Thickened wind turbine blade with high pneumatic performance

Abstract

The invention discloses a thickened wind turbine blade with high pneumatic performance, which belongs to the technical field of wind energy utilization. A three-dimensional structure on the surface of a blade wing-shaped part is generated by continuous and smooth transition of ten wing-shaped surface wing-type curves; each wing-shaped surface wing-type curve consists of a leeward surface curve and a windward surface curve respectively; an original point of a coordinate system is defined as the front edge point of a first wing-shaped surface wing-type curve; the leafing direction of the blade is defined as the positive direction of an axis Z; the direction of a wind wheel shaft is defined as the direction of an axis Y; another direction which is vertical to the directions of the axis Z and the axis Y is defined as the direction of an axis X; ten wing-shaped surfaces are parallel to a plane X0Y respectively, and are arranged in sequence along the positive direction of the axis Z; the ten wing-shaped surfaces rotate by certain angles by taking the front edge points in a plane which crosses respective front edge points and is vertical to the axis Z. According to the thickened wind turbine blade, the front and back edge points of blade wings are thickened, so that the blade has high bending resistance and fatigue damage resistance on the premise of ensuring high pneumatic performance; meanwhile, the blade has the characteristics of low starting air speed and low working noise.

Description

technical field [0001] The invention relates to a wind turbine blade, in particular to a thickened wind turbine blade, and belongs to the technical field of wind energy utilization. Background technique [0002] A wind turbine is a device that absorbs wind energy through the blades of the wind rotor, and then converts mechanical energy into electrical energy. The wind rotor is the key power component of the wind turbine, which determines the efficiency of wind energy extraction. The wind rotor is composed of blades, hub and shaft. The generator is connected to the shaft of the wind rotor through the main shaft, and the function is to convert the mechanical energy output by the wind rotor into electrical energy and output it. It can be seen that the blades of the wind rotor determine the wind energy utilization rate of the wind turbine. The wind turbine blade is composed of two parts: the blade airfoil and the blade root. The structure of the blade airfoil determines the ae...

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Problems solved by technology

[0004] 1. When operating at a low Reynolds number, the leading edge of the blade is more sensitive to roughness changes, and the lift-to-drag ratio deteriorates seriously, which greatly affects the stability of its power output

[0005] 2. In a wide tip speed ratio range, the power coefficient change is prone to fluctuations, and stalling is prone to occur, and the power peak also has large fluctuations

[0006] 3. The start-up wind speed requirements of wind turbines are relatively high, which is not suitable for the utilization of low-speed wind energy resources

[0007] 4. The utilization rate of wind energy is low, resulting in a

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