JP4180016B2 - Windmill blade manufacturing method, windmill blade and wind power generator - Google Patents

Description

  The present invention relates to a method of manufacturing a wind turbine blade used in a wind turbine generator, a wind turbine blade manufactured by the manufacturing method, and a wind turbine generator including the wind turbine blade, and in particular, almost eliminates airflow noise caused by rotation of a rotor. The present invention relates to a method of manufacturing a wind turbine blade that is not generated, a wind turbine blade manufactured by the manufacturing method, and a wind turbine generator provided with the wind turbine blade.

  Wind power generation has recently been promoted on a global scale in order to protect the earth from environmental destruction such as global warming and air pollution. Under such circumstances, noise caused by wind noise generated from wind turbine blades has become a problem as new noise pollution. In particular, in the field of small wind power generation, it is necessary to reduce the noise due to the fact that a wind power generation apparatus is often installed in a residential area in an urban area.

  Conventionally, as a method for reducing the noise level, a method for reducing the rotation speed of the propeller has been effective. For example, as the method, in designing the wind turbine blade, the peripheral speed ratio (ratio between the speed at which the tip of the rotating propeller advances and the wind speed flowing into the wind turbine generator) is designed to be small. . Specifically, in a small wind power generator, when high-efficiency power generation is targeted, the peripheral speed ratio of the wind turbine blade is “9” (the tip of the propeller is 12.5 m / sec × 9 at a wind speed of 12.5 m / sec). The wind turbine blade was designed so that the rotation speed was about 112 m / sec.

In the case of a wind turbine blade having a high peripheral speed ratio, a method using a control device that reduces the rotational speed of the wind turbine blade in accordance with the surrounding environment to be installed has been employed.
However, in order to generate power efficiently, it is necessary to increase the peripheral speed ratio, and this also increases the level of noise generated from the wind turbine blades.

That is, in order to reduce the noise as described above, the conventional wind power generator must reduce the peripheral speed ratio in advance at the expense of efficiency when designing the wind turbine blade, and at the expense of power generation efficiency. There was a problem that noise had to be suppressed.
In the case of a wind turbine blade having a high peripheral speed ratio, a control device that reduces the rotational speed of the wind turbine blade according to the surrounding environment to be installed must be used, and noise is generated at the expense of power generation efficiency. There was a problem that it had to be suppressed.

In order to solve these problems, a technique has been developed for reducing noise by providing an uneven portion for generating a vertical vortex in part or all of a wind turbine blade.
For example, a plurality of continuous filaments extending from the front edge to the rear edge of the wind turbine blade by rod-like filaments arranged at equal intervals on the surface of the wind turbine blade and an adhesive that adheres the filament to the surface of the wind turbine blade. There is a wind turbine blade in which streak-like riblets are provided on the surface of the wind turbine blade (see, for example, Patent Document 1).
JP-A-11-201021

However, the conventional wind turbine blade provided with riblets has an effect of reducing airflow noise generated by the rotation of the rotor, but has a problem that its manufacturing method is complicated.
The present invention has been made in view of the drawbacks of the prior art described above, and it is possible to manufacture a wind turbine blade that can easily manufacture a wind turbine blade that generates almost no airflow noise caused by the rotation of the rotor at low cost. It is an object to provide a method, a wind turbine blade manufactured by the manufacturing method, and a wind turbine generator provided with the wind turbine blade.

The present invention employs the following configuration in order to solve the above problems.
That is, according to one aspect of the present invention, the wind turbine blade manufacturing method of the present invention is characterized in that the wind turbine blade main body is entirely or partially covered with a gel-like viscoelastic material.
Further, in the method for manufacturing a wind turbine blade according to the present invention, the gel viscoelastic material is applied to the surface of the wind turbine blade body, sprayed, printed and transferred, or bonded, or immersed in the gel viscoelastic material. Therefore, it is desirable that the wind turbine blade body is covered with the gel-like viscoelastic substance.

