JP6634738B2 - Power generator - Google Patents

Description

  The present invention relates to a power generation device in which a plurality of turbine units are connected by a connection structure.

  As such a power generation device, there is known an ocean current power generation device configured to use a plurality of downwind type turbines and to connect these turbines upstream of the turbine. For example, in the devices described in Patent Literatures 1 and 2, two or more pods having a rotor are provided, and these pods are connected by a structure such as a transverse structure wing or a connecting member. The pod and the pod are each provided with two or more blades. When a downwind turbine is used, at least two blades are arranged downstream of the structure.

JP 2014-534375 A JP 2015-21416 A

  When seawater (fluid) passes around the structure, the flow velocity may decrease in a region downstream of the structure. In a configuration in which a plurality of turbines are connected by a structure located on the upstream side, when the turbine blades pass through a region where the flow velocity has decreased, the load applied to the turbine blades varies. When the load applied to the turbine blade fluctuates, for example, the power generation amount may fluctuate or the fatigue life of the structural material may be shortened. Conventionally, measures against these problems have been taken, such as increasing the distance between the structure and the turbine, or shifting the position of the structure from the passage area of the turbine blade. However, no solution has been proposed for reducing the flow velocity in the area downstream of the structure.

  The present invention provides a power generation device capable of suppressing a decrease in flow velocity in a region on the downstream side of a structure in a configuration in which a downwind type turbine unit is connected by a structure.

A power generator according to one aspect of the present invention includes a plurality of turbine blades, each including a plurality of turbine blades, and a plurality of downwind-type turbine units arranged in a transverse direction that are spaced apart in a transverse direction that intersects the rotation axis of the turbine blades. A connecting structure extending along and connecting the plurality of turbine sections, and a flow rate attached to an end of the connecting structure on the turbine blade side in the rotation axis direction, which suppresses a decrease in a flow rate of a fluid passing through the connecting structure. The flow velocity reduction suppressing part is formed in a corrugated shape in which peaks and valleys are repeated in the transverse direction, and obliquely downwards with respect to the rotation axis on the turbine blade side of the connection structure. Flow in the fluid and a flow obliquely upward with respect to the rotation axis is generated in the fluid.

  According to this power generation device, the plurality of downwind-type turbine units generate power by the flow of the fluid. A flow velocity reduction suppressing section is provided on the turbine blade side of the connection structure connecting the turbine sections, that is, on the downstream end with respect to the fluid flow. Since the fluid flows obliquely downward and obliquely upward by the flow velocity reduction suppressing portion, the up and down flows are mixed, and a decrease in the flow velocity in the downstream region of the connection structure is suppressed. As a result, the area where the flow velocity decreases on the downstream side of the connecting structure is reduced.

  In some aspects, the flow velocity reduction suppressing section includes a first guide section that guides the fluid obliquely downward and a second guide section that guides the fluid obliquely upward. Since the flow velocity reduction suppressing portion includes the first guide portion and the second guide portion, the above-described obliquely downward flow and the obliquely upward flow can be reliably and easily generated in the fluid.

  In some aspects, the first guide portion includes a pair of first side plate portions and an inclined bottom portion connecting lower portions of the pair of first side plate portions, and the second guide portion includes a pair of second side plate portions. And an inclined top connecting the upper portions of the pair of second side plate portions. In this case, the fluid is guided obliquely downward along the inclined bottom while being surrounded by the first side plate. On the other hand, the fluid is guided obliquely upward along the inclined top while being surrounded by the second side plate portion. Therefore, it is possible to efficiently generate a flow toward the turbine blade while preventing the fluid from flowing in the transverse direction.

  In some aspects, the first guides and the second guides are provided alternately in the transverse direction. In this case, an obliquely downward flow and an obliquely upward flow occur alternately in the transverse direction. Therefore, the flow of the fluid is more effectively mixed, and the effect of suppressing the decrease in the flow velocity is enhanced.

  According to some aspects of the invention, a decrease in flow velocity is suppressed in a region on the downstream side of the connecting structure, and as a result, a region in which the flow velocity decreases on the downstream side of the connecting structure is reduced.

