JP6624350B1 - Rectifier - Google Patents

Abstract

A rotating device attached to a rotating shaft and including a blade that receives the flow of fluid and rotates the rotating shaft, wherein the rotating device is supported by the rotating shaft and flows from an upstream side of the rotating shaft. It is characterized in that a resistance suppressor that rotates along the flow of the fluid is provided so as to suppress the resistance applied to the rotating shaft due to the coming fluid.

Description

  The present invention relates to a rectifier.

  For example, wind power generation, tidal power generation, and the like generate power by generating rotational force using the energy of fluid such as wind and tidal current. In wind power generation and tidal power generation, a vertical axis type rotation device such as a Darrieus type in which a rotation axis is provided perpendicular to a fluid is generally used. The vertical axis type rotation device is provided with a blade that receives fluid at the tip of an arm extending radially from the rotation axis. Therefore, in order to efficiently transmit a rotational force from a fluid to a rotary shaft, a blade having a shape that efficiently generates a lift is provided in a vertical axis type rotating device (for example, Patent Document 1).

JP 2013-245564 A

  However, when the fluid passes around the rotation axis of the frame and the rotating device in wind power generation and tidal power generation, the flow of the fluid is disturbed due to the shape of the frame and the rotation axis, so that the frame and the rotation axis and the fluid A so-called separation occurs between the two. In addition, a vortex such as a Karman vortex is generated in a region downstream of the frame and the rotating shaft in a direction in which the fluid passes. Such separation or vortex generated between the frame and the rotating shaft and the fluid causes a pressure drop downstream of the frame and the rotating shaft. Then, a so-called viscous pressure resistance is applied to the frame and the rotating shaft due to the pressure drop. Furthermore, the flow disturbance caused by separation and Karman vortex reach the rotating blades downstream of the frame and rotating shaft, disturbing the flow around the blades, greatly reducing the efficiency of conversion to rotational power. Let it.

  In other words, in wind power generation and tidal power generation, excessive resistance is applied to the frame due to the viscous pressure resistance of the fluid, so it is necessary to increase the strength of the frame itself and the strength when fixing the frame to a harbor structure etc. There is a possibility that an increase in frame manufacturing cost, an increase in transport cost due to an increase in frame weight, an increase in frame installation cost, and the like may occur. In addition, the flow around the blade may be disturbed by the turbulence of the flow or the vortex such as the Karman vortex, which may cause a decrease in power generation efficiency.

  Further, when a turbulence such as a turbulent flow or a Karman vortex is generated near the water surface, a wave is generated on the water surface, so that a so-called wave-making resistance is applied to the frame and the rotation axis. As a result, as described above, there is a possibility that an increase in frame manufacturing cost, an increase in transport cost due to an increase in frame weight, an increase in frame installation cost, and the like may occur.

A main aspect of the present invention for solving the above-described problems is a rotating device that is attached to a rotating shaft and includes a blade that receives the flow of a fluid and rotates the rotating shaft. An axis is supported by the rotating shaft so as to be adjacent to the shaft, and the fluid flowing from the upstream side of the rotating shaft causes the fluid to flow, so as to suppress the resistance applied to the rotating shaft. A resistance suppressor that rotates along the direction of flow of the fluid in the state where the resistance suppressor rotates from the upstream side to the downstream side of the fluid. It is characterized in that it is formed so that the thickness in a direction along the direction along the direction along the flow direction of the fluid is small .

  Other features of the present invention will be apparent from the accompanying drawings and the description of the present specification.

  ADVANTAGE OF THE INVENTION According to this invention, since the turbulence of the fluid flow which arises in the area | region downstream of the rotating shaft of the rotating device placed in the fluid and the generation of vortices such as Karman vortices can be suppressed, it is caused by the rotating shaft. By suppressing the turbulence of the tidal current and rectifying the flow, the power generation efficiency can be improved.

  Furthermore, according to the present invention, even in a situation where the frame is provided so as to surround the rotating device, similarly, it is possible to suppress the occurrence of turbulence such as a flow turbulence and a Karman vortex generated in a region on the downstream side of the frame. The viscous pressure resistance generated in the frame can be suppressed. As a result, the frame can be manufactured with low strength, and the manufacturing cost of the frame can be reduced. Further, since the weight of the frame can be reduced and the method of fixing the frame to a port structure can be simplified, the installation cost of the frame can be reduced. In addition, since the turbulence of the flow can be suppressed by rectifying the flow of the fluid, the power generation efficiency can be improved.

  In addition, it is possible to suppress waves that may be generated on the water surface due to the occurrence of turbulence such as the turbulence of the flow or the Karman vortex near the water surface. As a result, the frame can be manufactured with low strength, and the manufacturing cost of the frame can be reduced. Further, since the weight of the frame can be reduced and the method of fixing the frame to a port structure can be simplified, the installation cost of the frame can be reduced. In addition, since the turbulence of the flow can be suppressed by rectifying the flow of the fluid, the power generation efficiency can be improved.

It is a perspective view showing an example of a rectifier concerning a 1st embodiment. It is a perspective view showing an example which expanded a rectifier concerning a 1st embodiment. It is a top view showing an example of the rectifier concerning a 1st embodiment seen from + Y direction. It is a top view showing an example which looked at the situation where the rectification device concerning a 1st embodiment turns from + Y direction. It is a perspective view showing an example which expanded a rectifier concerning a 2nd embodiment. It is a top view showing an example of the rectification device concerning a 2nd embodiment seen from + Y direction. It is a perspective view showing an example in which a flange was provided in a resistance control body of a rectifier concerning a 2nd embodiment. It is a perspective view showing an example of a variation of a resistance control body of a rectifier concerning a 2nd embodiment. It is a perspective view showing an example of a rectification device concerning a 3rd embodiment. It is a perspective view showing an example which expanded a frame resistance control body of a rectifier concerning a 3rd embodiment. It is a top view showing an example which looked at a frame resistance control body arranged in a frame member provided horizontally of a rectifier concerning a 3rd embodiment from + Z direction. It is a perspective view showing an example of a variation of a resistance control body of a rectifier concerning other embodiments. It is a perspective view showing an example of a variation of a resistance control body of a rectifier concerning other embodiments. It is a perspective view showing an example of a rotation device of a perpendicular axis type. It is a perspective view showing an example in which a frame is provided in a rotation device of a perpendicular axis type. It is a top view which shows an example which looked at the turbulence of the flow which arises in the rotating shaft of a rotating device of a vertical axis type | system | group, and the Karman vortex generation situation from + Y direction. It is a perspective view which shows the turbulence of the flow which arises in the rotating shaft of a rotating device of a vertical axis type | system | group, and the generation situation of Karman vortex. It is a perspective view which shows the turbulence of the flow which arises in the flame | frame surrounding the rotation apparatus of a vertical axis type | system | group, the Karman vortex, and the generation situation of a wave. It is a lineblock diagram showing an example of a power generator.

  At least the following matters will be made clear by the description in the present specification and the accompanying drawings.

  In the following description, the Y axis is a direction along the rotation axis 100A, and the X axis and the Z axis are axes perpendicular to the Y axis. 1 to 19, the same members will be described with the same numerals. In the following description, unless otherwise specified, it is assumed that the fluid flows from the minus side to the plus side along the X axis. Further, the side of the rotating shaft 100 and the frame 130 in the direction in which the fluid flows may be referred to as “downstream side”, and the side in the direction in which the fluid flows may be referred to as “upstream side”. Further, the direction along the X axis may be referred to as “X direction”, the direction along the Y axis may be referred to as “Y direction”, and the direction along the Z axis may be referred to as “Z direction”. In each of the “X direction”, “Y direction”, and “Z direction”, “+” is added to the + side and “−” is added to the − side in some cases. In addition, a cross section of the rectifier divided by a plane including the X axis and the Z axis may be referred to as “XZ cross section”.

=== Rotating device 200 in which rectifying device is arranged ===
<< Rotating device 200 >>
With reference to FIGS. 14, 15, and 19, a description will be given of a configuration of a rotating device 200 related to, for example, a power generator 1000 in which the rectifying device according to the present embodiment is installed. The present invention is not limited to a power generator, but can be widely applied to a general device using rotational power.

  FIG. 14 is a perspective view illustrating an example of a vertical axis type rotation device 200. FIG. 15 is a perspective view showing an example in which a frame 130 is provided in a vertical axis type rotation device 200. FIG. 19 is a configuration diagram illustrating an example of the power generation device 1000.

  As shown in FIG. 19, the rotating device 200 is a device that transmits a rotating force to the speed increasing device 300 of the power generating device 1000 via the rotating shaft 100, for example. The speed increaser 300 is a device that increases the rotation speed of the rotating shaft 100 and transmits the rotation speed to the generator 400. The power generation device 1000 is, for example, a wind power generation device or a hydroelectric power generation device. The wind power generation device is a power generation device that utilizes wind pressure energy generated by wind, and the hydraulic power generation device is a power generation device that utilizes hydraulic energy generated by water flow to rotate a turbine to generate power. The rotating device 200 in which the rectifying device according to the present embodiment is arranged is, for example, a rotating device of a vertical axis type power generating device such as a Darrieus type. The present embodiment will be described using a tidal power generation device as an example among the hydraulic power generation devices, but can be similarly applied to other hydraulic power generation devices and wind direct power generation devices.

  As shown in FIG. 14, the rotating device 200 of the tidal current power generator includes a rotating shaft 100 and a blade 120. The rotating shaft 100 has, for example, one end in the X direction connected to the gearbox 300. The rotating shaft 100 transmits a rotating force to the gearbox 300. The rotation shaft 100 rotates, for example, in a clockwise direction (hereinafter, referred to as a “rotation direction”) when a blade 120 described later is viewed from the + Y direction. The following description is based on a provisional line passing through the center of the rotating shaft 100 as a center line. The blade 120 is a member that obtains a lift in the rotation direction by the flow of the fluid. The blade 120 is rotating around the rotation axis 100. Note that the blade 120 includes an arm 110 provided on the + Y direction side of the blade 120 and an arm 111 provided on the −Y direction side. The blade 120 transmits the lift in the rotation direction to the rotation shaft 100 via the arms (110, 111) as the rotation force in the rotation direction. The arms (110, 111) extend, for example, radially from the rotation shaft 100, and the end opposite to the rotation shaft 100 is connected to the blade 120.

  As shown in FIG. 15, the rotating device 200 of the tidal current generator is fixed to the frame 130 underwater. In the frame 130, for example, the frame member 131 is fixed to a concrete structure such as a bay structure or a pier foundation. The frame 130 may be fixed on a foundation such as concrete installed on the sea floor, or may be fixed on a floating body installed on the sea surface. The frame 130 supports the rotating shaft 100 via bearings (140A, 140B) so that the rotating shaft 100 can rotate, for example.

  In the above description, the rotating device 200 has been described as being of the vertical axis type. The mode in which the rotating shaft 100 is installed is not limited. Further, the rotating device 200 may have a curved portion in which the blade 120 of the rotating device 200 is attached, and may be directly attached to the rotating shaft 100 without passing through the arms (110, 111). In the following description, a case where the rotating shaft 100 of the rotating device 200 is provided vertically (Y direction) will be described.

<< Resistance due to fluid >>
With reference to FIGS. 16, 17, and 18, a description will be given of the turbulence of the flow and the vortex such as the Karman vortex generated in the rotating shaft 100 and the frame 130. FIG. 16 is a plan view showing an example of a flow turbulence and a Karman vortex generated on the rotation axis 100 of the vertical axis type rotation device 200 as viewed from the + Y direction. FIG. 17 is a perspective view showing a turbulence of flow and a Karman vortex generated on the rotating shaft 100 of the rotating device 200 of the vertical axis type. FIG. 18 is a perspective view showing a turbulent flow, a Karman vortex, and waves generated in a frame surrounding a vertical axis type rotating device. For convenience of explanation, it is assumed that a fluid such as wind or water flows from the −X direction toward the + X direction.

  As shown in FIG. 16, when the fluid passes through the rotating shaft 100, a pressure drop occurs on the downstream side of the rotating shaft 100. Viscous pressure resistance is applied to the rotating shaft 100 by the pressure reducing portion. In addition, vortex resistance is generated on the rotating shaft 100 due to turbulence in the flow caused by the pressure drop portion or vortex such as Karman vortex (hereinafter referred to as “vortex”). Furthermore, a wave is generated near the water surface due to turbulence or vortex of the flow caused by the rotating shaft 100 or the frame 130 near the water surface, so that wave-making resistance is generated on the rotating shaft 100 or the frame 130. FIG. 16 shows the turbulence and the vortex of the flow of the rotating shaft 100, but the turbulence and the vortex of the flow also occur in the frame 130. Note that the turbulence in the flow is a turbulence caused by a change in the direction of the flow or separation of the fluid caused by an effect such as a shape of an object arranged in the fluid. The vortex is a vortex generated alternately on the downstream side (+ X direction side) of the obstacle when the obstacle is arranged in the fluid.