  Further, in the method for manufacturing a wind turbine blade according to the present invention, the concave and convex portions are alternately short in the longitudinal direction of the wind turbine blade with respect to the surface of the gel viscoelastic material covering the wind turbine blade body. It is desirable that the riblet be formed so that the concave portion and the convex portion have a streak shape in the hand direction.

  Further, in the method for manufacturing a wind turbine blade according to the present invention, the riblet is formed so that the concave portion and the convex portion are alternately arranged in the longitudinal direction of the wind turbine blade, and the concave portion and the convex portion are striped in the short direction. Furthermore, it is desirable that the gel-like viscoelastic material is printed and transferred onto the surface of the windmill blade body so that the windmill blade is covered with the gel-like viscoelastic material in which the riblets are formed.

  According to another aspect of the present invention, there is provided a method for manufacturing a wind turbine blade according to the present invention, wherein the concave portion and the convex portion are alternately arranged in the longitudinal direction of the wind turbine blade body, and the concave portion and the convex portion are streaked in the short direction. A wind turbine blade main body is manufactured so as to form a ring-shaped portion, and the whole or a part of the wind turbine blade main body is covered with a gel-like viscoelastic material, whereby a concave portion and a convex portion are formed in the longitudinal direction of the wind turbine blade. The riblets are formed so that the concave portions and the convex portions are streaked alternately in the short direction.

  Further, in the method for manufacturing a wind turbine blade according to the present invention, the gel viscoelastic material is applied to the surface of the wind turbine blade body, sprayed, printed and transferred, or bonded, or immersed in the gel viscoelastic material. Therefore, it is desirable that the wind turbine blade body is covered with the gel-like viscoelastic substance.

Moreover, according to one aspect of the present invention, the wind turbine blade of the present invention is a wind turbine blade manufactured by the manufacturing method of these wind turbine blades.
According to another aspect of the present invention, a wind turbine generator according to the present invention includes the wind turbine blade described above.

  According to the present invention, by covering the whole or a part of the wind turbine blade main body with the gel-like viscoelastic material, it is possible to easily produce a wind turbine blade at a low cost that hardly generates airflow noise caused by the rotation of the rotor of the wind turbine. Can be manufactured.

Embodiments of the present invention will be described below with reference to the drawings.
First, a first embodiment of the present invention will be described with reference to FIGS.
(Cover with gel viscoelastic material)
FIG. 1 is a front view of the windmill, and FIG. 2 is a side view of the windmill.

1 and 2, the wind turbine 1 includes three wind turbine blades 2 and a rotation shaft to which each wind turbine blade 2 is attached. Such a windmill 1 is used, for example, in a small wind power generator, and generates electric energy by converting wind power into rotational force.
FIG. 3 is a front view of the wind turbine blade, and FIG. 4 is a side view of the wind turbine blade.

  The wind turbine blade 2 shown in FIG. 3 and FIG. 4 has an airfoil shape in cross section. For example, the length is about 600 mm, the width is about 15 mm to 150 mm, and the thickness is about 10 mm. In addition, the base end side (the side attached to the rotating shaft) of the wind turbine blade 2 has a large rising angle with respect to the wind flow, and gradually decreases toward the tip, and the rising angle with respect to the wind flow is minimized at the leading edge. ing.

FIG. 5 is a diagram for explaining the structure of the wind turbine blade according to the first embodiment.
FIG. 5 is an enlarged view of a part of the wind turbine blade 2 shown in FIG.
In FIG. 5, the wind turbine blade 2 is a part of the wind turbine blade main body 21 in the form of a gel such as a thermosetting resin, a thermoplastic resin, a pressure sensitive adhesive, an energy beam curable resin, or an energy beam curable adhesive. It is manufactured by covering with a viscoelastic material 22.