1 is a perspective view illustrating a power generation system to which a power generation device according to one embodiment of the present invention is applied. FIG. 2 is a perspective view showing the power generator in FIG. 1. FIG. 3A is a perspective view illustrating a connecting structure and a flow velocity reduction suppressing section in FIG. 2, and FIG. 3B is a cross-sectional view of the flow velocity reduction suppressing section cut along a transverse direction. It is sectional drawing which cut | disconnected the connection structure and the flow velocity reduction suppression part along the rotation axis direction. (A) is a figure which shows the flow velocity distribution formed around the power generation device of FIG. 2, (b) is a figure which shows the flow velocity distribution formed around the power generation apparatus which concerns on a comparative example. FIG. 4 is a diagram illustrating a change in load applied to a turbine blade with respect to a change in phase of the turbine blade. (A)-(c) is sectional drawing which shows the deformation form of the flow velocity fall suppression part, respectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. In the following embodiment, a case where the present invention is applied to a marine power generation device will be described. However, the present invention is not limited to the following embodiments, and the present invention can be applied to a tidal current power generation device that generates electric power using a tidal current, and can be applied to a wind power generation device that generates electric power using an air flow (wind). It can also be applied.

  With reference to FIG. 1 and FIG. 2, an ocean current power generation device 1 of the present embodiment and an ocean current power generation system S to which the ocean current power generation device 1 is applied will be described. As shown in FIG. 1, the ocean current power generation system S includes an ocean current power generation device 1 that floats in seawater and generates electric power using the ocean current. In the ocean current power generation device 1, the flow of sea water (fluid), that is, the ocean current is an energy source for generating electric power. The ocean current power generation device 1 includes a pair of left and right turbine units 4 and a connection beam (connection structure) 3 that connects these turbine units 4. Each turbine unit 4 includes a cylindrical pod 2 that rotatably supports a turbine rotor 4 a (see FIG. 2) and receives a load acting on the turbine unit 4. Each pod 2 contains a support structure for supporting the turbine rotor 4 a, devices (for example, a generator) related to power generation in the turbine unit 4, and a control device for controlling the floating and sinking of the pod 2.

  The ocean current generator 1 is connected via a mooring line 10 to a sinker or anchor 14 (in the illustrated example, a sinker) for fixing to the sea floor. The mooring line 10 includes a lower mooring line 11c connected to the sinker 14 and an upper mooring line 11a, 11b that branches into two from the upper end of the lower mooring line 11c and is connected to the connecting beam 3 of the ocean current power generator 1. Including. The distal ends of the upper mooring lines 11a, 11b branched in a Y-shape in this manner are connected to two connection points 12a, 12b on the left and right of the connection beam 3. The form of the mooring line 10 is not limited to this, and may be connected to the connecting beam 3 at one point, or two upper mooring lines 11a, 11b are connected to the left and right pods 2, 2. You may.

  Although not shown, a power transmission cable for transmitting the power generated in the turbine unit 4 is provided along the mooring line 10. One end of the power transmission cable is connected to a generator in the pods 2 and 2, and the other end of the power transmission cable is connected to, for example, a repeater (or a transformer) provided in the sinker 14. Further, the ocean current power generation system S includes a power transmission cable laid on the sea floor and extending to the ground. The ocean current power generation system S is configured to transmit the power generated in the turbine unit 4 to the ground via these power transmission cables.

  In the ocean current power generation device 1, a downwind type turbine unit 4 is used. The turbine unit 4 floats in a position in which the pod 2 of the turbine unit 4 faces the direction of the ocean current F (see FIG. 5A). In this floating state, the rotation axes La and Lb of the turbine units 4 and 4 are maintained substantially horizontal. The turbine unit 4 generates power by rotating the turbine rotor 4a while maintaining this floating state.

  As shown in FIGS. 1 and 2, the turbine rotor 4 a of each turbine unit 4 includes a plurality of turbine blades 6. The turbine blade 6 is fixed to a hub projecting rearward from a rear end 2 c of the pod 2. In each turbine section 4, for example, two turbine blades 6 are provided. In the downwind type turbine unit 4, the turbine blades 6 are arranged on the downstream side of the pod 2 based on the direction of the ocean current F. In this specification, “downstream” and “upstream” are based on the direction of the ocean current F.

  In one turbine section 4 and the other turbine section 4, the pitch of the turbine blades 6 is reversed. The pair of turbine units 4 receive the ocean current F and rotate in opposite directions. Thereby, the rotational torque generated in each turbine unit 4 is canceled, and the posture of the marine power generation device 1 is stabilized. The number of turbine blades 6 is not limited to two, and may be three or more.

