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为了更好地研究内冷结构对外部气膜孔流阻特性的影响,在带肋横流进气方式下,实验测得不同横流雷诺数(Rec=1×10~5,5×10~4)和吹风比(M=0.5,1,2)下的圆柱型气膜孔流量系数,并结合数值模拟分析了横流雷诺数、45°肋结构和吹风比对气膜孔流阻特性的影响机理。结果表明:带肋横流进气方式下,横流引起的孔内旋流是流量系数减小的主要因素,肋引起的进口堵塞使得流量系数进一步减小;横流雷诺数相同时,流量系数随吹风比的增大而增大,当吹风比增大至M=2时,流量系数趋于一定值;小吹风比(M=0.5~1)时,横流雷诺数越大流量系数越小,随吹风比的增大(M=1~2),横流雷诺数对流量系数的影响逐渐减小。
In order to better study the influence of the internal cooling structure on the flow resistance characteristics of the outer film, the cross-flow Reynolds numbers (Rec = 1 × 10 ~ 5 and 5 × 10 ~ 4) (M = 0.5, 1, 2), and analyzed the influence mechanism of cross flow Reynolds number, 45 ° rib structure and blowing ratio on the film flow resistance characteristics of the gas film combined with numerical simulation. The results show that the swirling flow in the hole caused by cross flow is the main factor of the flow coefficient decreasing with the ribbed cross-flow intake. The flow coefficient decreases further with the inlet blockage caused by the rib. When the cross-flow Reynolds number is the same, the flow coefficient increases with the blowing ratio (M = 0.5 ~ 1), the larger the cross flow Reynolds number is, the smaller the flow coefficient is, and the smaller the blowing coefficient is, the more the blowing coefficient increases to M = 2. (M = 1 ~ 2). The influence of cross-flow Reynolds number on flow coefficient decreases gradually.