Measurements of Velocity Components in the Wake of a Full-Scale Helicopter Rotor in Hover

Abstract

The report presents three-component wake velocity measurements made with a split-film total vector anemometer. The measurements were made in the wake of a full-scale OH-13E helicopter rotor which was mounted on a 60-foot rotor test tower at Mississippi State University. Time-averaged velocity distributions along wake radii at various distances below the rotor disk were measured for two conditions of disk loading and three combinations of blade pitch and rotor speed. Instantaneous velocity measurements were made across the helical vortex trails to investigate the effects of blade pitch and rotor speed on vortex structure, core size, transport velocity, and distribution of axial and tangential velocity components within the vortices.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0754644

Entities

People

  • Donald W. Boatwright

Organizations

  • Mississippi State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acquisition
  • Aircrafts
  • Anemometers
  • Axial Flow
  • Blade Tips
  • Computer Programming
  • Computers
  • Coordinate Systems
  • Data Acquisition
  • Data Reduction
  • Fixed Wing Aircraft
  • Flow Visualization
  • Helicopter Rotors
  • Load Cells
  • Measurement
  • Radial Velocity
  • Test Facilities

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.