Flow-Induced Pressure Oscillations in Shallow Cavities

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.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1970
Accession Number
AD0880496

Entities

People

  • Eugene E. Covert
  • Graham D. Holmes
  • Hanno H. Heller

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aircrafts
  • Boundary Layer
  • Computational Fluid Dynamics
  • Convection
  • Energy Transfer
  • Flow Visualization
  • Fluid Dynamics
  • Frequency Bands
  • Mach Number
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Resonant Frequency
  • Test Facilities
  • Turbulent Mixing
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture