A Surface Singularity Method for Rotors in Hover or Climb.

Abstract

A surface singularity potential flow code, ROTAIR, has been assembled for the calculation of detailed surface pressures on rotors in hover or climb. This method is basically a marriage of two codes: the fixed-wing surface singularity doublet code and the rotor lifing-surface code. The program includes a tip vortex separation model. Also, the rotor tip surface is panelled so that pressures are calculated right around the tip-edge surface. Preliminary calculations have verified the capabilities of the program for computing blade surface properties in the presence of a close-vortex passage. Additionally, calculated pressure distributions compare favorably with experimental data for a low aspect ratio two-bladed rotor, and the calculated circulation distribution is consistent with that computed earlier with the lifting-surface code. Finally, the newly developed far-wake doublet model promises to keep computing efforts practical. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1981
Accession Number
ADA109687

Entities

People

  • Brian Maskew
  • J. Michael Summa

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Aspect Ratio
  • Blade Tips
  • Boundary Layer
  • Computer Programs
  • Coordinate Systems
  • Crystal Structure
  • Experimental Data
  • Flow Fields
  • Geometry
  • Helicopter Rotors
  • Helicopters
  • Mach Number
  • Pressure Distribution
  • Rotary Wing Aircraft
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerospace Engineering