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Experimental Study of Rotor Wake/Body Interactions in Hover

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Experiments were conducted to document the tip vortex geometries and interactional effects between a hovering rotor and s body representing a simplified helicopter fuselage. The wide‐field shadowgraph technique was used to visualize the rotor tip vortices and to obtain quantitative information on the trajectories, with and without the presence of the body. It was found that the effects of the body caused significant changes to both the radial contraction and axial displacements of the tip vortices compared to the isolated case. Direct impingement of the tip vortices an the body surface was also observed, and found to cause large local wake deformations. The rotor performance was significantly affected by the body, producing a higher figure of merit relative to the isolated case.
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Document Type: Research Article

Affiliations: Ctr. for Rotorcraft Education and Research, Dept. of Aerospace Engineering, Univ. of Maryland, College Park, Md.

Publication date: 1992-10-01

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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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