Structure and Unsteadiness of Swept-Ramp Shock Wave/Turbulent Boundary Layer Interactions
Structure and Unsteadiness of Swept-Ramp Shock Wave/Turbulent Boundary Layer Interactions
复制标题
扫掠斜坡冲击波/湍流边界层相互作用的结构和不稳定性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
N. Clemens
中科院分区：
文献类型：
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作者：
L. Vanstone;N. Clemens
本文研究了马赫数为2的后掠压缩坡道产生的三维激波/湍流边界层相互作用的流动结构和大尺度不稳定性。用50 kHz粒子图像测速仪(PIV)研究了侧视平面和平面平面上的非定常流动。对50 kHz的PIV速度数据进行了带通滤波，以研究驱动大尺度不稳定的潜在机制。我们的分析表明，在低于10 kHz(0.25U∞/δ99)的频率范围内，上游边界层中的速度波动与分离线代理的运动之间存在很强的相关性。这一频带与边界层超结构的特征频率范围有很好的相关性。高频段(10-50 kHz)的分离流运动似乎与上游流动没有很强的相关性，相反，与分离区内主要沿横流方向移动的结构有显著的相关性。
In this study we investigate the flow structure and large-scale unsteadiness of a 3D shock wave/turbulent boundary layer interaction generated by a swept compression ramp in a Mach 2 flow. The unsteady dynamics of the flow are investigated using 50 kHz particle image velocimetry (PIV) in side-view and plan-view planes. The 50 kHz PIV velocity data are bandpass-filtered to investigate potential mechanisms that drive the large-scale unsteadiness. Our analysis shows that strong correlation exists between velocity fluctuations in the upstream boundary layer and motion of the separation-line surrogate for frequencies lower than 10 kHz (0.25 U∞/δ99). This frequency band correlates well with the characteristic frequency range of boundary layer superstructures. Separated flow motions in the high-frequency band (10–50 kHz) do not seem to be strongly correlated to the upstream flow, instead significant correlation is observed with structures within the separation region that move primarily in the cross-stream direction.