  The pair of turbine portions 4 and 4 are spaced apart in a transverse direction perpendicular to the rotation axes La and Lb of the turbine rotor 4a. The connecting beam 3 extends along the transverse direction, and connects the turbine parts 4 and 4 via the pods 2 and 2. More specifically, the connection beam 3 has a flat rectangular parallelepiped shape extending in the transverse direction, and is provided on a plane including the rotation axes La and Lb parallel to each other. That is, both left and right ends of the connection beam 3 are connected and fixed to the vertical center of the cylindrical main body 2 a of the pod 2.

  The connection beam 3 will be described in more detail with reference to FIGS. The connection beam 3 includes a flat upper surface 3a, a flat lower surface 3b provided in parallel with the upper surface 3a, and a front end 3c connecting front ends of the upper surface 3a and the lower surface 3b. A flat upper inclined surface 3e is provided behind the upper surface 3a, that is, downstream. A flat lower inclined surface 3f is provided behind the lower surface 3b, that is, downstream. The upper inclined surface 3e and the lower inclined surface 3f are inclined so as to be closer to each other as going backward. The rear end of the upper inclined surface 3e and the rear end of the lower inclined surface 3f are connected to form a rear end 3d extending horizontally in the left-right direction.

  As shown in FIG. 2, the vertical thickness (the distance between the upper surface 3 a and the lower surface 3 b) of the connecting beam 3 is within the range of the thickness (that is, the diameter) of the main body 2 a of the pod 2. Further, the front end 3c of the connecting beam 3 is disposed behind the front end 2b of the pod 2. The rear end 3d of the connection beam 3 is arranged on the front side of the rear end 2c of the pod 2. Thus, the connecting beam 3 is arranged so as to be included in the area of the pod 2 when viewed from the transverse direction. In the downwind type turbine unit 4, each turbine blade 6 extending in the radial direction around the rotation axes La and Lb passes once downstream of the connection beam 3 during one rotation.

  As shown in FIG. 3A, a rear end 3 d (an end on the turbine blade 6 side) of the connection beam 3 is provided with a flow rate reduction suppression unit 20 for suppressing a reduction in the flow rate of seawater passing through the connection beam 3. Has been fixed. The flow velocity reduction suppressing section 20 extends along the transverse direction. The flow velocity reduction suppressing portion 20 is provided over a predetermined length in the front-rear direction (the direction of the rotation axis La, Lb) from the rear end 3d of the connecting beam 3, that is, a central portion in the front-rear direction or a slightly rearward portion of the main body 2a. Have been. The flow velocity reduction suppressing portion 20 does not protrude rearward from the rear end 2c of the pod 2, and terminates forward of the rear end 2c.

  With reference to FIGS. 3 and 4, the flow velocity reduction suppressing section 20 will be described in more detail. The flow velocity reduction suppressing unit 20 is formed in a corrugated shape in which peaks and valleys are repeated in the transverse direction. The flow velocity reduction suppressing section 20 may have a sine wave shape, for example. The thickness in the vertical direction of the front end of the flow velocity reduction suppressing section 20 is relatively small (thin), and the thickness in the vertical direction increases (thickens) toward the rear end of the flow velocity reduction suppressing section 20. I have. As shown in FIG. 3B, in the corrugated plate-shaped flow velocity reduction suppressing section 20, the above “thickness” corresponds to the “amplitude” of the waveform.

  More specifically, the flow velocity reduction suppressing unit 20 causes the seawater to generate a flow obliquely downward with respect to the rotation axes La and Lb, and generate a flow obliquely upward with respect to the rotation axes La and Lb in the seawater. It is configured. The flow velocity reduction suppressing section 20 includes a first guide section 21 that guides seawater diagonally downward and a second guide section 22 that guides seawater diagonally upward. The first guide portion 21 corresponds to the above-described valley portion, and the second guide portion 22 corresponds to the above-mentioned peak portion.

  As shown in FIG. 3B, the first guide portions 21 and the second guide portions 22 are provided alternately in the transverse direction. The first guide portion 21 includes a pair of first side plate portions 21a, 21a forming slopes of valley portions, and an inclined bottom portion 21b connecting lower portions of the first side plate portions 21a, 21a. The second guide portion 22 includes a pair of second side plate portions 22a, 22a forming a slope of a mountain portion, and an inclined top portion 22b connecting upper portions of the second side plate portions 22a, 22a. The first side plate portion 21a of the first guide portion 21 and the second side plate portion 22a of the second guide portion 22 are smoothly continuous.

