JP2006152864A - Wind power generator blade and wind power generator equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain good output control performance with excellent maintainability and at low cost.
A plurality of blades 15 are fixed to a hub 16 of a main shaft of a generator. The blade 15 includes a blade body 15a in which the aerodynamic center Xa extends linearly in the rotational radial direction, and a retracted blade section 15b in which the aerodynamic center Xb extends from the tip of the blade body 15a toward the rear side in the rotational direction. Constitute. The pitch angle α is adjusted by generating a torsional force on the blade body 15a by the pressing force Fo generated in the direction of the rotation axis on the swept blade portion 15b by wind.
[Selection] Figure 3

Description

  TECHNICAL FIELD The present invention relates to a wind power generator blade used in a wind power generator that generates power by rotating a power generator with wind power, and a wind power generator including the same.

In recent years, wind power generation in which a blade is provided at a hub at the end of a main shaft to which a generator is connected via a speed increaser and the main shaft is rotated by receiving wind force on the blade so that the generator generates electric power. Equipment has been developed.
In this type of wind turbine generator, the blade pitch angle is fixed as a method of controlling the output, and the stall angle, which controls the output by causing a stall phenomenon due to the air characteristics at a wind speed above a certain level, the pitch angle of the blade A variable pitch type (see, for example, Patent Document 1) that performs output control by changing it is known.
JP 2002-242816 A

By the way, the variable pitch type control method has good performance because it can make the pitch angle optimal according to the wind speed, but has a disadvantage such as poor maintainability and high cost because it has a movable part.
On the other hand, the stall-type control method has a problem that it is inferior in performance although it has good maintainability and low cost because there are no movable parts.

  The present invention has been made in view of the above circumstances, and provides a blade for a wind power generator that is excellent in maintainability and that can obtain good output control performance at a low cost, and a wind power generator equipped with the blade. It is intended to provide.

In order to achieve the above object, a blade for wind power generator according to the present invention is a blade for wind power generator that receives wind and rotates a rotating shaft of the power generator, and an aerodynamic center extends linearly in a rotational radial direction. And an aerodynamic center extending from the tip of the wing body toward the rear side in the rotational direction.
In addition, you may form such a blade for wind power generators from a fiber reinforced plastic.

As described above, since the retracted wing portion is provided with the aerodynamic center extending from the tip of the wing body toward the rear side in the rotation direction, the torsional force is applied to the wing body by the pressing force generated in the direction of the rotation axis on the retracted wing portion by the wind. Therefore, the pitch angle can be easily adjusted by the pressing force without providing a movable part. As a result, excellent output control performance can be obtained with excellent maintainability and low cost.
When such a blade for a wind power generator is formed from fiber-reinforced plastic, both strength and elasticity for twisting are compatible.

  Moreover, the wind power generator of the present invention is a wind power generator provided with a plurality of blades provided on one end side of the rotating shaft of the generator, characterized in that it includes the blades.

  As described above, the blade is provided with the retracted wing portion in which the aerodynamic center extends from the tip end portion of the wing body toward the rear side in the rotation direction. A torsional force is generated in the main body, so that the pitch angle can be easily adjusted according to the pressing force. As a result, excellent output control performance can be obtained with excellent maintainability and low cost.

According to the wind power generator blade of the present invention and the wind power generator equipped with the same, since the aerodynamic center extends from the tip of the blade body toward the rear side in the rotational direction, the blade is moved backward by the wind. By generating a torsional force on the wing body by a pressing force generated in the direction of the rotation axis of the wing portion, the pitch angle can be easily adjusted without providing a movable portion.
Thereby, it is excellent in maintainability, and also the favorable output control performance of a wind power generator can be obtained at low cost.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A wind power generator blade and a wind power generator including the same according to embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing the entire structure of the wind turbine generator according to the present embodiment, FIG. 2 is a schematic cross-sectional view showing the structure of the generator body in the wind turbine generator, and FIG. 3 is for the wind generator according to the embodiment. It is a front view which shows the shape of a braid | blade.

  As shown in FIG. 1 and FIG. 2, the wind turbine generator 11 has a generator body 13 provided at the upper end of a tower 12 that is erected on the ground. Is supported so as to be rotatable in a horizontal plane. Further, the generator body 13 has a hub 16 having a plurality of blades 15 at the tip of the nacelle 14.

  A hub 16 having a plurality of blades 15 is fixed to a distal end portion of a main shaft (rotating shaft) 18 that is rotatably supported by the nacelle 14. The main shaft 18 is connected to the generator 20 via the speed increaser 19. When the main shaft 18 is rotated, the rotation is increased by the speed increaser 19 and transmitted to the generator 20. Power is generated by the generator 20.

