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�������պ����ѧѧ�� 2008, Vol. 34 Issue (02) :197-201    DOI:
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Effects of free stream local disturbance on delta wing aerodynamics
Zuo Linxuan, Wang Jinjun, Liu Yang*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The effects of free stream disturbance on micro air vehicle (MAV) aerodynamics was investigated using delta wings with disturbance introduced by an upstream cylinder in wind tunnel. The results indicate that the stall-delay happen when disturbance is introduced in the upstream of apex for both rigid and flexible delta wings, the stall-delay of rigid wing relates with wake flow of disturbing cylinder, the stall-delay for flexible wing not only relates with this but also with its vibration. Without disturbance or the disturbance introduced in the upstream of wing apex, the lift coefficient of flexible wing is larger than that of rigid one when attack angle is in the range of 4° to 18°, but the corresponding lift to drag ratio of flexible wing is smaller than that of rigid one. Because of the coupling among the vibrations of flexible wing, the flow structure and the aerodynamics, the dominant frequencies of flexible wing-s apex and tip vibration were changed regularly with the sweep angle increases. The dominant frequency of vibration for flexible wing tip is frequency of vortex shedding around stall angle.
Keywords�� delta wing   flexibility   free stream disturbance   aerodynamic performance   stall-delay     
Received 2007-02-06;


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Zuo Linxuan, Wang Jinjun, Liu Yang.Effects of free stream local disturbance on delta wing aerodynamics[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(02): 197-201
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