skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Mitigation of wind tunnel wall interactions in subsonic cavity flows

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1184574
Report Number(s):
SAND-2014-19235J
Journal ID: ISSN 0723-4864; 540806
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Volume: 56; Journal Issue: 3; Journal ID: ISSN 0723-4864
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; cavity; modes; wind tunnel; acoustics; interaction

Citation Formats

Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, and Pruett, Brian Owen Matthew. Mitigation of wind tunnel wall interactions in subsonic cavity flows. United States: N. p., 2015. Web. doi:10.1007/s00348-015-1924-8.
Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, & Pruett, Brian Owen Matthew. Mitigation of wind tunnel wall interactions in subsonic cavity flows. United States. doi:10.1007/s00348-015-1924-8.
Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Henfling, John F., Spillers, Russell Wayne, and Pruett, Brian Owen Matthew. Fri . "Mitigation of wind tunnel wall interactions in subsonic cavity flows". United States. doi:10.1007/s00348-015-1924-8. https://www.osti.gov/servlets/purl/1184574.
@article{osti_1184574,
title = {Mitigation of wind tunnel wall interactions in subsonic cavity flows},
author = {Wagner, Justin L. and Casper, Katya Marie and Beresh, Steven J. and Henfling, John F. and Spillers, Russell Wayne and Pruett, Brian Owen Matthew},
abstractNote = {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.},
doi = {10.1007/s00348-015-1924-8},
journal = {Experiments in Fluids},
number = 3,
volume = 56,
place = {United States},
year = {Fri Mar 06 00:00:00 EST 2015},
month = {Fri Mar 06 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

Save / Share: