JP2023084177A - Horizontal shaft windmill blade - Google Patents

Abstract

To provide a horizontal shaft windmill which is excellent in startability not only in a wind direction orthogonal to a windmill rotating shaft, but even also in a wind direction obliquely blowing in a horizontal direction, and favorable in energy efficiency, and a windmill blade.SOLUTION: In a windmill blade, a lid which can be freely opened and closed in a direction of a rotating shaft is arranged at the rotation inside of the blade, an angle of an opening of the lid is constricted within a desired range, and a plurality of blades each having a pair of wind pass-through reduction parts are arranged at the blade having such a lid in a rotation axial direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a blade mechanism for a horizontal axis wind turbine installation.

A propeller-type wind turbine called a horizontal axis type is generally used for wind turbine equipment for power generation. It is characterized by high energy efficiency. In order to operate the wind turbine efficiently and safely, it is necessary to operate the wind turbine facing the direction of the wind.

The direction of the wind is not constant and changes depending on various factors. Horizontal axis wind turbines actively or passively follow the direction of the wind. An example of an active tracking method is to change the orientation of the nacelle by the force of a motor to match the direction of the wind detected by a separate wind vane. As an example of a passive follow-up method, the wind turbine is configured to catch the wind downwind of the tower, and the nacelle is free so that the wind turbine changes its direction as the wind direction changes.

A vertical axis wind turbine does not need to follow changes in wind direction. Since the axis of rotation is vertical, it is possible to receive wind from any direction in 360 degrees and rotate the windmill.

Solidity is one of the important characteristic factors that characterize the performance of wind turbines. Solidity is defined as "the ratio of the total projected area of the rotor blades to the swept area of the wind turbine". However, the projected area here means the projection on the plane perpendicular to the wind direction.

Windmills have blades that rotate using lift and blades that rotate using drag. Wind turbine blades that use lift have a small solidity and good energy efficiency, but it is difficult to obtain starting torque. Windmill blades that use drag have a large solidity and are easy to obtain starting torque, but the rotation does not exceed the wind speed and energy efficiency is low.

Vertical axis wind turbines sometimes use a combination of both lift and drag blades.

A horizontal axis wind turbine has a horizontal axis of rotation and its axis is parallel to the wind direction. A vertical axis wind turbine has a vertical axis of rotation and the direction of its axis intersects the direction of the wind. Another combination is a horizontal axis wind turbine whose axis of rotation is horizontal and whose axis of rotation intersects the wind direction. However, it should have the same characteristics as a vertical axis wind turbine in terms of energy efficiency and starting torque, and should have a structure in which the rotation axis of the wind turbine is perpendicular to the wind direction. Proposals have been made to rotate it.

In addition, a proposal such as Reference Patent 2 has been made so that the direction of the horizontal axis windmill can be easily changed according to the direction of the wind.

FIG. 11 is a simulated cross-section of the wind-receiving surface of the blades 2 of a horizontal shaft wind turbine having a lift-type cross-sectional shape, viewed from the vertical upper side, and FIG. 12 shows the blades 2 in FIG. It shows the state of blowing in the direction. The wind 11 hitting the blade 2 passes through the airflow 12 from the top, bottom, left, and right of the blade while giving a force to push the blade. The blades have very little starting torque.

FIG. 13 shows the blade of FIG. 11 with the wind blowing horizontally at an angle of 45°. The wind 11 hitting the blade 2 changes its direction along the blade and slips through the air current 13 or from above, below, left and right.

FIG. 14 is a cross-sectional view of blades of a horizontal axis wind turbine using drag blades, viewed from above. The blade 2 is provided with wind crossing reduction portions 9 on the left and right sides. FIG. 15 shows how the wind 11 blows in from a direction orthogonal to the blades of FIG. A wind pool 31 is generated in a portion surrounded by the blades 2 and the wind crossing reducing portion 9, a drag force 21 is generated, and a large starting torque is generated in the wind turbine.

FIG. 16 shows how the wind 11 is blown into the blades of FIG. 14 at an angle of 45° in the horizontal direction. A wind pool 32 is generated in a portion surrounded by the blade 2 and the wind crossing reducing portion 9, and a drag force 22 is generated. A force component 23 in the direction of rotation of the windmill becomes the starting torque of the windmill. Compared to the case where the wind blows perpendicularly to the blades, the portion that receives the wind is smaller, so the generated starting torque is also smaller.

A horizontal axis wind turbine using lift type blades is difficult to obtain starting torque when turning from a stationary state when receiving a wind direction perpendicular to the blades.

A horizontal-axis wind turbine using drag-type blades is easy to obtain starting torque, but its energy efficiency is lower than that of lift-type blades because the rotating traveling wind acts as a resistance to the blades.

Horizontal-axis wind turbines using drag-type blades have difficulty obtaining starting torque when subjected to oblique winds angled horizontally with respect to the wind turbine installation.

Horizontal-axis wind turbines using lift-type blades are significantly less likely to obtain starting torque when subjected to oblique winds angled horizontally with respect to the wind turbine installation.

JP-A-2003-172245 Korean Patent Publication No. 10-2010-0032268

To provide a wind turbine blade that generates high rotational torque when starting a wind turbine in a wind direction orthogonal to a wind turbine rotation axis and has high energy efficiency in horizontal axis wind turbine equipment.

To provide a wind turbine blade having high energy efficiency and generating a high rotational torque in a wind turbine at start-up even when the wind blows obliquely in the horizontal direction with respect to the rotation axis of the wind turbine in horizontal axis wind turbine equipment.

The wind turbine blade is provided with a lid that can be freely opened and closed toward the rotation shaft from the front edge of the blade as a starting point on the rotation inner side of the blade having a lift-type cross section, that is, on the surface on the rotation shaft side. The opening angle of the lid is restricted within a desired range.

A blade having such a lid is provided with a pair of lateral wind rejection reducing portions on the left and right sides.

A plurality of blades each having such a lid and a wind crossing reduction portion are arranged in the direction of the wind turbine rotation axis.

According to the present invention, the blades of the horizontal axis wind turbine are provided with a lid portion that can be opened and closed and a pair of wind cross-through reduction portions on the left and right sides of the lid portion. The blade hangs down under its own weight and forms a bag-like space that catches the wind between the blade, the open lid of the blade, and the cross-wind reduction section. A large rotational torque can be produced. At this time, the lids of the blades below the rotating shaft are closed by their own weight to reduce the resistance of the head wind, so that the horizontal shaft wind turbine facility can be provided with good startability.

According to the present invention, the blades of the horizontal axis wind turbine are provided with a lid portion that can be opened and closed and a pair of wind cross-through reduction portions on the left and right sides of the lid portion. The blade hangs down under its own weight, and since there are multiple bag-like spaces that catch the wind between the blade and the blade's open lid and the wind crossing reduction section, the blade receives the wind even when the wind direction is at an angle to the horizontal direction and reduces the rotational torque. can occur. At this time, the lids of the blades below the rotating shaft are closed by their own weight to reduce the resistance of the head wind, so that the horizontal shaft wind turbine facility can be provided with good startability.

According to the present invention, the blades of the horizontal axis wind turbine are provided with a lid portion that can be opened and closed and a pair of wind cross-through reduction portions on the left and right sides of the lid portion. Since the wind crossing reduction part does not become resistance to the rotation of the wind turbine, it functions as a lift type blade, and energy efficiency is good whether the wind direction is perpendicular to the wind turbine equipment or the wind blows diagonally horizontally. Can provide horizontal axis wind turbine equipment.

According to the present invention, the blades of the horizontal axis wind turbine are provided with a lid portion that can be opened and closed and a pair of wind cross-through reduction portions on the left and right sides of the lid portion. The lid of the blade at the bottom hangs down due to its own weight, and multiple bag-like spaces are formed to receive the wind between the blade and the open lid of the blade and the cross-wind reduction section. By changing the mounting angle, it is possible to provide a horizontal shaft wind turbine facility with good startability in which the starting torque is easily stabilized regardless of the standby position of the wind turbine blades.

Figure 1 shows a horizontal shaft wind turbine having a lid that can be opened and closed by its own weight inside the blades. is a cross-sectional view of a state in which the lid of is closed by its own weight. Fig. 2 shows a horizontal shaft wind turbine having a lid that can be opened and closed by its own weight inside the blades. During high-speed rotation, all lids are closed by centrifugal force and forward wind of rotation, regardless of the position of the blades with respect to the rotating shaft. Fig. 4 shows a cross-sectional view of the state; FIG. 3 shows a first embodiment of the present invention, in which two blades provided with a freely opening and closing lid and a pair of cross-flow reduction parts are attached in series in the direction of the rotation axis. Fig. 3 shows a perspective view; FIG. 4 shows a second embodiment of the present invention, which consists of a blade provided with a freely opening and closing lid and a pair of side wind rejection reduction parts, and the attachment angle of the blade is adjusted at attachment positions adjacent to each other in the rotation axis direction. Fig. 2 shows a perspective view of a modified horizontal axis wind turbine; FIG. 5 is a third embodiment of the present invention, and is a perspective view of a horizontal axis wind turbine facility in which a cross-flow reduction section is added between a pair of blades with a lid that can be freely opened and closed, and a cross-section reduction section is added. show. FIG. 6 is a side view of the horizontal axis wind turbine of FIG. 3 as seen from the rotation axis direction. FIG. 7 is a side view of the horizontal axis wind turbine of FIG. 4 as seen from the rotation axis direction. FIG. 8 shows a perspective view of a state in which the freely openable/closable lid of the blade on the upper part of the rotating shaft is opened downward by its own weight when the horizontal axis wind turbine is in a stationary state or in a low speed rotating state. FIG. 9 shows a horizontal axis wind turbine in which two blades shown in FIG. 8 are connected in the rotation axis direction. FIG. 10 shows a perspective view of the horizontal axis wind turbine with the freely openable lid of the blades closed. FIG. 11 shows a cross-sectional view of the lifting blade as viewed from above. FIG. 12 shows a cross-sectional view simulating a state in which the wind blows in a direction perpendicular to the blades shown in FIG. 11 and an airflow after hitting the blades. FIG. 13 shows a cross-sectional view simulating a state in which wind blows into the blades of FIG. FIG. 14 shows a cross-sectional view of the blade of FIG. 11, viewed vertically from above, simulating a blade provided with a side wind rejection reducing portion. It is also a cross-sectional view of the blade with the wind crossing reduction part and the openable lid of FIG. 8 installed. FIG. 15 is a cross section simulating a state in which the wind blows in a direction orthogonal to the blades shown in FIG. 14 and a state in which a wind pool is generated in the bag-like structure surrounded by the blades and the cross-wind reduction section. Figure shows. 9 is also a cross-sectional view showing a state in which air pools are generated in the bag-like structure surrounded by the blades, the cross-wind leakage reducing portion, and the open lid of FIG. 8. FIG. FIG. 16 shows a cross-sectional view simulating a state in which wind is blown into the blade in FIG. FIG. 17 shows a cross-sectional view simulating a state in which the length of the blades in FIG. 14 is halved and two are connected. FIG. 18 shows a cross-sectional view simulating a state in which wind blows into the blade of FIG. 17 at an angle of 45° in the horizontal direction. FIG. 19 shows a cross-sectional view simulating a state in which wind blows into the blade of FIG. 17 at an angle of 60° in the horizontal direction. FIG. 20 is a perspective view showing a state in which a plurality of wind turbine installations of the present invention are connected and installed in the rotation axis direction.

1 and 2 show the opening and closing states of the blade and lid of the present invention. The blades 2 applied to the wind turbine equipment of the present invention have an airfoil cross-sectional shape. The open lid 4a is connected to the blade by the starting line 7, or part of the blade is separated from the starting line 7, and can be freely opened and closed. The position of the origin 7 on the blade is arbitrary and may be near the leading edge of the blade or near the trailing edge. The position of the origin 7 on the blade also includes being on the outside of the rotation opposite the axis of rotation. The position of the free end of the lid is also arbitrary and can be at the trailing edge of the blade or anywhere between the trailing edge and the origin. The longer the length from the starting line to the free end of the lid, the larger the area used as the wind receiver.

FIG. 1 shows a cross-sectional view of an embodiment of the present invention in a state where the wind is weak and the windmill is stopped or the rotational speed is low. The lid of the blade above the rotating shaft hangs down and opens under its own weight. The maximum opening angle is limited by the position of the stopper. Compared to the state in which the lid is not opened, the open area of the lid increases, so the solidity increases, and the starting torque for the rotation of the windmill increases.

The lid of the blade located below the rotating shaft closes to the blade side by its own weight. Since the wind receiving area is smaller than when the lid is open, it is possible to reduce wind resistance when the blades return to the windward side.

