Vortex diffusion and dissipation

Details Vortex diffusion and dissipation Vortex diffusion and dissipation

1975-06-23

1977-09-06

Blix, Trygve M.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244200, 244130, B64C 326

Patent

active

040463362

ABSTRACT:
Vortex diffusion means for an aircraft having lift structure rooted therein that extends outboard to a structure tip from which a discrete tip vortex develops when said tip is propelled through the air. A sub-wing extends from the tip of the lift structure. Preferably, the sub-wing has its leading edge or upper lead surface tangent to the upper lead surface of the lift structure and a span axis parallel to the span axis of the lift structure. The sub-wing's chord is sized to equally divide the bound vorticity shed at the tip of the lift structure so that twin discrete vortices are generated. One discrete vortex forms along the streamwise edge of the lift structure's tip and the other forms along the streamwise edge of the sub-wing's tip. The distance between the two vortices is in the range of from 25 to 50% of the local chord of the lift structure.

REFERENCES:
patent: 1464784 (1923-08-01), Tarbox
patent: 1520830 (1924-12-01), Ljungstrom
patent: 2743888 (1956-05-01), Lippisch
patent: 3270988 (1966-09-01), Cone, Jr.
patent: 3411738 (1968-11-01), Sargent
patent: 3592559 (1971-07-01), Ward
patent: 3840199 (1974-10-01), Tibbs

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