  As shown in FIG. 4, the inclined bottom portion 21 b of the first guide portion 21 is inclined downward, and is continuous with the upper inclined surface 3 e of the connecting beam 3. The inclination angle of the upper inclined surface 3e with respect to the horizontal plane (the plane including the rotation axis lines La and Lb) may be equal to the inclined angle of the inclined bottom portion 21b. That is, the inclined surface 21c, which is the upper surface of the inclined bottom portion 21b, and the upper inclined surface 3e of the connection beam 3 may be smoothly continuous. In addition, these inclination angles may be different, and there may be some steps between the inclined surface 21c and the upper inclined surface 3e. The rear end portion 21d of the inclined bottom portion 21b is located at the lowest position in the flow velocity reduction suppressing portion 20. The rear end 21d may be at a position higher than the lower surface 3b of the connection beam 3 (see FIG. 3B), or may be at a position similar to the lower surface 3b. The rear end 21d may protrude below the lower surface 3b.

  On the other hand, the inclined top portion 22b of the second guide portion 22 is inclined upward and is continuous with the lower inclined surface 3f of the connecting beam 3. The inclination angle of the lower inclined surface 3f with respect to the horizontal plane (the plane including the rotation axis lines La and Lb) may be equal to the inclination angle of the inclined top 22b. That is, the inclined surface 22c, which is the lower surface of the inclined top 22b, and the lower inclined surface 3f of the connection beam 3 may be smoothly continuous. In addition, these inclination angles may be different, and there may be some steps between the inclined surface 22c and the lower inclined surface 3f. The rear end 22d of the inclined top 22b is located at the highest position in the flow velocity reduction suppressing section 20. The rear end 22d may be at a position lower than the upper surface 3a of the connection beam 3 (see FIG. 3B), or may be at a position similar to the upper surface 3a. Note that the rear end portion 22d may protrude above the upper surface 3a.

  The height of the flow velocity reduction suppressing section 20 may be about ２〜 to ／ of the height of the connection beam 3. Here, the height is a length in a direction perpendicular to a plane including the rotation axes La and Lb, that is, a direction perpendicular to the rotation axes La and Lb and the transverse direction of the connection beam 3. The left end portion 20a (see FIG. 3A) of the flow velocity reduction suppressing section 20 is fixed to the left pod 2, for example. The right end 20b (see FIG. 3A) of the flow velocity reduction suppressing section 20 is fixed to, for example, the right pod 2. Note that the left end portion 20a and the right end portion 20b of the flow velocity reduction suppressing section 20 may be separated from the pod 2.

  The flow velocity reduction suppressing unit 20 is formed, for example, plane-symmetrically with respect to a plane including the rotation axes La and Lb (a plane that vertically divides the connection beam 3 into two parts; a horizontal plane). Further, the flow velocity reduction suppressing section 20 is formed to be plane-symmetric with respect to a plane that vertically divides the rotation axis La and Lb into two equal parts (a plane that divides the connecting beam 3 into two right and left sides; a vertical plane).

  According to the flow velocity reduction suppressing unit 20 having the above configuration, as shown in FIG. 4, an obliquely downward flow D1 is formed by the first guide unit 21 with respect to the seawater that has passed through the upper surface 3a of the connection beam 3. . At the same time, the second guide portion 22 forms an obliquely upward flow D2 for the seawater that has passed through the lower surface 3b of the connection beam 3. Thus, the flows of the connecting beams 3 from the upper surface 3a and the lower surface 3b are formed alternately at the same height.

  FIG. 5A shows a state in which the ocean current power generation device 1 floats opposite to the ocean current F and performs power generation by the turbine unit 4. FIG. 5A illustrates the flow velocity of the ocean current F in a plane including the rotation axes La and Lb (a plane that vertically divides the connection beam 3 into two parts; a horizontal plane). The darker the area, the smaller the flow velocity. The ocean current F impinges on the turbine blade 6 after passing through the connecting beam 3 and the pod 2. The seawater that has passed through the turbine blade 6 works on the turbine blade 6 and then flows downstream. Thus, the turbine unit 4 generates power using the ocean current F.

  As shown in FIG. 5A, a first flow velocity reduction region A1 having a low flow velocity is formed downstream of the turbine blade 6. On the downstream side of the pod 2, a second flow velocity reduction area A2 having a lower flow velocity is formed. Although FIG. 5A shows a flow velocity distribution on a horizontal plane, actually, the first flow velocity reduction area A1 and the second flow velocity reduction area A2 are rotated about the rotation axes La and Lb. A three-dimensional flow velocity reduction region is formed in the sea.

