An Analytical and Experimental Study of Farfield Rotor Wake Geometry and Velocity

Abstract

All fixed wing aircraft generate trailing vortex wakes whose circulatory strength is dependent on flight conditions and aircraft geometry. A rotor also generates a vortex wake. A vortex sheet is shed from each blade. Each sheet rolls up rapidly outboard to form a tip vortex. The purpose of the study reported here is to estimate the rotor wake geometry and velocity field downstream of the rotor for the particular case where the rotor wake exhibits strong similarities to the fixed wing wake. A method is developed by which the helicopter far field wake can be readily compared to the far field wake generated by an equivalent wing.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0768797

Entities

People

  • Thomas A. Egolf

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Airplanes
  • Aspect Ratio
  • Computers
  • Electronic Equipment
  • Engineering
  • Far Field
  • Fixed Wing Aircraft
  • Flow
  • Geometry
  • Helicopters
  • Hot Wire Anemometers
  • Measurement
  • Stratified Fluids
  • Trailing Vortices
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Mechanics and Fluid Dynamics.