Zhao Libin, Long Liping, Cai Qingyunet al. Dynamic properties of noise barrier structure subjected to train-induced impulsive wind pressure[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(4): 505-508. (in Chinese)
Citation: Zuo Linxuan, Wang Jinjun, Liu Yanget al. Effects of free stream local disturbance on delta wing aerodynamics[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(02): 197-201. (in Chinese)

Effects of free stream local disturbance on delta wing aerodynamics

  • Received Date: 06 Feb 2007
  • Publish Date: 29 Feb 2008
  • 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.

     

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