  According to the marine power generation device 1 of the present embodiment, the flow velocity reduction suppression unit 20 is provided on the turbine blade 6 side of the connection beam 3 connecting the turbine unit 4, that is, on the downstream rear end 3 d. Since the seawater flows obliquely downward and obliquely upward by the flow velocity reduction suppressing section 20, the vertical flow is mixed, and the decrease in the flow velocity in the downstream region of the connection beam 3 is suppressed (see FIG. 5A). ).

  FIG. 5B shows, as a comparative example, a flow velocity distribution of the ocean current F in the case where the ocean current power generation device 100 without the flow velocity reduction suppressing unit 20 is used. As shown in FIG. 5B, the flow velocity is reduced in a region on the downstream side of the connection beam 3, and a third flow velocity reduction region A <b> 3 is formed between the connection beam 3 and the turbine blade 6. . This is because the ocean current F that has passed through the connection beam 3 forms a vortex immediately after the connection beam 3 and separation of the flow occurs. In such a situation, when the turbine blades 6 pass through the region where the flow velocity of the ocean current F is reduced, the load applied to the turbine blades 6 varies. For example, as shown by a broken line in FIG. 6, when one turbine blade 6 passes through the downstream side of the connection beam 3 at 90 degrees, and when the other turbine blade 6 passes through the downstream side of the connection beam 3 at 270 degrees. At the time, the load is temporarily reduced. When the load applied to the turbine blade 6 fluctuates in this way, for example, the power generation amount may fluctuate or the fatigue life of the structural material may be shortened.

  On the other hand, according to the ocean current power generation device 1, the region where the flow velocity decreases on the downstream side of the connection beam 3 is reduced. In the ocean current power generation device 1 in which the formation of the third flow velocity reduction region A3 is suppressed, the load applied to the turbine blade 6 can be made substantially constant during one rotation of the turbine blade 6 as shown by a solid line in FIG.

  According to the ocean current power generator 1, the fluctuating load acting on the turbine blade 6 is reduced, and the following effects are obtained. First, the fluctuation of the power generation output is reduced, the power supply is stabilized, and the load on the transmission and substation system is reduced. Next, a decrease in the low-speed range suppresses a decrease in the operation rate and increases the power generation amount. Further, the fluctuation of the load applied to the turbine blade 6 is reduced, and the fatigue life can be extended. Further, the distance for separating the turbine blade 6 from the connecting beam 3 can be shortened, so that the degree of freedom in design is increased.

  Since the flow velocity reduction suppressing section 20 includes the first guide section 21 and the second guide section 22, it is possible to reliably and easily generate the obliquely downward flow D1 and the obliquely upward flow D2 in the seawater.

  The ocean current F is guided obliquely downward along the inclined bottom portion 21b while being surrounded by the first side plate portion 21a. On the other hand, the ocean current F is guided obliquely upward along the inclined top 22b while being surrounded by the second side plate 22a. Therefore, the ocean current F is prevented from flowing in the transverse direction, and the ocean current F efficiently flows toward the turbine blade 6.

  Further, according to the corrugated plate-shaped flow velocity reduction suppressing section 20, the obliquely downward flow D1 and the obliquely upward flow D2 are alternately generated in the transverse direction. Therefore, the ocean current F is more effectively mixed, and the effect of suppressing a decrease in the flow velocity is enhanced.

  The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, the flow velocity reduction suppressing section 20 is not limited to the above-described embodiment.

  Various forms may be employed in which the plate-like rear end extending from the upper and lower slopes of the connecting beam 3 alternately goes up and down like a side-by-side plate. As shown in FIGS. 7A to 7C, a plurality of types of patterns that move up and down can be considered. As shown in FIG. 7A, the first guide portion 31 includes a first side plate portion 31a that is closer to a flat surface and an inclined bottom portion 31b, a second side plate portion 32a that is closer to a flat surface, and an inclined top portion 32b. The flow velocity reduction suppressing section 30 including the second guide section 32 composed of As shown in FIG. 7B, a first guide portion 41 including a planar first side plate portion 41a and a semicircular inclined bottom portion 41b, a planar second side plate portion 42a, and a semicircular shape. The flow velocity reduction suppressing section 40 may include the second guide section 42 including the inclined top section 42b. As shown in FIG. 7 (c), a first guide portion 51 comprising a planar first side plate portion 51a and a pointed inclined bottom portion 51b, and a planar second side plate portion 52a, It may be a triangular wave-shaped flow velocity reduction suppressing section 50 including a second guide section 52 having an inclined top section 52b having a bent shape.

