NOISE REDUCER FOR ROTOR BLADE IN WIND TURBINE
A rotor blade assembly for a wind turbine is disclosed. The rotor blade assembly includes a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root. The rotor blade assembly further includes a mounting plate and a noise reducer. The mounting plate is configured on a surface of the rotor blade. The noise reducer may include a base plate and a plurality of noise reduction features. The base plate is mounted to the mounting plate. The plurality of noise reduction features extend from the base plate.
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The present disclosure relates in general to wind turbine rotor blades, and more particularly to noise reducers mounted to the rotor blades.
BACKGROUND OF THE INVENTIONWind power is considered one of the cleanest, most environmentally friendly energy sources presently available, and wind turbines have gained increased attention in this regard. A modern wind turbine typically includes a tower, generator, gearbox, nacelle, and one or more rotor blades. The rotor blades capture kinetic energy of wind using known foil principles. The rotor blades transmit the kinetic energy in the form of rotational energy so as to turn a shaft coupling the rotor blades to a gearbox, or if a gearbox is not used, directly to the generator. The generator then converts the mechanical energy to electrical energy that may be deployed to a utility grid.
In many cases, various components are attached to the rotor blades of wind turbines to perform various functions during operation of the wind turbines. These components may frequently be attached adjacent to the trailing edges of the rotor blades. For example, noise reducers may be attached to the trailing edges of the rotor blades to reduce the noise and increase the efficiency associated with the rotor blade.
Typical prior art noise reducers are mounted directly to a surface of the rotor blade using glue or another suitable adhesive. These noise reducers may have a variety of disadvantages. For example, the noise reducers are generally mounted to rotor blades during manufacturing before the rotor blades are transported to the wind turbine site. The noise reducers are thus easily susceptible to damage during transportation. Additionally, the adhesives used to mount the noise reducers make replacement of the noise reducers difficult, expensive, and time consuming. Further, during operation of a wind turbine, the noise reducers are particularly vulnerable to damage from lightning strikes. The lightning strikes may additionally damage the rotor blade as a result of contact with the noise reducers.
Thus, an improved noise reducer for a rotor blade would be desired. For example, a noise reducer that allows for on-site mounting to a rotor blade would be advantageous. Further, a noise reducer that allows for relatively easy, cost-effective, and efficient replacement would be advantageous. Additionally, a noise reducer that reduces the vulnerability of the noise reducer and rotor blade to damage from lightning strikes would be desired.
BRIEF DESCRIPTION OF THE INVENTIONAspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.
In one embodiment, a rotor blade assembly for a wind turbine is disclosed. The rotor blade assembly includes a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root. The rotor blade assembly further includes a mounting plate and a noise reducer. The mounting plate is configured on a surface of the rotor blade. The noise reducer includes a base plate and a plurality of noise reduction features. The base plate is mounted to the mounting plate. The plurality of noise reduction features extend from the base plate.
In another embodiment, a rotor blade assembly for a wind turbine is disclosed. The rotor blade assembly includes a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the surfaces further defining a rotor blade interior. The rotor blade assembly further includes a lightning protection device, a mounting plate and a noise reducer. The lightning protection device is disposed at least partially in the rotor blade interior. The mounting plate is configured on a surface of the rotor blade and is operatively connected to the lighting protection device. The noise reducer is mounted to the mounting plate.
These and other features, aspects and advantages of the present invention will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures, in which:
Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
Referring to
In some embodiments, the rotor blade 16 may include a plurality of individual blade segments aligned in an end-to-end order from the blade tip 32 to the blade root 34. Each of the individual blade segments may be uniquely configured so that the plurality of blade segments define a complete rotor blade 16 having a designed aerodynamic profile, length, and other desired characteristics. For example, each of the blade segments may have an aerodynamic profile that corresponds to the aerodynamic profile of adjacent blade segments. Thus, the aerodynamic profiles of the blade segments may form a continuous aerodynamic profile of the rotor blade 16. Alternatively, the rotor blade 16 may be formed as a singular, unitary blade having the designed aerodynamic profile, length, and other desired characteristics.
