Full Text:   <1239>

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CLC number: V231.3

On-line Access: 2020-06-10

Received: 2019-02-05

Revision Accepted: 2020-07-15

Crosschecked: 2020-08-06

Cited: 0

Clicked: 1863

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Wen-xin Hou

https://orcid.org/0000-0002-1322-4359

Jun-tao Chang

https://orcid.org/0000-0003-0019-2068

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Journal of Zhejiang University SCIENCE A 2020 Vol.21 No.8 P.614-635

http://doi.org/10.1631/jzus.A2000042


Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves


Author(s):  Wen-xin Hou, Jun-tao Chang, Chen Kong, Wen Bao, Laurent Dala

Affiliation(s):  School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; more

Corresponding email(s):   changjuntao@hit.edu.cn

Key Words:  Self-excited oscillation, Background waves, Asymmetrical structure, Source of perturbation


Wen-xin Hou, Jun-tao Chang, Chen Kong, Wen Bao, Laurent Dala. Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves[J]. Journal of Zhejiang University Science A, 2020, 21(8): 614-635.

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author="Wen-xin Hou, Jun-tao Chang, Chen Kong, Wen Bao, Laurent Dala",
journal="Journal of Zhejiang University Science A",
volume="21",
number="8",
pages="614-635",
year="2020",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000042"
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%T Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves
%A Wen-xin Hou
%A Jun-tao Chang
%A Chen Kong
%A Wen Bao
%A Laurent Dala
%J Journal of Zhejiang University SCIENCE A
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%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000042

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T1 - Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves
A1 - Wen-xin Hou
A1 - Jun-tao Chang
A1 - Chen Kong
A1 - Wen Bao
A1 - Laurent Dala
J0 - Journal of Zhejiang University Science A
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EP - 635
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2000042


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.

带有背景波系的隔离段内激波串自激振荡的实验研究与分析

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.

关键词:自激振荡; 背景波系; 非对称结构; 扰动源

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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