"Visualization of Rate Dependent Vortex Phenomena During Aircraft Maneuvers"
John C. Magill, Leigh Ann Darden, Narayanan M. Komerath
AIAA Paper 94-0669, January 1994
Vortex flow interactions occurring near the vertical fins of a modern fighter
configuration during pitch, yaw, and coupled pitch-yaw motions are explored.
Such motions are produced using a two-degree-of-freedom Wind-Driven Dynamic
Manipulator, under open loop radio control in a low-speed wind tunnel. Laser
sheet videography is used to capture the flow features, which are then extracted
by analyzing sequences of digitized video on a computer. Selected pitch maneuver
sequences are analyzed to examine rate effects on vortex trajectory. Large
asymmetry and complex interactions are observed in the flowfield. Vortices
generated by the forebody, wing leading edge, wing tip, and vertical fins
are seen to interact during the coupled pitch-yaw maneuver. However, no significant
rate effects were seen in the vortex locations at the trailing edge plane
for reduced frequencies up to 0.36 based on wing span.
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