  More specifically, the gel-like viscoelastic substance 22 includes, for example, rubber-based viscoelastic substances such as natural rubber, synthetic rubber, and silicone rubber, thermosetting resins such as polyurethane-based resins, ethylene-vinyl acetate copolymers, A thermoplastic resin such as a copolymer resin made of an acrylate ester or a derivative thereof, a pressure-sensitive adhesive based on these rubbers or resins, and the like can be used. Also, pressure sensitive adhesives (for example, rubber-based pressure sensitive adhesives made of natural rubber, various synthetic rubbers, etc .; (meth) acrylic acid alkyl ester homopolymers or copolymers, the esters and the esters Acrylic pressure-sensitive adhesives composed of copolymers with other copolymerizable unsaturated monomers, silicone pressure-sensitive adhesives, etc., thermosetting resins (eg, epoxy resins, unsaturated esters) Resin, thermosetting acrylic resin, phenol resin, and the like) and thermoplastic resins (for example, saturated polyester resin, thermoplastic polyurethane resin, amide resin, imide resin, and the like).

The gel-like viscoelastic substance 22 may be a blend of at least two selected from a pressure sensitive adhesive, a thermosetting resin, and a thermoplastic resin. An appropriate additive such as an agent can also be added.
Next, as a second embodiment to a sixth embodiment, a specific method for covering the whole or a part of the wind turbine blade main body 21 with the gel-like viscoelastic substance 22 will be described.
Second Embodiment As a second embodiment to which the present invention is applied, the whole of the wind turbine blade main body 21 or a part centering on the surface of the wind turbine blade main body 21 is used. A viscosity of the gel-like viscoelastic material 22 such as a plastic resin, a pressure sensitive adhesive, an energy ray curable resin, or an energy ray curable pressure sensitive adhesive 22 is dispersed (for example, fluidized) in, for example, a solvent. Apply almost evenly with a brush. Then, by drying the solvent, the wind turbine blade 2 has a structure in which the wind turbine blade body 21 is covered with the gel-like viscoelastic material 22, in other words, the outside of the wind turbine blade body 21 is covered with the gel-like viscoelastic material 22. A double structure.
Third Embodiment As a third embodiment to which the present invention is applied, the whole of the wind turbine blade main body 21 or a part around the surface of the wind turbine blade main body 21 is provided with the above-described thermosetting resin, A viscosity of the gel-like viscoelastic material 22 such as a plastic resin, a pressure sensitive adhesive, an energy ray curable resin, or an energy ray curable pressure sensitive adhesive 22 is dispersed (for example, fluidized) in, for example, a solvent. Spray almost uniformly with a spray gun. Then, by drying the solvent, the wind turbine blade 2 has a structure in which the wind turbine blade main body 21 is covered with the gel-like viscoelastic material 22 as in the second embodiment.
Fourth Embodiment As a fourth embodiment to which the present invention is applied, the above-described thermosetting resin, heat, and the like are formed on the whole wind turbine blade body 21 or a part of the surface of the wind turbine blade body 21. The viscosity is lowered (made fluid) by dispersing a gel-like viscoelastic material 22 such as a plastic resin, a pressure sensitive adhesive, an energy ray curable resin, or an energy ray curable pressure sensitive adhesive in a solvent, for example, as an ink. Transfer by printing. Then, by drying the solvent, the wind turbine blade 2 has a structure in which the wind turbine blade main body 21 is covered with the gel viscoelastic material 22 as in the second or third embodiment. Since the gel-like viscoelastic material 22 can be printed and transferred in a highly viscous state compared to the application in the second embodiment or the spraying in the third embodiment, the subsequent drying process is performed in a short time. be able to.
Fifth Embodiment As a fifth embodiment to which the present invention is applied, first, the above-mentioned thermosetting resin, thermoplastic resin, pressure sensitive adhesive, energy beam curable resin or energy beam curable pressure sensitive adhesive. A gel-like viscoelastic material 22 such as a sheet or film is formed. As a method for forming a sheet or film, the gel viscoelastic material 22 formed in a plate shape may be stretched, or may be formed in the form of a sheet or film from the beginning. Then, the gel-like viscoelastic material 22 formed in the form of a sheet or film is adhered to the whole wind turbine blade main body 21 or a part centered on the surface of the wind turbine blade main body 21 using an adhesive or the like. Let it wrap. By doing in this way, the windmill blade 2 becomes a structure where the said windmill blade main body 21 is covered with the said gel-like viscoelastic substance 22 similarly to the above-mentioned 2nd thru | or 4th embodiment.
Sixth Embodiment As a sixth embodiment to which the present invention is applied, the above-described thermosetting resin, thermoplastic resin, pressure sensitive adhesive, energy beam curable resin, energy beam curable pressure sensitive adhesive, and the like are used. The gel viscoelastic material 22 is dispersed (for example, fluidized) by dispersing it in a solvent, for example, and the entire windmill blade body 21 or a part of the windmill blade body 21 centered on the surface is contained therein. Immerse for a predetermined time. Thereafter, by removing the wind turbine blade main body 21 and drying the solvent, the wind turbine blade 2 has a structure in which the wind turbine blade main body 21 is covered with the gel-like viscoelastic material 22, in other words, the outside of the wind turbine blade main body 21 is gel-like. A double structure covered with the viscoelastic material 22 is obtained.

