Measurements to Understand the Flow Mechanisms Contributing to Tandem Rotor Outwash

Abstract

Downwash and outwash characteristics of a model-scale tandem-rotor system in the presence of the ground were analyzed by identifying and understanding the physical mechanisms contributing to the observed flow field behavior. A building block approach was followed in simplifying the problem, separating the effects of the fuselage, effects of one rotor on the other, etc. Flow field velocities were acquired in a vertical plane at four aircraft azimuths of a small-scale tandem rotor system using the particle image velocimetry (PIV) technique for radial distances up to 4 times the rotor diameter. Results were compared against full-scale CH-47D measurements.

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Document Details

Document Type
Technical Report
Publication Date
May 23, 2015
Accession Number
AD1004039

Entities

People

  • Gloria K. Yamauchi
  • Manikandan Ramasamy
  • Mark Potsdam

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Boundary Layer
  • Computational Fluid Dynamics
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Helicopter Rotors
  • Hydrodynamics
  • Mathematical Models
  • Physics Laboratories
  • Reynolds Number
  • Short Takeoff Aircraft
  • Tilt Rotor Aircraft
  • Tilt Wings
  • Turbulent Mixing

Readers

  • Aerospace Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Systems Analysis and Design