Abstract
A study of shock train self-excited oscillation in an isolator with background waves was implemented through a wind tunnel experiment. Dynamic pressure data were captured by high-frequency pressure measurements and the flow field was recorded by the high-speed Schlieren technique. The shock train structure was mostly asymmetrical during self-excited oscillation, regardless of its oscillation mode. We found that the pressure discontinuity caused by background waves was responsible for the asymmetry. On the wall where the pressure at the leading edge of the shock train was lower, a large separation region formed and the shock train deflected toward to the other wall. The oscillation mode of the shock train was related to the change of wall pressure in the oscillation range of its leading edge. The oscillation range and oscillation intensity of the shock train leading edge were affected by the wall pressure gradient induced by background waves. When located in a negative pressure gradient region, the oscillation of the leading edge strengthened; when located in a positive pressure gradient region, the oscillation weakened. To find out the cause of self-excited oscillation, correlation and phase analyses were performed. The results indicated that the instability of the separation region induced by the leading shock was the source of perturbation that caused self-excited oscillation, regardless of the oscillation mode of the shock train.
概要
目的
隔离段内存在背景波系时, 激波串在自激振荡过 程中会出现三种振荡模式, 并表现出非对称结 构. 本文旨在研究背景波系是如何引起激波串的 非对称结构以及背景波系对振荡特性的影响, 并 探究自激振荡的扰动来源.
创新点
1. 从激波串结构和振荡特性两个方面揭示背景波 系对激波串自激振荡的影响; 2. 获得引起激波串 自激振荡的扰动来源.
方法
1. 通过实验分析, 结合激波极曲线, 研究背景波 系引起的压力间断对激波串结构的影响; 2. 结合 实验获得的激波串振荡特性以及数值模拟得到 的壁面压力梯度, 分析背景波系引起的压力梯度 对自激振荡的影响; 3. 通过对壁面压力进行相关 性分析和相位分析, 获得自激振荡扰动的来源.
结论
1. 背景波系引起的压力间断导致了激波串的非对 称结构; 2. 背景波系引起的壁面压力梯度影响激 波串前缘的振荡范围和振荡强度; 3. 在带有背景 波系的隔离段内, 引起自激振荡的扰动来源于前 缘激波产生的分离区内.
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Wen-xin HOU designed the research. Wen-xin HOU and Chen KONG processed the corresponding data. Wen-xin HOU wrote the first draft of the manuscript. Jun-tao CHANG, Wen BAO, and Laurent DALA helped to organize the manuscript. Wen-xin HOU revised and edited the final version.
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Project supported by the National Natural Science Foundation of China (Nos. 11972139 and 51676204)
Conflict of interest
Wen-xin HOU, Jun-tao CHANG, Chen KONG, Wen BAO, and Laurent DALA declare that they have no conflict of interest.
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Hou, Wx., Chang, Jt., Kong, C. et al. Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves. J. Zhejiang Univ. Sci. A 21, 614–635 (2020). https://doi.org/10.1631/jzus.A2000042
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DOI: https://doi.org/10.1631/jzus.A2000042