Investigation of the Dissipation of the Tip Vortex of a Rotor Blade by Mass Injection

Abstract

The report describes an experimental research program in which the outer section of a UH-1D helicopter blade was modified to incorporate a system for injecting the tip vortex produced by the blade with a mass of linearly directed air. The effects of nozzle geometry, the velocity of injection, the turbulence wavelength, and the angle of injection on the resulting strength of the trailed tip vortex were investigated, and the results are presented in terms of quantitative measurements of the circulation strength as a function of the injected mass of air.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0750634

Entities

People

  • John C. Balcerak
  • Richard P. White Jr.

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Configurations
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Blade Tips
  • Contracts
  • Dynamic Loads
  • Flow Visualization
  • Fluid Dynamics
  • Helicopter Rotors
  • Instrumentation
  • Jet Engines
  • Jet Flow
  • Measurement
  • Physics Laboratories
  • Spars
  • Static Pressure

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Combustion and Flow Dynamics.