Trailing edge attachment, method for manufacturing trailing edge attachment, wind turbine blade and wind turbine generator set

Abstract

The present invention provides a trailing edge accessory, a method for manufacturing the trailing edge accessory, a wind turbine blade and a wind turbine generator set. The trailing edge accessory comprises an unsaturated polyester resin composition and chopped fibers, wherein the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt% based on the total weight of the unsaturated polyester resin composition and the chopped fibers. The trailing edge accessory according to the present invention can solve the technical problems such as welding marks, adhesive swelling and mildew that often occur in the serrated trailing edge of plastic materials, improve the strength and fracture resistance of the trailing edge accessory material itself, and prolong the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a trailing edge accessory, a manufacturing method of the trailing edge accessory, a wind turbine blade and a wind power generator set. Background Art

[0002] When the wind turbine blades rotate, the airflow passing through the trailing edge will produce sound scattering, forming turbulent boundary layer trailing edge noise and blade structure vibration noise, which is the main source of wind turbine blade noise.

[0003] Bonding serrated attachments on the trailing edge of the blade can effectively reduce noise, especially the far-field aerodynamic noise in the medium and low frequency bands. In addition, the serrated attachment has little effect on the dynamic load of the airfoil wall and has little effect on the aerodynamic performance of the airfoil.

[0004] At present, the serrated trailing edge materials commonly used in wind farms are mostly ASA thermoplastic engineering plastics. ASA plastic serrated trailing edges are generally made by melting ASA resin at high temperature and then adopting injection molding process. Therefore, the number, position and injection temperature of the injection ports directly affect the appearance quality of the serrated trailing edge, and defects such as weld marks are prone to occur, which is also the main reason for cracks or even fractures in the serrated trailing edge.

[0005] In addition, when the serrated trailing edge of ASA plastic material is bonded to the trailing edge of the blade with acrylic structural adhesive, since both ASA resin and acrylic adhesive contain acrylic components, a certain degree of "like dissolves like" phenomenon will occur when the two are bonded. Since the thickness of the ASA serrated trailing edge is relatively thin, once it is squeezed by external force after it becomes soft (before solidification), local deformation (convexity or concave) will occur, thus causing bonding failure.

[0006] In addition, the serrated tail edge of ASA plastic material is prone to mold if it is stored and transported in a high humidity and unventilated environment for a long time, which will cause corrosion of the serrated tail edge material performance and reduce its service life. Summary of the invention

[0007] The object of the present invention is to provide a trailing edge accessory that can solve technical problems such as welding marks, adhesive swelling and mildew that often occur on a serrated trailing edge made of plastic, a method for manufacturing the trailing edge accessory, a wind turbine blade including the trailing edge accessory, and a wind turbine generator set including the wind turbine blade.

[0008] According to one aspect of the present invention, a trailing edge accessory of a wind turbine blade is provided, the trailing edge accessory comprising an unsaturated polyester resin composition and chopped fibers, wherein based on the total weight of the unsaturated polyester resin composition and the chopped fibers, the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt%.

[0009] Optionally, the chopped fibers have a fiber length of 10 mm to 50 mm.

[0010] Optionally, the unsaturated polyester resin composition comprises an unsaturated polyester resin, and the unsaturated polyester resin composition further comprises at least one of a thickener, an initiator, a crosslinking agent, a low shrinkage additive, a filler and a mold release agent. Based on 100 parts by weight of the unsaturated polyester resin, the content of the thickener is 2-5 parts by weight, the content of the initiator is 0.01-3 parts by weight, the content of the crosslinking agent is 30-50 parts by weight, the content of the low shrinkage additive is 4-6 parts by weight, the content of the filler is 5-15 parts by weight, and the content of the internal mold release agent is 1-3 parts by weight.

[0011] Optionally, the chopped fibers are at least one of glass fibers, asbestos fibers, hemp fibers and basalt fibers.

[0012] Optionally, the trailing edge attachment includes a plurality of noise reduction teeth, the intersecting surfaces between adjacent noise reduction teeth are arc-shaped surfaces, and the thickness of the noise reduction teeth gradually decreases from the axis of the noise reduction teeth to the side of the noise reduction teeth.

