All composite wingtip winglet for high-aspect-ratio wing

Abstract

An all composite wingtip winglet for a high-aspect-ratio wing comprises a skin (1), a foam core (2), an edge sealing rib (3) and a circular tube (4). The skin (1) is of a cylindrical cavity structure,the foam core (2) is arranged in the cavity of the skin (1), the edge sealing rib (3) is arranged on the edge of the cavity of the skin (1), the circular tube (4) is arranged in the foam core (2), one end of the circular tube (4) is connected to the opening of the outer side face of the skin (1), the other end of the circular tube (4) is connected to the opening of the edge sealing rib (3), a navigation light (5) is installed on the opening of the outer side face of the skin (1) and communicates with the circular tube (4), and the line of the navigation light (5) passes through the opening ofthe edge sealing rib (3) through the circular tube (4) to the main airfoil of the wing. High-altitude long-endurance unmanned aerial vehicles generally adopt large-aspect-ratio wings, and when beingapplied to the high-altitude long-endurance unmanned aerial vehicles, the all composite wingtip winglet for the high-aspect-ratio wing can effectively improve the aerodynamic efficiency of the unmanned aerial vehicles, reduce the induced resistance, and provide an installation platform for a navigation light and a wick discharger, to fulfill the corresponding functions of the navigation light andthe wick discharger.

Description

technical field [0001] The invention belongs to the technical field of aviation composite material structures, and in particular relates to an all-composite material winglet suitable for a wing with a large aspect ratio. 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. As a result, the pressure difference between the upper and lower surfaces of the wing near the wingtip decreases, resulting in a decrease in the lift generated in this area. In order to weaken the influence of this flow around the lift, many aircrafts are equipped with winglets on the wingtips to block the air flow around the upper and lower surfaces, reduce the induced drag ...

AI Technical Summary

Problems solved by technology

Due to the small body of the UAV and the relatively low height of the wings, the internal space of the winglet is very small, and it is impossible to adopt the design scheme of aluminum alloy frame and composite material skin like civil aviation aircraft. At the same time, the winglet must meet Design requirements for light weight, high rigidity, and good workmanship, and installation requirements for systems such as navigation lights and discharge brushes, how to design winglets suitable for wings with large aspect ratios has become a constraint for high-altitude and long-endurance UAVs. developmental design challenges

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