Volume 39 Issue 6
Jun.  2013
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Lai Guojun, Shen Gongxin. Revolution of flow structures around model wing of dragonflies in hovering flight[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, (6): 711-716. (in Chinese)
Citation: Lai Guojun, Shen Gongxin. Revolution of flow structures around model wing of dragonflies in hovering flight[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, (6): 711-716. (in Chinese)

Revolution of flow structures around model wing of dragonflies in hovering flight

  • Received Date: 24 May 2012
  • Publish Date: 30 Jun 2013
  • To study the three dimensional flow structures around a single flapping wing of dragonflies in hovering flight for future experimental comparison with flow structures around a fore- or hind wing of dragonflies, an electromechanical flapping mechanism mounted with a model wing was used to simulate the flapping motion of a dragon wing in this experiment. Three dimensional instant flow fields around the flapping wing were measured respectively at two downstroke phases (t=0.25T,0.375T) and two upstroke phased (t=0.75T,0.875T) with the digital stereo particle image velocimetry (DSPIV) and the multi-slice phase-locked technique. Three dimensional vortex structures were visualized with the local vortex identification scheme. It also was presented that the contour lines of z component of vorticity in each spanwise measuring plane, the vortex core position of the leading edge vortex (LEV) with respect to the upper wing surface and LEV sectional circulation at each spanwise measuring position. The results show that the revolution of the three-dimensional flow structures around the dragonfly wing during its stroking.

     

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