APPROXIMATE SOLUTIONS FOR COMPUTING HELICOPTER HARMONIC AIRLOADS

Abstract

Assuming a constant circulation, rigid, trailing wake and using a lift deficiency function to represent the unsteady aerodynamic effects, various methods of calculating the airloads on a helicopter rotor in steady, forward flight were developed for the purpose of achieving: (a) faster solution times for a given level of accuracy and (b) a more accurate representation of the lifting surface/vortex interaction for the case where the blade passes close to the vortex line generated by a previous blade. Since most of the solution time is required to calculate the induced velocities due to the trailing wake, various approximate methods of calculating the induced velocities due to a rigid, skewed helix were developed.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1965
Accession Number
AD0636928

Entities

People

  • Michael P. Scully

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Computers
  • Digital Computers
  • Downwash
  • Experimental Data
  • Geometry
  • Harmonic Analysis
  • Harmonics
  • Helicopter Rotors
  • Helicopters
  • Intervals
  • Lifting Surfaces
  • Numerical Integration
  • Surfaces
  • Trailing Vortices
  • Two Dimensional
  • Vortices

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Computational Modeling and Simulation