Active system for early destruction of trailing vortices

Details Active system for early destruction of trailing vortices Active system for early destruction of trailing vortices

1997-11-05

2000-07-04

Wesson, Theresa M.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244201, 244203, B64C 2306, B64C 900, B64C 1316

Patent

active

060826797

ABSTRACT:
An active control method and apparatus for encouraging the early destruction of trailing vortices formed by a lifting body having at least two control surfaces on each side and creating multiple vortex pairs is provided. The method includes actuating the control surfaces in a manner leading to the direct excitation of one or more of the Transient Growth Mechanism, the Short Wavelength Instability, the Long Wavelength Instability, and the Crow Instability to result in the accelerated breakup of the trailing vortices. A method of selecting control parameters in an active control system includes identifying the near-field vorticity distribution of the aircraft, selecting at least one amplification mechanism for distorting the trailing vortices, determining amplitudes and wavelengths for imposed vortex perturbations, simulating trailing vortex evolutions, determining effectiveness of perturbations and amplification mechanisms, determining vortex positions as a function of control surface deflections, and determining control parameters to govern the movement of the wing control surfaces.

REFERENCES:
patent: 2125738 (1938-08-01), Rose
patent: 3411738 (1968-11-01), Sargent
patent: 3596854 (1971-08-01), Haney, Jr.
patent: 3692259 (1972-09-01), Yuan
patent: 3712564 (1973-01-01), Rethorst
patent: 3904151 (1975-09-01), Rethorst
patent: 3997132 (1976-12-01), Erwin
patent: 4108403 (1978-08-01), Finch
patent: 4477042 (1984-10-01), Griswold
patent: 4813631 (1989-03-01), Gratzer
patent: 4917332 (1990-04-01), Patterson
patent: 5150859 (1992-09-01), Ransick
patent: 5158251 (1992-10-01), Taylor
patent: 5209438 (1993-05-01), Wygnanski
patent: 5297764 (1994-03-01), Haney
patent: 5492289 (1996-02-01), Nosenchuck et al.
Crow, S.C., "Stability Theory for a Pair of Trailing Vortices," AIAA Journal, vol. 8, No. 12, pp. 2172-2179. Dec. 1970.
Crow, S.C. et al., Panel Discussion, pp. 577-582 (1971).
Bilanin, A.J. et al., "Aircraft Wake Dissipation by Sinusoidal Instability and Vortex Breakdown," AIAA 11th Aerospace Sciences Meeting, Washington, D.C., Paper No. 73-107, Jan. 10-12 (1973).
Carbaugh, D. et al., "Wake Turbulence," Airliner, Jan.-Mar. Mar. 1995.
Crow, S.C. et al., "Lifespan of Trailing Vortices in a Turbulent Atmosphere," J. Aircraft, vol. 13, No. 7, pp. 476-482. Jul. 1976.
Crouch, J.D., "Instability and Transient Growth for Two Trailing-Vortex Paris," 35th Aerospace Sciences Meeting & Exhibit, Reno, Nevada, Jan. 6-10. Jan. 1997.

Affiliated with

Also associated with

Rating

Active system for early destruction of trailing vortices does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active system for early destruction of trailing vortices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active system for early destruction of trailing vortices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1478841