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�������պ����ѧѧ�� 2008, Vol. 34 Issue (10) :1204-1209    DOI:
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��־ǿ, �� ��, �� ��*
�������պ����ѧ ���շ��������������ص�ʵ����, ���� 100191
Numerical simulations of flame tube cooling structure with multi-jet holes
Li Zhiqiang, Tian Tao, Chen Qin*
National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The numerical simulation was used to study the film cooling effectiveness of plate with multi-inclined jet hole. The effect of the blowing ratio, oblique angle of the hole, array way of the hole, compound angle and shape of jet holes was investigated for increasing cooling efficiency. The computational results show that the blowing ratio and the oblique angle of the hole have important influence for the cooling efficiency. With the increase of the blowing ratio, the cooling efficiency increases, but the trend of increase is decreasing. And with the decrease of the oblique angle of the hole, the high cooling efficiency can be gained. The array way of the holes has a certain effect on the cooling efficiency, i.e. long diamond distribution is better than the regular diamond distribution. Also, the computational results show the introduction of the hole offset angle in the ��y�� direction is unfavorable for cooling. In addition, compared with cylinder holes, when the holes with the cone contractive entrance and the cone outspread exit are used, it is found that the cooling efficiency can be improved with low blowing ratio, and the cooling efficiency is inferior with high blowing ratio.
Keywords�� flame tube   multi-jet hole film cooling   film cooling efficiency   shaped hole   cylinder hole     
Received 2007-10-18;
About author: ��־ǿ(1970-),��,ɽ��������,������,lizhiqiang@buaa.edu.cn.
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��־ǿ, �� ��, �� ��.��б�׻���Ͳ����ȴ�ṹ����ֵģ��[J]  �������պ����ѧѧ��, 2008,V34(10): 1204-1209
Li Zhiqiang, Tian Tao, Chen Qin.Numerical simulations of flame tube cooling structure with multi-jet holes[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(10): 1204-1209
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