A design method for deflectable sawtooth wing leading edge

Abstract

The invention provides a design method of a deflection leading edge of a serrated wing. The deflection leading edge of the serrated wing includes a serrated segment leading edge body, an inner segment leading edge, a sealing plate, a deflection rotating shaft, a leading edge rear boundary and a fixed wing surface; the serrated segment leading edge body is formed in the steps that two section lines, namely a wing-shaped second curve and a wing-shaped fourth curve, and a wing horizontal line are subjected to multi-section scanning to form a serrated segment wing and the serrated segment wing is cut through the leading edge rear boundary; the inner segment leading edge is formed in the steps that two section lines, namely a wing-shaped first curve and a wing-shaped third curve, and a wing horizontal line are subjected to multi-section scanning to form an inner segment wing and the inner segment wing is cut through the leading edge rear boundary; excellent pneumatic flow control effect can be obtained, and the design of a driving mechanism is easily achieved. At the same time, a deflection motion design method is simple, positioning is accurate, motion forms are simple, the driving mechanism is simple, definition of the design size of the seal plate is simple, the shape of a hook face is simple, the quality of the hook face is easy to guarantee, the distance between the seal plate and the leading edge of the wing is easy to control, and it is ensured that the deflection process of the leading edge of the wing is not interfered.

Description

technical field [0001] The invention relates to the technical field of aircraft design, in particular to a design method for the leading edge of a deflectable sawtooth wing. Background technique [0002] As a high-speed aircraft, the wing sweep angle is generally large. Due to the wing sweep, when flying at high speed, when it reaches a certain angle of attack, the pitching moment is prone to produce instability, that is, the phenomenon of pitching up, and then cause the aircraft to lose control. Due to the stall of the outer wing of the wing, the lift force drops, which in turn causes a sudden nose-up moment; the main mechanism is that the sweep angle accelerates the low-energy airflow boundary layer on the wing surface to gather towards the wingtip. To solve this problem, wing blades and The serrated leading edge optimizes its aerodynamic flow characteristics. The wing knife is a knife-like structure installed on the upper surface of the wing along the course, which can de...

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Problems solved by technology

[0002] As a high-speed aircraft, the wing sweep angle is generally large. Due to the wing sweep, when flying at high speed, when it reaches a certain angle of attack, the pitching moment is prone to produce instability, that is, the phenomenon of pitching up, and then cause the aircraft to lose control. Due to the stall of the outer wing of the wing, the lift force drops, which in turn causes a sudden nose-up moment; the main mechanism is that the sweep angle accelerates the low-energy airflow boundary layer on the wing surface to gather towards the wingtip. To solve this problem, wing blades and The serrated leading edge optimizes its aerodynamic flow characteristics. The wing knife is a knife-like structure installed on the upper surface of the wing along the course, which can delay the angle of attack that occurs when pitching up, but cannot eliminate it; and due to the existence of the wing knife, it is easy to cause the inner wing Stall first, the outer boundary layer still flows to the wingtip, which causes the wing to stall in advance; the design of the serrated leading edge directly affects its effect of suppressing the stall of the outer wing, and determines the optimization characteristics of the airflow of the outer wing, so how to obtain a better The key point is to optimize the aerodynamic characteristics without complicating the leading edge drive mechanism.

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