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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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 = 4m length, D = 0.75m depth and W = 0.6m width, under M = 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*៲Hz, f*᠚Hz and f*Hz, 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.
|Title:||Cavity Pressure Oscillations: The Generating Mechanism Visualized|
|Journal or Publication Title:||Letter to the Editor im Journal of Sound and Vibration (1996) 196(2)|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 248-252|
|Keywords:||cavity flow, shallow cavities, pressure oscillations, shear layer oscillation, self-sustained flow oscillation, sound generation....|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||no assignment|
|HGF - Program Themes:||no assignment|
|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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