FIG. 2 shows a side view when the wind speed is high and the rotation speed of the wind turbine is sufficiently high. The blade lid is pressed against the blade by the centrifugal force of the windmill and the rotating wind, and is always closed regardless of the position. That is, the solidity becomes smaller. It is possible to eliminate the restrictions on the rotation speed due to the resistance of the advancing wind in the wind receiving part, which is seen in drag type wind turbines.

The length of the lid in the blade length direction may be one over the entire length, divided into a plurality of lids, or arranged intermittently.

When the lid is closed, the lid and the ridge should be as smooth as possible so as not to generate air resistance.

In the closed condition of the lid, the surface of the lid is preferably shaped to be part of the overall blade airfoil profile.

FIG. 3 shows the configuration of an embodiment of the present invention.

The blades 2 applied to the wind turbine equipment of the embodiment of the present invention are laid at regular intervals around the rotating shaft 1 of the wind turbine via arms 3 . The axis of rotation is horizontal and has a positional relationship that intersects the wind direction of the wind 11 .

The term "horizontal" as used herein refers not only to horizontal in a strict sense, but also to horizontal as a concept including, for example, the case where the rotating shaft is installed on a slope of a mountain.

The leading edge of the blade should face downwind when the blade is at the top of the turn. A lid 4 that can be freely opened and closed near the rotation axis is attached to the surface of the blade near the rotation axis, with the axis parallel to the rotation axis as the starting line 7 . The lid is integrated with the blade when it is closed, and the maximum opening angle is up to the stopper 5 when it is open. When the windmill rotates, electricity is generated by the generator 8 connected to the rotating shaft.

Each blade is provided with a pair of side wind rejection reduction portions 9 in the direction of the rotation axis.

FIG. 8 shows a blade 2 provided with a lid 4 that can be opened and closed under its own weight and a wind crossing reducing portion 9 . The crosswind reduction part is joined to both ends of the blade, and can cover at least a shape 4S equivalent to the openable/closable range of the lid of the blade. There may be a gap between the plate and the lid that does not hinder the free opening and closing of the lid.

The opening limit of blade 4 is restricted by stopper 5 . The stopper may be installed on the wind crossing reducing portion 9 or may be installed on the arm 3 .

The restriction on the opening limit of the blade 2 and the lid 4 may be in the form of connecting the blade and the lid with a wire, for example, instead of the form of the stopper.

When the wind turbine is stationary or rotates at a low speed, the blades 2 above the rotating shaft have a freely openable lid 4 that opens downward. A bag-shaped space 30 is formed by a portion surrounded by the blades, the lid, and the side wind rejection reduction portions 9 at both ends.

The bag-like space 30 composed of the blades 2, the lid 4a, and the cross-flow reduction portion 9 receives the wind not only when the wind is orthogonal to the windmill rotation axis, but also when the wind blows obliquely into the windmill rotation axis. function and generate rotational torque in the wind turbine. In other words, the blade, the lid, and the cross-flow reduction portion can be regarded as an oblique wind receiving portion for the wind that blows obliquely.

FIG. 10 shows a state 4b in which the lid of the blade 2 is closed and the wind crossing reduction section 9. As shown in FIG. When the wind turbine is stationary or rotates at a low speed, the blades positioned lower than the rotating shaft fall down and close due to their own weight, resulting in the state shown in this figure. The figure also shows the state in which the windmill is rotating at high speed and the lid is pressed against the blades by the centrifugal force and the wind that advances the rotation. The blade with the lid closed has less resistance to the advancing wind. The wind crossing reduction section alone does not resist the rotating advancing wind. Moreover, even when the wind blows in the direction perpendicular to the windmill, it does not become a wind resistance. Even if the wind blows into the windmill obliquely in the horizontal direction, it passes through along the cross-wind reduction portion, so there is no great resistance.

FIG. 11 is a simulation of a general lift type blade without a lid 4 that can be opened and closed and a wind crossing reduction part 9, and FIG. 12 is a blade in FIG. It shows a state where The wind that hits the blade passes through the airflow 12 from the top, bottom, left, and right of the blade while giving the force to push the blade.

FIG. 13 shows a state in which the wind 11 is blown into the blade 2 of FIG. 11 at an angle of 45° in the horizontal direction. The wind that hits the blades changes its direction and slips through the airflow 13 or from above, below, left and right.

