Proceedings of the 2014 International Conference on Mechanics and Civil Engineering

Suppression of Pressure Oscillations for Supersonic Cavity Flow with Passive Control

Authors
Chao ZHANG, De-Jun SUN, Zhen-Hua WAN
Corresponding Author
Chao ZHANG
Available Online December 2014.
DOI
10.2991/icmce-14.2014.37How to use a DOI?
Keywords
Large Eddy Simulation (LES), Dynamic Mode Decomposition (DMD), Supersonic Cavity Flow, Pressure Oscillation
Abstract

Large eddy simulation (LES) for a supersonic Mach 1.8 flow past 2D cavities with/without passive control is carried out to investigate the characteristics of oscillations, and the dynamic mode decomposition (DMD) is used to identify the dominant flow structures with pertinent frequencies. A passive control by substituting the cavity trailing edge with a quarter-circle is studied. The pressure field for the dominant dynamic mode becomes more uniform, the intensity of fluctuations in the shear-layer is reduced, and the wavelength of the shear-layer vortices is significantly shortened under control. It is found that the dominant oscillation frequency of the cavity corresponds to the third Rossiter mode, which is significantly increased after control. The amplitude of the pressure oscillations in the cavity shifts to lower level. The sound pressure level (SPL) can even be reduced by approximate 10dB. The oscillation mechanism illustrated by the DMD remains the same after passive control. Overall, the oscillations of the cavity flow are closely linked with the shear-layer instability, which is suppressed by the current control technique.

Copyright
© 2014, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the 2014 International Conference on Mechanics and Civil Engineering
Series
Advances in Engineering Research
Publication Date
December 2014
ISBN
10.2991/icmce-14.2014.37
ISSN
2352-5401
DOI
10.2991/icmce-14.2014.37How to use a DOI?
Copyright
© 2014, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - CONF
AU  - Chao ZHANG
AU  - De-Jun SUN
AU  - Zhen-Hua WAN
PY  - 2014/12
DA  - 2014/12
TI  - Suppression of Pressure Oscillations for Supersonic Cavity Flow with Passive Control
BT  - Proceedings of the 2014 International Conference on Mechanics and Civil Engineering
PB  - Atlantis Press
SP  - 205
EP  - 210
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmce-14.2014.37
DO  - 10.2991/icmce-14.2014.37
ID  - ZHANG2014/12
ER  -