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Cavity Pressure Oscillations: The Generating Mechanism Visualized

Heller, H. and Delfs, J. (1996) Cavity Pressure Oscillations: The Generating Mechanism Visualized. Letter to the Editor im Journal of Sound and Vibration (1996) 196(2), pp. 248-252.

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Abstract

Renewed interest in understanding and solving the problem of intense pressure oscillations in shallow rectangular cavities subject to an external transonic flow has led to a number of recent publications proposing physical generating mechanisms and theoretical models to predict oscillation frequencies (1,2) and mostly empirical models to predict levels (3,4). A good up-to-date survey has appeared in reference (5). For a typical such cavity of, say, L &#61 4m length, D &#61 0.75m depth and W &#61 0.6m width, under M &#61 1.2 flow, pressure levels near the cavity trailing edge are to be expected which would by far exceed values of 160dB (re2x10**N/m*) at frequencies low as f*&#6130Hz, f*&#6170Hz and f*&#61110Hz, approximately, for the first three modes. If such a cavity were imbedded in an aircraft's exterior surface, the high oscillation intensities at these low frequencies could lead to structural fatigue of airplane components and could adversely affect nearby electronic equipment.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1996,
Title:Cavity Pressure Oscillations: The Generating Mechanism Visualized
Authors:
AuthorsInstitution or Email of Authors
Heller, H.UNSPECIFIED
Delfs, J.UNSPECIFIED
Date:1996
Journal or Publication Title:Letter to the Editor im Journal of Sound and Vibration (1996) 196(2)
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 248-252
Series Name:196(2)
Status:Published
Keywords:cavity flow, shallow cavities, pressure oscillations, shear layer oscillation, self-sustained flow oscillation, sound generation....
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - Human Factors and Safety in Aeronautics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:06

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