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Experimental investigation of rotation number effect on film cooling over a convex surface
Zhao Zhenming, Wu Hongwei, Ding Shuiting, Xu Guoqiang*
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ ����Բ��ģ��,��������ת״̬��͹������Ĥ��ȴЧ�� η ad�ͻ���ϵ�� h f�ķֲ�����,�ص��о���ת�� Rt=ωD/u ����Ĥ��ȴ��Ӱ��.ҶƬ�����¶Ȳ����Ƚ���Һ�����¼������в���.�������:������ת�������͸������Ĺ�ͬ������,��Ĥ�켣��߰뾶�����������Ե�ƫ��,����ת��Խ��ƫ�ƽǶ�Խ��;����תʹ����Ĥ��ȴЧ�ʽ���,����ϵ������;������ת״̬��,��Ĥ�����˷����ٸ��ڵ�����.
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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 �� an obviously deflection occurs under the rotating condition;�� with the increase of rotation number, the film cooling effectiveness decrease while the heat transfer coefficient increase;�� a reattachment phenomenon can be observed in the rotating condition.
Keywords�� film cooling   curved surface   rotating   experiment     
Received 2008-06-18;
About author: ������(1980-),��,������,��ʿ��,laozhao1980@163.com.
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������, ���ΰ, ��ˮ͡, ���ǿ.��ת����͹������Ĥ��ȴӰ���ʵ�����[J]  �������պ����ѧѧ��, 2009,V35(7): 838-841
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 A, 2009,V35(7): 838-841
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