Anti-vibration turbulent flow device of wind turbine generator blade

Abstract

The invention discloses an anti-vibration turbulent flow device of a wind turbine generator blade. The anti-vibration turbulent flow device comprises net sleeves, traction ropes, locking ropes and turbulent flow strips. The net sleeves include the first net sleeve and the second net sleeve. The first net sleeve is arranged on the surface of the blade in a sleeving mode and is bound to a handrail on the outer side of a hub of a wind turbine generator through the traction ropes. The turbulent flow strips are fixed to the first net sleeve through the locking ropes and distributed in the length direction of the first net sleeve, and every two adjacent turbulent flow strips are of a splayed symmetrical structure. The second net sleeve is arranged on the first net sleeve in a sleeving mode and covers the turbulent flow strips in a sleeving mode, namely, the first net sleeve, the turbulent flow strips and the second net sleeve form a sandwich structure. The second net sleeve is fixedly connected with the turbulent flow strips through the locking ropes so that the turbulent flow strips can be better attached to the surface of the blade. The sandwich structure formed by the first net sleeve, the turbulent flow strips and the second net sleeve can provide a non-aerodynamic outer surface for the blade, and therefore the airflow penetrating through the blade is induced to generate turbulent flow, the aerodynamic damping in the swing vibration direction is increased, and then the blade is effectively prevented against vortex-induced vibration.

Description

technical field [0001] The invention relates to the technical field of anti-vibration of wind turbine blades, in particular to an anti-vibration and flow disturbance device for wind turbine blades. Background technique [0002] For any non-streamlined object, at a certain constant flow rate, the two sides of the structure will alternately generate shedding vortices. This alternate vortex will cause the structure to be subject to the pulsating pressure that changes periodically in the flow direction and lateral direction. The pulsating pressure If the frequency is close to the natural frequency of the structure, it will cause periodic vibration of the structure, and the vibration of the structure will in turn change its wake structure and aggravate the detachment of the surface vortex. This phenomenon of mutual coupling between fluid and structure is called "vortex induced vibration". [0003] The shutdown state of the wind turbine can be divided into the shutdown state with...

AI Technical Summary

Problems solved by technology

Although the blade structure has special elasticity and strength, if the amplitude of the vortex-induced vibration is too large and the time is too long, the vortex-induced vibration may cause damage to the blade, which may take a lot of time for maintenance, resulting in large economic losses

Wind turbines may last for a long time without power, and there is currently no effective means to prevent vortex-induced vibration of blades during the power-off state of wind turbines

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