  As described above, as the first to sixth embodiments, the airflow generated by the rotation of the rotor of the windmill 2 by covering the whole or part of the windmill blade body 21 with the gel-like viscoelastic material 22. A method of easily manufacturing a wind turbine blade that hardly generates noise at low cost is described.

Next, a method for manufacturing a wind turbine that further suppresses the generation of airflow noise will be described.
FIG. 6 is a view for explaining the structure of the wind turbine blade according to the seventh embodiment.
6 is an enlarged view of a part of the wind turbine blade, similar to FIG. 5 in which a part of the wind turbine blade 2 shown in FIG. 4 is enlarged.

In FIG. 6, the wind turbine blade 3 is a gel viscoelastic material by using the method of any one of the first to sixth embodiments described above to make the whole or part of the wind turbine blade main body 21 a gel-like viscoelastic substance. Cover with 23.
Then, for example, using a processing tool having nail-like protrusions arranged in a row at a predetermined interval, the protrusion is applied to the surface of the gel-like viscoelastic material 23, and the processing tool and the windmill 2 are moved relative to each other. By scratching the surface of the gel-like viscoelastic material 23, the concave portions 232 and the convex portions 231 are alternately arranged in the longitudinal direction of the wind turbine blade 3, and the concave portions 232 and the convex portions 231 are striped riblets in the short direction. 230 (see FIG. 7) is formed.

  In addition, although the recessed part 232 and the convex part 231 are shown so that a curve (curved surface) may be drawn in FIG. 6, depending on the shape of the protrusion with which a processing tool is equipped, or the viscosity of the gel-like viscoelastic substance 23, etc. Although the shapes are various, it is only necessary that the concave portions 232 and the convex portions 231 alternate in the longitudinal direction of the wind turbine blade 3 as a whole.

FIG. 7 is a view for explaining a wind turbine blade in which a riblet is formed.
In FIG. 7, as described above, the riblet 230 moves the processing tool and the windmill 2 relative to each other and scratches the surface of the gel-like viscoelastic material 23, thereby causing the concave portion 232 and the convex portion 231 in the longitudinal direction of the windmill blade 3. Are alternately formed, and a riblet 230 in which the concave portion 232 and the convex portion 231 are formed in a short direction is formed.

Next, an eighth embodiment to which the present invention is applied will be described.
As an eighth embodiment to which the present invention is applied, a gel-like viscoelastic material 23 such as the thermosetting resin described above is formed on the entire wind turbine blade body 21 or a part centered on the surface of the wind turbine blade body 21. Is dispersed in a solvent, for example, to reduce the viscosity (become fluidized) and to transfer by printing as ink. At this time, the gel-like viscoelastic material 23 transferred by printing is such that the concave portions 232 and the convex portions 231 alternate in the longitudinal direction of the wind turbine blade 3 and the concave portions 232 and the convex portions 231 are striped in the short direction. The riblet 230 is formed. Then, by drying the solvent, the wind turbine blade 2 has a structure in which the wind turbine blade main body 21 is covered with the gel-like viscoelastic material 22 in which the riblets 230 are formed.

