CLC number: V231.3
On-line Access: 2024-08-27
Received: 2023-10-17
Revision Accepted: 2024-05-08
Crosschecked: 2020-08-06
Cited: 0
Clicked: 3334
Citations: Bibtex RefMan EndNote GB/T7714
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.
@article{title="Experimental study and analysis of shock train self-excited oscillation in an isolator with background waves",
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"
}
%0 Journal Article
%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
%V 21
%N 8
%P 614-635
%@ 1673-565X
%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000042
TY - JOUR
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
VL - 21
IS - 8
SP - 614
EP - 635
%@ 1673-565X
Y1 - 2020
PB - Zhejiang University Press & Springer
ER -
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.
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