Interactions of a Quasi-Two-Dimensional Vortex with a Stationary and Oscillating Leading-Edge

Abstract

Interactions of a quasi-two-dimensional vortex with a stationary and oscillating leading-edge were examined using a scanning laser version of high-image-density particle image velocimetry (PIV). The incident vortex street was generated by sinusoidal oscillation of an airfoil located upstream of the leading-edge. The reduced frequency of vortex convection and the oscillation of the leading-edge were equal, allowing the phase shift between them to be varied independently. At the lower of two Reynolds numbers, a well resolved time sequence of the interactions was obtained. PIV images provide the first quantitative description of the edge interaction, employing instantaneous vorticity distributions and streamline patterns to reveal new topological features. These include the approach, deformation and splitting of an incident clockwise vortex, and the generation of tip and surface vortices on the lower surface of the stationary leading-edge.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1996
Accession Number
ADA311871

Entities

People

  • Rhett W. Jefferies

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Airframes
  • Boundary Layer
  • Computational Fluid Dynamics
  • Convection
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Helicopter Rotors
  • Leading Edges
  • Stratified Fluids
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional
  • Wind Turbines

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy