Passive control of shock wave–boundary-layer interactions

斜激波 边界层 冲击波 机械 物理 马赫数 休克(循环) 移动冲击 光学 稀薄(生态学) 马赫波 边界层控制 边界层厚度 地质学 医学 古生物学 物种丰富度 内科学
作者
Gibson Tm,Holger Babinsky,L. C. Squire
出处
期刊:Journal of the Royal Aeronautical Society [Cambridge University Press]
卷期号:104 (1033): 129-140 被引量:14
标识
DOI:10.1017/s000192400002532x
摘要

Abstract The passive control of a shock wave-boundary-layer interaction involves placing a porous surface beneath the interaction, allowing high pressure air from the flow downstream of the shock wave to recirculate through a plenum chamber into the low pressure flow upstream of the wave. The simple case of a normal shock wave at a Mach number of 1·4 interacting with the turbulent boundary layer on a flat wall is investigated both experimentally and numerically. The experimental investigation made use of holographic interferometry, while the computational section of the investigation made use of a Navier-Stokes code to derive pressure gradients, boundary-layer properties and total pressure losses in the interaction region. It is found that the structure of shock wave-boundary-layer interactions with passive control consists of a leading, oblique shock wave followed by a lambda foot. The oblique wave originates from the upstream end of the porous region, and its strength is determined by the magnitude of the local blowing velocities. The shape of the lambda foot depends on the position of the main shock relative to the control region, resembling an uncontrolled foot when the main shock wave is towards the downstream end of the porosity, but becoming increasingly large as the shock moves upstream and eventually merging with the leading, oblique shock to form a single, large, lambda structure. Improved forms of passive control are suggested based on the findings of this investigation, including the use of passive control systems which incorporate streamwise variations in the level of porosity.
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