  The blade 15 is made of, for example, fiber reinforced plastic (FRP) and has elasticity, and is bent backward in the rotational direction in the vicinity of the tip as shown in FIG. That is, the blade 15 includes a blade main body 15a that extends substantially linearly from the base end side fixed to the hub 16 toward the tip end side, and extends rearward in the rotational direction from the tip end portion of the blade main body 15a. And a retreating wing portion 15b. As a result, the blade 15 has an aerodynamic center Xb in which the wing body 15a has a substantially linear aerodynamic center Xa, whereas the receding wing portion 15b is inclined backward in the rotational direction.

  Here, as shown in FIG. 4, the rotating blade 15 is installed in a state in which the pitch angle α is attached to the rotation direction, so that the wind inflow angle β during rotation is, for example, 10 ° to 14 °. The lift Fy can be obtained efficiently as the predetermined angle. As a result, a fluid force Fr obtained by combining the lift force Fy and the drag force Ft is generated in the blade 15. The fluid force Fr is decomposed into a rotational force Fk that rotates the blade 15 and a pressing force Fo that presses the blade 15 toward the downstream side of the wind, and the main shaft 18 is rotated by the rotational force Fk generated in each blade 15. .

  By the way, when the wind becomes strong, as shown in FIG. 5, the inflow angle β with respect to the rotating blade 15 increases and deviates from a predetermined angle, and the lift Fy cannot be obtained appropriately. In this case, if the pitch angle α of the blade 15 is increased, the inflow angle β is decreased, and the inflow angle β becomes a predetermined angle, and the lift Fy can be appropriately generated.

  Here, in the blade 15 according to the present embodiment, the pitch angle α is adjusted as follows. That is, when the wind becomes strong and the fluid force Fr generated in the blade 15 increases, the pressing force Fo also increases. And this pressing force Fo becomes large also in the backward wing | blade part 15b.

  Here, since the backward wing portion 15b is inclined rearward in the rotational direction with respect to the wing body 15a, as shown in FIG. 6, the pressing force Fo generated in the backward wing portion 15b It occurs along the aerodynamic center Xb inclined backward in the rotational direction with respect to the aerodynamic center Xa. Therefore, a torsional force is generated in the blade body 15a having the aerodynamic center Xa of the blade 15 by the pressing force Fo of the receding wing portion 15b generated along the aerodynamic center Xb.

  As a result, as shown in FIG. 7, the wing body 15a is elastically deformed by this torsional force, and as shown in FIG. 8, it is twisted in the direction in which the pitch angle α is increased as a whole, and the inflow angle β is reduced. , And a predetermined angle. Therefore, an appropriate lift Fy is obtained for the blade 15, and efficient power generation is maintained.

Thus, according to the blade for wind power generators and the wind power generator provided with the same according to the above-described embodiment, the retracted wing part in which the aerodynamic center Xb extends from the tip part of the wing body 15a toward the rear side in the rotation direction. Since 15b is provided, the pitch angle α can be easily adjusted without providing a movable part by generating a torsional force on the blade body 15a by the pressing force Fo generated in the direction of the rotation axis on the swept wing part 15b by the wind. it can. Thereby, excellent output control performance of the wind turbine generator 11 can be obtained with excellent maintainability and low cost.
Moreover, since the blade for wind power generators is formed from fiber reinforced plastic (FRP) having strength and elasticity, it is possible to achieve both moderate strength and moderate elasticity.

It is a front view of the wind power generator which shows the whole structure of the wind power generator concerning one Embodiment of this invention. It is sectional drawing which shows the structure of a generator main body in the wind power generator concerning one Embodiment of this invention. It is a front view which shows the shape of the blade for wind power generators concerning one Embodiment of this invention. It is sectional drawing of the braid | blade for demonstrating the force which arises in the braid | blade for wind power generators concerning one Embodiment of this invention. It is sectional drawing of the braid | blade for demonstrating the inflow angle and pitch angle of the wind in the braid | blade for wind power generators concerning one Embodiment of this invention. It is an AA arrow line view of Drawing 3 explaining the force which arises in the blade for wind power generators concerning one embodiment of the present invention. It is sectional drawing of the braid | blade explaining the twist of the braid | blade for wind power generators concerning one Embodiment of this invention. It is sectional drawing of the braid | blade explaining the inflow angle and pitch angle of the wind in the braid | blade for wind power generators concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Wind power generator 15 Blade 15a Blade body 15b Retreat wing part 18 Main shaft (rotary shaft)
20 Generator Xa, Xb Aerodynamic center

Claims (3)

A wind power generator blade that receives wind and rotates the rotating shaft of the power generator,
A wind turbine comprising: a wing body in which an aerodynamic center extends linearly in a rotational radial direction; and a retracted wing section in which an aerodynamic center extends toward a rear side in the rotational direction from a tip portion of the wing body. Generator blade.   2. The blade for a wind power generator according to claim 1, wherein the blade is made of fiber reinforced plastic. A wind turbine generator comprising a plurality of blades provided on one end side of a rotating shaft of a generator,
A wind turbine generator comprising the blade for a wind power generator according to claim 1 or 2 as the blade.

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