NDLI: A model rotor in axial flight

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A model rotor in axial flight

Content Provider	NASA Technical Reports Server (NTRS)
Author	McAlister, K. W. Huang, S. S. Abrego, A. I.
Copyright Year	2001
Description	A model rotor was mounted horizontally in the settling chamber of a wind tunnel to obtain performance and wake structure data under low climb conditions. The immediate wake of the rotor was carefully surveyed using 3-component particle image velocimetry to define the velocity and vortical content of the flow, and used in a subsequent study to validate a theory for the separate determination of induced and profile drag. Measurements were obtained for two collective pitch angles intended to render a predominately induced drag state and another with a marked increase in profile drag. A majority of the azimuthally directed vorticity in the wake was found to be concentrated in the tip vortices. However, adjacent layers of inboard vorticity with opposite sense were clearly present. At low collective, the close proximity of the tip vortex from the previous blade caused the wake from the most recent blade passage to be distorted. The deficit velocity component that was directed along the azimuth of the rotor blade was never more that 15 percent of the rotor tip speed, and except for the region of the tip vortex, appeared to have totally disappeared form the wake left by the previous blade.
File Size	2506471
Page Count	68
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030003701
Archival Resource Key	ark:/13960/t16m86c50
Language	English
Publisher Date	2001-06-01
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Climbing Flight Blade-vortex Interaction Axes of Rotation Induced Drag Pitch Inclination Tip Speed Aircraft Models Rotor Dynamics Rotor Blades Turbomachinery Wind Tunnel Tests Particle Image Velocimetry Angular Velocity Helicopter Wakes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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