CN215672537U

CN215672537U - Blade of wind driven generator and noise-reduction sawtooth tail edge accessory

Info

Publication number: CN215672537U
Application number: CN202121940881.7U
Authority: CN
Inventors: 余海洋; 汪仲夏; 徐浩然
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-01-28
Anticipated expiration: 2031-08-18

Abstract

The utility model relates to a noise-reduction sawtooth tail edge accessory of a wind driven generator blade, which comprises an adhesive section, a flap section and a sawtooth section, wherein two ends of the flap section are respectively connected with the adhesive section and the sawtooth section; and a plurality of sawtooth tail edge accessories are arranged on the tail edge of the blade. The utility model also relates to a wind driven generator blade, wherein the blade tail edge is provided with a plurality of sawtooth tail edge accessories, and the chord length of the blade is increased by the sawtooth tail edge accessories, so that the pneumatic performance of the blade is improved, the output power of a wind turbine generator set can be effectively provided, and the wind energy utilization efficiency of the blade is increased; and the sawtooth tail edge accessory can change the flow state of fluid from each incoming flow direction to the tail edge of the wind driven generator blade, and can effectively reduce the aerodynamic noise of the tail edge of the wind driven generator blade.

Description

Blade of wind driven generator and noise-reduction sawtooth tail edge accessory

Technical Field

The utility model relates to the technical field of wind power technology and noise reduction design of wind turbine blades, in particular to a wind driven generator blade and a noise reduction sawtooth tail edge accessory.

Background

In recent years, wind energy has been widely concerned by various countries as a large-scale commercial clean renewable energy source, and with the rapid development of wind power industry in China, the technology of wind turbine generators is mature day by day, and the installed capacity of fans is increased rapidly. The wind generating set is about to be fully installed in remote areas with abundant wind resources, so that large-scale wind fields in low wind speed areas are urgently built, the aerodynamic noise of the wind generating set is larger and larger along with the large-scale development of land wind generating sets, the wind generating set is closer to the living area of people, the normal living of local residents is influenced, and the noise problem of the wind generating set is paid attention by society and environmental protection mechanisms.

The existing research shows that the main noise source of the wind generating set is aerodynamic noise generated by the wind turbine blades in the rotating process, and the noise intensity of the aerodynamic noise can be approximately regarded as being in direct proportion to the quintic power of the incoming wind speed. The aerodynamic noise of the wind turbine blade is also influenced by various factors such as the rotating speed of the wind turbine blade, the shape of the wind turbine blade, the incoming flow direction of fluid and the like.

Currently, two most common ways for reducing aerodynamic noise of a blade in the industry are: the first is to reduce the aerodynamic noise of the blade by reducing the rotating speed of the wind generating set, but the output power of the wind generating set is reduced, so that the wind energy utilization coefficient of the wind generating set is also reduced. Secondly, noise reduction tail edge sawteeth are adhered to the tail edge of the blade, but the noise can be reduced only when the common tail edge sawteeth flow in a specific direction in the incoming wind direction and the tail edge sawteeth, and after the incoming wind direction changes, the noise reduction effect of the tail edge sawteeth can be reduced, the load of the wind generating set can be increased, and the wind generating set is damaged.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a noise-reduction sawtooth tail edge accessory of a wind driven generator blade, which comprises an adhesive section, a flap section and a sawtooth section, wherein two ends of the flap section are respectively connected with the adhesive section and the sawtooth section, and the flap section and the sawtooth section are both of solid structures; and a plurality of sawtooth tail edge accessories are arranged on the tail edge of the blade.

Preferably, the bonding segment comprises two bonding sheets which are oppositely arranged, wherein the two bonding sheets are respectively and fixedly connected with the first outer contour surface and the second outer contour surface of the tail edge of the blade.

Preferably, the length of the flap section of each sawtooth tail edge attachment is 1% -2% of the chord length of the blade where it is installed.

Preferably, the length of the sawtooth section near the tail edge of each sawtooth is 10% -15% of the chord length of the blade where the sawtooth section is installed.

Preferably, the lengths of the flap sections of the sawtooth tail edge attachments are sequentially decreased progressively along the direction from the blade root to the blade tip.

Preferably, the length of the sawtooth section of each sawtooth tail edge attachment is gradually reduced along the direction from the blade root to the blade tip.

Preferably, the sawtooth section is composed of two side-by-side triangular sawtooth connections.

Preferably, the serrated trailing edge attachment is made by injection molding or 3D printing.

