Aeronautics and astronautics – Miscellaneous
Patent
1995-06-08
1998-04-14
Mojica, Virna Lissi
Aeronautics and astronautics
Miscellaneous
244 91, 244199, 244213, B64C 358, B64C 900
Patent
active
057382980
ABSTRACT:
The present invention is directed toward a unique lift-generated noise reduction apparatus. This apparatus includes a plurality of tip fences that are secured to the trailing and leading assemblies of the high-lift system, as close as possible to the discontinuities where the vortices are most likely to form. In one embodiment, these tip fences are secured to some or all of the outboard and inboard tips of the wing slats and flaps. The tip fence includes a generally flat, or an aerodynamically shaped plate or device that could be formed of almost any rigid material, such as metal, wood, plastic, fiber glass, aluminum, etc. In a preferred embodiment, the tip fences extend below and perpendicularly to flaps and the slats to which they are attached, such that these tip fences are aligned with the nominal free stream velocity of the aircraft.
In addition to reducing airframe noise, the tip fence tends to decrease drag and to increase lift, thus improving the overall aerodynamic performance of the aircraft. Another advantage presented by the tip fence lies in the simplicity of its design, its elegance, and its ready ability to fit on the wing components, such as the flaps and the slats. Furthermore, it does not require non-standard materials or fabrication techniques, and it can be readily, easily and inexpensively retrofited on most of the existing aircraft, with minimal design changes.
REFERENCES:
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patent: 2368205 (1945-01-01), Diehl
patent: 4017041 (1977-04-01), Nelson
patent: 4032087 (1977-06-01), Cleaves
patent: 4036452 (1977-07-01), Schairer
patent: 4471925 (1984-09-01), Kunz
patent: 4714215 (1987-12-01), Jupp et al.
patent: 5050822 (1991-09-01), Whitehouse
patent: 5069402 (1991-12-01), Wortman
patent: 5348256 (1994-09-01), Parikh
patent: 5435502 (1995-07-01), Wernicke
patent: 5518210 (1996-05-01), Friberg
"Measurements of Noise Produced by Flow Past Lifting Surfaces", J.M. Kendall, Jet Propulsion Laboratory, AIAA 16th Aerospace Sciences Meeting, pp. 1-10, 1978.
Ross James C.
Storms Bruce L.
Lupuloff Harry
Mannix John G.
Mojica Virna Lissi
The United States of America as represented by the Administrator
Warsh Kenneth L.
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