Volume 21 Issue 6
Dec.  2006
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Article Navigation >  Journal of Aerospace Power  > 2006  >  21(6): 1037-1042
SI Hai-qing, WANG Tong-guang, ZONG Hui-Ying. Influence of the plate on the cavity flow-induced oscillations and the modification of the oscillation frequency equation[J]. Journal of Aerospace Power, 2006, 21(6): 1037-1042.
Citation: SI Hai-qing, WANG Tong-guang, ZONG Hui-Ying. Influence of the plate on the cavity flow-induced oscillations and the modification of the oscillation frequency equation[J]. Journal of Aerospace Power, 2006, 21(6): 1037-1042.
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Influence of the plate on the cavity flow-induced oscillations and the modification of the oscillation frequency equation

  • College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

  • Received Date: 2005-12-12
  • Rev Recd Date: 2006-03-26
  • Publish Date: 2006-12-28
    Abstract
  • A numerical solution of the three-dimensional URANS equation was presented using the fully implicit unfactored methods,where the turbulent coefficient was calculated based on the revised B-L turbulence model,and numerical simulations were implemented for supersonic three-dimensional open cavities.The self-sustained oscillatory motion of the shear layer was studied for plates with different lengths.The plate in the cavity isolates the shear layer and the cavity,and therefore reduces the coupling between the cavity pressure fluctuations and the shear layer.The oscillation of the shear layer decreases with the increase of the plate length.Based on the different characteristic lengths,Heller’s frequency equation was modified.The frequencies predicted by the modified equation agree with those by the close-box acoustic model;several comparisons demonstrate the validity of the modified equation.

     

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