FIG. 14 shows a simulated cross-section of the blade with the freely openable and closable lid 4 attached to the blade 2 and the cross-flow reduction part 9. FIG. It simulates the state of being in

In FIG. 15, since the blade 2, the lid, and the cross-flow reduction portions 9 at both ends form a bag-like space, the wind blown into the blade creates a wind pool 31 and generates a force 21 that pushes the blade. Since the wind does not easily pass through the sides of the blade, the blade can receive a large force from the wind.

FIG. 16 shows the blade of FIG. 14 with the wind blowing at an angle of 45° to the horizontal. The blade, the lid, and the cross-flow reduction portion form an oblique wind-receiving portion, so that a wind pool 32 is generated and a force 22 pushing the blade by the wind is generated. The force 22 can be divided into a force component 23 in the direction of rotation of the windmill and a force component 24 in the direction of the axis of rotation of the windmill, and the force component 23 rotates the windmill.

The wind pool 32 in FIG. 16 has a smaller volume than the wind pool 31 in FIG. 15, and of the drag acting on the blades, only the component force in the blade rotation direction contributes to the rotation of the blades, thus rotating the windmill. power becomes smaller.

FIG. 17 shows two of the blades of FIG. 14 cut in half and connected. The overall blade length is the same. FIG. 18 shows a state in which the wind blows diagonally in the horizontal direction to the blades of FIG. 17 . A wind pool 32 and a wind pool 33 are generated. This doubles the force acting in the direction of rotation of the wind turbine.

FIG. 19 shows a state in which wind is blowing into the blades of FIG. 17 at an angle of 60° in the horizontal direction. Wind pools 34 and 35 are generated. In the wind pool 34, a drag force 25 is generated, and a component force 26 in the direction of rotation of the windmill and a component force 27 in the direction of the rotation axis of the windmill are generated. The force component 26 becomes smaller than the force component 27 . When the angle in the horizontal direction with respect to the windmill is greater than 45°, the force in the direction of rotation of the windmill becomes small. It is considered that 45° on one side is appropriate for the side wind prevention plate to be effective against oblique wind.

In the wind turbine according to the embodiment of the present invention, there is an optimum value for the length of the cross-wind reduction portion 9 according to the length of each blade 2 . In addition, the wind turbine can be rotated in a well-balanced manner when the lengths of the wind crossing reducing portions and the blades are uniform. The ratio of the lengths of the blades and the wind cross-cut reduction section should be configured in a constant ratio.

FIG. 4 shows a second embodiment of the present invention, in which a short opening/closing type blade 2 having a crosswind reduction portion 9 is attached at a different attachment position adjacent to the direction of the wind turbine rotation axis. It is possible to reduce variations in rotational torque with respect to the rotational angle of the wind turbine without increasing the number of blades.

FIG. 5 shows a third embodiment. The structure in which the blades having the short cross-wind reduction parts are connected is the same even if at least one cross-wind reduction part 9 is provided in the middle of one blade as shown in FIG. The lid 4 is also divided in accordance with the intermediate wind blowing reduction portion so as not to interfere with opening and closing.

The horizontal axis wind turbine and blades of the present invention are assumed to be fixedly installed on land without changing the orientation of the facility, but may also be used in a horizontal axis wind turbine installed on a floating body on the sea.

As shown in FIG. 20, when the horizontal axis wind turbine and blades of the present invention are connected and fixed on land without changing their orientation, the energy obtained by a series of wind turbines can be collectively extracted by a single generator 8. , can provide a wind turbine installation suitable for installation in narrow terrain.

According to the horizontal axis wind turbine and the wind turbine blades according to the present invention, when the wind turbine is stationary or in a low rotation state, the tail wind side where the blades are above the rotation axis is the blades and the open lid provided on the blades, the wind side By forming bag-like spaces in multiple places with the drop-out reducing part, even if the wind blows obliquely, the wind turbine can obtain rotational torque, and on the headwind side, the lid of the blade is closed by its own weight. Since the wind crossing reduction unit alone has low wind resistance, it is possible to provide a horizontal axis wind turbine and wind turbine blades with excellent startability.

Further, according to the present invention, it is possible to provide a horizontal axis wind turbine and wind turbine blades that are simple in structure and inexpensive.

In addition, according to the present invention, it is possible to provide a wind turbine facility that can utilize narrow landforms such as footpaths in paddy fields.

