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�������պ����ѧѧ�� 2011, Vol. 37 Issue (10) :1191-1195    DOI: CNKI:11-2625/V.20111013.1738.017
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Numerical investigation of impingement and heat transfer on inner surface of airfoil former cavity with film holes
Wu Hong, Liu Yusheng, Xu Guoqiang*
National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Numerical simulations of impingement and heat transfer in a static airfoil former cavity with film holes were performed on conditions at different Reynolds numbers. Flows of the vortex by impingement on heat transfer mechanism was analyzed on the inner surface of leading-edge. The numerical result shows: heat transfer enhancement on the area near film holes is higher than the average value of channel at the same Reynolds number and it increases slightly with the higher Reynolds number. Wavy area of vortex generated by impingement and cross-flow extends the scope of enhanced heat transfer greatly. Suction effect of film holes flow generates an impact on impingement and enlarges the covering area of cooling air on the inner surface of leading-edge furthermore. Vortex in the vertical section of the film chamber root hinders cooling air flowing there and results in a lower cooling efficiency. While vortex in the cross-section promotes the mixing of cold and hot air near the wall with an enhancement in heat transfer.
Keywords�� turbine blades   leading-edge   film   impinging   cooling   numerical analysis     
Received 2010-05-13;
Fund:

���ջ���������Ŀ(2008ZB51018)

About author: �� ��(1971-),��,�����ֳ���,������,wuhong@buaa.edu.cn.
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���, ��ԣʢ, ���ǿ.����Ĥ����ҶƬǰǻ�ڱ�����������ֵģ��[J]  �������պ����ѧѧ��, 2011,V37(10): 1191-1195
Wu Hong, Liu Yusheng, Xu Guoqiang.Numerical investigation of impingement and heat transfer on inner surface of airfoil former cavity with film holes[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(10): 1191-1195
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http://bhxb.buaa.edu.cn//CN/CNKI:11-2625/V.20111013.1738.017     ��     http://bhxb.buaa.edu.cn//CN/Y2011/V37/I10/1191
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