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

A technology of variable helix angle and noise suppression, which is applied to the installation/support of wind turbine configuration, wind power generation, mechanical equipment, etc., can solve the problems of increased equipment cost, equipment failure, large energy input, unsuitable use, etc., to achieve reduction The noise effect is remarkable, the effect is convenient to realize, and the structure is simple

Active Publication Date: 2018-12-25
XIAMEN UNIV
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  • Application Information

AI Technical Summary

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 pas

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

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Embodiment Construction

[0035] figure 1 Represents the principle of the tower shadow effect of the downwind wind turbine: when the infinite horizontal incoming flow 1 flows through the downwind wind turbine, the airflow near the cylindrical tower is blocked by the downwind wind turbine cylindrical tower 3, forming a Tathagata flow passing through Speed ​​loss after cylindrical tower 2. The size and vector direction of the airflow blocked by the tower will change, and the vortex 4 that flows through the tower and falls off is formed on both sides of the cylindrical tower. The wake area of ​​the tower will generate unsteady Karman vortex street, forming the velocity deficit area6 after the incoming flow passes through the tower. The unsteady wake area of ​​the tower flows through the blades 5 of the wind turbine, and the vortex 4 shed from the incoming flow passing through the tower interacts with the blades to cause load fluctuations on the surface of the blades and generate low-frequency noise. figur

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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

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Claims

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Application Information

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Owner XIAMEN UNIV
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