Investigation of the Orthogonal Blade-Vortex Interaction

Abstract

A Stereoscopic Particle Image Velocimetry (SPIV) system was developed and applied to measurements of the Orthogonal Blade-Vortex Interaction (BVI) in a wind tunnel. Measurements of the isolated vortex showed that the SPIV system could resolve the jet velocity profile within the vortex core to a reasonable accuracy, and views of the vortex from different sides of the wind tunnel showed similar velocity profiles. For the BVI measurements the SPIV system showed the existence of a strong splash' back effect as the vortex impacted on the lower surface of the blade; the splash effect consists of deceleration and reversal of the vortex core jet velocity. Over the upper surface the SPIV system again showed a reduction of the vortex core jet velocity, but could only suggest the development of an in-flow towards the blade surface. As such the SPIV system has not provided a complete physical description of the fluid dynamics of the BVI over the blade upper surface, and any further investigation should probably use Laser Doppler Anemometry. Behind the blade the vortex rapidly becomes reorganized. (16 figures, 44 refs.)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2003
Accession Number
ADA420101

Entities

People

  • F. N. Coton
  • J. M. Early
  • R. B. Green

Organizations

  • University of Glasgow

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Aircrafts
  • Airframes
  • Axial Flow
  • Boundary Layer
  • Engineering
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Helicopter Rotors
  • Measurement
  • Particle Image Velocimetry
  • Tail Rotors
  • Three Dimensional
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Atmospheric Science/Meteorology
  • Fluid Dynamics.

Technology Areas

  • Directed Energy