  When the frame 130 is disposed in the fluid, the flow of the above-described flow is downstream of the frame member 131 provided in parallel (Y direction) with respect to the rotation axis 100 and the frame member 132 provided in vertical (Z direction). Eddy resistance due to turbulence and vortices occurs. Further, near the water surface of the frame members (131, 132), waves are generated due to turbulence or eddies in the flow. Thereby, wave-making resistance due to waves is generated in the frame members (131, 132).

  As shown in FIG. 17, the turbulence and the vortex of the flow occur when the fluid reaches the rotation shaft 100 from the upstream side of the rotation shaft 100 and the fluid flows downstream along the peripheral surface of the rotation shaft 100. Occurs in the area 100 downstream. The turbulence and the vortex of the flow reach the blade 120 rotating around the rotation axis 100 on the downstream side of the rotation axis 100. The tidal flow around the blade 120 is disturbed, and hinders rotation. Further, when the blade 120 is near the water surface, the flow of the fluid is disturbed by the influence of the waves generated by the rotating shaft 100 and the frame 130, which hinders the rotation of the blade 120.

  As shown in FIG. 18, the turbulence and the vortex of the flow are such that the fluid reaches the frame members (131, 132) from the upstream side of the frame 130 and the fluid flows downstream along the peripheral surface of the frame members (131, 132). Occurs in the region on the downstream side of the frame members (131, 132). The turbulence and the vortex of the flow reach the blade 120 rotating around the rotation axis 100 on the downstream side of the frame member (131, 132), and the tidal flow around the blade 120 is disturbed to hinder the rotation. Cause. Further, when the blade 120 is near the water surface, the flow of the fluid is disturbed by the influence of the waves generated by the frame members (131, 132), so that the rotation of the blade 120 is hindered.

  As described above, the turbulence and vortex of the flow disturb the flow around the blade 120 and reduce the efficiency of the blade 120 converting the kinetic energy of the fluid into the rotational power of the shaft. , 30). Hereinafter, the rectifiers (10, 20, 30) will be described in detail.

=== Rectifier 10 according to First Embodiment ===
The rectifier 10 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view illustrating an example of a rectifier 10 according to the first embodiment. FIG. 2 is a perspective view illustrating an example in which the rectifier 10 according to the first embodiment is enlarged. FIG. 3 is a plan view illustrating an example of the rectifier 10 according to the first embodiment as viewed from the + Y direction. FIG. 4 is a plan view showing an example of a situation where the rectifying device 10 according to the first embodiment rotates as viewed from the + Y direction.

  The rectification device 10 is a device that suppresses turbulence and vortices of a flow generated on the downstream side of the rotating shaft 100 disposed in the fluid. In addition, the rectifier 10 can suppress the generation of waves near the water surface. Note that the rectifier 10 is not used only for the rotating shaft 100 in the present embodiment, and in a situation where a fluid flows in the X direction, for example, an object provided in the fluid in a substantially Y direction or a substantially Z direction. Also applicable to:

== Configuration ==
The rectifier 10 according to the first embodiment is a device that suppresses turbulence and vortex of a flow generated downstream of the rotating shaft 100 by rotating a resistance suppressor 11 described below in a direction in which a fluid flows. . As shown in FIG. 1, the rectifying device 10 is configured such that a resistance suppressing body 11 is rotatably supported on a rotating shaft 100 via a bearing 12 described later. The rectifying device 10 is arranged between an arm 110 on the + Y direction side and an arm 111 on the −Y direction side that extend from the rotating shaft 100. Thereby, as shown in FIG. 2, the rectifier 10 can suppress turbulence and vortex of the flow generated downstream of the rotating shaft 100 between the arm 110 on the + Y direction side and the arm 111 on the −Y direction side. Although not shown, the rectifier 10 may be installed between the bearing 140A and the arm 110, between the arm 111 and the bearing 140B, or on the rotating shaft 100 on the −Y direction side of the bearing 140B. good. The resistance suppressor 11 may be installed on the rotating shaft 100 near the water surface. Thereby, the rectifier 10 can suppress the generation of waves generated on the water surface on the downstream side of the rotating shaft 100.

  The rectifier 10 includes, for example, a resistance suppressor 11 and a bearing 12. Hereinafter, the resistance suppressor 11 and the bearing 12 will be described in detail.

<<< resistance suppressor 11 >>
The resistance suppressing body 11 is a member that suppresses turbulence and vortex of the flow downstream of the rotating shaft 100. The resistance suppressing body 11 is provided on the rotating shaft 100 via a bearing 12 described later. The resistance suppressing body 11 is formed of, for example, a stainless material, and is formed such that the thickness in the Z direction becomes thinner toward the downstream side from the rotation shaft 100 as shown in FIG.

  In the resistance suppressing body 11, the width in the Z direction is referred to as a blade thickness, and the length in the X direction is referred to as a chord length. The resistance suppressing body 11 has a wing thickness that is not damaged by the force generated by the rotation. The resistance suppressor 11 has a chord length that does not contact the blade 120 when placed on the rotation shaft 100. The resistance suppressor 11 has a blade thickness that increases from one end in the −X direction (a leading edge described later) to the rotation axis 100 and decreases from the rotation axis 100 to the other end (a trailing edge described later) in the + X direction. Is formed. Specifically, for example, the XZ section has a streamlined shape. The streamlined shape refers to a shape in which one end on the upstream side (−X direction side) is round and the other end on the downstream side (+ X direction side) is sharp in a state where the resistance suppressing body 11 is along the flow direction. The resistance suppressor 11 is formed symmetrically in the Z direction about the X direction (chord lines described later). The resistance suppressor 11 is continuously provided, for example, continuously from near the lower part of the joint of the arm 110 on the + Y direction side of the rotation shaft 100 to near the upper part of the joint of the arm 111 on the −Y direction side. . Since the resistance suppressor 11 has a symmetrical streamline shape, the resistance received from the fluid passing from one end to the other end can be reduced, so that turbulence and eddies in the flow can be suppressed. In addition, generation of waves can be suppressed near the water surface.

