| 旋转数对凸表面气膜冷却影响的实验分析 |
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| 引用本文： | 赵振明,吴宏伟,丁水汀,徐国强.旋转数对凸表面气膜冷却影响的实验分析[J].北京航空航天大学学报,2009,35(7):838-841. |
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| 作者姓名： | 赵振明 吴宏伟 丁水汀 徐国强 |
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| 作者单位： | 北京航空航天大学,能源与动力工程学院,北京,100191;北京航空航天大学,能源与动力工程学院,北京,100191;北京航空航天大学,能源与动力工程学院,北京,100191;北京航空航天大学,能源与动力工程学院,北京,100191 |
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| 摘 要： | 采用圆弧模型,测量了旋转状态下凸表面气膜冷却效率 η ad和换热系数 h f的分布规律,重点研究旋转数 Rt=ωD/u∞ 对气膜冷却的影响.叶片表面温度采用先进的液晶测温技术进行测量.结果表明:①在旋转离心力和哥氏力的共同作用下,气膜轨迹向高半径方向发生了明显的偏移,并且转速越高偏移角度越大;②旋转使得气膜冷却效率降低,换热系数上升;③在旋转状态下,气膜发生了分离再附壁的现象.
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| 关 键 词： | 气膜冷却 曲率 旋转 实验 |
| 收稿时间： | 2008-06-18 |
Experimental investigation of rotation number effect on film cooling over a convex surface |
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| Zhao Zhenming,Wu Hongwei,Ding Shuiting,Xu Guoqiang.Experimental investigation of rotation number effect on film cooling over a convex surface[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(7):838-841. |
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| Authors: | Zhao Zhenming Wu Hongwei Ding Shuiting Xu Guoqiang |
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| Institution: | School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | Experimental study was conducted to investigate the influence of rotation number (Rt = ωD/ u_∞ ) on the film cooling performance over a convex surface. Measurements of film cooling effectiveness η_(ad) and heat transfer coefficient h_f were presented for single film hole. Thermochromic liquid crystal (TLC) was used to obtain the temperature distributions on the curved surface. The results show that ① an obviously deflection occurs under the rotating condition; ② with the increase of rotation number, the film cooling effectiveness decrease while the heat transfer coefficient increase; ③ a reattachment phenomenon can be observed in the rotating condition. |
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| Keywords: | film cooling curved surface rotating experiment |
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