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A synchronous strobed laser light sheet for helicopter model rotor flow visualizationA synchronous, strobed laser light sheet has been developed for use in flow visualization of a helicopter rotor model. The light sheet strobe circuit included selectable blade position, strobe duration, and multiple pulses per revolution for rotors having 2 to 9 blades. The flow was seeded with propylene glycol. Between runs, a calibration grid board was placed in the plane of the laser sheet and recorded with the video camera at the position used to record the flow field. A slip-sync mode permitted slow motion visualization of the flow field over complete rotations of the rotor. The system was used to make two-dimensional flow field cuts of a four-bladed rotor operating at advance ratio of 0.37 at wind tunnel speeds up to 79.25 meters per second (260 feet per second).
Document ID
19910040156
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Leighty, Bradley D.
(NASA Langley Research Center Hampton, VA, United States)
Rhodes, David B.
(NASA Langley Research Center Hampton, VA, United States)
Jones, Stephen B.
(NASA Langley Research Center Hampton, VA, United States)
Franke, John M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: ISA Proceedings
ISSN: 0227-7576
Subject Category
Instrumentation And Photography
Accession Number
91A24779
Distribution Limits
Public
Copyright
Other

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