液晶测温法对平板气膜冷却的实验研究

徐国强; 田宁; 陶智; 丁水汀; 罗翔; 邓宏武

液晶测温法对平板气膜冷却的实验研究

北京航空航天大学航空发动机气动热力重点实验室, 北京 100083

基金项目: 新世纪优秀人才支持计划资助(NCET-05-0189);博士点基金资助(200604114)

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出版历程
- 收稿日期: 2006-05-08
- 修回日期: 2006-12-05
- 刊出日期: 2007-05-28

Experimental research on flat surface film cooling by TLC

National Key Laboratory on Aero-engines, Beijing University of Aeronauticsand Astronautics, Beijing 100083, China

摘要

摘要: 采用热色液晶测温法, 对沿流向倾角30°的圆孔排平板气膜冷却进行了实验研究.测量了绝热壁温、壁温等温度场.研究了吹风比、孔排等因素对气膜冷却效果和换热系数的影响.结果表明:吹风比对气膜冷却效果的影响很大, 冷却效果随吹风比的增大而降低;圆孔气膜冷却效果沿横向位置波动较大, 孔之间容易形成冷却死区.利用液晶测温技术可以很好地反映气膜冷却区域及冷却效果等.
- 航空、航天推进系统 /
- 平板气膜冷却 /
- 吹风比 /
- 热色液晶 /
- 冷却效果
Abstract: The performance of flat surface film cooling with 30° film cooling holes along streamwise was experimentally investigated using thermal liquid crystal.The temperature fields of adiabatic wall and conductive wall were measured.The effects of blow ratio and rows on film cooling effectiveness and heat transfer coefficient was studied.The results show that:blow ratio is a main influential factor to the film cooling effectiveness,the film cooling effectiveness decreases with the increasing of blow ratio;the film cooling effectiveness of discrete holes fluctuate dramatically across the transverse section,and dead zone is prone to occur between two discrete holes.TLC technique can be successfully applied to reflect film cooling effectual area and cooling effect.
- aerospace propulsion system /
- film cooling /
- blow ratio /
- TLC(thermal liquid crystal) /
- effectiveness

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参考文献(3)

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[2]	刘登瀛,葛绍岩,杨雅贤,等.气膜冷却平板换热系数的实验研究[J].工程热物理学报,1980,1(4):16-20.LIU Dengying,GE Shaoyan,YANG Yaxian,et al.Experimental study of heat transfer coefficient of flat surface film cooling[J].Journal of Thermal Engineering,1980,1(4):16-20.
[3]	Nasir H,Ekkad S V,Acharya S.Effect of compound angle injection on flat surface film cooling with large streamwise injection angle[J].Experimental Thermal and Fluid Science,2001,25:23-29.