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Noise lowering method for aerodynamic noise of wind turbine blade

A technology of wind turbine blades and aerodynamic noise, which is applied in the field of noise reduction devices, can solve problems affecting the aerodynamic performance of the airfoil surface, and achieve the effects of facilitating integrated design, weakening diffraction, and obvious noise reduction effects

Inactive Publication Date: 2018-08-24
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the trailing edge of these existing structures has a good noise suppression effect to a certain extent, it will affect the aerodynamic performance of the airfoil surface due to the change of the original shape of the trailing edge of the blade.

Method used

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  • Noise lowering method for aerodynamic noise of wind turbine blade
  • Noise lowering method for aerodynamic noise of wind turbine blade
  • Noise lowering method for aerodynamic noise of wind turbine blade

Examples

Experimental program
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Embodiment 1

[0025] Such as figure 1 As shown, it is the overall structure of the blade, and the overall structure adopts a gradual structure; it is divided into the main body of the blade and the trailing edge of the blade, and the main body of the blade and the trailing edge of the blade are connected as a whole through a connecting structure, as shown in figure 2 shown. The connection structure adopts an internal connection method, so that the main body of the blade is fixedly connected with the trailing edge of the blade, and the surface of the main body of the blade and the trailing edge of the blade is guaranteed to be smooth and gradual.

[0026] In this example, the adoption of the impedance gradient structure is fundamental to solve the noise problem at the trailing edge of the blade. It is composed of sound-transmitting material on the outer surface, a support frame in the middle, and sound-absorbing material filled inside from the outside to the inside; the sound-transmitting ...

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Abstract

The invention discloses a noise lowering method for aerodynamic noise of a wind turbine blade. Due to the impedance gradual changing attribute along with thickness decreasing of a sound absorbing material on the rear edge of the blade, mass point vibration generated by high-speed incoming flow gas nearby the rear edge of the blade is inhibited, and therefore sound diffraction is weakened and it isachieved that noise is lowered. According to the method, the active noise lowering technology is adopted, a noise source is removed fundamentally, and the noise lowering effect is obvious; and it isnot needed to change the shape of the wind turbine blade, and the aerodynamic performance of the blade is not affected. The rear edge structure of the blade is subjected to improved design, the process is simple, cost is low, integrated design is facilitated, and scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of airfoil aerodynamic noise suppression, and in particular relates to noise reduction devices for airfoils such as wind turbine blades, helicopter propeller blades, and aircraft wings. Background technique [0002] Safety, environmental protection and high quality, as an important theme and focus of the development of mechanical engineering in the new century, have become the internal driving force for the rapid development of research and application of noise problems. Noise is the third largest pollution source in human industrial civilization. According to the physical characteristics of noise sources, it can be classified into aerodynamic noise, mechanical noise and electromagnetic noise, among which aerodynamic noise occupies a considerable proportion. In engineering equipment involving flow, such as aircraft and turbomachinery, aerodynamic noise is very common, such as: blades of wind turbines, compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D1/06F04D29/38F04D29/66B64C3/14B64C11/20
CPCB64C3/14B64C11/20F03D1/0675F04D29/388F04D29/663F04D29/664F04D29/666F05B2260/96Y02E10/72Y02P70/50
Inventor 李文建陈鹏陈正武王勇赵鲲赵昱唐道峰卢翔宇田昊
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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