  In FIG. 3, in a state where the resistance suppressing body 11 is along the flow direction of the fluid, one end of the resistance suppressing body 11 in the −X direction is a front edge, the other end in the + X direction is a rear edge, and the front edge and the rear edge are A tentative line connected by straight lines is shown as a chord line. The resistance suppressing body 11 is arranged so that the center line of the rotating shaft 100 and the chord line intersect. The resistance suppressing body 11 is disposed so that the aerodynamic center comes downstream (on the + X direction side) of the rotation shaft 100. As a result, as shown in FIG. 4, when the flow of the fluid changes, the resistance suppressing body 11 can quickly rotate so that the chord lines follow the flow of the fluid.

<< Bearing 12 >>
The bearing 12 is provided between the rotating shaft 100 and the resistance suppressing body 11. The bearing 12 is a member that suppresses friction of the rotating shaft 100 with the resistance suppressing body 11 when the resistance suppressing body 11 rotates around the peripheral surface of the rotating shaft 100. That is, the bearing 12 is a member that suppresses energy loss and heat generation that occur in the resistance suppressor 11 and the rotating shaft 100. The bearing 12 is, for example, a ball bearing formed of a stainless material. The bearing 12 is provided at at least one end in the + Y direction and the other end in the −Y direction of the resistance suppressing body 11 so that the resistance suppressing body 11 can rotate without contacting the rotating shaft 100, for example. The bearing 12 preferably includes, for example, a thrust collar so that the resistance suppressing body 11 does not move in the Y direction with respect to the rotating shaft 100.

== Operation ==
The operation of the rectifier 10 will be described with reference to FIGS.

  As shown in FIG. 3, in a state where the fluid is flowing from the −X direction toward the + X direction, the resistance suppressing body 11 of the rectifier 10 has the leading edge arranged in the −X direction and the trailing edge arranged in the + X direction. To rotate. That is, the resistance suppressing body 11 rotates so that the chord lines thereof are along the direction of the fluid flow. Since the resistance suppressor 11 has a streamline shape, turbulence and eddies of the flow are suppressed on the + X direction side. In addition, generation of waves can be suppressed near the water surface.

  As shown in FIG. 4, the resistance suppressing body 11 rotates so that the leading edge is arranged in the direction in which the fluid flows when the fluid flow is inclined in, for example, the −Z direction with respect to the X direction. Move. That is, the resistance suppressing body 11 rotates so that the chord lines thereof are along the direction of the fluid flow. Specifically, the chord line of the resistance suppressor 11 indicated by the solid line rotates along the flow direction of the fluid indicated by the broken line so as to become the resistance suppressor 11 indicated by the broken line.

=== Rectifier 20 according to Second Embodiment ===
The rectifier 20 according to the second embodiment will be described with reference to FIGS. 5, 6, 7, and 8. FIG. FIG. 5 is a perspective view illustrating an example in which the rectifier 20 according to the second embodiment is enlarged. FIG. 6 is a plan view illustrating an example of the rectifier 20 according to the second embodiment viewed from the + Y direction. FIG. 7 is a perspective view illustrating an example in which a flange is provided on the resistance suppressing body 21 of the rectifier 20 according to the second embodiment. FIG. 8 is a perspective view illustrating an example of a variation of the resistance suppressor 21 of the rectifier 20 according to the second embodiment. Note that portions not shown in FIGS. 5 to 8 are the same as those in FIG. 1, and thus description thereof will be omitted.

== Configuration ==
The rectification device 20 according to the second embodiment is a device that suppresses turbulence and vortex of a flow generated on the downstream side of the rotating shaft 100 by rotating a resistance suppressor 21 described later in a direction in which a fluid flows. . In addition, generation of waves can be suppressed near the water surface.

  As shown in FIG. 5, since the resistance suppressing body 21 of the rectifier 20 is supported by the rotating shaft 100 via the bearing 22, the friction in the rotational direction is indirectly transmitted from the rotating shaft 100 via the bearing 22. (Hereinafter referred to as “rotational friction force”). The rectifying device 20 is tilted in the rotation direction to a considerable extent due to the rotational friction force. Therefore, the rectifying device 20 according to the second embodiment is configured to correct the inclination of the resistance suppressing body 21 by taking the rotational frictional force into consideration.

  The rectifying device 20 is disposed between the + Y direction side arm 110 and the −Y direction side arm 111 which are extended from the rotating shaft 100. Accordingly, the rectifier 20 can suppress turbulence and vortex of the flow generated downstream of the rotary shaft 100 between the arm 110 on the + Y direction side and the arm 111 on the −Y direction side. In addition, generation of waves can be suppressed near the water surface.

  The rectifier 20 is configured to include, for example, a resistance suppressor 21 and a bearing 22. Note that the bearing 22 is the same as the bearing 12 of the rectifier 10 according to the first embodiment, and a description thereof will be omitted.

<<< resistance suppressor 21 >>
The resistance suppressor 21 is a member that suppresses turbulence and eddies in the flow downstream of the rotating shaft 100. It is a member that suppresses the generation of waves near the water surface. The resistance suppressor 21 is provided on the rotating shaft 100 via a bearing 22. The resistance suppressing body 21 is formed of, for example, a stainless steel material, and is formed such that the thickness in the Z direction becomes thinner toward the downstream side from the rotation shaft 100. The shape of the resistance suppressing body 21 will be specifically described as follows.

  As shown in FIG. 6, in the resistance suppressor 21, the width in the Z direction is referred to as a blade thickness, and the length in the X direction is referred to as a chord length. The resistance suppressing body 21 has such a wing thickness as not to be damaged by the force generated by the rotation. The resistance suppressor 21 has a chord length that does not contact the blade 120 when placed on the rotation shaft 100. The resistance suppressor 21 is configured such that the blade thickness increases from one end in the −X direction (a leading edge described later) to the rotation axis 100 and decreases from the rotation axis 100 to the other end (the trailing edge described later) in the + X direction. Is formed. Specifically, for example, the XZ section has an airfoil shape.

  The airfoil has a shape in which one end on the upstream side (−X direction side) is round and the other end on the downstream side (+ X direction side) is sharp in a state where the resistance suppressing body 21 is along the flow direction. Further, in the airfoil, the peripheral surface on the −Z direction side is formed to be more rounded than the peripheral surface on the + Z direction side with respect to the X axis. That is, the resistance suppressing body 21 is formed asymmetrically in the Z direction with the X direction (chord lines described later) as the center. The airfoil is, for example, NACA63A016 defined by NACA, the precursor of NASA. As a result, the flow velocity in the −Z direction side is faster than the flow velocity in the + Z direction side of the resistance suppressor 21, so that the pressure in the −Z direction side is smaller than the pressure in the + Z direction side, and the lift is −Z. Occurs towards the direction. That is, the resistance suppressing body 21 is formed so that the rotational friction force and the lift force are equal to suppress the turbulence and the vortex of the flow.

