Experimental Investigation of the Mechanisms Underlying Vortex Kinematics in Unsteady Separated Flows

Abstract

Unsteady separated flow fields in the vicinity of a flat plate oscillating sinusoidally in pitch about the quarterchord were investigated for a broad range of pitching parameters. Phase locked photography of smoke flow visualization was employed in conjunction with hotwire anemometry to quantify vortex development as well as some of the primary boundary layer interactions contributing to the observed vortex kinematics. Leading edge vortex development was strongly influenced by both the freestream and boundary layer flows. These and other observations facilitated formulation of an conceptual model which accounts for many of these observations. Quantitative refinement of such a model is one methodology through which unsteady separation may eventually be understood, predicted and controlled for employment in future air vehicles. (emk) Keywords: Vortices; Vortex kinematics; Unsteady separated flows; Aerodynamics.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA217889

Entities

People

  • Scott J. Schreck

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aeroelasticity
  • Air Force
  • Aircrafts
  • Airframes
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Convection
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Helicopter Rotors
  • Measurement
  • Mechanical Properties
  • Pressure Distribution

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.
  • Systems Analysis and Design