High-lift wind turbine airfoil

Abstract

The invention discloses a high-lift wind turbine airfoil. The airfoil is formed by the following steps of: taking an S809 airfoil as a basic profile, multiplying the chord length of an NACA4412 airfoil by a scale factor alpha, shrinking the NACA4412 airfoil, and rotating the shrunk airfoil at a fixed angle beta based on a trailing edge point; and at the trailing edge, when the vertical coordinate of the upper surface of the S809 airfoil is smaller than the vertical coordinate of the NACA4412 airfoil, replacing the upper surface of the part of the S809 airfoil with the surface of the NACA4412 airfoil. According to the high-lift wind turbine airfoil, the middle section position of the upper surface of the airfoil is in smooth transition, and a small adverse pressure gradient of the airfoil under a large angle of attack is guaranteed to inhibit airflow separation, the airfoil has a larger lift coefficient, a larger stalling angle and smaller resistance, and the wind energy absorption efficiency of a wind wheel of a wind generating set is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a high-lift wind power airfoil used for a wind power generating set. Background technique [0002] For the geometric shape of a wind blade, the airfoil is the "gene" of the blade, and its aerodynamic performance directly affects the aerodynamic performance of the wind turbine blade. Therefore, the design of the aerodynamic shape of the wind turbine rotor blade is inseparable from the airfoil design. Before the 1980s, the airfoils of wind turbines often used aviation airfoils. However, aviation airfoils are usually designed under pressure-sonic conditions, and the aerodynamic performance cannot be effectively guaranteed under low-speed conditions. In addition, there are disadvantages that the thickness is small and cannot meet the structural requirements. At the same time, the stall of the airfoil at high angles of attack serious. Therefore, the current...

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Problems solved by technology

However, although this type of airfoil can guarantee a low drag coefficient at a small angle of attack, it is prone to airflow separation at a large angle of attack, thereby reducing the lift coefficient, increasing the drag coefficient, and reducing the wind turbine rotor. Economical, so vertical axis wind turbines are not aerodynamically efficient at low wind speeds

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