  In addition, when the resistance suppressor 21 rotates in the −Z direction due to lift or the like and a state in which the flow of the fluid is interrupted occurs, the lift angle decreases because the angle of attack of the resistance suppressor 21 decreases. In this case, the resistance suppressor 21 blocks the flow of the fluid, so that the pressure on the peripheral surface on the −Z direction side of the resistance suppressor 21 increases. Therefore, the resistance suppressor 21 does not rotate beyond a certain angle with respect to the flow direction, and thus does not generate turbulence or vortex on the downstream side of the resistance suppressor 21. Further, when the resistance suppressor 21 rotates in the + Z direction due to rotational frictional force or the like and interrupts the flow, the lift angle increases because the angle of attack of the resistance suppressor 21 increases. In this case, the resistance suppressor 21 blocks the flow of the fluid, so that the pressure on the peripheral surface of the resistance suppressor 21 on the + Z direction side increases. Therefore, the resistance suppressor 21 does not rotate beyond a certain angle with respect to the flow direction, and thus does not generate turbulence or vortex on the downstream side of the resistance suppressor 21.

  The resistance suppressing body 21 is continuously provided, for example, without break from near the lower part of the joint of the arm 110 on the + Y direction side of the rotating shaft 100 to near the upper part of the joint of the arm 111 on the −Y direction side. .

  In FIG. 6, in a state where the resistance suppressing body 21 is along the flow direction of the fluid, one end of the resistance suppressing body 21 in the −X direction is a front edge, the other end in the + X direction is a rear edge, and the front edge and the rear edge are A tentative line connected by a straight line is a chord line, and a tentative line indicating the middle of the distance along the Z axis between the peripheral surface on the −Z side and the peripheral surface on the + Z side with the chord line as a boundary is shown as an intermediate line. . The resistance suppressing body 21 is arranged so that the center line of the rotating shaft 100 and the chord line intersect. The resistance suppressing body 21 is arranged so that the aerodynamic center is located on the downstream side (+ X direction side) of the rotating shaft 100. Thereby, the resistance suppressing body 21 can rotate so that the chord line follows the flow of the fluid when the flow of the fluid changes. At this time, as described above, the rotation is performed so that the lift force and the rotational friction force become equal.

  Further, in the resistance suppressor 21, as described above, since the pressure in the −Z direction is smaller than the pressure in the + Z direction, a flow is generated at both ends in the Y direction from the + Z direction to the −Z direction. . Thereby, a vortex is generated at both ends of the resistance suppressing body 21 in the Y direction. Therefore, as shown in FIG. 7, the resistance suppressing body 21 may be provided with flanges (21A, 21B) in order to suppress the resistance due to the vortex generated at both ends. The flanges (21A, 21B) include, for example, a first flange 21A on the + Y direction side and a second flange 21B on the −Y direction side. The flanges (21A, 21B) are provided at both ends in the Y direction of the resistance suppressing body 21 in a flange shape with respect to the resistance suppressing body 21.

  Further, as described above, the resistance suppressor 21 has been described so that the XZ cross section has an airfoil shape, but is not limited thereto. For example, in the resistance suppressing body 21C as shown in FIG. 8, the end surface on the + Y direction side is formed symmetrically in the Z direction about the X direction (first resistance suppressing body), and the middle part in the Y direction is centered on the X direction. May be formed asymmetrically in the Z direction (second resistance suppressor), and the end surface on the −Y direction side may be formed symmetrically in the Z direction about the X direction. Accordingly, since both ends in the Y direction are formed symmetrically, the resistance suppressor 21 suppresses the generation of a wing tip vortex without causing a flow in the Z direction at both ends, thereby suppressing the induced resistance. Moreover, since the intermediate portion is formed asymmetrically, the resistance suppressor 21C can rotate so that the rotational friction force and the lift force are balanced.

== Operation ==
The operation of the rectifier 20 will be described with reference to FIG.

  As shown in FIG. 6, in a state where the fluid is flowing from the −X direction toward the + X direction, the leading edge is arranged in the −X direction, and the trailing edge is located in the + X direction when the fluid is flowing from the −X direction toward the + X direction. To rotate. Further, the rotation is performed so that the lift force and the rotational friction force become equal. That is, the resistance suppressing body 21 rotates so that the chord lines thereof are along the direction of the fluid flow. Since the resistance suppressing body 21 has an airfoil shape, turbulence and eddies of the flow are suppressed on the + X direction side. In addition, generation of waves can be suppressed near the water surface. When the flow of the fluid changes, the resistance suppressor 21 moves in the same manner as the resistance suppressor 11 according to the first embodiment, and a description thereof will be omitted.

=== Rectifier 30 according to Third Embodiment ===
A rectifier 30 according to the third embodiment will be described with reference to FIGS. 9, 10, and 11. FIG. FIG. 9 is a perspective view illustrating an example of the rectifier 30 according to the third embodiment. FIG. 10 is a perspective view illustrating an example in which the frame resistance suppressor 33 of the rectifier 30 according to the third embodiment is enlarged. FIG. 11 is a plan view showing an example of a frame resistance suppressor 33B disposed on a horizontally provided frame member 132 of the rectifier 30 according to the third embodiment as viewed from the + Z direction.

  The rectification device 30 is a device that suppresses turbulence and vortices of the flow generated downstream of the rotation shaft 100 and the frame 130 disposed in the fluid. In addition, generation of waves can be suppressed near the water surface. In addition, the rectifying device 30 is not used only for the rotating shaft 100 and the frame 130, but is applicable to an object provided in the fluid in a substantially Y direction or a substantially Z direction when the fluid flows in the X direction. it can.

== Configuration ==
The rectifier 30 according to the third embodiment is configured by adding a frame resistance suppressor 33 described below to the rectifier (10, 20) according to the first or second embodiment. The rectifying device 30 suppresses turbulence and vortices of the flow generated on the downstream side of the rotating shaft 100 and the frame 130 by rotating the resistance suppressing body 31 and a frame resistance suppressing body 33 described later along the direction in which the fluid flows. Device. In addition, generation of waves can be suppressed near the water surface. When the fluid is flowing in the X direction, the frame 130 includes, for example, a frame member 131 provided substantially in the Y direction with respect to the flow of the fluid, and the frame member 131 in the substantially Z direction with respect to the flow of the fluid. And a frame member 132 provided. Further, a temporary line passing through the centers of the frame members 131 and 132 will be described below as a center line.

