Studies of the Dynamic Stall or Airfoil Profiles for Helicopter Rotors.

Abstract

The interaction of oscillations of the mean velocity of the relative flow with the periodic changes in angle of attack that are produced in the forward flight of helicopters on the airfoil profiles of the rotors has been investigated for the first time. The study conducted in the IIT 2 ft x 2 ft oscillating flow wind tunnel coupled with visual observations in a small water tunnel has revealed that the aerodynamic characteristics of oscillating flows in steady flow, documented by a number of investigators, may be altered significantly when oscillations of the flow velocity are superimposed on those of the angle of attack of the airfoil. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 20, 1979
Accession Number
ADA065106

Entities

People

  • Andrew A. Fejer

Organizations

  • Illinois Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Boundary Layer
  • Boundary Layer Trips
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Free Stream
  • Helicopter Rotors
  • Measurement
  • Mechanical Properties
  • Pressure Distribution
  • Reynolds Number
  • Steady Flow
  • Turbulent Mixing
  • Unsteady Flow
  • Water Tunnels
  • Wind Tunnels

Fields of Study

  • Physics

Readers

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