CN108626069B - a wind turbine blade - Google Patents

Abstract

The invention provides a wind power blade which is characterized by comprising a wing-shaped pressure surface and a wing-shaped suction surface which are oppositely arranged, wherein the wing-shaped pressure surface and the wing-shaped suction surface are correspondingly connected to form a front edge and a blunt tail edge, a turbulence assembly for improving the aerodynamic performance of the blade is arranged on the blunt tail edge, the turbulence assembly comprises a pressure plate and a suction plate which are oppositely arranged, one end of the pressure plate is arranged on the wing-shaped pressure surface, and one end of the suction plate is arranged on the wing-shaped suction surface. The invention has the advantages of improving the working reliability of the turbulent flow component, having strong universality and the like.

Description

a wind turbine blade

technical field

The invention relates to the field of fan blades, in particular to a wind power blade.

Background technique

At present, in order to improve the aerodynamic performance of wind turbine blades, the existing wind turbine blades are usually equipped with vortex generators on the surface of the blades, which have a large load and are easy to cause damage under extreme working conditions. The surface shape is set accordingly. The installation position and size of the vortex generator have a great influence on the airflow around the blade. Therefore, it is necessary to ensure that the position, size and shape of the vortex generator are accurate, which is costly and easily affects the aerodynamic performance.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a wind power blade that improves the working reliability of the spoiler assembly and has strong versatility.

In order to solve the above-mentioned technical problems, the technical scheme proposed by the present invention is:

A wind power blade is characterized in that it includes an airfoil pressure surface and an airfoil suction surface arranged oppositely, and the airfoil pressure surface and the two ends of the airfoil suction surface are correspondingly connected to form a leading edge and a blunt trailing edge, and the blunt trailing edge is formed. The trailing edge is provided with a spoiler assembly for improving the aerodynamic performance of the blade, the spoiler assembly includes a pressure plate and a suction plate arranged oppositely, one end of the pressure plate is installed on the airfoil pressure surface, and the suction plate One end is installed on the suction surface of the airfoil.

As a further improvement of the above technical solution:

The spoiler assemblies are in multiple groups, and the multiple groups of the spoiler assemblies are arranged in sequence along the length direction of the blade.

Along the length direction of the blade, a plurality of groups of the spoiler components are arranged in the middle section of the blunt trailing edge.

The spoiler assembly further includes an enveloping part, the enveloping part is arranged on the other end of the pressure plate and the suction plate, and two ends of the enveloping part are respectively mounted on the outer surfaces of the pressure plate and the suction plate.

The enveloping part is connected with the pressure plate and the suction plate through an adhesive; the pressure plate and the suction plate are mounted on the blunt trailing edge through an adhesive, and the thickness of the adhesive is 0.5-5 mm.

The thickness of the pressure plate and the suction plate is 2-5m.

Both the pressure plate and the suction plate include a bonding portion mounted on the blunt trailing edge and an extension portion extending out of the blunt trailing edge, and the included angle θ between the bonding portion and the extending portion is 0-90°.

The extension length L1 of the extension part is 0.5%-10% of the chord length L2 of the blunt trailing edge airfoil section; the bonding length of the bonding part is 50-80 mm.

The end of the spoiler component connected to the blunt trailing edge is provided with a glass fiber cloth that enhances the connection strength of the spoiler component, and the glass fiber cloth is fixedly connected by structural adhesive.

The material of the spoiler component is the same as the material of the airfoil pressure surface and the airfoil suction surface.

Compared with the prior art, the advantages of the present invention are:

The spoiler assembly of the present invention is arranged at the position of the blunt trailing edge, which avoids the problem that the spoiler is arranged on the surface of the blade to affect the airflow, reduces the damage and damage of the spoiler assembly under extreme working conditions, and effectively improves the spoiler assembly. and the spoiler components have little effect on the overall load of the blade, so there is no need to strengthen the wind turbine; at the same time, the spoiler components include pressure plates and suction plates installed on the pressure surface of the airfoil and the suction surface of the airfoil , The structure is simple and the installation is convenient. Since the pressure plate and the suction plate are installed on the pressure surface and the suction surface at one end, they do not need to be replaced according to the curved shape of the blade surface, and the structure is versatile and can be applied to many types of blades. The spoiler assembly of the present invention further includes an enveloping member, which is arranged at one end of the pressure plate and the suction plate, and is wrapped around the outer surfaces of the pressure plate and the suction plate, which effectively strengthens the structural stability of the spoiler assembly, further It avoids the damage to the spoiler components caused by external factors under extreme working conditions.

