The Prediction of Transonic Loading Advancing Helicopter Rotors.

Abstract

Two different schemes are presented for including the effect of rotor wakes on the finite-difference prediction of rotor loads. The first formulation includes wake effects by means of a blade-surface inflow specification. This approach is sufficiently simple to permit coupling of a full-potential finite-difference rotor code to a comprehensive integral model for the rotor wake and blade motion. The coupling involves a transfer of appropriate loads and inflow data between the two computer codes. Results are compared with experimental data for two advancing rotor cases. The second rotor wake modeling scheme in this paper is a'split potential' formulation for computing unsteady blade-vortex interactions. Discrete vortex fields are introduced into a three-dimensional, conservative, full-potential rotor code. Computer predictions are compared with two experimental blade-vortex interaction cases.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA168217

Entities

People

  • C. Tung
  • Roger Strawn

Organizations

  • Ames Research Center

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Army Aviation
  • Boundaries
  • Computations
  • Computer Programs
  • Computers
  • Coordinate Systems
  • Equations
  • Experimental Data
  • Flow
  • Flow Fields
  • Free Stream
  • Geometry
  • Helicopter Rotors
  • Mach Number
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Computational Fluid Dynamics (CFD)