Spatial distribution of pressure resonance in compressible cavity flow

Casper, Katya Marie; Wagner, Justin L.; Beresh, Steven J.; Spillers, Russell Wayne; Henfling, John F.; Dechant, Lawrence J.

doi:10.1017/jfm.2018.346

Title: Spatial distribution of pressure resonance in compressible cavity flow

Journal Article · 10 August 2018 · Journal of Fluid Mechanics

DOI: https://doi.org/10.1017/jfm.2018.346 · OSTI ID:1459986

^[1];

^[1]; Beresh, Steven J. ^[1]; Spillers, Russell Wayne ^[1]; Henfling, John F. ^[1]; Dechant, Lawrence J. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The development of the unsteady pressure field on the floor of a rectangular cavity was studied at Mach 0.9 using high-frequency pressure-sensitive paint. Power spectral amplitudes at each cavity resonance exhibit a spatial distribution with a streamwise-oscillatory 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 downstream-propagating shear-layer disturbance and an upstream-propagating acoustic wave of different amplitudes and convection velocities, consistent with the classical Rossiter model. The summation of these waves generates a net downstream-traveling wave whose amplitude and phase velocity are modulated by a fixed envelope within the cavity. This traveling-wave 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 finite-width cavity.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1459986

Report Number(s):: SAND2018-4314J; applab; 662694

Journal Information:: Journal of Fluid Mechanics, Vol. 848; ISSN 0022-1120

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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