Experimental investigation of the transonic shock-wave/boundary-layer interaction over a shock-generation bump
Experimental investigation of the transonic shock-wave/boundary-layer interaction over a shock-generation bump
复制标题
跨音速激波/边界层在激波产生凸起上相互作用的实验研究
DOI：
10.1063/5.0018763
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发表时间：
2020-10
影响因子：
4.6
通讯作者：
Zhengzhong Sun;X. Miao;Chetan Jagadeesh
中科院分区：
文献类型：
--
作者：
Zhengzhong Sun;X. Miao;Chetan Jagadeesh
利用粒子图像测速技术和高速纹影技术对激波发生器凸台上的跨音速激波/边界层干扰进行了实验研究。详细研究了T-SWBLI流场。近壁相互作用区域通过纹影以高空间分辨率可视化，并通过条件统计分析进一步研究。与激波运动有关的不稳定性是特别令人感兴趣的。提取的冲击波的位置，使频谱分析的冲击波振荡。最后给出了纹影像系综的傅里叶模态分析。傅立叶模态证实了激波区和相互作用区的低频非定常性。此外，在相互作用区域的后部的流动波动被发现延伸到中频区。此外，本实验研究表明，纹影是一个强大的工具，在解决近壁结构，利用短曝光时间和收敛的统计。
A transonic shock-wave/boundary-layer interaction (T-SWBLI) established on a shock-generation bump has been investigated experimentally through particle image velocimetry and high-speed schlieren. The T-SWBLI flowfields have been examined in detail. The near-wall interaction region is visualized with high spatial resolution through schlieren and is further investigated through conditional statistical analysis. The unsteadiness associated with the shock-wave motion is of special interest. The shock-wave locations are extracted to allow spectral analysis of the shock-wave oscillations. The Fourier modal analysis on the schlieren image ensemble is finally reported. The Fourier modes confirm the low-frequency unsteadiness in the shock-wave region and the interaction region. Moreover, the flow fluctuation in the rear part of the interaction region is found to extend into the medium-frequency regime. In addition, the present experimental study showcases that schlieren is a powerful tool in resolving near-wall structures by making use of short exposure time and converged statistics.