THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE INSTANTANEOUS INDUCED VELOCITY FIELD IN THE WAKE OF A LIFTING ROTOR

Abstract

Measurements have been made of the instantaneous and time-averaged values of the induced velocities in the wake of a full-scale helicopter in actual steady flight conditions. These measurements were made with three- dimensional pitot static and two-dimensional hot film probes. The test setup provided for measurements at several radial, axial, and azimuthal positions relative to the rotor centerline. Simple, analytical methods are formulated to predict the instantaneous and time-averaged, induced velocities in the rotor wake. Calculated values of the induced velocities are compared with the experimental data, and agreement is obtained for the hovering flight condition.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1968
Accession Number
AD0667384

Entities

People

  • A. A. Perlmutter
  • J. C. Tang
  • Nathan Miller

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Army Aviation
  • Axial Flow
  • Blade Tips
  • Center Of Gravity
  • Coordinate Systems
  • Digital Computers
  • Engineers
  • Fuels
  • Materials Laboratories
  • Measurement
  • Military Research
  • Pressure Transducers
  • Radial Velocity
  • Test And Evaluation
  • Three Dimensional
  • United States

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Dynamics.