Control of shock wave/boundary layer interactions in a supersonic air intake using a modified backward-facing step

IF 1.7 4区工程技术 Q3 MECHANICS

Shock Waves Pub Date : 2022-08-17 DOI:10.1007/s00193-022-01091-5

N. Khobragade, R. Kumar

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Abstract

The safe operation and performance of a mixed compression air intake critically depend on the nature of shock wave/boundary layer interactions (SBLIs). The interaction between the ramp boundary layer and the cowl shock at the ramp–isolator junction plays a key role. In this experimental study, a modified backward-facing step called “notch” is used at the ramp–isolator junction to control the SBLI in a rectangular intake at Mach 3. The unstart and performance characteristics are evaluated and compared with the baseline, “faceted” configuration. The intake was unstarted by varying the back-pressure using a choke flap located at the exit in a quasi-steady manner. The surface and rake pressure measurements in addition to the shadowgraph and oil flow visualizations were taken to characterize the effect of flow control. The results showed that the notch anchors the separation bubble at the ramp–isolator junction and helps mitigate the strength of SBLI. The notched intake static pressures are relatively lower as compared to the baseline configuration suggesting reduced severity of structural loads. The floor boundary layer is energized by the notch leading to better efficiency and flow uniformity. There is an increase in the margin of unstart due to the presence of the notch by 7–10%.

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利用改进后向阶跃控制超音速进气道激波/边界层相互作用

混合压缩进气口的安全运行和性能在很大程度上取决于激波/边界层相互作用(SBLIs)的性质。斜坡边界层与斜坡-隔离器交界处的冷冲击之间的相互作用起着关键作用。在本实验研究中，在坡道-隔离器连接处使用了一种改进的后面向台阶“缺口”来控制3马赫时矩形进气道中的SBLI。对未启动和性能特征进行评估，并与基线的“分面”配置进行比较。进气是通过使用位于出口的节流瓣以准稳定的方式改变背压来启动的。除了阴影图和油流可视化之外，还采用了表面和前压测量来表征流动控制的效果。结果表明，缺口将分离泡锚定在斜坡-隔离器交界处，有助于减轻SBLI的强度。与基线配置相比，缺口进气静压力相对较低，表明结构负载的严重性降低。底板附面层受缺口激励，效率更高，流动均匀性更好。由于缺口的存在，不启动的余量增加了7-10%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Shock Waves 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

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.