<< Frame resistance suppressor 33 >>
The frame resistance suppressor 33 is a member that suppresses turbulence and eddies in the flow downstream of the frame members 131 and 132. The frame resistance suppressing body 33 includes a frame resistance suppressing body 33A disposed on the frame member 131 and a frame resistance suppressing body 33B disposed on the frame member 132.

  The frame resistance suppressor 33 is provided on the frame member 131 and the frame member 132 via the bearing 32. The frame resistance suppressing body 33 is formed of, for example, a stainless steel material, and is formed so that the thickness in the Z direction decreases toward the downstream side from the frame members 131 and 132. The shapes of the frame resistance suppressors 11A and 11B will be specifically described below. The frame resistance suppressor 33A according to the third embodiment has a shape similar to the resistance suppressor 11 according to the first embodiment. Therefore, the leading edge, trailing edge, chord line, and aerodynamic center of the frame resistance suppressor 33A according to the third embodiment are as shown in FIG.

  In the frame resistance suppressor 33A, the width in the Z direction is referred to as a blade thickness, and the length in the X direction is referred to as a chord length. The frame resistance suppressing body 33A has such a wing thickness that it is not damaged by the force generated by the rotation. The frame resistance suppressing body 33 </ b> A has a chord length that does not make contact with the blade 120 when arranged on the frame member 131. The frame resistance suppressing body 33A is formed such that the blade thickness increases from the front edge to the frame member 131 and the blade thickness decreases from the frame member 131 to the rear edge. Specifically, for example, the XZ section has a streamlined shape. The frame resistance suppressing body 33A is formed symmetrically in the Z direction about the chord line. The frame resistance suppressing body 33 </ b> A is provided continuously, for example, without a break across both ends of the frame member 131 in the long axis direction (Y direction). Since the frame resistance suppressing body 33A has a symmetrical streamline shape, the resistance received from the fluid passing from the leading edge to the trailing edge can be reduced, so that the turbulence and the vortex of the flow can be suppressed. In addition, generation of waves can be suppressed near the water surface.

  The frame resistance suppressing body 33A is disposed so that the center line of the frame member 131 and the chord line intersect. The frame resistance suppressing body 33A is arranged so that the aerodynamic center is located on the downstream side (+ X direction) of the frame member 131. Thereby, the frame resistance suppressing body 33A can rotate so that the chord lines follow the flow of the fluid when the flow of the fluid changes.

  The frame resistance suppressor 33B may have the same shape as the frame resistance suppressor 33A described above. However, since the frame resistance suppressor 33B is disposed on the frame member 132 provided perpendicular to the rotation axis 100, the frame resistance suppressor 33B receives a force in the −Y direction due to gravity and a force in the + Y direction due to buoyancy and lift from the fluid. Therefore, in the frame resistance suppressing body 33B, as a more preferable shape, as shown in FIG. 11, a fluid passing through the axis of the frame member 132 such that the XY cross section cancels out the resultant force of buoyancy and lift and gravity. Is formed asymmetrically with respect to the direction of the flow. More specifically, the XY cross section has an airfoil shape.

== Operation ==
The operation of the rectifier 30 will be described with reference to FIG. Note that the resistance suppressors 31 of the rectifier 30 according to the third embodiment are the same as the resistance suppressors (11, 21) of the rectifiers (10, 20) according to the first and second embodiments. , The description of which is omitted. Hereinafter, the frame resistance suppressor 33 of the rectifier 30 will be described.

  As shown in FIG. 10, when the fluid is flowing from the −X direction toward the + X direction, the front edge is disposed in the −X direction, and the rear edge is + X. Rotate so as to be arranged in the direction. That is, the frame resistance suppressor 33 rotates so that the chord lines thereof are along the direction of the fluid flow. Since the frame resistance suppressor 33 has a streamlined shape, turbulence and eddies of the flow are suppressed on the + X direction side. In addition, generation of waves can be suppressed near the water surface.

  The frame resistance suppressor 33 rotates so that the leading edge is disposed in the direction in which the fluid flows when the fluid flow is inclined in, for example, the −Z direction with respect to the X direction. That is, the frame resistance suppressor 33 rotates so that the chord lines thereof are along the direction of the fluid flow.

  It should be noted that the above embodiment is for facilitating the understanding of the present invention, and is not for limiting and interpreting the present invention. The present invention can be changed and improved without departing from the gist thereof. For example, the present invention includes the following.

=== Other Embodiments ===
<<< resistance suppressor (11, 21, 31) >>
In the above description, the resistance suppressors (11, 21, 31) have been described as exhibiting a streamline type or an airfoil shape, but are not limited thereto. For example, it may be rotatably supported by the rotating shaft 100, and a flat plate may be extended from the rotating shaft 100. Further, for example, a triangular shape that is rotatably supported by the rotating shaft 100 and that becomes narrower toward the downstream from the rotating shaft 100 may be used.

  In the above description, the resistance suppressing body (11, 21, 31) is formed, for example, at a break from the vicinity near the joint portion of the arm 110 on the + Y direction side of the rotation shaft 100 to the vicinity near the joint portion of the arm 111 on the −Y direction side. Although it is described that they are provided continuously without being provided, the present invention is not limited to this. For example, a plurality of resistance suppressors (11, 21, 31) may be provided intermittently.

  In FIGS. 1 to 8, the resistance suppressors (11, 21) are illustrated as covering the peripheral surface of the rotating shaft 100 via the bearings (12, 22), but are not limited thereto. For example, as shown in FIGS. 12 and 13, a part of the resistance suppressors 41 and 51 is attached to bearings 42 and 52 provided on the rotating shaft 100, and the blade thickness becomes thinner as the distance from the rotating shaft 100 increases. May be formed symmetrically with respect to the direction of the flow of the fluid passing through the rotating shaft 100. Specifically, the resistance suppressing body 41 shown in FIG. 12 is curved concavely so that the end on the upstream side (−X direction side) is along the peripheral surface of the rotating shaft 100. Further, the resistance suppressing body 51 shown in FIG. 13 has a round end in a convex shape. Each of the resistance suppressors 41 and 51 has an end attached to a bearing 42 or 52 so as to rotate along the direction of fluid flow. The resistance suppressors (41, 51) may be formed asymmetrically with respect to the direction of the flow of the fluid passing through the rotating shaft 100.

