Duct wing system and aircraft using same

Abstract

The invention discloses a duct wing system comprising a duct wing, and a fan arranged at the front edge part of the duct wing, wherein the front edge part of the duct wing is shaped like a ring; the rear edge part of the duct wing is shaped like a trapezoid which is wide in upper part and narrow in lower part; the ring of the front edge part of the duct wing is in smooth connection with the trapezoid which is wide in upper part and narrow in lower part with and arranged at the rear edge part; the fan is a coaxial counter rotating fan and free of race rotation; the inner wall of the ring-shaped front edge part of the duct wing completely wraps the fan to reduce a tip vortex of the fan; meanwhile, the noise is shielded; the duct wing system is relatively safe. A gap communicated with the inner wall surface and the outer wall surface of the duct wing is formed in the upper part of the duct wing; the fan slip flow can enable power of the duct wing to be increased according to the groove wing effect and the gap wing effect. An aircraft using the duct wing system, disclosed by the invention, can vertically take off and land and horizontally fly, the vertical taking off and landing states and the horizontal flight state are stably converted, the duct wing system is good in safety, and good in economical efficiency, and the sight of a pilot is good.

Description

technical field [0001] The invention relates to a duct, in particular to a ducted wing system and an aircraft using the system. Background technique [0002] Chinese invention patent ZL201110086570.3 discloses a ducted wing system and an aircraft using the ducted wing system. The ducted wing system described in the patent includes a ducted wing and a For the fan at the position, the leading edge of the ducted wing is ring-shaped, and the trailing edge is a trapezoid with a wide top and a narrow bottom. The leading edge of the ducted wing, the trailing edge, and the connecting section between the two are taken as a whole. The longitudinal section has an airfoil. The trailing edge of the ducted wing gradually slopes backward from the bottom to the top. The trailing edge of each layer is equipped with trailing edge flaps; the engine driving the fan is installed in the inner space of the ducted wing through a support wing, and the trailing edge of the supporting wing is provide...

AI Technical Summary

Problems solved by technology

[0002] Chinese invention patent ZL201110086570.3 discloses a ducted wing system and an aircraft using the ducted wing system. The ducted wing system described in the patent includes a ducted wing and a For the fan at the position, the leading edge of the ducted wing is ring-shaped, and the trailing edge is a trapezoid with a wide top and a narrow bottom. The leading edge of the ducted wing, the trailing edge, and the connecting section between the two are taken as a whole. The longitudinal section has an airfoil. The trailing edge of the ducted wing gradually slopes backward from the bottom to the top. The trailing edge of each layer is equipped with trailing edge flaps; the engine driving the fan is installed in the inner space of the ducted wing through a support wing, and the trailing edge of the supporting wing is provided with a trailing edge flap; when the fan rotates, it can accelerate the air flow under the ducted wing at the same time. The airflow on the surface of the half inner wall and the surface airflow on the inner and outer walls of the upper half of the ducted wing, and the airflow on the upper and lower surfaces of the accelerated support wing, but the fan of the ducted wing system is a single set, which has slip flow torsion when rotating. Wings and supporting wings have limited power lift capability; since the leading edge of the ducted wing gradually slopes backward from the bottom to the top, the fan blades are located in the lower front half of the ducted wing when they rotate to the lower half of the ducted wing The inner space of the fan blade, the tip of the fan blade is close to the inner wall of the leading edge of the lower half of the ducted wing with a gap as a gap. The vortex at the tip is very weak. In the outer space of the upper part of the front part of the wing, the blade tip vortex is very strong. In this way, the fan blade tip vortex has periodic changes, which will cause strong vibration of the fan and the vibration of the aircraft, which will affect the comfort and cause structural damage. Fatigue; when the fan rotates, some fan blades are exposed outside the duct, the noise will leak out, and it is unsafe; the aircraft using the ducted wing system will have two ducted wing systems symmetrically arranged in the fuselage. When the ducted wing system takes off and lands vertically and flies horizontally, the fan rotates to face the occupants in the cockpit. When foreign matter is inhaled and the fan blades are damaged and ejected, it may cause injury to the occupants; There is a built-in ducted fan that produces lift fan function. Since the built-in ducted fan of the nose is relatively close to the driver and passengers in the front row in the cockpit, when foreign matter is inhaled, the blades of the built-in ducted fan will be damaged. When it is shot out, it may also cause damage to the passengers in the front row of the cockpit; the aircraft with the canard layout needs to maintain a head-up attitude when it takes off and lands vertically, but the built-in ducted fan is set at the nose, and the fan The larger the diameter, the corresponding longer the nose, resulting in poor vision for the pilot when the aircraft is taking off and landing vertically; the larger the fan diameter, the heavier the weight, and it is heavy when flying horizontally, which is not economical

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