Mitigation of wind tunnel wall interactions in subsonic cavity flows

Wagner, Justin L.; Casper, Katya Marie; Beresh, Steven J.; Henfling, John F.; Spillers, Russell Wayne; Pruett, Brian Owen Matthew

doi:10.1007/s00348-015-1924-8

Mitigation of wind tunnel wall interactions in subsonic cavity flows

Journal Article · Thu Mar 05 23:00:00 EST 2015 · Experiments in Fluids

DOI:https://doi.org/10.1007/s00348-015-1924-8· OSTI ID:1184574

Wagner, Justin L. ^[1]; Casper, Katya Marie ^[1]; Beresh, Steven J. ^[1]; Henfling, John F. ^[1]; Spillers, Russell Wayne ^[1]; Pruett, Brian Owen Matthew ^[1]

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

In this study, the flow over an open aircraft bay is often represented in a wind tunnel with a cavity. In flight, this flow is unconfined, though in experiments, the cavity is surrounded by wind tunnel walls. If untreated, wind tunnel wall effects can lead to significant distortions of cavity acoustics in subsonic flows. To understand and mitigate these cavity–tunnel interactions, a parametric approach was taken for flow over an L/D = 7 cavity at Mach numbers 0.6–0.8. With solid tunnel walls, a dominant cavity tone was observed, likely due to an interaction with a tunnel duct mode. Furthermore, an acoustic liner opposite the cavity decreased the amplitude of the dominant mode and its harmonics, a result observed by previous researchers. Acoustic dampeners were also placed in the tunnel sidewalls, which further decreased the dominant mode amplitudes and peak amplitudes associated with nonlinear interactions between cavity modes. This then indicates that cavity resonance can be altered by tunnel sidewalls and that spanwise coupling should be addressed when conducting subsonic cavity experiments. Though mechanisms for dominant modes and nonlinear interactions likely exist in unconfined cavity flows, these effects can be amplified by the wind tunnel walls.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1184574

Report Number(s):: SAND--2014-19235J; 540806

Journal Information:: Experiments in Fluids, Journal Name: Experiments in Fluids Journal Issue: 3 Vol. 56; ISSN 0723-4864

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Self-calibration performance in stereoscopic PIV acquired in a transonic wind tunnel Beresh, Steven J.; Wagner, Justin L.; Smith, Barton L. Experiments in Fluids, Vol. 57, Issue 4 https://doi.org/10.1007/s00348-016-2131-y	journal	March 2016
Resonance dynamics in compressible cavity flows using time-resolved velocity and surface pressure fields Wagner, Justin L.; Beresh, Steven J.; Casper, Katya M. Journal of Fluid Mechanics, Vol. 830 https://doi.org/10.1017/jfm.2017.606	journal	October 2017
Pulse-burst PIV in a high-speed wind tunnel Beresh, Steven; Kearney, Sean; Wagner, Justin Measurement Science and Technology, Vol. 26, Issue 9 https://doi.org/10.1088/0957-0233/26/9/095305	journal	July 2015
Response of a Store with Tunable Natural Frequencies in Compressible Cavity Flow Wagner, Justin L.; Casper, Katya M.; Beresh, Steven J. AIAA Journal, Vol. 54, Issue 8 https://doi.org/10.2514/1.j054688	journal	August 2016
Spatial Distribution of Resonance in the Velocity Field for Transonic Flow over a Rectangular Cavity Beresh, Steven J.; Wagner, Justin L.; Casper, Katya M. AIAA Journal, Vol. 55, Issue 12 https://doi.org/10.2514/1.j056106	journal	December 2017
Volumetric Velocimetry of Complex Geometry Effects on Transonic Flow over Cavities DeMauro, Edward P.; Beresh, Steven J.; Casper, Katya M. AIAA Journal, Vol. 57, Issue 5 https://doi.org/10.2514/1.j057714	journal	May 2019
Pulse-Burst PIV in a High-Speed Wind Tunnel Beresh, Steven J.; Kearney, Sean P.; Wagner, Justin L. 53rd AIAA Aerospace Sciences Meeting https://doi.org/10.2514/6.2015-1218	conference	January 2015
Response of a Store with Tunable Natural Frequencies in Compressible Cavity Flow Wagner, Justin L.; Casper, Katya M.; Beresh, Steven J. 53rd AIAA Aerospace Sciences Meeting https://doi.org/10.2514/6.2015-1293	conference	January 2015

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