The utility model also provides a wind driven generator blade provided with the sawtooth tail edge accessories, and a plurality of the sawtooth tail edge accessories are arranged in a blade tail edge interval which is 70-95% away from a blade root along the blade span direction.

Preferably, the flap section and the serrated section of each of the serrated trailing edge attachments mounted on the blade trailing edge extend in the chord direction of the blade; or in the extension direction of the outer contour surface of the blade trailing edge.

Preferably, a plurality of said serrated trailing edge attachments are spaced apart spanwise along said blade.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the utility model, the sawtooth tail edge accessories are adhered to the tail edge section of the blade of the wind driven generator, so that the chord length of the blade is increased, the aerodynamic performance of the blade is improved, the output power of the wind driven generator set can be effectively provided, and the wind energy utilization efficiency of the blade is increased;

2. the sawtooth tail edge accessory can change the flowing state of fluid from various incoming flow directions to the tail edge of the wind driven generator blade, and effectively reduce the pneumatic noise of the tail edge of the wind driven generator blade.

Drawings

FIG. 1 is a schematic view of a sawtooth trailing edge attachment of the present invention in a wind turbine blade installation position;

FIG. 2 is an assembled view of the serrated trailing edge attachment of the present invention at the trailing edge of the blade;

FIG. 3 is a schematic view of the overall structure of the serrated trailing edge attachment of the present invention;

FIG. 4 is a cross-sectional view of an embodiment of a serration trailing edge attachment mounted on the trailing edge of a blade;

FIG. 5 is a cross-sectional view of an embodiment type serration trailing edge attachment mounted on the blade trailing edge;

FIG. 6 is an enlarged view of a portion of the bonding segment of the serration attachment to the trailing edge of the blade according to the present invention, i.e., an enlarged view of the area A of the circle frame in FIG. 5.

Detailed Description

The noise reduction sawtooth tail edge accessory of the wind driven generator blade provided by the utility model is further explained in detail with reference to the attached drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

In order to effectively reduce the aerodynamic noise of the trailing edge of the wind driven generator blade, as shown in fig. 3, the noise-reducing sawtooth trailing edge accessory 10 for the wind driven generator blade provided by the utility model comprises an integrally formed bonding section 101, a flap section 102 and a sawtooth section 103, wherein the two ends of the flap section 102 are respectively connected with the bonding section 101 and the sawtooth section 103, and the flap section 102 and the sawtooth section 103 are both solid structures; a plurality of the sawtooth tail edge attachments 10 are mounted on the blade tail edge 1. Wherein the sawtooth section 103 is formed by connecting two triangular sawteeth side by side. The flap segment 102 and the sawtooth segment 103 with the solid structure can solve the problem of poor noise reduction effect caused by the change response of the existing noise reduction technology to the direction of the airflow at the tail edge of the blade, namely, the sawtooth tail edge attachment 10 with the solid structure can effectively reduce the airflow noise no matter which direction the airflow comes from.

As shown in fig. 3, the sawtooth tail edge attachment 10 is mounted on the blade tail edge through an adhesive segment 101, specifically, the adhesive segment 101 includes two adhesive sheets oppositely arranged, and an opening 101' between the two adhesive sheets is adapted to the outer contour of the blade tail edge 1. During installation, the two adhesive sheets are respectively and fixedly connected with the first outer contour surface 11 and the second outer contour surface 12 of the blade tail edge 1, and the first outer contour surface 11 and the second outer contour surface 12 are also called as a suction surface and a pressure surface. As shown in fig. 6, a structural adhesive 104 with a thickness of about 0.5mm is filled between each bonding sheet and the suction surface or the pressure surface of the blade tail edge 1 for bonding the bonding sheet on the blade tail edge 1, so that the sawtooth tail edge attachment 10 is installed on the blade tail edge 1; the thickness of the blade trailing edge 1 with the serration trailing edge attachment 10 mounted thereon is not significantly changed from the thickness of the original blade trailing edge, thereby not affecting the flow of the blade surface.

As the chord length of the blade at the position where the sawtooth tail edge attachment 10 is bonded is continuously reduced along the direction from the blade root 5 to the blade tip 6, the length of the sawtooth tail edge attachment 10 is correspondingly and gradually reduced along the direction from the blade root 5 to the blade tip 6. The length h1 of the flap section 102 of the sawtooth tail edge attachment 10 decreases in sequence along the direction from the blade root 5 to the blade tip 6, and the length h2 of the sawtooth section 103 also decreases in sequence along the direction from the blade root 5 to the blade tip 6. Specifically, the length h1 of the flap segment 102 is 1% -2% of the chord length of the blade at the installation position; the length h2 of the sawtooth section 103 is 10% -15% of the chord length of the blade where it is mounted.

