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�������պ����ѧѧ�� 2009, Vol. 35 Issue (7) :783-785    DOI:
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Unsteady drag measurements for flow over a circular disk
Hu Ye, Wang Jinjun*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ �Դ�ֱ�����������Բ�̽��зǶ�������ʵ��,�о����ζ�ά����Բ�˺�Բ��������ŵ��(��ŵ����ΧΪ0.44×105~2.74×105)��Բ�����������������Ե�Ӱ��.ʵ��������,�����������θ���,Բ��ƽ������ϵ����������ŵ���ı�.���θ���Բ���ڽ���Բ������ϵ����ͬʱ,ʹԲ����������������,���ҵ�Բ��������ŵ������1.84×105ʱ����������������������ŵ���ļӴ��Ѹ������.��Բ��������Ƶ�׷�������,��Բ�������޸���ʱ,Բ�������γɵ�����״������ķ���ԳƲ���Ƶ��(˹���͹�����Ϊ0.135)Ϊ������������Ƶ.
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Abstract�� Unsteady drag measurements were conducted in a low speed wind tunnel to investigate the drag of the circular disk which was normal to the flow. The circular disk was interfered by an upstream two-dimensional rod in the horizontal symmetry plane of the disk in the Reynolds number range from 0.44×105 to ��2.74×��105 based on the disk diameter. The results indicate that the mean drag coefficient of the circular disk does not depend on the Reynolds number which was tested in present study, no matter there is an interference rod upstream of the circular disk or not. Meanwhile, the interference rod leads to decrease of the mean drag coefficient and increase of the drag fluctuation of the circular disk. The increment value of the drag fluctuation increases rapidly, when the Reynolds number is beyond 1.84×105. By the frequency analysis, the dominate frequency of the disk drag without the interference rod corresponds to the antisymmetric fluctuation frequency induced by the helical vortex structure(the Strouhal number is 0.135).
Keywords�� disk   drag   flow interaction   drag reduction   frequency response     
Received 2008-06-05;
Fund:

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About author: �� ��(1984- ), Ů, �����Ž���, ��ʿ��, 32050314@ase.buaa.edu.cn.
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Hu Ye, Wang Jinjun.Unsteady drag measurements for flow over a circular disk[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(7): 783-785
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