The rotor blade 16 may, in exemplary embodiments, be curved. Curving of the rotor blade 16 may entail bending the rotor blade 16 in a generally flapwise direction and/or in a generally edgewise direction. The flapwise direction may generally be construed as the direction (or the opposite direction) in which the aerodynamic lift acts on the rotor blade 16. The edgewise direction is generally perpendicular to the flapwise direction. Flapwise curvature of the rotor blade 16 is also known as pre-bend, while edgewise curvature is also known as sweep. Thus, a curved rotor blade 16 may be pre-bent and/or swept. Curving may enable the rotor blade 16 to better withstand flapwise and edgewise loads during operation of the wind turbine 10, and may further provide clearance for the rotor blade 16 from the tower 12 during operation of the wind turbine 10.
As illustrated in
As mentioned, the mounting plate 110 may be configured to couple the noise reducer 112 to the rotor blade 16. In exemplary embodiments, the mounting plate 110 may be formed from a metal or metal alloy. For example, the mounting plate 110 may be formed from aluminum. Alternatively, however, the mounting plate 110 may be formed from any suitable material. For example, in some embodiments, the mounting plate 110 may be formed from a material suitable to conduct the electrical current from lightning strikes, as discussed below. Alternatively, the mounting plate 110 may be formed from any material suitable for coupling the noise reducer 112 to the rotor blade 16.
The mounting plate 110 may be configured on a surface of the rotor blade 16. For example, in some embodiments as illustrated in
In exemplary embodiments as shown in
In alternative embodiments, the mounting plate 110 may extend through a surface of the rotor blade 16. For example, the mounting plate 110 may extend through a shell portion of the rotor blade 16 at a desired location, such as at the trailing edge 28, such that a portion of the mounting plate 110 is disposed in the interior 40 of the rotor blade 16, while another portion extends from the rotor blade 16. A suitable adhesive 113 or, alternatively, suitable mechanical fasteners, may be utilized to secure the mounting plate 110 as required.
In further alternative embodiments, the mounting plate 110 may be mounted directly to the exterior of the rotor blade 16 through the use of, for example, a suitable adhesive 113 or suitable mechanical fasteners. For example, the mounting plate 110 may be mounted between the pressure side 22 and the suction side 24, such as, for example, mounted directly to the trailing edge 28.
In other alternative embodiments, as shown in
As shown in
In exemplary embodiments, the mounting plate 110 may be operatively connected to the lightning protection device 120. When the mounting plate 110 and lightning protection device 120 are operatively connected, the lightning protection device 120 may protect the mounting plate 110 and noise reducer 112 from lightning strikes. Thus, for example, the electrical current from lightning striking the mounting plate 110 or the noise reducer 112, discussed below, may flow through the mounting plate 110 to the lightning protection device 120. In some embodiments, a conduction cable 122 or a plurality of conduction cables 122 may be provided to operatively connect the mounting plate 110 to the lightning protection device 120. The conduction cable 122 is connected at one end to the mounting plate 110 and at the other end to the lightning protection device 120. Electrical current from lightning strikes to the mounting plate 110 or the noise reducer 112 may thus flow from the mounting plate 110 through the conduction cable 122 to the lightning protection device 120.
As discussed above, the mounting plate 110 couples the noise reducer 112 to the rotor blade 16. Thus, the noise reducer 112 may be mounted to the mounting plate 110. The noise reducer 112 may be formed from any suitable material for reducing the noise and/or increasing the efficiency associated with the rotor blade 16 and wind turbine 10. In some embodiments, the noise reducer may be formed from a metal or metal alloy, such as aluminum, or from any material suitable to conduct the electrical current from lighting strikes, as discussed above. In alternative embodiments, the noise reducer may be formed from any suitable non-conductive materials, such as from a glass-reinforced plastic composite.
The noise reducer 112 may further include a plurality of noise reduction features 130. As described herein and illustrated in
As shown in
It should be understood that the noise reduction features 130 according to the present disclosure may have any suitable characteristics, such as widths, lengths, shapes, or orientations, depending on the desired noise reduction characteristics for the noise reducer 110. Further, individual noise reduction features 130 may have individual characteristics, or various groups of noise reduction features 130 may have similar characteristics, or all noise reduction features 130 may have similar characteristics, depending on the desired noise reduction characteristics for the noise reducer 110.
