Flow-Induced Pressure Oscillations in Shallow Cavities
- 1 December 1970
- report
- Published by Defense Technical Information Center (DTIC)
Abstract
The report presents the results of an experimental wind-tunnel study of flow-induced pressure oscillations in shallow cavities (length-to-depth ratio from 4 to 7). A variable-depth rectangular cavity was exposed to tangential flow over the open surface in the Mach-number range from 0.8 to 3, with flow stagnation pressures varying from 2 to 15 psia. The cavity was tested in an empty stage and with one or two stores. Third-octave band and narrowband fluctuating-pressure spectra were obtained at various locations within the cavity and under the approaching boundary layer; these spectra yielded information on broadband and resonant response characteristics. Information on the longitudinal and lateral energy distribution, on recirculating-flow velocities, and on temperatures within the cavity was also obtained. This information was used to develop a scheme for predicting resonant frequencies and associated pressure-mode shapes, as well as discrete-frequency and broadband pressure amplitudes.Keywords
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