Calculation of Rotor Blade-Vortex Interaction Airloads Using a Multiple-Trailer Free-Wake Model

Abstract

Analytical results of rotor blade-vortex interaction airloads are presented with two different wake models in the comprehensive analysis CAMRAD II, and these calculated results are compared with the experimental data obtained from the higher-harmonic-control aeroacoustic rotor test (HART-I) program. The HART rotor was a 40%, Mach-scaled model of the hingeless BO-105 main rotor. Two wake models used in the comprehensive analysis are the single-trailer and the multiple-trailer free-wake models. The multiple-trailer wake model shows good prediction of lift distributions, M2cn, as a function of azimuth for baseline, minimum noise, and minimum vibration cases, and shows significant improvement relative to the single-trailer model in prediction of the tip vortex wake geometry.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2003
Accession Number
ADA520345

Entities

People

  • Joon W. Lim
  • Wayne R. Johnson
  • Yung H. Yu

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Aeroacoustics
  • Aerodynamics
  • Aeronautics
  • Aircrafts
  • Airframes
  • Army Aviation
  • Blade Tips
  • Experimental Data
  • Fluid Dynamics
  • Helicopter Rotors
  • Helicopters
  • Mach Number
  • Measurement
  • Miss Distance
  • Rotary Wing Aircraft
  • United States

Fields of Study

  • Physics

Readers

  • Aerodynamics.