Description of drawings

Hereinafter, the invention will be described in more detail on the basis of examples and with reference to the accompanying drawings. in:

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of the spoiler assembly of the present invention.

3 is a schematic structural diagram of a blunt trailing edge airfoil of a wind turbine blade according to the present invention.

FIG. 4 is a schematic diagram of the installation of the spoiler assembly and the blunt trailing edge according to Embodiment 1 of the present invention.

FIG. 5 is a schematic view of the installation of the spoiler assembly and the blunt trailing edge according to Embodiment 2 of the present invention.

The symbols in the figure represent:

1. Wind turbine blade; 11. Airfoil pressure surface; 12. Airfoil suction surface; 13. Leading edge; 14. Blunt trailing edge; 15. Blade root; 16. Blade tip; 2. Spoiler assembly; 21. Pressure plate ; 22, suction plate; 23, enveloping part; 24, bonding part; 25, extension part; 3, adhesive; 4, glass fiber cloth; 5, structural adhesive.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

Example 1

1 to 4 show embodiments of the wind power blade of the present invention. The wind power blade 1 includes an airfoil pressure surface 11 and an airfoil suction surface 12. The airfoil pressure surface 11 and the airfoil suction surface 12 are arranged oppositely, and the airfoil pressure surface 11 and the airfoil suction surface 12 are relatively arranged. The surface 11 is correspondingly connected with one end of the airfoil suction surface 12 to form a leading edge 13, and the airfoil pressure surface 11 is correspondingly connected with the other end of the airfoil suction surface 12 to form a blunt trailing edge 14. When the wind turbine blade 1 rotates, the leading edge 13 leads , the blunt trailing edge 14 follows, and the airflow from the airfoil pressure surface 11 and the airflow from the airfoil suction surface 12 meet at the blunt trailing edge 14 . In this embodiment, a spoiler assembly 2 is provided on the blunt trailing edge 14, and the spoiler assembly 2 is used to improve the aerodynamic performance of the blade. The spoiler assembly 2 includes a pressure plate 21 and a suction plate 22 arranged oppositely. One end of the pressure plate 21 Installed on the airfoil pressure surface 11 , one end of the suction plate 22 is installed on the airfoil suction surface 12 . The spoiler assembly 2 of the present invention is arranged at the position of the blunt trailing edge 14, which avoids the problem that the spoiler is arranged on the blade surface to affect the airflow, reduces the damage and damage of the spoiler assembly 2 under extreme working conditions, and effectively improves the The working reliability of the spoiler assembly 2, and the impact of the spoiler assembly 2 on the overall load of the blade is small, and there is no need to strengthen the wind turbine; at the same time, the spoiler assembly 2 includes relatively installed on the airfoil pressure surface 11 and the airfoil suction surface. The pressure plate 21 and the suction plate 22 on the 12 have simple structure and easy installation. Since the pressure plate 21 and the suction plate 22 are installed on the pressure surface and the suction surface at one end, they do not need to be replaced according to the curved shape of the blade surface, and the structure is highly versatile. , applicable to many types of blades.

In this embodiment, the spoiler assemblies 2 are in multiple groups, and the multiple groups of spoiler assemblies 2 are arranged in sequence along the direction from the blade root 15 to the blade tip 16 (that is, the length direction of the wind turbine blade 1 ), and the multiple groups of spoiler assemblies are arranged in sections. 2. It is convenient for the accurate installation and positioning of the spoiler assembly 2 on the blunt trailing edge 14, which effectively improves the installation and subsequent maintenance efficiency of the spoiler assembly 2; The middle section of the edge 14.