Next, a ninth embodiment to which the present invention is applied will be described.
FIG. 8 is a diagram for explaining the structure of the wind turbine blade according to the ninth embodiment.
In FIG. 8, the wind turbine blade main body 24 is configured such that the concave portions 242 and the convex portions 241 are alternately arranged in the longitudinal direction of the wind turbine blade main body 24 so that the concave portions 242 and the convex portions 241 form streak-like portions in the short direction. For example, it manufactures using a metal mold | die. Then, in the same manner as in the first to sixth embodiments described above, that is, the gel-like viscoelastic material 25 is applied to the surface of the wind turbine blade body 24, sprayed, printed and transferred, or adhered. By immersing the windmill blade body 24 in the gel viscoelastic material 25, the windmill blade body 24 is entirely or partially covered with the gel viscoelastic material 25. By doing in this way, the concave part 252 and the convex part 251 are alternated in the longitudinal direction of the wind turbine blade 4, and the concave part 252 and the convex part 251 are striped in the short direction to form a riblet.

As described above, the first to ninth embodiments of the present invention have been described. The wind turbine blades 2, 3, and 4 manufactured according to these embodiments constitute the present invention.
Further, the wind turbine blades 2, 3, and 4 manufactured according to the embodiment of the present invention are used for a wind power generator that generates electric energy by converting wind power into a rotational force, preferably a small wind power generator. it can. That is, the wind power generator provided with the wind turbine blades 2, 3, and 4 manufactured according to these embodiments constitutes the present invention.

The embodiment of the present invention has been described above with reference to the drawings. However, the method for manufacturing a wind turbine blade to which the present invention is applied is limited to the above-described embodiment as long as the function is executed. In other words, various configurations can be adopted without departing from the scope of the present invention.
For example, the wind turbine blades 2, 3, and 4 manufactured according to the embodiment of the present invention can be used for blades (blades) such as a fan, an air cooling fan, and a screw.

It is a front view of a windmill. It is a side view of a windmill. It is a front view of a windmill blade. It is a side view of a windmill blade. It is a figure for demonstrating the structure of the windmill blade concerning 1st Embodiment. It is a figure for demonstrating the structure of the windmill blade concerning 7th Embodiment. It is a figure for demonstrating the windmill blade which formed the riblet. It is a figure for demonstrating the structure of the windmill blade concerning 9th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Windmill 2 Windmill blade 3 Windmill blade 21 Windmill blade main body 22 Gel-like viscoelastic substance 23 Gel-like viscoelastic substance 24 Windmill blade main body 25 Gel-like viscoelastic substance 230 Riblet 231 Convex part 232 Concave part 241 Convex part 242 Concave part 251 Convex part 252 Recess

Claims (4)

In the method of manufacturing a wind turbine blade,
The wind turbine blade body is manufactured such that the concave portion and the convex portion are alternately arranged in the longitudinal direction of the wind turbine blade main body, and the concave portion and the convex portion form a streak-like portion in the short direction,
By covering the whole or part of the wind turbine blade body with a gel-like viscoelastic material, the concave portion and the convex portion are alternately arranged in the longitudinal direction of the wind turbine blade, and the concave portion and the convex portion are striped in the short direction. A method of manufacturing a wind turbine blade, wherein riblets are formed so that By applying the gel-like viscoelastic substance to the surface of the windmill blade body, spraying, printing and transferring, or adhering or immersing the gel-like viscoelastic substance in the gel-like viscoelastic substance, The method for manufacturing a wind turbine blade according to claim 1 , wherein the wind turbine blade is covered with a substance. Wind turbine blade, characterized in that it is manufactured by the manufacturing method of a wind turbine blade according to claim 1 or 2. A wind turbine generator comprising the wind turbine blade according to claim 3 .

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