Volume 36 Issue 12
Dec.  2021
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WEI Xianjie, LONG Wei, LEI Jilin, XIN Xiaocheng, GAO Hao. Stability analysis on flow field within taper tube of pneumatic measuring instrument in relation to buoy[J]. Journal of Aerospace Power, 2021, 36(12): 2621-2630. doi: 10.13224/j.cnki.jasp.20210040
Citation: WEI Xianjie, LONG Wei, LEI Jilin, XIN Xiaocheng, GAO Hao. Stability analysis on flow field within taper tube of pneumatic measuring instrument in relation to buoy[J]. Journal of Aerospace Power, 2021, 36(12): 2621-2630. doi: 10.13224/j.cnki.jasp.20210040
shu

Stability analysis on flow field within taper tube of pneumatic measuring instrument in relation to buoy

doi: 10.13224/j.cnki.jasp.20210040
  • 1.

    Faculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，China

  • 2.

    Yunnan Province Key Laboratory of Engines，Faculty of Transportation Engineering，Kunming University of Science and Technology，Kunming 650500，China

  • Received Date: 2020-01-26
  • Publish Date: 2021-12-28
    Abstract
  • The problem of flow around the buoy was analyzed.It was found that the tail turbulence and vortices were caused when the flow passed through the buoy from bottom to top.As the vortex moved and fell off，the turbulent flow field showed fluctuating pressure acting on both sides of the buoy in an alternating form，causing the buoy to swing from side to side and the indicator to be unstable.Further，a guide surface with length and angle was added at the tail of the buoy to reduce the influence of tail-vortex by draining the flow field at the tail.At the same time，the local air resistance in the drainage guide area was enhanced to improve the working stability of the buoy.The results showed that when the length of the guide surface increased to 2 mm，the airflow stiffness of the buoy and the inner wall of the glass pipe increased，and the deflection angle of the buoy decreased from 8° to 0.5°.When the angle of the guide surface exceeded 10°，a relatively low pressure area appeared and the deflection angle exceeded 15° due to the influence of the Cornda effect.

     

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