Spatial distribution of pressure resonance in compressible cavity flow
The development of the unsteady pressure field on the floor of a rectangular cavity was studied at Mach 0.9 using highfrequency pressuresensitive paint. Power spectral amplitudes at each cavity resonance exhibit a spatial distribution with a streamwiseoscillatory pattern; additional maxima and minima appear as the mode number is increased. This spatial distribution also appears in the propagation velocity of modal pressure disturbances. This behavior was tied to the superposition of a downstreampropagating shearlayer disturbance and an upstreampropagating acoustic wave of different amplitudes and convection velocities, consistent with the classical Rossiter model. The summation of these waves generates a net downstreamtraveling wave whose amplitude and phase velocity are modulated by a fixed envelope within the cavity. This travelingwave interpretation of the Rossiter model correctly predicts the instantaneous modal pressure behavior in the cavity. Here, subtle spanwise variations in the modal pressure behavior were also observed, which could be attributed to a shift in the resonance pattern as a result of spillage effects at the edges of the finitewidth cavity.
 Authors:

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 Sandia National Lab. (SNLNM), Albuquerque, NM (United States)
 Publication Date:
 Report Number(s):
 SAND20184314J
Journal ID: ISSN 00221120; applab; 662694
 Grant/Contract Number:
 AC0494AL85000
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of Fluid Mechanics
 Additional Journal Information:
 Journal Volume: 848; Journal ID: ISSN 00221120
 Publisher:
 Cambridge University Press
 Research Org:
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States)
 Sponsoring Org:
 USDOE National Nuclear Security Administration (NNSA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
 OSTI Identifier:
 1459986
Casper, Katya Marie, Wagner, Justin L., Beresh, Steven J., Spillers, Russell Wayne, Henfling, John F., and Dechant, Lawrence J.. Spatial distribution of pressure resonance in compressible cavity flow. United States: N. p.,
Web. doi:10.1017/jfm.2018.346.
Casper, Katya Marie, Wagner, Justin L., Beresh, Steven J., Spillers, Russell Wayne, Henfling, John F., & Dechant, Lawrence J.. Spatial distribution of pressure resonance in compressible cavity flow. United States. doi:10.1017/jfm.2018.346.
Casper, Katya Marie, Wagner, Justin L., Beresh, Steven J., Spillers, Russell Wayne, Henfling, John F., and Dechant, Lawrence J.. 2018.
"Spatial distribution of pressure resonance in compressible cavity flow". United States.
doi:10.1017/jfm.2018.346.
@article{osti_1459986,
title = {Spatial distribution of pressure resonance in compressible cavity flow},
author = {Casper, Katya Marie and Wagner, Justin L. and Beresh, Steven J. and Spillers, Russell Wayne and Henfling, John F. and Dechant, Lawrence J.},
abstractNote = {The development of the unsteady pressure field on the floor of a rectangular cavity was studied at Mach 0.9 using highfrequency pressuresensitive paint. Power spectral amplitudes at each cavity resonance exhibit a spatial distribution with a streamwiseoscillatory pattern; additional maxima and minima appear as the mode number is increased. This spatial distribution also appears in the propagation velocity of modal pressure disturbances. This behavior was tied to the superposition of a downstreampropagating shearlayer disturbance and an upstreampropagating acoustic wave of different amplitudes and convection velocities, consistent with the classical Rossiter model. The summation of these waves generates a net downstreamtraveling wave whose amplitude and phase velocity are modulated by a fixed envelope within the cavity. This travelingwave interpretation of the Rossiter model correctly predicts the instantaneous modal pressure behavior in the cavity. Here, subtle spanwise variations in the modal pressure behavior were also observed, which could be attributed to a shift in the resonance pattern as a result of spillage effects at the edges of the finitewidth cavity.},
doi = {10.1017/jfm.2018.346},
journal = {Journal of Fluid Mechanics},
number = ,
volume = 848,
place = {United States},
year = {2018},
month = {8}
}