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An experimental study of transonic shock/boundary layer interactions subject to downstream pressure perturbations

机译：跨音速冲击/边界层相互作用受下游压力扰动影响的实验研究

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摘要

An experimental study of the response to downstream pressure perturbations of transonic shocks in a parallel walled duct has been conducted. Tests have been carried out for normal shock strengths of M_∞ = 1.4 and 1.5 with pressure perturbation frequencies in the range 16-90 Hz. The measurement techniques of high speed schlieren photography, laser Doppler anemometry and high frequency pressure measurements have been used. In all test cases, the normal shock undergoes periodic oscillatory motion in the streamwise direction. The interaction structure between the oscillating shock and the tunnel wall turbulent boundary layer varies during oscillations, especially at M_∞ = 1.4, where the leading shock-leg of the lambda shock-foot structure gets significantly stronger during upstream shock motion and weaker during downstream motion. These changes are related to the relative strength of the shock (which varies due to the velocity of shock motion) and the effect that this has on the extent of boundary layer thickening and/or shock induced boundary layer separation. The dominant mechanism that governs the dynamics of shock motion in response to downstream pressure perturbations has also been identified and explains why the amplitude of shock motion decreases with increasing frequency.
机译：进行了对平行壁导管中跨音速冲击的下游压力扰动响应的实验研究。在压力扰动频率范围为16-90 Hz的情况下，已针对M_∞= 1.4和1.5的正常冲击强度进行了测试。已经使用了高速schlieren摄影，激光多普勒风速仪和高频压力测量的测量技术。在所有测试案例中，法向冲击都沿流向经历周期性的振荡运动。振荡过程中，振荡激波与隧道壁湍流边界层之间的相互作用结构会发生变化，尤其是在M_∞= 1.4时，λ激波脚结构的前激波腿在上游激波运动中明显增强，而在下游运动时减弱。这些变化与冲击的相对强度（由于冲击运动的速度而变化）以及边界层增厚和/或冲击引起的边界层分离程度有关。还已经确定了响应于下游压力扰动而控制冲击运动动力学的主要机制，并解释了为什么冲击运动的幅度随频率增加而减小。

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  • 来源
    《Aerospace science and technology》 |2010年第2期|134-142|共9页
  • 作者

    P.J.K. Bruce; H. Babinsky;

  • 作者单位

    Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK;

    Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    unsteady; transonic SBLI;

    机译：不稳定跨音速SBLI;

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