Interactions of Spanwise and Chordwise Vorticity Associated with Three-Dimensional Dynamic Stall Over an Oscillating Wing.

Abstract

This is the final report on the experimental research performed under U.S. Army Research Office Grant No. DAAL 03-91-0026, with Dr. Thomas Doligaiski as the Technical Program Manager. The Principal Investigator was B.R. Ramaprian. The research work involved the measurement of the pressure and velocity fields in the three-dimensional flow field surrounding and in the wake of the tip region of a rectangular wing of NACA 0015 profile. Measurements were made both with the wing stationary and with the wing oscillating sinusoidally in pitch about its quarter-chord axis. Pressure transducers and three-component laser Doppler velocimetry were used in these measurements. The results have been used to understand the vorticity dynamics in three-dimensional steady and unsteady flows. The study is relevant to helicopter rotor aerodynamics. All the data have been archived and are available for use by any interested reader.

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Document Details

Document Type
Technical Report
Publication Date
Oct 15, 1994
Accession Number
ADA290546

Entities

People

  • B. R. Ramaprian

Organizations

  • Washington State University

Tags

DTIC Thesaurus Topics

  • Boundary Layer
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Helicopter Rotors
  • Materials Engineering
  • Measurement
  • Pressure Distribution
  • Pressure Gradients
  • Pressure Measurement
  • Pressure Transducers
  • Reynolds Number
  • Shear Stresses
  • Three Dimensional
  • Three Dimensional Flow
  • Turbulent Mixing
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Academic Conference Management
  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy