多孔壁面对高速边界层最优增长条带二次失稳的影响规律

doi:10.7527/S1000-6893.2023.28519

Abstract

Abstract:

Boundary layer transition is a key fundamental theoretical problem in the design of hypersonic vehicles. High intensity environmental disturbances leads to subcritical transition upstream of the mode instability region， triggered by secondary instability of optimal growth streaks. To assess the effect of the porous wall on the subcritical transition， this paper studies both super/hypersonic flat-plate boundary layer flows. Based on the adjoint parabolized stability equations， an optimization system as well as a numerical method is developed. The three-dimensional boundary layer flow with streaks resulted from the optimal disturbances of nonlinear evolution is used as the new base flow for the bi-global stability analysis. The result shows that， the secondary instability modes in the frequency range of the second modes are stabilized by the porous wall， while those in the frequency range of the first modes are destabilized， with the turning frequency close to the local synchronization frequency. Such regularity is helpful for the arrangement of porous coating in engineering applications.

Key words: subcritical transition, optimal disturbance, bi-global stability analysis, porous wall, parabolized stability equation

CLC Number:

V211

Yutian WANG, Jianxin LIU, Xiaokun WANG, Xiaoming LI. Effects of porous wall on secondary instability of optimal growth streaks in high speed boundary layers[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(22): 128519-128519.

Figures/Tables 15

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Effects of porous wall on secondary instability of optimal growth streaks in high speed boundary layers

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