Rotor Wake / Wing / Flap Interaction

National Rotorcraft Center / Rotorcraft Center of Excellence

Rotor tip vortices force unsteady flow separation on a stabilator. GTEAG, 1992.


Interactions between complex, vortex-dominated flows, occurring during transient maneuvers of rotorcraft, can still hold nasty surprises. One such is the occurrence of three-dimensional unsteady flow separation when a rotor wake blows down on a lifting wing surface. Having discovered this, we have turned it into a periodic experiment to study the basic phenomena including relative time scales and processes of flow separation and reattachment. Laser sheet images, surface tuft videos, time-averaged and time-resolved surface pressures, and the three components of the phase-resolved (1-degree resolution) velocity field have been obtained.

Animated-GIF Visualization of Vorticity Contours and Velocity Vectors of the Periodic Flow Between a 2-Bladed Rotor and a Full-SpanWing: Data from Laser Velocimetry.

This link will take you to a summary of research on interactional aerodynamics


Related Publications:

Foley, S. M., et al., "A Multi-Diagnostic Approach to Testing V/STOL Craft". AIAA Paper 92-4008, July 1992.

Funk, R.B., et al., "Vortex-Induced Separation on Lifting Surfaces". Proceedings of the 3rd ARO Workshop on Rotorcraft Interactional Aerodynamics, Atlanta, GA. GITAER 94-5, March 1994.

Foley, S.M., et al., "Rotor Wake -Induced Flow Separation on a Lifting Surface" Journal of the American Helicopter Society, Vol. 40, No.2, April 1995, p. 24 - 27.

Funk, R.B., et al., "Rotor Wake Interaction with a Lifting Surface". Proceedings of the American Helicopter Society Annual Forum, Ft. Worth, TX, May 1995.

Funk, Robert B., PhD. Thesis, School of Aerospace Engineering, Georgia Institute of Technology, June 1995.

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