研究方形突起上流动中三维冲击-边界层相互作用引起的不稳定性

IF 1.7 4区 工程技术 Q3 MECHANICS
K. Ramachandra, S. Bhardwaj, J. N. Murugan, R. Sriram
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引用次数: 0

摘要

摘要 通过风洞实验研究了冲击引起的流经三维方形突起的非稳定分离流的动力学。采用的诊断方法是时间分辨离层成像和非稳态表面压力测量。通过对裂隙快照进行动态模态分解(DMD)以及对压力数据中的频谱和相关性进行分析,对流动物理特性进行了描述和解析。发现中心线上的平均冲击脚显示出约 0.01 的斯特劳哈尔数,这也是文献中报道的二维冲击-边界层相互作用的斯特劳哈尔数的数量级。一般来说,壁压频谱随着远离中心线(跨度方向)而向低频移动,峰值的性质也有一些变化。交叉相关分析表明,平均冲击振荡与高原压力区域有很强的相关性,扰动从分离气泡内部向上游传播。在斯特劳哈尔数约为 0.015 之前,跨度平均冲击脚位置之间具有良好的一致性,这表明三维冲击脚在很大程度上以一致的方式来回移动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Study of unsteadiness due to 3-D shock–boundary layer interaction in flow over a square-faced protuberance

Study of unsteadiness due to 3-D shock–boundary layer interaction in flow over a square-faced protuberance

The dynamics of shock-induced unsteady separated flow past a three-dimensional square-faced protuberance are investigated through wind tunnel experiments. Time-resolved schlieren imaging and unsteady surface pressure measurements are the diagnostics employed. Dynamic mode decomposition (DMD) of schlieren snapshots and analysis of spectrum and correlations in pressure data are used to characterize and resolve the flow physics. The mean shock foot in the centreline is found to exhibit a Strouhal number of around 0.01, which is also the order of magnitude of the Strouhal numbers reported in the literature for two-dimensional shock–boundary layer interactions. The wall pressure spectra, in general, shift towards lower frequencies as one moves away (spanwise) from the centreline with some variation in the nature of peaks. The cross-correlation analysis depicts the strong dependence of the mean shock oscillations and the plateau pressure region, and disturbances are found to travel upstream from inside the separation bubble. Good coherence is observed between the spanwise mean shock foot locations till a Strouhal number of about 0.015 indicating that the three-dimensional shock foot largely moves to-and-fro in a coherent fashion.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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