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�������պ����ѧѧ�� 2009, Vol. 35 Issue (4) :439-443    DOI:
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Frequency characteristics of breakdown vortices over delta wings with small amplitude oscillation at the high angle of attack
Zhang Minglu, Liu Shaohui,Lü Zhiyong*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Experiments of dynamic unsteady pressure measurement and hot film velocity measurement with the small amplitude oscillation delta wings were carried out in a water channel and a wind tunnel respectively in order to investigate the influence of the nondimensional oscillation frequency n on the frequency characteristics of leading-edge vortices over delta wings. Power spectral analysis of pressure signal measured in the wind tunnel shows that at n =0.018~0.036, which is close to the oscillation frequency of vortex breakdown point, resonant phenomenon will happen and oscillatory energy will be largely enhanced. Power spectral analysis of velocity signal measured in the water channel shows that at n =0.8~1.38, which is close to the propagation frequency of spiral wave, the vortex breakdown point moves towards trailing edge, and therefore breakdown of vortices will be delayed and the dominant frequency will be increased.
Keywords�� delta wing   small amplitude   oscillation   frequency     
Received 2008-04-11;
Fund:

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About author: ����»(1979-),��,�Ĵ���üɽ��,��ʿ��,zscems@sina.com.
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����», ���ܻ�, ��־ӽ.��ӭ����С����������������е�Ƶ������[J]  �������պ����ѧѧ��, 2009,V35(4): 439-443
Zhang Minglu, Liu Shaohui,L�� Zhiyong.Frequency characteristics of breakdown vortices over delta wings with small amplitude oscillation at the high angle of attack[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(4): 439-443
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