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Wind turbine rotor blade configured for reduced trailing edge noise

A technology of wind turbines and rotor blades, which is applied to wind turbines, wind turbines, engines, etc. in the same direction as the wind, and can solve problems such as large loads

Pending Publication Date: 2022-02-25
VESTAS WIND SYST AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So for example, while longer serrations may be more effective at reducing trailing edge noise, they also place a greater load on the blade

Method used

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  • Wind turbine rotor blade configured for reduced trailing edge noise
  • Wind turbine rotor blade configured for reduced trailing edge noise
  • Wind turbine rotor blade configured for reduced trailing edge noise

Examples

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Embodiment Construction

[0032] In general, embodiments of the present invention provide wind turbine rotor blades with serrated trailing edges that reduce trailing edge noise. These embodiments improve on known methods of preventing noise generation at the trailing edge by combining the serrated trailing edge with surface structures such as fins located upstream of the serrations.

[0033] In this regard, it should be noted that references to "upstream" and "downstream" throughout this specification refer to the intended direction of air flow over the blade when the blade is in use, ie from the leading edge towards the trailing edge.

[0034] The fins are configured to cut or otherwise break up trailing edge bound vortices within the turbulent boundary layer, thus dissipating some of the turbulent energy in the vortices before they reach the saw teeth. Thus, the combination of fins and serrations provides a two-stage noise reduction that reduces trailing edge noise to a greater extent than would be p...

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PUM

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Abstract

Wind turbine rotor blade with reduced trailing edge noise A wind turbine rotor blade is described, the rotor blade extending in a spanwise direction between a root end and a tip end, and extending in a chordwise direction between a leading edge and a trailing edge. The rotor blade comprises a series of serrations projecting from the trailing edge, each serration extending from a base to a tip to define a length of the serration. The rotor blade also comprises a respective distinct set of fins associated with, and arranged adjacent to, each of the serrations, each fin projecting from a surface of the blade and extending between a leading end and a trailing end to define a length of the fin. Each set of fins comprises multiple fins whose trailing ends are in spanwise alignment with, and are located at or upstream of, the base of the serration associated with the set. For each set of fins, each fin of the set has a greater length than the serration associated with the set, and the trailing end of at least one fin lies between spanwise edges of the serration associated with the set.

Description

technical field [0001] The present invention relates generally to wind turbine rotor blades and to improved methods of manufacturing wind turbine rotor blades. In particular, the invention relates to rotor blades configured to generate less trailing edge noise in use. Background technique [0002] The blades of modern utility-scale wind turbines typically have an airfoil profile along most of their length, defining the pressure and suction sides of the blade. In use, the airflow passes across the surface of the blade from the leading edge to the trailing edge of the blade as the rotor turns the airflow. The airflow within the boundary layer that forms around the blade surface is initially laminar but usually becomes turbulent before the air reaches the trailing edge. [0003] As the boundary layer transitions from laminar to turbulent flow, it creates eddies in the process. These vortices then pass over and interact with the trailing edge, creating audible noise as the vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D1/06
CPCF03D1/0608F05B2260/96F05B2240/3042F05B2240/3062F03D1/0633
Inventor M·卡姆卢扎曼J·于罗特
Owner VESTAS WIND SYST AS