[0013] Optionally, the trailing edge accessory further comprises a connecting body, the plurality of noise reduction teeth are arranged at one end of the connecting body, and the bonding area of ​​the connecting body is a frosted surface and / or a surface with grooves.

[0014] According to another aspect of the present invention, a method for manufacturing a trailing edge attachment of a wind turbine blade is provided, the method comprising: mixing an unsaturated polyester resin composition and chopped fibers with each other to form a mixed slurry, wherein, based on the total weight of the unsaturated polyester resin composition and the chopped fibers, the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt%; placing the mixed slurry in a mold for the trailing edge attachment; placing the mold on a hot press for heating and pressurizing.

[0015] Optionally, the step of placing the mold on a hot press for heating and pressurizing includes: first, preheating the mold at a temperature of 80°C-100°C; then, raising the temperature to 120°C-155°C, the molding pressure to 15MPa-25MPa, and the insulation time to 2min-10min.

[0016] Optionally, the manufacturing method further comprises: after placing the mold on a hot press for heating and pressurizing, demoulding and removing the trailing edge accessory, grinding a bonding area of ​​a connecting body of the trailing edge accessory and / or forming a groove on the bonding surface.

[0017] According to another aspect of the present invention, there is provided a wind blade, the wind blade comprising the trailing edge attachment as described above, or the wind blade comprising the trailing edge attachment manufactured according to the method as described above.

[0018] According to yet another aspect of the present invention, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the wind turbine blade as described above.

[0019] The trailing edge accessory according to the present invention can form a chopped fiber reinforced unsaturated polyester resin fiberglass structure by including an unsaturated polyester resin composition and chopped fibers. Compared with the ASA thermoplastic engineering plastics in the prior art, it can solve the technical problems such as weld marks, adhesive swelling and mildew that often occur in the serrated trailing edge of plastic materials without increasing the cost, improve the strength and fracture resistance of the trailing edge accessory material itself, and extend the service life.

[0020] Furthermore, according to the present invention, the trailing edge attachment is manufactured by hot pressing, so even if the noise reduction tooth has a gradually varying thickness, the trailing edge attachment can be easily manufactured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a schematic diagram of a trailing edge attachment according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A cross-sectional view of the trailing edge attachment in FIG.

[0024] Figure 3 is a flow chart of a method for manufacturing a trailing edge attachment according to an embodiment of the present invention.

[0025] In the accompanying drawings: 10 is a trailing edge attachment, 11 is a connecting body, 11a is a bonding area, 12 is a noise reduction body, 13 is a step, and 14 is an intersecting surface. DETAILED DESCRIPTION

[0026] Below, we will refer to Figures 1 to 3 A trailing edge attachment, a method for manufacturing the trailing edge attachment, a wind turbine blade, and a wind turbine generator set according to embodiments of the present invention are described.

[0027] Figure 1 is a schematic diagram of a trailing edge attachment according to an embodiment of the present invention, Figure 2 yes Figure 1 First, refer to the cross-sectional view of the trailing edge attachment in Figure 1 and Figure 2 The structure of the trailing edge attachment according to the embodiment of the present invention is described.

[0028] like Figure 1 As shown, the trailing edge attachment 10 according to an embodiment of the present invention may include a connection body 11. The connection body 11 has a bonding area 11a for bonding with the trailing edge of the blade. A step 13 is provided at one end of the bonding area 11a close to the noise reduction tooth 12, and the step 13 protrudes relative to the bonding area 11a. The connection body 11 may be a region that is combined (e.g., bonded) and overlapped with the trailing edge region of the blade.

[0029] According to an embodiment of the present invention, the bonding area 11a may be a curved surface to fit well with the trailing edge area of ​​the blade. As an example, the bonding area 11a may be a frosted surface and / or a surface with grooves (e.g., a checkerboard surface) to increase the bonding area (e.g., bonding area) to provide a stronger bonding strength.

[0030] According to an embodiment of the present invention, the step 13 can be used to fit with the trailing edge step of the blade, so that the airfoil of the fan blade can still be maintained after the trailing edge attachment is installed.