In addition, according to the present invention, when the rotation speed of the wind turbine increases, the lid of the blade is closed by the centrifugal force and the forward wind of the rotation regardless of the position of the blade. Also, it becomes possible to provide wind turbine blades.

Further, according to the present invention, since the stand-by positions of the blades can be distributed, it is possible to provide a horizontal axis wind turbine and wind turbine blades that are excellent in startability and energy efficiency.

1 Axis of rotation 2 Blade 2' 2 Blade 3 with different attachment angle Arm 3' 3 Arm 4 with different attachment angle Lid 4a Open lid 4b Closed lid 4S Lid movable range 5 Stopper 6 Lid origination line 7 Post 8 Generator 9 Cross-wind reduction section 9 ′ Wind cross-section reduction section provided in the middle of the blade 11 Wind 12 Airflow after the wind hits the blade at an angle orthogonal to the blade 13 Blade at an oblique angle to the blade Airflow after hitting the wind 21 Force of the wind pushing the blade at an angle perpendicular to the blade 22 Force of the wind pushing the blade at an oblique angle to the blade 23 Direction of wind turbine rotation of the force of the wind pushing the blade at an oblique angle to the blade Component of force 24 Component of force in the wind turbine rotation axis direction of the force that the wind pushes the blade at an oblique angle to the blade 25 Force that the wind pushes the blade at an angle of 60° to the blade Component of force in the direction of wind turbine rotation 27 of the pushing force Component of force in the direction of the wind turbine rotation axis of the force that the wind pushes the blade at an angle of 60° 30 The bag surrounded by the blade, the open lid, and a pair of wind cross-cut reduction parts -shaped space 31 Wind pool due to wind at an angle perpendicular to the blade 32 Wind pool due to wind at an oblique angle to the blade 33 Wind pool due to wind at an angle of 45° to the blade next to 32 Wind pool 34 Angle to the blade at an angle of 60° wind pool caused by the wind

Claims (4)

The wind turbine has a horizontal axis of rotation, and has at least one arm installed radially with respect to the axis of rotation of the wind turbine and at the tip of the arm parallel to the axis of rotation. , a lid that can be freely opened and closed is provided on the rotating shaft, and the opening angle of the lid is restricted within a desired range,
A blade having a lid is provided with a pair of wind crossing reduction parts,
When the wind turbine is stationary or rotating at a low speed, the lid of the blade above the rotating shaft opens downward under its own weight. By creating a space, it receives a large amount of wind and generates rotational torque, and the lid of the blade below the rotating shaft closes under its own weight to reduce headwind resistance, so it functions as a drag-type wind turbine with good startability. When the windmill rotates at high speed, the lid of the blade closes to the blade side due to the centrifugal force caused by the rotation of the windmill and the forward wind caused by the rotation of the windmill, and functions as a lift type windmill.
Two or more horizontal axis wind turbines and blades installed in the direction of the wind turbine rotation axis. The wind turbine has a horizontal axis of rotation, and has at least one arm installed radially with respect to the axis of rotation of the wind turbine and at the tip of the arm parallel to the axis of rotation. , a lid that can be freely opened and closed is provided on the rotating shaft, and the opening angle of the lid is restricted within a desired range,
A blade having a lid is provided with a pair of wind crossing reduction parts,
When the wind turbine is stationary or rotating at a low speed, the lid of the blade above the rotating shaft opens downward under its own weight. By creating a space, it receives a large amount of wind and generates rotational torque, and the lid of the blade below the rotating shaft closes under its own weight to reduce headwind resistance, so it functions as a drag-type wind turbine with good startability. When the windmill rotates at high speed, the lid of the blade closes to the blade side due to the centrifugal force caused by the rotation of the windmill and the forward wind caused by the rotation of the windmill, and functions as a lift type windmill.
A horizontal-axis wind turbine and blades with at least one wind cross-cut reduction part midway through the blades. In a blade provided with a freely opening and closing lid, a blade, and a pair of cross-wind reduction parts, the ratio of the length in the direction of the axis of rotation of the blade and the length in the chord length direction of the cross-wind reduction part is set as a constant ratio, A transverse axis wind turbine and blades according to claim 1 . In claim 2, in a blade provided with a lid, a blade, and a pair of side-wind-missing reduction portions, a side-wind-missing prevention plate is provided in the middle of the blade at a constant rate with respect to the length of the blade in the direction of the wind turbine rotation axis. Horizontal axis wind turbine and blades as described.

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