An Experimental and Computational Investigation of a 3D, l/h=5 Transonic Cavity Flow

Abstract

This paper presents an investigation of a transonic flow (M = 0.85) over a rectangular cavity having a length-to-depth ratio of 5. Velocities were measured inside the cavity on the central plane and two off-centre planes using a two-component particle image velocimetry system. These measurements were supported by surface flow visualisation, and mean and time-varying surface pressure measurements. The flow was also simulated using an unsteady Reynolds-averaged Navier Stokes code, with a realizable k-epsilon turbulence model. It is shown that this CFD model does not capture all the characteristics of the flowfield correctly. However, by using this integrated experimental and computational approach we have been able to identify the presence of new vortical structures within the cavity and point out the importance of free shear layer flexibility in the cavity oscillation process.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2007
Accession Number
ADA515541

Entities

People

  • Kenda Knowles
  • N. J. Lawson
  • S. A. Ritchie

Organizations

  • Cranfield University

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Boundary Layer
  • Cameras
  • Computational Fluid Dynamics
  • Data Acquisition
  • Experimental Data
  • Flow Fields
  • Flow Visualization
  • Geometry
  • Pressure Distribution
  • Pressure Measurement
  • Simulations
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional
  • United States Air Force Academy

Fields of Study

  • Physics

Readers

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