Duct aerofoil system and aerial craft applying duct aerofoil system

Abstract

The invention discloses a duct aerofoil system which comprises a duct aerofoil and a fan arranged on the front edge of the duct aerofoil. The duct aerofoil has an annular structure; a longitudinal cross section of the duct aerofoil is in an airfoil shape; when fan blades rotate to the lower half part of the duct aerofoil, blade tips of the fan blades are higher than the front edge of the lower half part of the duct aerofoil; when the fan blades rotate to the upper half part of the duct aerofoil, the fan blades are positioned in an outer space of the upper half part of the duct aerofoil; and the blade tips of the fan blades are higher than the outer wall of the front edge part of the upper half part of the duct aerofoil. The fan of the duct aerofoil system can simultaneously accelerate theair flow on the surface of the inner wall of the lower half part of the duct aerofoil of the annular structure and the air flow on the surfaces of the inner wall and the outer wall of the upper half part so as to generate a huge lifting force; high lift devices such as flap on the back edge of the duct aerofoil and the like downwards deflect so that the slip flow of the fan can be spurted backwards and a frontward-upward pushing force is generated; an aerial craft applying the duct aerofoil system can achieve vertical rise and fall, horizontal flying, and the stable transition between a vertical rise and fall state and a horizontal flying state.

Description

technical field [0001] The invention relates to a wing, in particular to a ducted wing system and an aircraft using the ducted wing system. Background technique [0002] American Custer designed and manufactured the grooved wing aircraft in the 1940s, which is an ultra-short take-off and landing aircraft that obtains high lift by actively accelerating the airflow. The concept of the grooved wing is to actively accelerate the grooved aircraft The airflow on the upper surface of the wing obtains lift instead of passing through the airflow like conventional aircraft wings. The wing of this aircraft is designed in the shape of a semicircular groove that is curved downward in the part adjacent to the fuselage, and the engine is placed in the semicircular depression. In this way, after the engine is started, the groove will effectively limit the slipstream formed behind the engine propeller, and generate a large suction force in the groove area to obtain a large lift. However, th...

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Problems solved by technology

In this way, after the engine is started, the groove will effectively limit the slipstream formed behind the engine propeller, and generate a large suction force in the groove area to obtain a large lift. However, the grooved wing aircraft can only take off and land at a short distance, not vertically. ups and downs

[0003] American Muller designed and manufactured the m400 in the 1990s. The m400 has four ducted fans arranged symmetrically on both sides of the aircraft fuselage. The ducted shell gradually transitions from a circular shape at the front edge to a rectangular shape at the rear edge. And the rectangle at the rear edge is inclined backward from bottom to top, and louver-type guide vanes are arranged in parallel. When the ducted fan is tilted to an inclined angle, the slip flow of the fan passing through the louver-type guide vanes is ejected downward, generating an upward flow. The force makes the aircraft rise vertically. Muller hopes that the ducted shell can generate lift to maintain the horizontal flight of the aircraft after gradually tilting the ducted fan to a horizontal state. However, the lift generated by his ordinary shaped ducted shell is limited and cannot Maintain the level flight of the aircraft, and the tilting mechanism is complicated and heavy

[0004] The Breguet 941 produced by the French Breguet company in the 1960s used the lift flap technology to deflect the propeller slipstream with a larger flap, so that the slipstream deflected downward to generate upward lift. The lift generated on the wings enables the aircraft to take off and land short distances, but this aircraft cannot take off and land vertically

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