Aerodynamic configuration of high subsonic aircraft with M-shaped wings and equipped with braced wings at leading edges

Abstract

The invention discloses an aerodynamic configuration of a high subsonic aircraft with M-shaped wings and equipped with braced wings at leading edges and belongs to the technical field of aerodynamic configuration design of aircraft. The aerodynamic configuration comprises a fuselage, main wings and the braced wings, wherein each main wing is divided into a main wing inner section and a main wing outer section; the main wings are high-mounted wings; the main wing inner sections are forward-swept and the main wing outer sections are back-swept; the main wings form an M shape from a top view; one end of each braced wing is connected with the belly of the fuselage to form a low-mounted wing configuration, and the other end of each braced wing is connected with a joint between the corresponding main wing inner section and the corresponding main wing outer section; the braced wings also have back-swept angles; and the back-swept angles are greater than forward-swept angles of the main wing inner sections. The aerodynamic configuration can significantly reduce the structural weight of the wings and improve the payload and transportation efficiency of the aircraft. From a pneumatic point of view, the aerodynamic configuration can acquire an aspect ratio larger than that of a conventional configuration with same level of materials. The wingspan of the aircraft equipped with the braced wings is significantly larger than the wingspan of a civil aircraft in the prior art. In addition, through the rational arrangement of the braced wings at the leading edges, the lift-drag characteristic of the wings can be in good position to approach the aerodynamic efficiency level without regard for the aerodynamic effect of the braced wings.

Description

technical field [0001] The invention belongs to the technical field of aircraft aerodynamic layout design, and in particular relates to an aerodynamic layout of an M-shaped wing high subsonic aircraft adopting a leading edge support wing. The support wing is arranged at a certain distance in front of the main wing to reduce adverse aerodynamic interference, increase the strength of the wing and then increase the aspect ratio, so that the aircraft has an aerodynamic layout of the aircraft with a higher lift-to-drag ratio at high subsonic speeds. Background technique [0002] High subsonic jet passenger aircraft has become one of the main means of transportation in the world. In 2003, Boeing Company predicted the growth rate of world air transport, and believed that the average annual growth rate of air passenger transport was 5.1%, and the average annual growth rate of cargo was 6.4%. If the aerodynamic efficiency of high subsonic civil jet aircraft can be improved on the ex...

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Problems solved by technology

[0004] However, new problems arise. The support wing will also generate aerodynamic lift and drag, and its interference with the airflow will also affect the lift-drag characteristics of the main wing.

The existing support wing layout scheme is generally as follows Figure 8 As shown, the support wing and the main wing overlap greatly from the top view direction, and there is a strong unfavorable interference between the two wings. Waves reduce the lift of the aircraft, increase the resistance and noise, and greatly reduce the lift-to-drag ratio of the aircraft

This type of supporting wing layout supported directly below has relatively large defects

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