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Active flow control device and method for affecting a fluid boundary layer of a wind turbine blade

By installing rotatable and extendable flow effectors on wind turbine blades, combined with vibration drive, the problems of stalling and increased resistance of wind turbine blades are solved, achieving more efficient fluid adhesion and air mixing, improving power output and economy sex.

Inactive Publication Date: 2012-09-05
VESTAS WIND SYSTEMS AS
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] However, the use of vortex generators also results in increased aerodynamic drag of the blades

Method used

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Examples

Experimental program
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Embodiment Construction

[0075] figure 1 A blade 100 (not shown) to be mounted on a wind turbine (not shown) is schematically shown figure 2 Embodiments of the active flow control device 10 in ). The active flow control device 10 comprises: a frame or housing 12 (formed by a cylindrical wall and a bottom); and a pair of finned flow effectors 14 hingedly supported at their tips by a pivot 16 in the housing 12.

[0076] Flow effectors 14 are used to control fluid boundary layer dynamics to counteract and control air boundary layer separation and to provide overall beneficial operation of the blade's flow surface. Flow effectors 14 may also be used for specific purposes at the tip and / or root of the blade.

[0077] Figure 8a An airflow F flowing towards the wind turbine blade 100 and over the blade surface 102 forming the boundary layer BL is schematically shown. exist Figure 8a In the case of Figure 8b The flow F does not reach the trailing edge 101 of the blade 100 when viewed on a larger sca...

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PUM

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Abstract

An active flow control device (10) and a method for affecting a fluid boundary layer of a wind turbine blade (100) are disclosed, as well as a stand-alone module (40) including a plurality of such devices and a wind turbine blade comprising a such devices and / or modules. One or more flow effectors (14) are rotatable back and forth in an oscillating movement (A) in a rotational plane. The flow effectors (14) are also movable in a direction transverse to the rotational plane between a retracted position and an extended position.

Description

technical field [0001] The technical field of the inventive concept is the active control of the fluid boundary layer dynamics of wind turbine blades. [0002] More specifically, the inventive concept relates to active flow control devices and methods for influencing a fluid boundary layer of a wind turbine blade. The inventive concept also relates to a stand-alone module comprising a plurality of such active flow control devices, and to a wind turbine blade comprising a plurality of such active devices or a plurality of such modules. Background technique [0003] It is known to improve the performance of wind turbines by utilizing vortex generators on the turbine blades. Vortex generators are used to pull faster flowing air from the free air stream into the boundary layer to avoid flow separation and premature stall by providing a strongly turbulent boundary layer. [0004] When flow flows from a leading edge to a trailing edge on a surface it is called "attached" (see F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D7/02F03D1/06
CPCY02E10/723F03D7/0252F05B2260/96F03D1/0608F05B2270/606F05B2240/32F05B2260/901F05B2240/31F05B2270/20Y02E10/721F03D7/0256Y02E10/72F05B2240/3062F05B2240/122
Owner VESTAS WIND SYSTEMS AS
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