<< Bearing (12,22,32) >>
In the above description, the rectifiers (10, 20, 30) have been described as including the bearings (12, 22, 32), but the present invention is not limited to this. For example, the rectifiers (10, 20, 30) may not be provided with the bearings (12, 22, 32), and the resistance suppressors (11, 21, 31) are prevented from moving in the long axis direction, In addition, it is only necessary to be provided rotatably.

<< Frame resistance suppressor 33 >>
In the above description, the frame resistance suppressing body 33 has been described as exhibiting a streamlined shape, but is not limited thereto. For example, a plate-shaped member that is rotatably supported by the frame member 131 and extends from the frame member 131 may be provided. Further, for example, a triangular shape that is rotatably supported by the frame member 131 and that becomes narrower toward the downstream from the frame member 131 may be used.

  In the above description, the frame resistance suppressing body 33 has been described as being provided, for example, continuously without a break across both ends of the frame member 131 in the long axis direction (Y direction), but is not limited thereto. For example, a plurality of frame resistance suppressors 33 may be provided intermittently. In addition, both ends of the frame resistance suppressing body 33 and another frame member different from the frame member 131 on which the frame resistance suppressing body 33 is supported may be provided to be sufficiently separated. . In other words, the frame resistance suppressing body 33 may be provided at the center of the frame member 131 in the Y direction so as to be sufficiently separated from both ends of the frame member 131. The attachment of the bearing 32 is not limited, and it is sufficient that the frame resistance suppressing body 33 is provided so as to be able to suppress movement in the long axis direction and to be rotatable.

=== Summary ===
As described above, the rectifying device (10, 20, 30) according to the present embodiment is configured to include the blade 120 attached to the rotating shaft 100 and rotating the rotating shaft 100 by receiving a fluid flow. In the rotating device 200, the fluid is supported by the rotating shaft 100 and rotates along the flow of the fluid so as to suppress the resistance applied to the rotating shaft 100 due to the fluid flowing from the upstream side of the rotating shaft 100. A movable resistance suppressor (11, 21, 31) is provided. According to the present embodiment, since the turbulence of the flow and the generation of waves near the water surface can be suppressed, the turbulence and the vortex of the flow around the blade 120 are reduced, and the power conversion efficiency is improved.

  In the rectifiers (10, 20, 30) according to the present embodiment, the resistance suppressors (11, 21, 31) are supported by the rotating shaft 100 so as to cover the rotating shaft 100. According to the present embodiment, since the turbulence of the flow in the fluid reaching the rotating shaft 100 and the generation of waves near the vortex water surface can be suppressed, the turbulence and the vortex around the blade 120 are reduced, and the power conversion efficiency is improved. I do.

  In the rectifiers (40, 50) according to the present embodiment, the resistance suppressing bodies (41, 51) are supported by the rotating shaft 100 so as to be adjacent to the rotating shaft 100. According to the present embodiment, since the resistance suppressors (41, 51) can be made smaller in size than the resistance suppressors (11, 21, 31), the manufacturing cost can be reduced.

  Further, in the rectifiers (10, 30) according to the present embodiment, the resistance suppressing bodies 11 are formed symmetrically with respect to the direction of the flow of the fluid passing through the rotating shaft 100. According to the present embodiment, turbulence and eddies in the flow can be efficiently suppressed on the downstream side of the rotating shaft 100. In addition, if the rotating shaft 100 near the water surface is provided with the resistance suppressing body (11, 31), generation of waves can be suppressed.

  Further, in the rectifier 20 according to the present embodiment, the resistance suppressing body 21 includes a rotational friction force transmitted to the resistance suppressing body 21, a lift in a direction opposite to the rotation direction in which the resistance suppressing body 21 receives the fluid, and Are formed asymmetrically with respect to the direction of the flow of the fluid passing through the rotating shaft 100 so that they cancel each other. According to the present embodiment, the resistance suppressor 21 can be arranged along the direction of the flow of the fluid by canceling out the rotational friction force and the lift force, so that the turbulence and the vortex of the flow can be suppressed more efficiently. In addition, generation of waves can be suppressed near the water surface.

  In the rectifier 20 according to the present embodiment, the resistance suppressing body 21 is provided on the first end face in the + Y direction in the direction along the rotation axis 100 so as to suppress the vortex generated from both ends of the resistance suppressing body 21. A first flange portion 21A having a flange shape and a second flange portion 21B having a flange shape provided on a second end surface opposite to the first end surface in the direction along the rotation axis 100 are further provided. According to the present embodiment, the induced resistance due to the wing tip vortex generated at both ends of the resistance suppressing body 21 can be suppressed.

  In the rectifier 20 according to the present embodiment, both ends of the resistance suppressing body 21C in the direction along the rotation axis 100 are formed symmetrically with respect to the direction of the flow of the fluid passing through the rotation axis 100. According to the present embodiment, in order to suppress the induction resistance without generating a wing tip vortex at both ends in the Y direction of the resistance suppressing body 21C, the rotational friction force and the lift cancel each other out at the intermediate portion, so that the flow is efficiently performed. Disturbance and eddies can be suppressed.

  In addition, in (10, 20, 30) according to the present embodiment, the resistance suppressors (11, 21, 31) move from the upstream side to the downstream side of the fluid in a state of being rotated along the direction of the flow of the fluid. The thickness is formed so that the thickness in the direction (Z direction) orthogonal to the direction along the rotation axis 100 and the direction of the flow of the fluid becomes smaller as it goes. According to the present embodiment, turbulence and eddies in the flow can be efficiently suppressed on the downstream side of the rotating shaft 100. In addition, generation of waves can be suppressed near the water surface.

  In the rectifier 30 according to the present embodiment, the frame 130 supporting the rotary shaft 100 and the blades 120 is axially supported by the frame members (131, 132) constituting the frame 130, and is upstream of the frame members (131, 132). And a frame resistance suppressing body that rotates along the flow of the fluid so as to suppress the resistance applied to the frame members (131, 132) due to the fluid flowing from the side. According to the present embodiment, since the turbulence and vortex of the flow generated in the frame 130 can be suppressed, the turbulence and vortex of the flow around the blade 120 are reduced, and the power conversion efficiency of the rotating device is improved.