[0031] According to an embodiment of the present invention, the trailing edge attachment 10 may include a plurality of noise reduction teeth 12. Figure 1 As shown, the intersecting surface 14 between adjacent noise reduction teeth 12 (in the present invention, the intersecting surface is the axis connection surface of adjacent noise reduction teeth 12) is an arc surface. By setting it in this way, stress concentration can be avoided while ensuring the structural strength of the noise reduction tooth 12. In addition, the thickness of the entire noise reduction tooth 12 can be reduced as much as possible, and the resistance and additional noise caused by the trailing edge attachment 10 can be reduced.

[0032] According to an embodiment of the present invention, the thickness of the noise reduction tooth 12 gradually decreases from the axis of the noise reduction tooth 12 to the side of the noise reduction tooth 12. Through the above structure, the thickness of the entire noise reduction tooth 12 can be reduced as much as possible while ensuring the rigidity, thereby reducing the resistance and additional noise caused by the blade noise reduction device.

[0033] The following will describe the material of the trailing edge attachment according to the embodiment of the present invention. It should be understood that the material of the trailing edge attachment described below can be applied to the trailing edge attachment having the above structure, and can also be applied to trailing edge attachments of other structures commonly used in the art.

[0034] According to an embodiment of the present invention, the trailing edge accessory may include an unsaturated polyester resin composition and chopped fibers. The trailing edge accessory according to the present invention may include an unsaturated polyester resin composition and chopped fibers to form a chopped fiber reinforced unsaturated polyester resin glass fiber reinforced plastic structure. Compared with the ASA thermoplastic engineering plastics in the prior art, the technical problems such as welding marks, adhesive swelling and mildew that often occur in the serrated trailing edge of plastic materials can be solved without increasing the cost, thereby improving the strength and fracture resistance of the trailing edge accessory material itself and extending the service life.

[0035] According to an embodiment of the present invention, in order to balance the tensile strength, impact strength and bending strength of the trailing edge attachment, the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt% based on the total weight of the unsaturated polyester resin composition and the chopped fibers. When the content of the chopped fibers is less than 20wt%, the tensile strength and impact strength of the trailing edge attachment may be insufficient, and when the content of the chopped fibers is higher than 50wt%, the content of the unsaturated polyester resin composition is too small, resulting in insufficient bending strength of the trailing edge attachment.

[0036] As an example, the content of the unsaturated polyester resin composition is 60wt%-70wt%, and the content of the chopped fibers is 30wt%-40wt%. As another example, the content of the unsaturated polyester resin composition is 65wt%-70wt%, and the content of the chopped fibers is 30wt%-35wt%.

[0037] According to an embodiment of the present invention, the fiber length of the chopped fibers may be 10 mm to 50 mm, so that the chopped fibers can be uniformly dispersed in the resin paste of the unsaturated polyester resin composition when manufacturing the trailing edge attachment.

[0038] As an example, the fiber length of the chopped fibers may be 20 mm to 40 mm, or may be 30 mm to 40 mm.

[0039] According to an embodiment of the present invention, the chopped fibers may be at least one of glass fibers, asbestos fibers, hemp fibers and basalt fibers.

[0040] According to an embodiment of the present invention, the unsaturated polyester resin composition may include an unsaturated polyester resin, and may further include at least one of a thickener, an initiator, a cross-linking agent, a low shrinkage additive, a filler, and a release agent.

[0041] According to an embodiment of the present invention, based on 100 parts by weight of unsaturated polyester resin, the content of thickener is 2-5 parts by weight, the content of initiator is 0.01-3 parts by weight, the content of cross-linking agent is 30-50 parts by weight, the content of low shrinkage additive is 4-6 parts by weight, the content of filler is 5-15 parts by weight, and the content of internal release agent is 1-3 parts by weight.

