An Investigation of the Quantitative Applicability of Model Helicopter Rotor Wake Patterns Obtained from a Water Tunnel

Abstract

An analytical investigation was conducted to evaluate quantitative applications of available model rotor tip vortex patterns from a water tunnel. This evaluation consisted of reducing selected photographic wake data to coordinate form, and comparing the resulting wake geometries with both theoretical results and available experimental data taken in air. Additionally, the study included an examination of the sensitivity of water tunnel wake geometry to the water tunnel test parameters which did not duplicate full-scale rotor values and the applicability of a water tunnel wake geometry to determine the airloads of a full-scale rotor. Finally, the possibility of developing simplified wake documentation and generalization procedures and improved water tunnel test techniques was assessed.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1971
Accession Number
AD0739946

Entities

People

  • Anton J. Landgrebe
  • Elton D. Bellinger

Organizations

  • United Technologies Corporation

Tags

DTIC Thesaurus Topics

  • Aircrafts
  • Contracts
  • Coordinate Systems
  • Dynamic Response
  • Experimental Data
  • Flight Speeds
  • Flow Visualization
  • Geometry
  • Helicopter Rotors
  • Mach Number
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Resonant Frequency
  • Reynolds Number
  • Short Takeoff Aircraft
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Oceanography.
  • Theoretical Analysis.