High-lift-drag-ratio wind turbine airfoil profile under large attack angle and design method of high-lift-drag-ratio wind turbine airfoil profile

Abstract

The invention belongs to the technical field of wind power generation, and particularly relates to a design method of a high lift-drag ratio wind turbine airfoil under a large attack angle, which is described by a forming process as follows: projecting a reference airfoil profile in an XY coordinate system to obtain a reference airfoil profile, and overlapping a leading edge point of the reference airfoil profile with a coordinate origin to obtain a reference airfoil profile; a slot is formed in the reference airfoil profile; selecting two points on the lower wing surface as the inlet of the slot, and recording as a point a and a point b; selecting two points on the upper wing surface as outlets of the slot, and recording the two points as a point c and a point d; a point e is selected between the point a and the point c, and a point f is selected between the point b and the point d; the aec and the bfd form a slotted shape, and a channel is formed in the middle of the airfoil; ae and bf are straight lines, ec and fd are arcs, and ae is parallel to bf. And a larger stall angle of attack and smaller resistance are realized, and the lift-drag ratio under the large angle of attack is obviously improved, so that the wind energy absorption efficiency of the wind wheel of the 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-to-drag ratio wind turbine airfoil and a design method thereof under a large attack angle. Background technique [0002] For the geometric shape of the 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 blade of the wind turbine cannot be separated from the airfoil design. Before the 1980s, the airfoils of wind turbines often used aviation airfoils. However, aviation airfoils are usually designed under the condition of subsonic speed, and the aerodynamic performance cannot be effectively guaranteed under low speed conditions. In addition, there are disadvantages of small thickness and inability to meet structural requirements. At the same time, the airfoil stalls at high an...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-lift-drag ratio wind turbine airfoil and its design method at a large angle of attack, which solves the problem of easy airflow separation at a high angle of attack, thereby reducing the lift coefficient, increasing the drag coefficient, and reducing the airflow. The economic benefits of wind turbine wind turbines have been compromised, and the aerodynamic efficiency of vertical axis wind turbines is not high at low wind speeds.

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