the blowing rate. Due to the influence of the vortex near the endwall, the cooling jet flow can hardly reach the endwall region, but be entrained to the downstream of the jet position, so the cooling effectiveness is improved correspondingly.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2011年第8期1695-1701,共7页
Journal of Aerospace Power
基金
国家自然科学基金(50906071)
西北工业大学基础研究基金(JC201011)
西北工业大学翱翔之星项目
关键词
动叶气膜冷却
非定常效应
气膜冷却效率
尾流
端壁
turbine blade film cooling
unsteady interaction
film cooling effectiveness
wake
endwall
