Rotorcraft, rotorcraft blades and their airfoils

Abstract

The present disclosure relates to a rotorcraft, a blade of the rotorcraft, and an airfoil thereof, wherein the airfoil is composed of a leading edge, a trailing edge, and upper and lower arcs between the leading and trailing edges, and the wing The ratio of the maximum thickness of the airfoil to the chord length of the airfoil is, the maximum thickness is at; The trailing edge distances, , and values ​​have a maximum error of ±3%, respectively. Through the above technical solutions, a higher lift-to-drag ratio can be provided for the rotorcraft at a low Reynolds number, thereby improving the aerodynamic efficiency of the rotorcraft. In addition, due to the improved aerodynamic efficiency of the rotorcraft, under the condition of the same lift surface distribution, the required rotational speed is lower, making it possible to reduce the noise generated during the flight of the rotorcraft.

Description

technical field [0001] The present disclosure relates to the technical field of aircraft, and in particular, to a rotorcraft, a blade of the rotorcraft and an airfoil thereof. Background technique [0002] Improving aerodynamic efficiency is an important task in aircraft design. For rotorcraft, it is necessary to reduce the consumed power as much as possible while producing the same lift, or to generate as much lift as possible while consuming the same power. capabilities are important. [0003] The airfoil is the two-dimensional cross-section perpendicular to the leading edge of the rotor at any position in the span. It is the source of the pressure difference between the upper and lower surfaces of the rotor. It has an important impact on the lift or thrust of the rotor, the level of aerodynamic noise, and even the performance of the aircraft. The existing airfoils are mainly designed for large-scale manned aircraft, and the Reynolds number is generally above 1,000,000, ...

AI Technical Summary

Problems solved by technology

The existing airfoils are mainly designed for large-scale manned aircraft, and the Reynolds number is generally above 1,000,000, while the multi-rotor drones on the market are small in size and low in Reynolds number, generally below 1,000,000. At present, there are few airfoils that can provide excellent aerodynamic efficiency. The airfoils in related technologies generally have low lift coefficient and lift-to-drag ratio at low Reynolds numbers, resulting in low aerodynamic efficiency.

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