ON VORTEX STREET WAKES

Abstract

The flow in the wake of a two-dimensional blunt-trailing-edge model was investigated in the Reynolds number range 1.3 x 10 to the 4th to 4.1 x 10 to the 4th. The effects of splitter plates and base bleed on the vortex street were examined. Measurements were made of the longitudinal spacing between vortices and the velocity of the vortices, and compared with values predicted by von Karman's potential vortex street model. The lateral spacing was estimated by using both the von Karman and Kronauer stability criteria. A new universal wake Strouhal number is devised, using the value of lateral spacing predicted by the Kronauer stability condition as the length dimension. A correlation of bluff body data was found when pressure drag coefficient times Strouhal number was plotted against base pressure.

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Document Details

Document Type
Technical Report
Publication Date
Apr 18, 1966
Accession Number
AD0642149

Entities

People

  • P. W. Bearman

Organizations

  • National Physical Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Base Pressure
  • Boundary Layer
  • Drag
  • Flow
  • Fluid Flow
  • Free Stream
  • Frequency
  • Hot Wire
  • Measurement
  • Potential Flow
  • Pressure Distribution
  • Reynolds Number
  • Stability Conditions
  • Strouhal Number
  • Trailing Edges
  • Turbulent Mixing
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster
  • Space - Orbital Debris