Passively-controlled movable blade tip small wing device

Abstract

The invention discloses a passively-controlled movable blade tip small wing device. The passively-controlled movable blade tip small wing device is composed of blades (2) and small wings (1), each small wing (1) is installed on one side of the corresponding blade (2), a torsion bracket (3) is arranged between each small wing (1) and the corresponding blade (2), and torsion springs (4) are arrangedbetween each small wing (1) and the corresponding torsion bracket (3); small wing connecting buckles (10) are installed on each small wing root (7), and small wing locking devices (13) are installedon the small wing connecting buckles (10); and a supporting plate (17) is installed between two webs of each blade (2), a bearing (18) is installed at the center of each supporting plate (17), the twoends of each axial spring (5) are connected with the corresponding supporting plate (17) and the corresponding torsion bracket (3), and each axial spring (5) is provided with an axial spring fixing boss (19) and an axial spring shaft rotating groove (15). The passively-controlled movable blade tip small wing device has the beneficial effects that the structural design is reasonable and simple, the manufacturing cost is low, maintaining is convenient, the blades can be protected against interference, the using range is wide, and energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a passively controlled movable blade tip small wing device. Background technique [0002] When the wind turbine is running normally, the airflow on the pressure surface near the blade tip will bypass the tip of the blade and flow to the suction surface, generating blade tip vortices, which will reduce the thrust of the blade tip and reduce the output power of the wind turbine. Small wings are added to the tip of the blade to prevent the air flow around the upper and lower surfaces, reduce the induced resistance caused by the tip vortex, reduce the flow around, and increase the pressure difference between the upper and lower surfaces of the blade, so as to increase the thrust and increase the power. output effect. Through numerical simulation, it is found that the fixed winglet has little effect on the power amplification of the wind turbine at low wind speed, but i...

AI Technical Summary

Problems solved by technology

[0003] Although a rotatable winglet is designed in the prior art, the control method of the designed winglet is active control, and the rotation of the winglet is controlled by the steering gear. The cost of the control method is high, the system is complicated, it is not easy to maintain, and the impairs the quality of the blades, and is not suitable for large-scale wind turbine control

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