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A Theoretical And Experimental Investigation Of The Acoustic Response Of Cavities In An Aerodynamic Flow

Report Number: WADD TR 61-75
Author: Plumblee, H. E.
Author: Lassiter, L. W.
Author: Gibson, J. S.
Corporate Author: Flight Dynamics Laboratory
Laboratory: Flight Dynamics Laboratory
Date of Publication: 1962-03
Pages: 164
Contract: AF 33(616)-6966
Project: 1370
Task: 137005
AD Number: AD0277803

Theory is developed for the resonant frequencies and pressure amplifications of a rectangular cavity of arbitrary dimensions in a flow field. An intermediate step involves the derivation of radiation impedance for a cavity at all Mach numbers, using the concepts of retarded potential theory. Experimental results are given for small cavities tested in the subsonic regime and for cavities up to 8" in length at supersonic Mach numbers from 1.75 to 5.0. Comparisons are drawn between theoretical and experimental frequency and amplitude response, indicating that the theory developed gives very good definition of the problem.

Lockheed Martin Missiles & Fire Control
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