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Volume 42 Issue 4
Apr.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(4): 837-843.
XUE Dong, PAN Chong, LI Guangchaoet al. Frequency measurement of wing-tip vortex instability by flow visualization[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(4): 837-843. doi: 10.13700/j.bh.1001-5965.2015.0594(in Chinese)
Citation: XUE Dong, PAN Chong, LI Guangchaoet al. Frequency measurement of wing-tip vortex instability by flow visualization[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(4): 837-843. doi: 10.13700/j.bh.1001-5965.2015.0594(in Chinese)
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Frequency measurement of wing-tip vortex instability by flow visualization

doi: 10.13700/j.bh.1001-5965.2015.0594

  • Fluid Mechanics Key Laboratory of Education Ministry, School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:  Aeronautical Science Foundation of China (2013ZC51030)
  • Received Date: 10 Sep 2015
  • Rev Recd Date: 30 Oct 2015
  • Publish Date: 20 Apr 2016
    Abstract
  • The accurate measurement of the dominant frequency of wing-tip vortex core oscillation is essential for controlling the wing-tip vortex. In the present study, the instability of wing-tip vortex, which is generated from an elliptical wing, was investigated under low Reynolds number via flow visualization technique. Point-wise spectrum method and dynamic mode decomposition were applied to extract the dominant frequency of the short-wave instability of the wing-tip vortex core from the flow visualization image sequence, and the maximum relative error of these two methods is less than 5%. The results show that short-and long-wave instability modes are developed simultaneously among the vortex pair; the high-frequency vortex core oscillation is coupled with the slow side-to-side movement of vortex tube, and the former is the main energy mode; the non-dimensional frequency of the short-wave instability increases with the increase of Reynolds number, and decreases with the angle of attack increasing.

     

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