[0042] As an example, the thickener may be a combination of magnesium oxide and magnesium hydroxide or a combination of calcium oxide and calcium hydroxide. As an example, the initiator may be an organic peroxide initiator, a dialkyl peroxide initiator or a composite initiator. As an example, the crosslinking agent may be at least one of styrene, methyl methacrylate, and dipropylene phthalate, and as an example, the low shrinkage additive may be one of polyvinyl chloride, polystyrene, polyethylene, and vinyl chloride-vinyl acetate copolymer. As an example, the filler may be calcium carbonate plus porcelain clay, or asbestos plus talc. As an example, the internal release agent may be at least one of stearic acid, zinc stearate, calcium stearate, magnesium stearate, oleic acid, and paraffin.

[0043] Figure 3 FIG. 1 is a flow chart of a method for manufacturing a trailing edge attachment according to an embodiment of the present invention. Figure 3 A method for manufacturing a trailing edge attachment according to an embodiment of the present invention is described. In order to avoid redundancy, descriptions repeated with the above description will be omitted.

[0044] like Figure 3 As shown, the manufacturing method of the trailing edge attachment according to an embodiment of the present invention may include: mixing an unsaturated polyester resin composition and chopped fibers with each other to form a mixed slurry (S1); placing the mixed slurry in a mold for the trailing edge attachment (S2); placing the mold on a hot press for heating and pressurizing (S3).

[0045] In step S1, a resin paste of an unsaturated polyester resin composition may be first formed. Based on the total weight of the unsaturated polyester resin composition and the chopped fibers, the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt%. The unsaturated polyester resin composition may include an unsaturated polyester resin, and may also include at least one of a thickener, an initiator, a crosslinking agent, a low shrinkage additive, a filler, and a release agent. The types and contents of the thickener, initiator, crosslinking agent, low shrinkage additive, filler, and release agent have been described above, and their detailed description will be omitted here.

[0046] In step S1, the above raw materials may be mixed together, and then stirred and degassed to form a uniform resin paste. As an example, the viscosity of the resin paste may be 10-50 Pa.s. After the resin paste is formed, chopped fibers may be added for full impregnation and stirring to form a mixed slurry. Optionally, the fiber length of the chopped fibers may be 10 mm-50 mm.

[0047] In step S2, the mixed slurry is placed in a mold for the trailing edge accessory. The shape of the mold can be designed according to the shape of the trailing edge accessory. An external mold release agent (e.g., silicone ester, silicone oil, etc.) can be pre-coated on the inner surface of the mold, and then the mixed slurry is placed in the mold. As an example, the loading amount is equal to the design weight of the trailing edge accessory plus 3-5% of the design weight, and then the mold is closed.

[0048] Reference above Figure 1 and Figure 2 The shape of the trailing edge attachment according to one embodiment of the present invention is described. Figure 1 and Figure 2 When describing the shape, since the thickness of the noise reduction teeth 12 is gradually changed and the intersecting surfaces 14 between adjacent noise reduction teeth 12 are arc-shaped surfaces, it cannot be formed by cutting in the prior art, but is formed by hot pressing according to an embodiment of the present invention.

[0049] In step S3, the mold is placed on a hot press for heating and pressurization. As an example, the mold can be placed on a multi-layer press of more than 100 tons.

[0050] First, the mold can be preheated at 80℃-100℃ to ensure the preheating effect. The mold can also be pre-compacted to drive out bubbles in the mixed slurry.

[0051] Then, the temperature can be raised to 120°C-155°C, the molding pressure can be 15MPa-25MPa, and the heat preservation time can be 2min-10min, so that the unsaturated polyester resin composition can be completely cured and molded.

[0052] As the hot pressing temperature increases, the temperature gradient between the surface and the core of the slab increases, the heat conduction speeds up, the core temperature rises rapidly, and the unsaturated resin composition can flow well and evenly distribute between the chopped fibers, thereby being fully cured. In addition, the increase in temperature enhances the degradation of the chemical components of the fibers, thereby increasing the activity of the fibers and facilitating the bonding between the fibers. However, when the temperature is too high, it may cause the degradation and embrittlement of the unsaturated resin and affect the bonding performance. In addition, the molding pressure will affect the density of the trailing edge attachment.

[0053] According to an embodiment of the present invention, by controlling the heating temperature at 120°C-155°C, the molding pressure at 15MPa-25MPa, and the insulation time at 2min-10min, the trailing edge attachment can be fully solidified and defects such as bubbling in the trailing edge attachment can be minimized.

