Horizontal shaft wind turbine free of blade tip eddies

Abstract

The invention relates to a horizontal shaft wind turbine free of blade tip eddies. The horizontal shaft wind turbine is composed of wind turbine blades, a fairing, a hub, a cabin, arc-shaped bent plates, a tower and the like. Under the successive and combined action of the blades and the arc-shaped bent plates installed on the suction surfaces of the blades, flowing, in the span-wise directions of the blades, of the air is reduced, the air can flow on the blades in the mode of being attached to the wing section better, and therefore the wind turbine has the optimum hydrodynamic force field, and the working capacity of the blades is improved. Meanwhile, variable pitch starting, critical attack angle high speed operation and feathering position stopping of the blades can be achieved through a variable pitch direction adjustment device, and the rotation speed can be flexibly controlled. The wind turbine is high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of wind turbines, and in particular relates to a horizontal axis wind turbine without tip vortex generation. Background technique [0002] At present, wind turbines mainly use wind kinetic energy to do work. When this kind of wind turbine is at low wind speed, the pressure difference between the pressure surface of the blade surface and the suction surface is not very large, so the airflow on the blade basically adheres to the surface of the blade. The wind turbine blades near the hub need to meet the structural strength requirements in addition to ensuring the aerodynamic design requirements. Increasing the thickness of the airfoil is one of the solutions to the problem, that is, a thick airfoil is used in the area near the blade root, but as the wind speed increases, the thickness Airfoils are prone to separation and tip vortices are likely to occur, resulting in reduced wind energy absorption capacity, w...

AI Technical Summary

Problems solved by technology

The wind turbine blades near the hub need to meet the structural strength requirements in addition to ensuring the aerodynamic design requirements. Increasing the thickness of the airfoil is one of the solutions to the problem, that is, a thick airfoil is used in the area near the blade root, but as the wind speed increases, the thickness Airfoils are prone to separation and tip vortices are likely to occur, resulting in reduced wind energy absorption capacity, which will inevitably affect power output

Although the three-dimensional rotation effect of the blade can delay the stall to a certain extent and make up for the reduction of the lift force, the flow near the blade becomes more complicated due to the rotation effect, and the separation effect still dominates

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