入射角和射流孔位置对气膜冷却的影响

Effect of film cooling with different angle of incedence and different efflux hole position

采用标准k-ε两方程湍流模型对前缘上游不同入射角、不同位置孔排的涡轮叶栅通道的温度场进行了数值模拟,结果表明:对于不同入射角,90°入射角时冷却效果最差;对于不同孔排位置,孔排1的冷却效果差于孔排2和孔排3,但是差别不大;对于双排射流孔,在X/D=9之前的区域,2、3排孔的冷却效果最好,1、3排孔的冷却效果最差,在X/D=9之后的区域,1、3排孔的冷却效果最好,2、3排孔的冷却效果最差。

Standard κ-ε turbulence model is used to simulation the up steam advancing edge of different incidence angle, different position bore row＇s temperature field of the steam turbine cascade blade. It shows that among all the incidence angles the 90 degree＇s cooling performance is the worst;as to different position bore row the No. 1 bore row＇s cooling performance is worse than No. 2 or No. 3 bore row, there is litter difference among them;as to double eject bore row, before the X/D = 9 zone, the bore row 2 and bore row 3＇s cooling effect is the best, row1 and row 3 is the worst, after the X/D = 9 zone, there has an opposite cooling effect.