In some exemplary embodiments, as shown in
In other embodiments, as shown in
For example,
The embodiments as disclosed above for mounting the noise reducer 112 to the mounting plate 110 may, advantageously, allow for the noise reducers 112 to be efficiently and cost-effectively mounted to rotor blades 16 on-site. Further, the above embodiments may allow for efficient and cost-effective replacement of the noise reducers 112 as required.
It should be understood that, while
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims
1. A rotor blade assembly for a wind turbine, comprising:
- a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root;
- a mounting plate configured on a surface of the rotor blade; and,
- a noise reducer, the noise reducer comprising a base plate and a plurality of noise reduction features, the base plate mounted to the mounting plate, the plurality of noise reduction features extending from the base plate.
2. The rotor blade assembly of claim 1, wherein the mounting plate extends through a surface of the rotor blade.
3. The rotor blade assembly of claim 1, wherein the mounting plate and one of the pressure side and the suction side are co-infused.
4. The rotor blade assembly of claim 1, wherein the mounting plate is disposed between the pressure side and the suction side.
5. The rotor blade assembly of claim 1, wherein the mounting plate is configured on the trailing edge.
6. The rotor blade assembly of claim 1, wherein the surfaces of the rotor blade further define a rotor blade interior, wherein the rotor blade further comprises a lightning protection device disposed at least partially in the rotor blade interior, and wherein the mounting plate is operatively connected to the lighting protection device.
7. The rotor blade assembly of claim 6, further comprising a conduction cable operatively connecting the mounting plate to the lightning protection device.
8. The rotor blade assembly of claim 1, further comprising at least one mechanical fastener mounting the base plate to the mounting plate.
9. The rotor blade assembly of claim 1, wherein the mounting plate includes one of a male fastening device or a female fastening device, wherein the base plate includes the other of the male fastening device or the female fastening device, and wherein the male fastening device and female fastening device are configured to couple the base plate and the mounting plate together.
10. The rotor blade assembly of claim 1, wherein the plurality of noise reduction features are a plurality of serrations.
11. A rotor blade assembly for a wind turbine, comprising:
- a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the surfaces further defining a rotor blade interior;
- a lightning protection device disposed at least partially in the rotor blade interior;
- a mounting plate configured on a surface of the rotor blade and operatively connected to the lighting protection device; and,
- a noise reducer mounted to the mounting plate.
12. The rotor blade assembly of claim 11, wherein the mounting plate extends through a surface of the rotor blade.
13. The rotor blade assembly of claim 11, wherein the mounting plate and one of the pressure side and the suction side are co-infused.
14. The rotor blade assembly of claim 11, wherein the mounting plate is disposed between the pressure side and the suction side.
15. The rotor blade assembly of claim 11, wherein the mounting plate is configured on the trailing edge.
16. The rotor blade assembly of claim 11, further comprising at least one mechanical fastener mounting the noise reducer to the mounting plate.
17. The rotor blade assembly of claim 11, wherein the mounting plate includes one of a male fastening device or a female fastening device, wherein the noise reducer includes the other of the male fastening device or the female fastening device, and wherein the male fastening device and female fastening device are configured to couple the noise reducer and the mounting plate together.
18. The rotor blade assembly of claim 11, further comprising a conduction cable operatively connecting the mounting plate to the lightning protection device.
19. The rotor blade assembly of claim 11, wherein the noise reducer comprising a base plate and a plurality of noise reduction features, the base plate mounted to the mounting plate, the plurality of noise reduction features extending from the base plate.
20. The rotor blade assembly of claim 19, wherein the plurality of noise reduction features are a plurality of serrations.
Type: Application
Filed: Nov 30, 2010
Publication Date: Oct 17, 2013
Applicant: General Electric Company (Schenectady, NY)
Inventor: Lihua Liu (XuanZhou)
Application Number: 13/988,357
International Classification: F01D 25/00 (20060101);