In this embodiment, the pressure plate 21 is bonded to the airfoil pressure surface 11 by the adhesive 3, and the suction plate 22 is bonded to the airfoil suction surface 12 by the adhesive 3, and the thickness of the adhesive 3 is 3 mm , In other embodiments, in order to ensure the bonding strength of the spoiler assembly 2, there are strict requirements on the thickness of the adhesive 3, and the thickness of the adhesive 3 can be selected from 0.5-5 mm.

In this embodiment, the thicknesses of the pressure plate 21 and the suction plate 22 are controlled at 2-5 m, so as to reduce the influence of the thickness of the spoiler assembly 2 on the aerodynamic performance of the blade. In this embodiment, both the pressure plate 21 and the suction plate 22 include a bonding portion 24 and an extension portion 25 . The bonding portion 24 is used to connect with the airfoil pressure surface 11 and the airfoil suction surface 12 of the wind turbine blade 1 . This embodiment In order to ensure the bonding strength, the bonding length of the bonding portion 24 is 50-80 mm, which can prevent the pressure plate 21 and the suction plate 22 from shaking due to turbulence in the airflow; the extension portion 25 extends out of the blunt trailing edge 14, extending The portion 25 is used to ensure the aerodynamic performance of the blade.

As shown in FIG. 3 and FIG. 4 , in this embodiment, the extension length L ₁ of the extension part 25 is 0.5% to 10% of the chord length L ₂ of the blunt trailing edge airfoil section, so that the extension part 25 can meet the requirements of the wind turbine blade 1 . The size is adjusted in time to ensure the aerodynamic performance of the blade. In this embodiment, the angle θ between the adhesive part 24 and the extension part 25 is 30°. In other embodiments, the angle θ between the adhesive part 24 and the extension part 25 can be selected from 0° to 90°, so as to ensure the spoiler assembly 2 performance.

In this embodiment, glass fiber cloth 4 is provided at the end of the spoiler assembly 2 connected to the blunt tail edge 14 , and the two ends of the glass fiber cloth 4 are respectively connected to the outer surface of the bonding portion 24 and the outer surface of the blunt tail edge 14 . The fiber cloth 4 is used to enhance the connection strength of the spoiler assembly 2 and ensure the working reliability of the spoiler assembly 2 , and the glass fiber cloth 4 is fixed by the structural adhesive 5 . In this embodiment, the material of the spoiler assembly 2 is the same as the material of the airfoil pressure surface 11 and the airfoil suction surface 12 , so that the lightning protection system of the wind turbine blade 1 does not need to be improved.

In this embodiment, the installation method of the spoiler assembly 2 includes the following steps: (1) cleaning the surface of the blunt trailing edge 14 without paint, putty and other substances on the surface; (2) on the blunt tail of the airfoil pressure surface 11 Apply adhesive 3 to the bonding area of the edge 14 and the pressure plate 21, and install the pressure plates 21 of each group of spoiler components 2 in sequence along the length of the blade according to the installation position; Apply the adhesive 3 on the junction area and the suction plate 22, and install the suction plates 22 of each group of spoiler assemblies 2 in sequence along the length of the blade according to the installation position; (3) After the adhesive 3 is completely cured, press The ends of the plate 21 and the suction plate 22 connecting the blunt trailing edge 14 are laid with glass fiber cloth 4 for local reinforcement, and connected by the structural adhesive 5. After the structural adhesive 5 is cured, the wind turbine blade 1 is repaired and painted. paint.

Example 2

FIG. 5 shows another embodiment of a wind turbine blade according to the present invention. This embodiment is basically the same as the previous embodiment, except that the spoiler assembly 2 in this embodiment further includes an enveloping part 23, and the enveloping part 23 is provided with At one end of the pressure plate 21 and the suction plate 22 away from the blunt trailing edge 14 , the two ends of the enveloping member 23 are respectively mounted on the outer surfaces of the pressure plate 21 and the suction plate 22 . The enveloping member 23 is wrapped around the outer surfaces of the pressure plate 21 and the suction plate 22 , which effectively strengthens the structural stability of the spoiler assembly 2 and further avoids damage to the spoiler assembly 2 by external factors under extreme working conditions.

