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Title: Fluid-structure interactions in compressible cavity flows

Abstract

Experiments were performed to understand the complex fluid-structure interactions that occur during aircraft internal store carriage. A cylindrical store was installed in a rectangular cavity having a length-to-depth ratio of 3.33 and a length-to-width ratio of 1. The Mach number ranged from 0.6 to 2.5 and the incoming boundary layer was turbulent. Fast-response pressure measurements provided aeroacoustic loading in the cavity, while triaxial accelerometers provided simultaneous store response. Despite occupying only 6% of the cavity volume, the store significantly altered the cavity acoustics. The store responded to the cavity flow at its natural structural frequencies, and it exhibited a directionally dependent response to cavity resonance. Specifically, cavity tones excited the store in the streamwise and wall-normal directions consistently, whereas a spanwise response was observed only occasionally. Also, the streamwise and wall-normal responses were attributed to the longitudinal pressure waves and shear layer vortices known to occur during cavity resonance. Although the spanwise response to cavity tones was limited, broadband pressure fluctuations resulted in significant spanwise accelerations at store natural frequencies. As a result, the largest vibrations occurred when a cavity tone matched a structural natural frequency, although energy was transferred more efficiently to natural frequencies having predominantly streamwise and wall-normalmore » motions.« less

Authors:
 [1];  [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:
1184573
Report Number(s):
SAND-2014-19234J
Journal ID: ISSN 1070-6631; 540805
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Fluids (1994)
Additional Journal Information:
Journal Volume: 27; Journal Issue: 6; Journal ID: ISSN 1070-6631
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; bubble dynamics; coherence; mach numbers; acceleration measurement; cavitation

Citation Formats

Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Hunter, Patrick S., Spillers, Russell Wayne, Henfling, John F., and Mayes, Randall L. Fluid-structure interactions in compressible cavity flows. United States: N. p., 2015. Web. doi:10.1063/1.4922021.
Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Hunter, Patrick S., Spillers, Russell Wayne, Henfling, John F., & Mayes, Randall L. Fluid-structure interactions in compressible cavity flows. United States. doi:10.1063/1.4922021.
Wagner, Justin L., Casper, Katya Marie, Beresh, Steven J., Hunter, Patrick S., Spillers, Russell Wayne, Henfling, John F., and Mayes, Randall L. Mon . "Fluid-structure interactions in compressible cavity flows". United States. doi:10.1063/1.4922021. https://www.osti.gov/servlets/purl/1184573.
@article{osti_1184573,
title = {Fluid-structure interactions in compressible cavity flows},
author = {Wagner, Justin L. and Casper, Katya Marie and Beresh, Steven J. and Hunter, Patrick S. and Spillers, Russell Wayne and Henfling, John F. and Mayes, Randall L.},
abstractNote = {Experiments were performed to understand the complex fluid-structure interactions that occur during aircraft internal store carriage. A cylindrical store was installed in a rectangular cavity having a length-to-depth ratio of 3.33 and a length-to-width ratio of 1. The Mach number ranged from 0.6 to 2.5 and the incoming boundary layer was turbulent. Fast-response pressure measurements provided aeroacoustic loading in the cavity, while triaxial accelerometers provided simultaneous store response. Despite occupying only 6% of the cavity volume, the store significantly altered the cavity acoustics. The store responded to the cavity flow at its natural structural frequencies, and it exhibited a directionally dependent response to cavity resonance. Specifically, cavity tones excited the store in the streamwise and wall-normal directions consistently, whereas a spanwise response was observed only occasionally. Also, the streamwise and wall-normal responses were attributed to the longitudinal pressure waves and shear layer vortices known to occur during cavity resonance. Although the spanwise response to cavity tones was limited, broadband pressure fluctuations resulted in significant spanwise accelerations at store natural frequencies. As a result, the largest vibrations occurred when a cavity tone matched a structural natural frequency, although energy was transferred more efficiently to natural frequencies having predominantly streamwise and wall-normal motions.},
doi = {10.1063/1.4922021},
journal = {Physics of Fluids (1994)},
issn = {1070-6631},
number = 6,
volume = 27,
place = {United States},
year = {2015},
month = {6}
}

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