密度比对涡轮叶片气膜孔流量系数的影响
Influence of density ratio on the discharge coefficient of turbine blade film cooling holes
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摘要: 试验测量了某涡轮工作叶片表面不同位置气膜孔在不同密度比、吹风比和雷诺数下的流量系数,分析了各种因素对流量系数的影响程度,重点研究了二次流-主流密度比对流量系数的影响。试验结果表明:(1)密度比对不同位置气膜孔流量系数的影响也有差别:在吸力面、前缘等位置密度比对气膜孔流量系数影响较大;在压力面密度比对气膜孔流量系数影响较小。(2)以往采用空气作为主流及二次流,在低温差下进行试验所获的流量系数在用于涡轮叶片气膜冷却的实际情况时,必须进行修正。Abstract: Discharge coefficients of the film cooling holes were investigated using a large-scale low speed turbine cascade.Discharge coefficients with coolant injection were determined at different density ratio,blowing ratio and Reynolds number.The results show that the influence of density ratio of secondary flow to mainstream flow on discharge coefficients of the film cooling holes is different at different hole array position.The effect of density ratio on suction surface and leading edge is more evident.The data of turbine blade surface film holes discharge coefficients obtained from experiments with small difference in temperature of the secondary and mainstream airflow should be corrected when it was attempted to apply to practice.
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Key words:
- aerospace propulsion system /
- turbine blade /
- film cooling /
- density ratio /
- experiment /
- discharge coefficient
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[1] Hay N,Lampard D,Benmansour S.Effects of crossflows on the discharge coefficient of film cooling holes[J].ASME Journal of Engineering for Power,1983,105:243-374. [2] Hay N,Henshall S E,Manning A.Discharge coefficient of holes angled to the flow direction[J].ASME Journal of Turbomachinery,1994,116:358-368. [3] Hay N,Spencer A.Discharge coefficient of film cooling holes with radiused and chamfered inlets[R].ASME Paper No.91-GT-269,1991. [4] Petersen D R,Eckert E R G,Goldstein R J.Filming cooling with large density differences between the mainstream and secondary fluid measured by heat-mass transfer analogy[J].ASME Journal of Heat Transfer,1997,99:620-627. [5] 朱惠人,许都纯,刘松龄.气膜孔形状对流量系数影响的实验研究[J].推进技术,1998,19(1):42-45.Zhu Huiren,Xu Duchun,Liu Songling.The experimental investigation in the effects of film cooling holes shape on discharge coefficient[J].Journal of Propulsion Technology,1998,19 (1):42-45. [6] 向安定,朱惠人,刘松龄,等.涡轮导向叶片表面气膜孔流量系数的实验研究[J].推进技术,2003,24(3):216-218.Xiang Anding,Zhu Huiren,Liu Songling,et al.Discharge coefficient measurements for film cooling holes on blade surface in a turbine cascade[J].Journal of Propulsion Technology,2003,24(3):216-218. [7] 许都纯,刘松龄,游绍堃,等.低速大尺寸传热风洞的研制[J].推进技术,1997,18(2):61-64.Xu Duchun,Liu Songling,You Shaokun,et al.Setting-up and investigation of a large-scale low-speed heat-transfer wind tunnel[J].Journal of Propulsion Technology,1997,18(2):61-64.
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