Airplane wingtip device with aligned back edges

Abstract

The invention discloses an airplane wingtip device, which comprises a transition part and a wingtip part, wherein the end part of the inner side of the transition part is connected with the far end of an airplane wing; the end part of the outer side of the transition part is connected with the wingtip part; the wingtip part comprises a plurality of wingtip sections; each wingtip section comprises a wingtip and a wing root respectively; the wing root of the first wingtip section is connected with the end part of the outer side of the transition part, and is aligned with the back edge of the end part of the outer side of the transition part; the wing root of the (n+1)th wingtip section is positioned on the wingtip of the nth wingtip section; the chord length of the wing root of the (n+1)th wingtip section is smaller than or equal to that of the wingtip of the nth wingtip section; and n is more than 0. The wingtip device disclosed by the invention is arranged in a step form, and each wingtip is provided with more than one discontinuity surface, so that wingtip vortexes induced from the wingtips suppress one another, the vortex intensity is weakened, and the resistance reducing effect is achieved; moreover, the bending moment increment of the wing roots is smaller, so that the structural weight of the airplane is lightened, and the influence on flutter characteristic is smaller.

Description

technical field [0001] The invention relates to a wingtip device of an aircraft wing. Background technique [0002] The lift required for the aircraft to maintain normal flight is generated by the pressure difference between the upper and lower surfaces of the wing. Due to the existence of the pressure difference between the upper and lower surfaces, the air on the lower surface of the wing near the wingtip will flow around to the upper surface, forming a wingtip vortex, causing the wing The pressure difference between the upper and lower surfaces of the wing in the area near the tip is reduced, resulting in a decrease in the lift generated in this area. [0003] In view of the above problems, winglets (winglets) are usually arranged on the wingtips of the aircraft wings. The main function of the winglets is to increase the effective aspect ratio without increasing the span length of the aircraft. In this way, the two-dimensional effect of the wing is enhanced, the induced ...

AI Technical Summary

Problems solved by technology

[0009] Although the up-trans winglets and wingtip sails have obvious drag reduction effects, both the winglets and the wingtip sails have relatively large bending moments at the root of their wings, which increases their own structural weight, and have some influence on the flutter characteristics of the aircraft

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