气膜内冷通道高度对气膜孔流量系数的影响

毛军逵; 胡博; 苏云亮; 郭文

气膜内冷通道高度对气膜孔流量系数的影响

1.
南京航空航天大学能源与动力学院,南京 210016
2.
上海飞机设计研究院动力燃油设计研究部,上海 200232
3.
中国航空工业集团公司中国燃气涡轮研究院涡轮室,成都 610500

基金项目: 航空推进技术验证计划

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出版历程
- 收稿日期: 2010-02-23
- 修回日期: 2010-10-04
- 刊出日期: 2011-03-28

Experimental study of the discharge coefficient of film outflow varying with the internal cooling channel’s height

1.
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
2.
Power and Fuel System Design Department, Shanghai Aircraft Design and Research Institute,Shanghai 200232,China
3.
The Gas Turbine Department,China Gas Turbine Establishment, Aviation Industry Corporation of China,Chengdu 610500,China

摘要

摘要: 以一种基于旋流增益的强化换热技术为研究对象,对狭小受限的气膜孔内冷通道中气膜孔的流量系数开展了试验研究.试验中通过改变气膜孔雷诺数Re(4800~26000)、吹风比M(0.36~2.74)、无量纲冷却通道高度h/d(0.33~2.0)等参数,研究了狭小空间的几何结构、流动参数等对单排气膜孔平均流量系数C_d的影响,并得到了相关的经验准则关系式.试验发现:在主流雷诺数不变的工况下,随着气膜孔雷诺数的增加,流量系数逐步增加.在给定气膜孔雷诺数下,随着吹风比M的变大,气膜孔流量系数逐步增大.当h/d减小后,气膜孔流量系数随之逐渐降低.当气膜孔雷诺数大于9500时,h/d的变化对气膜孔流量系数的影响尤为显著.
- 气膜冷却 /
- 流量系数 /
- 内冷通道 /
- 受限空间 /
- 旋流
Abstract: According to the heat transfer enhancement with vortex,experiments were performed to investigate the discharge coefficient of film outflow in narrow confined space,which the ratio of the internal cooling channel height to the diameter of film cooling hole (h/d) was smaller than 1.In experiments,the rules of discharge coefficient C_d varying with the film cooling hole Reynolds number (4800~26000),blowing rate M(0.36~2.74),dimensionless of film cooling channel height h/d(0.33~2.0)were studied in detail,and the similarity criteria for discharge coefficients varying with these parameters were concluded.The experimental results show that the film cooling hole discharge coefficient increase with the film cooling hole Reynolds number when the main flow Reynolds number is constant.In the constant film cooling hole Reynolds number cases,C_d increase with the blowing rate M rising especially when M is smaller than 1.It is also found in experiments that the C_d decrease with dimensionless of film cooling channel height h/d increasing,especially in the cases which the film cooling hole Reynolds number is larger than 9500.
- film cooling /
- the discharge coefficient /
- internal cooling channel /

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参考文献(13)

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