Volume 34 Issue 10
Oct.  2019
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LI Chuang, DONG Ming. Impact of local cavities on evolution of the second-mode disturbances in hypersonic boundary layers[J]. Journal of Aerospace Power, 2019, 34(10): 2203-2210. doi: 10.13224/j.cnki.jasp.2019.10.013
Citation: LI Chuang, DONG Ming. Impact of local cavities on evolution of the second-mode disturbances in hypersonic boundary layers[J]. Journal of Aerospace Power, 2019, 34(10): 2203-2210. doi: 10.13224/j.cnki.jasp.2019.10.013
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Impact of local cavities on evolution of the second-mode disturbances in hypersonic boundary layers

doi: 10.13224/j.cnki.jasp.2019.10.013

  • Laboratory for High-Speed Aerodynamics,School of Mechanical Engineering,Tianjin University,Tianjin 300072,China

  • Received Date: 2019-04-19
  • Publish Date: 2019-10-28
    Abstract
  • The influence of local rectangular cavities on the evolution of the second-mode disturbances in a incoming Mach number 6.0 hypersonic boundary layer over a flat plate was investigated by using direct umerical simulation. The local scattering effect was quantified by a transmission coefficient defined as the ratio of perturbation amplitude downstream cavity to upstream cavity. It was found from the numerical results that, for a shallow cavity, thesecond-mode disturbance with a relatively low frequency was enhanced by the cavity, while the opposite was true when the frequency was high. In most of the cases, the transmission coefficient reduced with the increase of the cavity depth, implying a weaker enhancement or a stronger suppression effect. When the cavity depth exceeded a critical value, the dependence of the transmission coefficient on cavity depth was changed to a positive correlation, implying the emergence of a new regime. The critical depth relies on the disturbance frequency: it is larger for a lower frequency.

     

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