  Further, in the rectifier 30 according to the present embodiment, the frame resistance suppressing body 33 has a combined force of a buoyancy generated in the frame resistance suppressing body 33 and a lift received by the frame resistance suppressing body 33, and a gravity acting on the frame resistance suppressing body 33. , Are formed asymmetrically with respect to the direction of fluid flow through the frame member 132 so as to cancel each other. According to the present embodiment, it is possible to effectively suppress turbulence in the flow and generation of a vortex that may occur particularly on the downstream side of the horizontally provided frame member 132. In addition, generation of waves can be suppressed near the water surface.

  In the rectifier 30 according to the present embodiment, the frame resistance suppressors 33 are formed symmetrically with respect to the direction of the flow of the fluid passing through the axis of the frame member 132 (X direction). According to the present embodiment, turbulence and eddies in the flow can be efficiently suppressed on the downstream side of the rotating shaft 100. Further, if the frame resistance suppressing body 33 is provided on the frame 130 near the water surface, generation of waves can be suppressed.

  In the rectifying device 30 according to the present embodiment, the frame resistance suppressing body 33 rotates in the direction of the flow of the fluid while the frame members 131 and 132 move from the upstream side to the downstream side of the fluid. It is formed so that the thickness in the direction (Z direction) orthogonal to the direction along the axis (Y direction) and the direction of fluid flow (X direction) is reduced. According to the present embodiment, turbulence and eddies in the flow can be efficiently suppressed downstream of the frame members 131 and 132. In addition, generation of waves can be suppressed near the water surface.

  Also, in the rectifier (10, 20, 30, 40, 50) according to the present embodiment, the resistance is controlled so that the resistance suppressors (11, 21, 31, 41, 51) rotate along the flow of the fluid. A bearing (12, 22, 32, 42, 52) provided between the suppressing body (11, 21, 31, 41, 51) and the rotating shaft 100 is further provided. According to the present embodiment, the resistance suppressors (11, 21, 31, 41, 51) can smoothly rotate in accordance with the direction of the flow of the fluid.

  In the rectifier (10, 20, 30, 40, 50) according to the present embodiment, the fluid is wind, and the rotating shaft 100 is connected to a turbine of a wind power generator. According to the present embodiment, turbulence and eddies in the flow can be suppressed in the wind power generator.

  In the rectifier (10, 20, 30, 40, 50) according to the present embodiment, the fluid is water, and the rotating shaft 100 is connected to a turbine of a hydroelectric generator such as a tidal current generator. According to the present embodiment, turbulence and eddy of the flow can be suppressed in the hydroelectric generator. In addition, generation of waves can be suppressed near the water surface.

10, 20, 30, 40, 50 Rectifiers 11, 21, 31, 41, 51 Resistance suppressors 12, 22, 32, 42, 52 Bearing 21A First flange 21B Second flange 21C Resistance suppressor 33 Frame resistance Suppressor 100 Rotating shaft 120 Blade 130 Frame 131, 132 Frame member 200 Rotating device

Claims (12)

In a rotating device attached to a rotating shaft and including a blade that receives the flow of fluid and rotates the rotating shaft,
To cover the rotating shaft or be adjacent to the rotating shaft, the shaft is supported by the rotating shaft, and due to the fluid flowing from the upstream side of the rotating shaft, a resistance given to the rotating shaft is reduced. To suppress, comprising a resistance suppressor that rotates along the flow of the fluid ,
In a state where the resistance suppressor is rotated along the direction of the flow of the fluid, as the fluid moves from the upstream side to the downstream side of the fluid, in the direction along the rotation axis and the direction of the fluid flow, A rectifier, wherein the rectifier is formed so as to have a reduced thickness in a direction orthogonal to the rectifier. The rectifier according to claim 1, wherein the resistance suppressing body is formed symmetrically with respect to a direction of a flow of the fluid passing through the rotation axis. The resistance suppressor has a frictional force in a rotation direction of the rotation shaft transmitted from the rotation axis to the resistance suppression body, and a lift in a direction opposite to the rotation direction received by the resistance suppression body from the fluid. The rectifying device according to claim 1, wherein the rectifying device is formed asymmetrically with respect to a direction of the flow of the fluid passing through the rotation axis so as to cancel each other. The resistance suppressor suppresses a vortex given to the resistance suppressor,
A first flange portion having a flange shape provided on a first end surface in a direction along the rotation axis;
A second flange portion having a flange shape provided on a second end surface opposite to the first end surface in a direction along the rotation axis;
The rectifier according to claim 3 , further comprising: The rectifier according to claim 3 , wherein both ends of the resistance suppressing body in a direction along the rotation axis are formed symmetrically with respect to a direction of a flow of the fluid passing through the rotation axis. In the frame that supports the rotating shaft and the blade, the frame member is supported by a frame member that constitutes the frame, and suppresses a resistance applied to the frame member due to the fluid flowing from an upstream side of the frame member. A frame resistance suppressor that rotates along the flow of the fluid;
The rectifier according to any one of claims 1 to 5 , further comprising: The frame supports the rotating shaft and the blade in water,
The frame resistance suppressor pivotally supported by the frame member provided along the water surface among the frame members constituting the frame has a buoyancy generated in the frame resistance suppressor and a lift force received by the frame resistance suppressor. force and a gravitational force exerted on the frame resistance suppressing body, so cancel out, according to claim 6, characterized in that it is formed asymmetrically in the direction of flow of the fluid passing through the axis of the frame member as a boundary Rectifier. The rectifier according to claim 6 , wherein the frame resistance suppressing body is formed symmetrically with respect to a direction of the flow of the fluid passing through an axis of the frame member. In the state where the frame resistance suppressor is rotated along the direction of the flow of the fluid, the direction along the axis of the frame member and the direction of the flow of the fluid as going from the upstream side of the fluid to the downstream side. The rectifier according to claim 8 , wherein the rectifier is formed so as to have a reduced thickness in a direction perpendicular to the rectifier. As the resistance suppressing body rotates along the flow of the fluid, a bearing provided between the resistance suppressing body and the rotating shaft,
The rectifier according to any one of claims 1 to 9 , further comprising: The fluid is wind;
The rectifier according to any one of claims 1 to 6 , wherein the rotating shaft is connected to a turbine of a wind power generator. The fluid is water;
The rectifier according to any one of claims 1 to 10 , wherein the rotating shaft is connected to a turbine of a hydroelectric generator.

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