Inflow Measurements made with a Laser Velocimeter on a Helicopter Model in Forward Flight. Volume 6. Rectangular Planform Blades at an Advance Ratio of 0.35

Abstract

An experimental investigation was conducted in the 14- by 22-Foot subsonic Tunnel at the NASA Langley Research Center to measure the inflow into a scale model helicopter rotor in forward flight (micro = 0.35). The measurements were made with a two-component Laser Velocimeter (LV) one chord above the plane formed by the path of the rotor tips (tip-path-plane). A conditional sampling technique was used to determine the position of the rotor at the time that each velocity measurement was made so that the azimuthal fluctuations in velocity could be determined. Measurements were made at a total of 179 separate locations in order to clearly define the inflow character. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1989
Accession Number
ADA242827

Entities

People

  • Danny R. Hoad
  • Joe W. Elliott
  • Richard H. Sailey
  • Susan L. Althoff

Organizations

  • Langley Research Center

Tags

DTIC Thesaurus Topics

  • Acquisition
  • Army Aviation
  • Coefficients
  • Computational Fluid Dynamics
  • Control Systems
  • Data Acquisition
  • Flow Fields
  • Fourier Series
  • Helicopter Rotors
  • Helicopters
  • Laser Velocimeters
  • Measurement
  • Particles
  • Processing Equipment
  • Scale Models
  • Standards
  • Velocimeters

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.

Technology Areas

  • Directed Energy