Airfoil profile with sharp leading edge, heavy camber, low Reynolds number and high lift drag ratio

Abstract

The invention discloses an airfoil profile with the sharp leading edge, heavy camber, low Reynolds number and high lift drag ratio, and relates to a low-Reynolds-number airfoil profile. According to the airfoil profile, the maximum thickness meets the relation of d / c=0.09, the maximum thickness position meets the relation of xd / c=0.274, the maximum camber meets the relation of f / c=0.0595, and themaximum camber position meets the relation of xf / c=0.527, wherein c is the chord length of the airfoil profile, d is the maximum thickness of the airfoil profile, and f is the maximum camber of the airfoil profile; and the connection point of the upper surface and the lower surface of the airfoil profile at the leading edge is the coordinate origin, the axis where the chord length of the airfoil profile is located is the x-axis, xd is the horizontal coordinate of the maximum thickness position, and xf is the horizontal coordinate of the maximum camber position. The airfoil profile abandons a blunt head shape of a conventional airfoil profile, and adopts the sharp leading edge, thus the wetting area is reduced, resistance is greatly reduced, and the lift coefficient of the airfoil profile is linearly changed before the stall; and meanwhile, the airfoil profile has the characteristic of heavy camber, a negative pressure area in the upper surface of the airfoil profile is generated through the heavy camber, and thus the characteristic of high lift is achieved.

Description

technical field [0001] The invention relates to a low Reynolds number airfoil, in particular to a low Reynolds number high lift-to-drag ratio airfoil with a sharp leading edge and large camber. Background technique [0002] The Reynolds number is used in aerodynamics to represent the ratio of air inertial force to viscous force, and the Reynolds number in the cruising state of large passenger aircraft and transport aircraft is on the order of tens of millions. Low Reynolds number flow (Reynolds number below 500,000) also widely exists, such as small wind turbines, micro aircraft, small unmanned aerial vehicles, near space vehicles, etc. However, the aerodynamic performance of airfoils is seriously affected by low Reynolds numbers, and airfoils that perform well at high Reynolds numbers tend to perform poorly at low Reynolds numbers. Under the low Reynolds number flow, the air is prone to separation and reattachment under the influence of the reverse pressure gradient, formi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor performance of conventional airfoils in low Reynolds number environments, to provide a low Reynolds number high lift-to-drag ratio airfoil with sharp leading edge and large camber, which not only conforms to the flow characteristics of low Reynolds number, but also has high lift Force, low drag characteristics, improving the efficiency of low Reynolds number aircraft

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