带肋横流进气方式下气膜孔的流阻特性与机理研究

发布时间：2018-02-28 18:12

本文关键词： 气膜冷却带肋横流流量系数吹风比横流雷诺数　出处：《推进技术》2016年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to better study the effect of the internal cooling structure on the flow resistance characteristics of the external gas film, the flow coefficient of the cylindrical film orifice was measured under the different cross flow Reynolds numbers (1 脳 10 ~ 5 ~ 5 ~ 5 ~ 5 脳 10 ~ (4)) and the blowing ratio of M ~ (0. 5) ~ (1) ~ (2) under the ribbed cross flow inlet mode. Combined with numerical simulation, the influence mechanism of cross flow Reynolds number 45 掳rib structure and blowing ratio on the flow resistance characteristics of gas film hole is analyzed. The results show that the flow in the hole caused by cross flow is the main factor to decrease the flow coefficient under the mode of cross flow inlet with ribs. At the same Reynolds number, the flow coefficient increases with the increase of the blowing ratio, and when the blowing ratio increases to 2:00, the flow coefficient tends to a certain value, and the flow coefficient tends to a certain value when the blowing ratio is increased to 2:00, and the flow coefficient tends to a certain value when the blowing ratio is smaller than M ~ (0.5) ~ (1), when the cross flow Reynolds number is the same, the flow coefficient decreases further. The larger the cross flow Reynolds number is, the smaller the flow coefficient is, and the effect of cross flow Reynolds number on flow coefficient decreases with the increase of blowing ratio.
【作者单位】：西北工业大学动力与能源学院;
【基金】：航空科学基金(2014ZB53023) 国家“九七三”基金(2013CB035702) 霍英东教育基金会资助项目(141053) 中央高校基本科研业务费专项资金(3102014JCQ01049)
【分类号】：V231.1

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