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Rotor Tip Vortex Geometry Measurements Using the Wide‐Field Shadowgraph Technique

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Rotor tip vortex geometry data have been acquired using the wide‐field shadowgraph technique. Shadowgraphs were taken of the wakes of two model main‐rotor systems in hover. These shadowgraphs provided detailed tip vortex trajectories from which axial and radial vortex coordinates were measured. Another result of the experimental work was the development of a method to predict the degree of visibility of rotor tip vortices on shadowgraphs. Using this method, the ability of the shadowgraph technique to visualize tip vortices in the rotor wake was quantified.
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Document Type: Research Article

Affiliations: NASA Ames Research Center, Moffett Field, Calif.

Publication date: 1987-04-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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