Email RIS file
Bookmark
Report an Issue

Mitigation of wind tunnel wall interactions in subsonic cavity flows [electronic resource].

Published:
Washington, D.C. : United States. National Nuclear Security Administration, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
24 pages : digital, PDF file
Additional Creators:
Sandia National Laboratories, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access:
Free-to-read Unrestricted online access
Summary:
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.
Report Numbers:
E 1.99:sand--2014-19235j
sand--2014-19235j
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
03/06/2015.
"sand--2014-19235j"
"540806"
Experiments in Fluids 56 3 ISSN 0723-4864 AM
Justin L. Wagner; Katya Marie Casper; Steven J. Beresh; John F. Henfling; Russell Wayne Spillers; Brian Owen Matthew Pruett.
Funding Information:
AC04-94AL85000
View MARC record | catkey: 23504276