In this embodiment, the enveloping member 23 is connected to the pressure plate 21 and the suction plate 22 through the adhesive 3, and the thickness of the adhesive 3 is 0.5-5 mm to ensure the bonding strength of the enveloping member 23; in this embodiment , the envelope part 23 is a C-shaped envelope part 23 .

In this embodiment, the installation method of the spoiler assembly 2 includes the following steps: (1) cleaning the surface of the blunt trailing edge 14 without paint, putty and other substances on the surface; (2) on the blunt tail of the airfoil pressure surface 11 Apply adhesive 3 to the bonding area of the edge 14 and the pressure plate 21, and install the pressure plates 21 of each group of spoiler components 2 in sequence along the length of the blade according to the installation position; Apply the adhesive 3 on the junction area and the suction plate 22, and install the suction plates 22 of each group of spoiler assemblies 2 in sequence along the length of the blade according to the installation position; (3) After the adhesive 3 is completely cured, install the pressure plate Apply adhesive 3 to the end of the suction plate 21 to connect the end of the pressure plate 21 to the envelope part 23; apply adhesive 3 to the end of the suction plate 22 to connect the end of the suction plate 22 to the envelope part 23 (4) Lay glass fiber cloth 4 at the end of the connection blunt trailing edge 14 of the pressure plate 21 and the suction plate 22 for local reinforcement, and connect through the structural adhesive 5, after the structural adhesive 5 is cured, the wind turbine blade 1 Retouch and apply paint.

While the present invention has been described with reference to the preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (8)

1. A wind turbine blade, which is characterized in that it comprises an airfoil pressure surface and an airfoil suction surface arranged oppositely, and the airfoil pressure surface and the two ends of the airfoil suction surface are correspondingly connected to form a leading edge and a blunt trailing edge, so The blunt trailing edge is provided with a spoiler assembly for improving the aerodynamic performance of the blade, the spoiler assembly includes a pressure plate and a suction plate arranged oppositely, one end of the pressure plate is installed on the airfoil pressure surface, and the suction One end of the plate is installed on the suction surface of the airfoil, Wherein, the spoiler assembly further includes an enveloping part, the enveloping part is arranged on the other end of the pressure plate and the suction plate, and the two ends of the enveloping part are respectively installed on the outside of the pressure plate and the suction plate surface, Both the pressure plate and the suction plate include a bonding portion mounted on the blunt trailing edge and an extension portion extending out of the blunt trailing edge, and the included angle θ between the bonding portion and the extending portion is 0-90°. 2 . The wind power blade according to claim 1 , wherein the spoiler components are in multiple groups, and the multiple groups of the spoiler components are arranged in sequence along the length direction of the blade. 3 . 3 . The wind power blade according to claim 2 , wherein, along the length direction of the blade, a plurality of groups of the spoiler components are arranged in the middle section of the blunt trailing edge. 4 . 4 . The wind power blade according to claim 1 , wherein the enveloping member is connected to the pressure plate and the suction plate through an adhesive; the pressure plate and the suction plate are mounted on the blunt tail through an adhesive. 5 . On the edge, the thickness of the adhesive is 0.5-5mm. 5 . The wind power blade according to claim 1 , wherein the thickness of the pressure plate and the suction plate is 2-5 m. 6 . 6 . The wind turbine blade according to claim 5 , wherein the extension length L ₁ of the extension portion is 0.5% to 10% of the chord length L ₂ of the blunt trailing edge airfoil section; the bonding portion The bonding length is 50-80mm. 7. The wind power blade according to any one of claims 1 to 3, wherein the end of the spoiler component connected to the blunt trailing edge is provided with a glass fiber cloth that enhances the connection strength of the spoiler component. The fiber cloth is fixedly connected by structural adhesive. 8 . The wind turbine blade according to claim 1 , wherein the material of the spoiler component is the same as the material of the airfoil pressure surface and the airfoil suction surface. 9 .

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