Helicopter rotor wings with commutation net cover

Abstract

The invention discloses helicopter rotor wings with a commutation net cover and a scheme thereof. The rotor wings are rigid blades and are provided with supports on the outer ends, which relieves an up-down brandishing oscillation of a helicopter; the commutation net cover on the rotor wings solves lifting force difference between two sides of the rotor wings during forward flying, and when the helicopter flies forward, air flow forward does not blast the blades directly, changes directions through the commutation net cover and flows downward, thereby solving the problems of relative deceleration of retreating blades and uneven forces between a left lifting force and a right lifting force; the rotor blades can be designed into any shapes beneficial to reducing impact wave resistance, such as arched saber-shaped blades with sharp blade front edge, which effectively improve maneuverability and flight efficiency of the helicopter; the rotor wings is also beneficial to achieving supersonic velocity rotation, which greatly increases the lifting force and the flying speed of the helicopter. By applying the helicopter with the rotor wings, a theoretical limit that speed can not surpass 420 km per hour can be broken down.

Description

Technical field [0001] The invention relates to the field of aviation, in particular to a helicopter rotor system. technical background [0002] A known helicopter rotor is generally composed of several flexible blades, a hub, a swing hinge, a shimmy hinge, etc., and the blades are connected to the rotor shaft through a hinged manner and the hub. As we all know, the rotor moves in a circle. Due to the radius, when the linear velocity at the tip of the blade is already very high, the linear velocity at the center of the circle is zero! Therefore, the place where the rotor is close to the circumference produces the greatest lift, while the place close to the center of the circle only produces a negligible lift. When the blade moves forward, the relative speed of the blade and the air is higher than the linear velocity brought by the rotation itself; conversely, when the blade moves backward, the relative speed of the blade and the air is lower than the linear velocity brought...

AI Technical Summary

Problems solved by technology

The disadvantages of this are: the up and down swing of the blade and the back and forth vibration increase the vibration and noise of the machine body, and reduce the efficiency. The rounded leading edge of the blade increases the shock wave resistance generated by the air, and the outer end of the blade When the linear velocity is close to the speed of sound, the linear velocity at the center of the circle is almost zero, so it is difficult for the blade to break through the sound barrier, so that the rotor cannot break through the sound barrier and rotate at supersonic speed, which limits the flight speed of the rotorcraft; and the outer end of the blade is not supported, the hub The force is too large, and the requirements for the material of the blade are high. In the place where there are big trees in the cliff, canyon, ultra-low altitude, high-rise rescue and other operations, the blade is easy to touch the obstacle, which limits the scope of use of the rotor helicopter.

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