[0054] According to an embodiment of the present invention, after the trailing edge attachment is removed, the surface of the trailing edge attachment may be lightly polished to remove the mold release agent remaining on the surface, and then wiped with a solvent such as acetone. Then, polyurethane primer and topcoat commonly used for blades are sprayed on the upper and lower surfaces of the trailing edge attachment (except for the bonding area).

[0055] Afterwards, the bonding surface (bonding area 11a) of the connection body of the trailing edge attachment can be lightly polished with sandpaper (eg, 100-grit sandpaper). Optionally, in order to improve the bonding force between the trailing edge attachment and the trailing edge of the blade, a groove can also be formed on the bonding surface.

[0056] In addition, the trailing edge area of ​​the blade where the trailing edge attachment is to be bonded can be lightly polished and repeatedly wiped clean with acetone or alcohol. Then, a layer of room temperature curing acrylic glue can be evenly applied on the bonding surface of the trailing edge attachment and the bonding surface of the trailing edge of the blade. The trailing edge attachment is placed on the bonding area of ​​the trailing edge of the blade and pressed hard to squeeze out excess bubbles and glue. The squeezed acrylic glue can be cleaned with a scraper.

[0057] Invention Example

[0058] The raw materials are weighed according to the following ratio and mixed uniformly to prepare a resin paste of an unsaturated polyester resin composition: 100 parts by weight of unsaturated polyester resin, 3 parts by weight of calcium oxide and calcium hydroxide, 35 parts by weight of styrene, 5 parts by weight of polyvinyl chloride, 1.5 parts by weight of stearate, and 12 parts by weight of calcium carbonate plus china clay.

[0059] According to the mass fraction ratio of resin paste to chopped glass fiber of 70:30, add chopped glass fiber with a fiber diameter of 30mm-35mm, and stir and mix evenly so that the resin completely impregnates the glass fiber.

[0060] Coat the inner cavity of the mold with a layer of silicone oil release agent, then fill the serrated mold with the mixed resin paste containing chopped fibers, and finally close the mold. Preheat the mold at 80℃-100℃, and then pre-compact to drive out bubbles. Then raise the temperature to 140℃-155℃, the molding pressure to 20MPa-25MPa, and the insulation time to 3min-5min. When the temperature drops below 60℃, remove the trailing edge accessories.

[0061] The surface of the trailing edge attachment is cleaned, lightly polished with sandpaper, wiped with acetone solvent, and then sprayed with polyurethane primer and topcoat to make the trailing edge attachment.

[0062] The present invention also conducted performance tests on the short fiber reinforced unsaturated polyester resin glass fiber reinforced plastic strips made of the above ingredients, and the measured properties are as follows: tensile strength is 124.9 MPa, tensile modulus is 13.1 GPa, flexural strength is 276.5 MPa, flexural modulus is 17.0 GPa, adhesion test strength (primer or topcoat set on the strip by tape pulling) is 6.2 MPa, impact strength is 36.9 KJ / m 2 When the performance test of ASA thermoplastic engineering plastic (ASAPW-978B) produced by Chi Mei in Taiwan, China was carried out, the tensile strength was 47.6MPa, the tensile modulus was 2.4GPa, the flexural strength was 88.6MPa, the flexural modulus was 2.8GPa, the adhesion test strength was 3.7MPa, and the impact strength was 16.9KJ / m 2 It can be seen that the performance of chopped fiber reinforced unsaturated polyester resin FRP is significantly higher than that of ASA thermoplastic engineering plastics.

[0063] According to one embodiment of the present invention, there may also be provided a wind blade comprising the above trailing edge attachment or a wind blade comprising the trailing edge attachment manufactured according to the above method.

[0064] According to another embodiment of the present invention, a wind turbine generator set including the above-mentioned wind turbine blade is further provided.

