Vertical shaft wind turbine blade with variable trailing edge, and vertical shaft wind turbine

Abstract

The invention discloses a vertical shaft wind turbine blade with a variable trailing edge, and a vertical shaft wind turbine, and relates to the technical field of vertical shaft wind turbines. The vertical shaft wind turbine blade comprises a blade main body and the variable trailing edge hinged to the blade main body, and a driving motor used for driving the variable trailing edge to swing is further installed on the blade main body; and an angle-of-attack sensor is installed on a blade bracket, and used for measuring the wind direction near the blade in real time. According to the verticalshaft wind turbine blade, the wind direction information is obtained through the angle-of-attack sensor, and the variable trailing edge is actively regulated to swing, so that the adaption of the blade shape is changed; compared with a fixed blade, the wind turbine blade has the function of inhibiting the dynamic stall, and the structure vibration and noise can be reduced, so that the vertical shaft wind turbine is operated stably; meanwhile, in the static state of the vertical shaft wind turbine, when a wind field meet power generation conditions, the wind turbine can be added to self-start through regulation of the variable trailing edge, and additional auxiliary device is not required.

Description

technical field [0001] The invention relates to the technical field of vertical axis wind turbines, in particular to a vertical axis wind turbine blade with a variable trailing edge and a vertical axis wind turbine. Background technique [0002] Vertical-axis wind turbines are currently a hot topic in the field of wind energy research. Compared with horizontal-axis wind turbines, vertical-axis wind turbines have the advantages of less demanding wind direction, better maintainability of generator sets, and lower noise. When the vertical axis wind turbine is running, the blades move periodically around the axis perpendicular to the wind direction, and during the rotation of the blades, the angle of attack of the blades changes in an unsteady period, and the angle of attack of the blades even alternates within a range close to ±90° changes; while the existing curved airfoil blades can only produce high lift under specific incoming flow conditions, and the dynamic change of inco...

AI Technical Summary

Problems solved by technology

When the vertical axis wind turbine is running, the blades move periodically around the axis perpendicular to the wind direction, and during the rotation of the blades, the angle of attack of the blades changes in an unsteady period, and the angle of attack of the blades even alternates within a range close to ±90° changes; while the existing curved airfoil blades can only produce high lift under specific incoming flow conditions, and the dynamic change of incoming flow conditions makes the curved airfoil blades unable to produce better aerodynamic force during the entire rotation cycle Therefore, the existing vertical axis wind turbine blades generally adopt symmetrical airfoils, such as NACA0015 (symmetrical airfoils with a relative thickness of 15%)

[0003] In addition, due to the periodic change of the angle of attack of the vertical axis wind turbine blades, the flow around the vertical axis wind turbine blades will undergo a dynamic stall, and the dynamic stall phenomenon will cause the loss of aerodynamic performance, and cause structural vibration of the vertical axis wind turbine, resulting in additional noise , when the vibration is severe, it may even cause structural damage; at the same time, the existing vertical axis wind turbine cannot start automatically, that is, it must be assisted by external force from a static state to a running state

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