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

被引：0
|
作者：
Wang Y. [1 ]
Liu J. [2 ]
Wang X. [1 ]
Li X. [1 ]
机构：
[1] Aviation University of Air Force, Changchun
[2] School of Mechanical Engineering, Tianjin University, Tianjin
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 22期
基金：
中国国家自然科学基金;
关键词：
bi-global stability analysis; optimal disturbance; parabolized stability equation; porous wall; subcritical transition;
D O I：
10.7527/S1000-6893.2023.28519
中图分类号：
学科分类号：
摘要：
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. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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