Nonlinear Helicopter Rotor Lifting Surface Theory. Part III.

Abstract

The Green's function approach for the subsonic compressible potential flow over a helicopter rotor in hover or steady state vertical climb was examined. Several methods of approach were taken to derive the Green's function. An attempt to derive the Green's function directly from the differential equation written in the non-inertial coordinate system was not successful. However, since the Green's function was known in the inertial system, a transformation of the integral equation for the velocity potential in this system was transformed successfully to the blade fixed coordinate system. The resulting integral equation involves surface derivatives which preclude the use of previous numerical schemes for its solution. A second part of the report includes the results of the second iteration for the force-free wake of a rotor in hover.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1976
Accession Number
ADA034328

Entities

People

  • Hsi F. Chou
  • Jerome B. Fanucci

Organizations

  • West Virginia University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Coordinate Systems
  • Differential Equations
  • Equations
  • Helicopter Rotors
  • Helicopters
  • Inertial Navigation Systems
  • Integral Equations
  • Integrals
  • Lifting Surfaces
  • Potential Flow
  • Steady State
  • Surfaces

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.