Method for inhibiting noise of downwind type wind generator set based on variable-helical-angle groove

Abstract

A method for inhibiting the noise of a downwind type wind generator set based on a variable-helical-angle groove relates to a cylindrical tower truss wind generator set. The position and length of thegroove are determined on a cylindrical tower truss; on the cylindrical tower truss, the helical angle degree of the groove is determined; and the depth and width of the groove and the geometric shapeof the groove are designed. The method not only can inhibit the development of the Karman vortex street of cylindrical wake flow, but also can perform a drag reducing function. The low frequency noise of a paddle tip part is better inhibited by the variable-helical-angle groove on account of the large noise characteristic of the paddle tip part. The method for inhibiting the noise of the downwindtype wind generator set based on the variable helical angle groove has the advantages that the structure is simple, realization is convenient, an extra complicated control system is not needed, the noise reducing effect is remarkable, and the scheme for inhibiting the noise of the downwind type wind generator set is potential.

Description

technical field [0001] The invention relates to a cylindrical tower wind turbine, in particular to a downwind wind turbine noise suppression method based on variable helix angle slotting. Background technique [0002] As a clean and renewable energy, wind energy has been paid more and more attention, and all countries in the world are vigorously developing wind power. With the continuous expansion of wind power installed capacity, the noise problem of wind turbines has become increasingly prominent. If it is not seriously studied and solved, it will become a major obstacle restricting the development of wind power generation. Wind turbine noise can be divided into mechanical noise and aerodynamic noise according to the source. With the improvement of the design and manufacturing level of wind turbines, the mechanical noise of wind turbines has been greatly reduced, but aerodynamic noise is still a difficult problem to solve. The aerodynamic noise of wind turbines can be d...

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Problems solved by technology

Active control method: If the blowing / suction scheme is adopted on the wind turbine tower, it is necessary to arrange blowing / suction devices around the tower and install a complex control system, which increases the cost of equipment and equipment output. probability of failure and requires a large energy input

If the passive control method is adopted, it must first be considered that this control method has effects on the wind rotor in all directions of the tower, and the methods of installing diaphragms and fairings only have control effects on the wake flow in one direction of the cylindrical tower. Therefore, it is not suitable to use

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