  The present invention is not limited to the case where the ocean current power generation device 1 is provided with the pair of turbine units 4. Three or four or more turbine units 4 may be provided. In that case, it is possible to adopt a configuration in which the adjacent turbine units 4 and 4 are connected by the connection beam 3 (connection structure). It is not necessary for the plurality of connecting beams 3 to be on the same plane. The adjacent connecting beams 3 may form an obtuse angle.

  The shape of the connection beam 3 is not limited to the shape described above. The upper inclined surface 3e and the lower inclined surface 3f are not limited to being flat, but may be curved. The upper inclined surface 3e and the lower inclined surface 3f may not be provided. That is, the rear end of the connection beam 3 may have a rounded shape connecting the upper surface 3a and the lower surface 3b, or may have a flat surface extending in the vertical direction. The transverse direction in which the connecting beam 3 extends is not limited to the direction orthogonal to the rotation axes La and Lb, and may be a direction other than 90 degrees with respect to the rotation axes La and Lb. The connecting beam 3 is not limited to the case where the connecting beam extends only in one direction, and may protrude between the turbine sections 4 and 4 on one side or the other side of a plane including the rotation axes La and Lb. In this case, the connection beam 3 may include a bent portion or a curved portion.

  The positional relationship between the connecting beam 3 and the pod 2 (turbine unit 4) is not limited to the above-described embodiment, and various other embodiments may be employed. For example, the connecting beam 3 is not limited to being connected to the center of the pod 2 (turbine unit 4) in the vertical direction, and may be connected to the upper or lower part of the pod 2 (turbine unit 4). The present invention is not limited to the case where both ends of the connection beam 3 are connected to the pod 2 (turbine unit 4), and an intermediate portion (a part other than both ends) of the connection beam 3 may be connected to the pod 2 (turbine unit 4). . That is, both ends of the connection beam 3 may protrude in the transverse direction from the pod 2 (turbine unit 4).

  In the case of a wind power generator using the flow of the atmosphere, that is, wind power, as the fluid of the energy source, a plurality of turbine units (for example, nacelles) are connected by a connecting structure, and an integrated power generator is provided. , And a form that can be suspended in the atmosphere.

  Even in the case of including a turbine unit in which an upwind type turbine blade is combined in addition to the downwind type turbine blade 6, the present invention can be included in the scope of the present invention. As long as the generator comprises a connection structure located upstream of at least one turbine blade, such a generator may fall within the scope of the present invention.

  When the present invention is applied to the ocean current power generation device, a buoyancy body portion for adjusting buoyancy may be provided in a structure portion connecting the turbine portions.

1 Ocean current power generator (power generator)
2 Pod 3 Connecting beam (connecting structure)
3d rear end (end on turbine blade 6 side)
4 Turbine part 6 Turbine blade 20 Flow velocity decrease suppressing part 21 First guide part 21a First side plate part 21b Inclined bottom part 21c Inclined surface 22 Second guide part 22a Second side plate part 22b Inclined top part 22c Inclined surface 30, 40, 50 Flow velocity decrease Suppressors 31, 41, 51 First guides 32, 42, 52 Second guides 31a, 41a, 51a First side plates 31b, 41b, 51b Inclined bottoms 32a, 42a, 52a Second side plates 32b, 42b, 52b Slope top La, Lb Rotation axis

Claims (4)

A plurality of downwind-type turbine sections each including a plurality of turbine blades, and disposed in a transverse direction so as to intersect with the rotation axis of the turbine blades;
A connecting structure extending along the transverse direction and connecting the plurality of turbine units;
A flow velocity reduction suppression unit attached to an end of the connection structure on the turbine blade side in the rotation axis direction, which suppresses a decrease in flow velocity of a fluid passing through the connection structure,
The flow velocity reduction suppressing section is formed in a corrugated shape in which peaks and valleys are repeated in the transverse direction, and on the turbine blade side of the connection structure, flows obliquely downward with respect to the rotation axis. A power generating device that causes the fluid to generate a flow obliquely upward with respect to the rotation axis while causing the fluid to flow. The flow velocity decrease suppression unit,
A first guide portion for guiding the fluid obliquely downward;
The power generator according to claim 1, further comprising: a second guide portion that guides the fluid obliquely upward. The first guide portion includes a pair of first side plate portions and an inclined bottom portion connecting lower portions of the pair of first side plate portions,
The power generator according to claim 2, wherein the second guide portion includes a pair of second side plate portions and an inclined top portion that connects upper portions of the pair of second side plate portions.   The power generator according to claim 2 or 3, wherein the first guide portion and the second guide portion are provided alternately in the transverse direction.

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