A biomimetic wave leading edge wing tip winglet device

Abstract

A biomimetic wave leading edge wing tip winglet device includes a fin leading edge segment, a top rectifier section and a transition section, The leading edge section of the fin is a multi-sectional curved surface with two opened ends, one side of the leading edge section of the fin is of a wave structure, the top rectifier section is fixed on the top of the leading edge section of the fin to close the top of the leading edge section of the fin, the bottom of the leading edge section of the fin is provided with a transition section, and the transition section is arranged on the wing, the leading edge section of the fin, the top rectifier section and the transition section form a wing tip small wing. As that lead edge of the tip winglet forms regular bump, the uniform incoming flow can generate vortices with opposite rotational directions and high energy at high angle of attack, thereby maintaining airflow adhesion on the winglet, delay airflow separation and development, finally delaying the stall angle of attack of the wing, increasing the maximum lift coefficient, and achieving the purpose of shortening the takeoff distance.

Description

technical field [0001] The invention relates to a bionic wave leading edge winglet device. Background technique [0002] Winglets are one of the main technical means for aircraft to reduce induced drag, reduce fuel consumption and increase flight range. This is because the winglets can block the air flow from the lower surface of the wing to the upper surface, which greatly weakens the strength of the wingtip vortex, thereby reducing the downwash airflow caused by the wingtip vortex, thereby effectively weakening the airflow of the aircraft. The induced drag of the wing is widely used in passenger aircraft and transport aircraft. Installing winglets can achieve the same drag reduction effect as increasing the wingspan, but as the angle of attack increases, the airflow on the upper surface of the winglets will separate before the main wing, and then induce the separation of the main wing, which will seriously Affects the aerodynamic performance of the wing at high angles of...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technology of "improving the aerodynamic performance of the wing", many researchers have proposed various design schemes. At present, the integrated winglet commonly used in large and medium-sized civil aircraft has the advantages of high mold manufacturing cost, low aerodynamic efficiency, Problems such as heavy component weight and insufficient reliability

Generally, counterweights need to be installed on the wingtips to offset the flutter characteristics and reinforce the extra structural weight. The above shortcomings hinder the application of winglets on small low-speed aircraft

For example, the patent CN206797703U proposes a winglet of an aircraft, which is formed by bending an aluminum alloy material and fixed on the wingtip by screwing. Suitable for high angle of attack

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