[0065] As described above, according to the present invention, the trailing edge accessory may include an unsaturated polyester resin composition and chopped fibers. The trailing edge accessory according to the present invention may include an unsaturated polyester resin composition and chopped fibers to form a chopped fiber reinforced unsaturated polyester resin glass fiber reinforced plastic structure, which can solve the technical problems of welding marks, adhesive swelling and mildew that often occur in the serrated trailing edge of plastic materials without increasing the cost, thereby improving the strength and fracture resistance of the trailing edge accessory material itself and extending the service life.

[0066] In addition, according to the present invention, since the thickness of the noise reduction teeth is gradually changed and the intersecting surface between adjacent noise reduction teeth is an arc surface, it cannot be formed by cutting in the prior art. According to the present invention, the trailing edge attachment is manufactured by hot pressing, so even if the noise reduction teeth have the above structure, the trailing edge attachment can be easily manufactured.

[0067] While exemplary embodiments of the present invention have been described in detail with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A trailing edge attachment for a fan blade, characterized in that: The trailing edge accessory comprises an unsaturated polyester resin composition and chopped fibers, wherein the unsaturated polyester resin composition and the chopped fibers are mixed with each other to form a mixed slurry and then cured and formed, and based on the total weight of the unsaturated polyester resin composition and the chopped fibers, the content of the unsaturated polyester resin composition is 50wt%-80wt%, and the content of the chopped fibers is 20wt%-50wt%; The trailing edge attachment (10) comprises a plurality of noise reduction teeth (12), the intersecting surfaces (14) between adjacent noise reduction teeth (12) are arc-shaped surfaces, and the thickness of the noise reduction teeth (12) gradually decreases from the axis of the noise reduction teeth (12) to the side of the noise reduction teeth (12).

2. The trailing edge attachment according to claim 1, characterized in that: The fiber length of the chopped fibers is 10 mm to 50 mm.

3. The trailing edge attachment according to claim 1, characterized in that: The unsaturated polyester resin composition comprises an unsaturated polyester resin, and the unsaturated polyester resin composition further comprises at least one of a thickener, an initiator, a crosslinking agent, a low shrinkage additive, a filler and a release agent, Wherein, based on 100 parts by weight of the unsaturated polyester resin, the content of the thickener is 2-5 parts by weight, the content of the initiator is 0.01-3 parts by weight, the content of the cross-linking agent is 30-50 parts by weight, the content of the low shrinkage additive is 4-6 parts by weight, the content of the filler is 5-15 parts by weight, and the content of the release agent is 1-3 parts by weight.

4. The trailing edge attachment according to claim 1, characterized in that: The chopped fibers are at least one of glass fibers, asbestos fibers, hemp fibers and basalt fibers.

5. The trailing edge attachment according to claim 1, characterized in that: The trailing edge attachment (10) further comprises a connecting body (11), the plurality of noise reduction teeth (12) are arranged at one end of the connecting body (11), and the bonding area (11a) of the connecting body (11) is a frosted surface and / or a surface with grooves distributed thereon.

6. A method for manufacturing a trailing edge attachment of a wind turbine blade, used for manufacturing the trailing edge attachment according to any one of claims 1 to 5, characterized in that: The manufacturing method comprises: mixing the unsaturated polyester resin composition and the chopped fibers with each other to form a mixed slurry; placing the mixed slurry in a mold for the trailing edge attachment; The mold is placed on a heat press to apply heat and pressure.

7. The manufacturing method according to claim 6, characterized in that: The step of placing the mold on a hot press for heating and pressurizing comprises: First, the mold is preheated at a temperature of 80°C-100°C; Then, the temperature is raised to 120°C-155°C, the molding pressure is 15MPa-25MPa, and the insulation time is 2min-10min.

8. The manufacturing method according to claim 6, characterized in that: The manufacturing method further comprises: After placing the mold on a hot press for heating and pressurizing, the trailing edge attachment is demoulded and taken out, and the bonding area of ​​the connection body of the trailing edge attachment is polished and / or a groove is formed on the bonding area of ​​the connection body of the trailing edge attachment.

9. A fan blade, characterized in that: The wind blade comprises the trailing edge attachment according to any one of claims 1 to 5, or the wind blade comprises the trailing edge attachment manufactured according to any one of claims 6 to 8.

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises the wind turbine blade according to claim 9.

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