Wingtip extension for reduction of vortex drag in aircraft

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 23/06 (2006.01)

Patent

CA 2706422

The invention relates to a wingtip extension comprising a leading edge and a trailing edge, which wingtip extension is affixable to an outer end of a wing, wherein the leading edge, at least in some sections, is essentially straight, and the straight section of the leading edge comprises a leading-edge sweep angle that exceeds the leading-edge sweep angle of the wing, and the local depth of the wingtip extension gradually decreases between a connecting region for connection to the wing and the outer end of the wingtip extension. By means of a wingtip extension according to the invention, in a delta wing a vortex burst region is positioned just behind the wingtip, as a result of which vortex burst region the cores of wingtip vortices burst and eventually become unstable, so that as a result of this the wake vortices of the aircraft can be reduced. The invention furthermore relates to a wing, comprising wingtip extensions according to the invention, as well as to an aircraft comprising such a wing.

L'invention concerne une extension en bout d'aile présentant un bord d'attaque et un bord de fuite et pouvant être fixée à une extrémité extérieure d'une aile, le bord d'attaque de ladite extension étant au moins par endroits sensiblement rectiligne, la section rectiligne présentant un angle de flèche de bord d'attaque supérieur à l'angle de flèche de bord d'attaque de l'aile et la profondeur locale de l'extension en bout d'aile décroissant progressivement d'une zone de jonction avec l'aile jusqu'à l'extrémité extérieure de l'extension en bout d'aile. Grâce à une extension en bout d'aile selon l'invention, une zone d'éclatement tourbillonnaire est positionnée juste derrière le bout d'aile comme sur une aile delta, de sorte que des tourbillons marginaux éclatent au niveau de leur noyau puis finissent par devenir instables, ce qui permet de réduire les traînées tourbillonnnaires de l'avion. L'invention concerne également des ailes munies d'une extension en bout d'aile selon l'invention ainsi qu'un avion équipé de ces ailes.

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