The utility model also provides a wind driven generator blade, which is provided with the plurality of sawtooth tail edge accessories 10, wherein the sawtooth tail edge accessories 10 are arranged in a blade tail edge 1 interval which is 70-95% away from a blade root along the spanwise direction r of the blade, and the sawtooth tail edge accessories 10 are arranged at intervals along the spanwise direction r of the blade as shown in a position 2 in the figure 1.

As shown in fig. 4, the flap segment 102 and the sawtooth segment 103 of each sawtooth tail edge attachment 10 extend in the chord direction t of the blade; alternatively, as shown in fig. 5, it extends in the direction of extension of the outer contour surface of the blade trailing edge 1, i.e., in the direction of extension of the first outer contour surface 11 in fig. 5.

The solid structure sawtooth trailing edge attachment 10 of this embodiment can be produced through modes such as moulding plastics or 3D printing shaping, then bond on the blade trailing edge 1 regional section that corresponds in 5 departments 70% -95% intervals apart from the blade root of aerogenerator blade, or at the whole blade trailing edge regional section of aerogenerator blade (in 70% -100% intervals apart from the blade root), in order to reach the purpose that reduces the sensitive characteristic of blade surface roughness and reduce aerogenerator blade trailing edge noise, have actual spreading value, be worth promoting.

In conclusion, the sawtooth tail edge accessories are bonded along the tail edge section of the wind driven generator blade, so that the chord length of the blade is increased, the aerodynamic performance of the blade is improved, the output power of a wind turbine generator can be effectively provided, and the wind energy utilization efficiency of the blade is increased; the sawtooth tail edge accessory can change the flow state of fluid from each incoming flow direction to the tail edge of the wind driven generator blade, and the aerodynamic noise of the tail edge of the wind driven generator blade can be effectively reduced.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims.

Claims

1. The noise-reduction sawtooth tail edge accessory of the wind driven generator blade is characterized by comprising an integrally-formed bonding section, a flap section and a sawtooth section, wherein the two ends of the flap section are respectively connected with the bonding section and the sawtooth section, and the flap section and the sawtooth section are both of solid structures; and a plurality of sawtooth tail edge accessories are arranged on the tail edge of the blade.

2. The noise reducing serration trailing edge attachment for a wind turbine blade according to claim 1, wherein the adhesive segment comprises two adhesive sheets disposed oppositely,

the two bonding sheets are fixedly connected with the first outer contour surface and the second outer contour surface of the tail edge of the blade respectively.

3. The noise reducing sawtooth tail edge attachment of claim 1 wherein the flap section of each sawtooth tail edge attachment has a length that is 1-2% of the chord length of the blade on which it is mounted.

4. The noise reducing sawtooth tail edge attachment of claim 1 wherein the length of the sawtooth section of each sawtooth tail edge attachment is between 10% and 15% of the chord length of the blade where it is mounted.

5. The noise reducing serrated trailing edge attachment of a wind turbine blade as claimed in claim 1, wherein the flap segment length of each serrated trailing edge attachment decreases in sequence from the blade root to the blade tip.

6. The noise reducing sawtooth trailing edge attachment of claim 1 wherein the sawtooth length of each sawtooth trailing edge attachment decreases in a blade root to blade tip direction.

7. The wind turbine blade noise reducing serration trailing edge attachment of claim 1, wherein the serration segments are comprised of two side-by-side triangular serration connections.

8. The noise reducing serrated trailing edge attachment of a wind turbine blade as claimed in claim 1, wherein the serrated trailing edge attachment is made by injection molding or 3D printing.

9. A wind turbine blade having a plurality of the serration tail edge attachments according to any one of claims 1 to 8 mounted thereon, wherein the plurality of the serration tail edge attachments are mounted within a range of 70% to 95% of the blade root along a span of the blade.

10. The wind turbine blade as in claim 9, wherein the flap section and the serration section of each said serration trailing edge attachment mounted on the blade trailing edge extend in a chord direction of said blade; or in the extension direction of the outer contour surface of the blade trailing edge.

11. The wind turbine blade as in claim 9, wherein a plurality of said serrated trailing edge attachment are spaced apart in a spanwise direction along said blade.