Floating body type water turbine device and floating body type tidal power generation facility

Abstract

To provide a floating body type water turbine device capable of efficiently regenerating surface layer tidal current energy, and to provide a floating body type tidal power generation facility.SOLUTION: The specific energy of a passing fluid is enhanced by installing an open type undershot water turbine 13 with a water channel 12 between two bodies arranged in parallel and constituting a floating body 11 of a catamaran structure, and making a water channel structure having a flow expanding part 12B at a downstream side in which a water channel side wall of water turbine back flow is widened in a flow direction and / or a water channel floor face 12c is inclined. The floating body 11 of the catamaran structure is moored to a mooring anchor 32 fixed to the ocean bottom via one mooring rope 30C so that the flow expanding part 12B side of the water channel 12 automatically becomes a downstream side relative to a tidal current. Furthermore, the open type undershot water turbine 13 is installed in the floating body 11 of the catamaran structure by a floating type water turbine loaded mechanism 20 so as to follow a water channel surface shape which greatly fluctuates by an attack flow speed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a floating water turbine device capable of efficiently regenerating surface tidal energy, and a floating tidal power generation facility. [Background technology]

[0002] In recent years, efforts have been made to put marine renewable energy into practical use as an important initiative for promoting the expansion of renewable energy use and the reduction of energy-related CO2 emissions, thereby strengthening measures against global warming.

[0003] Among these, tidal power generation is expected to become widespread because, unlike solar and wind power generation, tidal power generation is a power generation method that can generate stable electricity throughout the year by using tidal force with a certain regularity. Various proposals have been made for this type of power generation, such as fixed tidal power generation equipment in which the water turbines and generators are installed underwater (see, for example, Patent Document 1) and floating tidal power generation equipment (see, for example, Patent Document 2).

[0004] Furthermore, floating hydroelectric power generation facilities have been proposed in which a water turbine and a generator for generating electricity are provided on a floating body (see, for example, Patent Documents 3 and 4). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-210237 [Patent Document 2] JP 2005-351201 A [Patent Document 3] Japanese Patent Application Publication No. 7-301171 [Patent Document 4] JP 2007-9830 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, as disclosed in the above-mentioned cited documents 1 and 2, fixed and floating tidal power generation equipment are installed in the sea, so if the generator or other equipment breaks down, it is difficult to repair and the repair costs are high.

[0007] In addition, in the floating hydroelectric power generation facilities disclosed in the above cited documents 3 and 4, a water turbine and generator for generating electricity are mounted on a catamaran-type float, so that if the generator or other parts break down, they can be easily repaired. However, since the catamaran-type float is maintained in a fixed position by being moored to a quay, there is a problem that the power generation efficiency decreases if there is a change in the direction of the water current, and there has been a demand for improving the power generation efficiency.

[0008] In order to efficiently recover surface tidal energy, it is necessary to improve the structure of the catamaran-type floating body on which the power-generating turbines are mounted, to combine a structure that can follow the current diversion with a waterway structure that efficiently guides the current into the waterway on the turbine side.

[0009] In view of the above-mentioned conventional situation, an object of the present invention is to provide a floating water turbine device and a floating tidal power generation facility that can efficiently regenerate surface tidal energy.

[0010] Further objects of the present invention and specific advantages obtained by the present invention will become more apparent from the following description of the embodiments with reference to the drawings. [Means for solving the problem]

[0011] In the present invention, an open-type undershot water turbine is installed in a waterway between two juxtaposed bodies constituting a catamaran-structure float, and the side wall of the waterway downstream of the turbine is widened in the flow direction and / or the floor is inclined to form a waterway structure having a widened section on the downstream side, thereby increasing the specific energy of the passing fluid. In addition, this catamaran-structure float is moored to a mooring anchor fixed to the seabed via a single mooring rope that is collected by a swivel and is drawn from a float-side attachment point located between the float's center of gravity and the waterwheel rotation axis. This automatically makes the widened section of the waterway downstream side relative to the tidal current. Therefore, the widened section of the waterway automatically becomes downstream relative to the tidal current, and the specific energy increase effect can be maintained at all times. Furthermore, the open-type undershot water turbine is installed on the catamaran-structure float by a float-type waterwheel mounting mechanism in order to follow the waterway surface shape that changes significantly depending on the incoming flow speed.

[0012] In other words, the present invention is a floating water turbine device comprising a catamaran-structured float having two juxtaposed fuselage, a waterway between the two juxtaposed fuselage and having a widening section on the downstream side, and an open-type undershot water turbine provided on the upstream side of the waterway, and the catamaran-structured float is moored to a mooring anchor fixed to the seabed via a single mooring line that is formed by collecting left and right mooring lines drawn from a float-side attachment point located halfway between the float's center of gravity and the rotation axis of the open-type undershot water turbine using a swivel.

[0013] In the floating water turbine device of the present invention, the expansion section of the waterway can be configured so that the expansion of the waterway side wall and / or the inclination of the waterway floor begins from a position approximately 1 / 3 of the way upstream of the total length of the waterway.

[0014] In addition, in the floating water turbine device according to the present invention, the left and right mooring ropes can be pulled out from a position approximately 1 / 3 of the way from the leading edge of the catamaran-structured float.

[0015] In addition, in the floating water turbine device of the present invention, the open type undershot water turbine can be installed on the upstream side of the waterway using a float-type water turbine mounting mechanism that automatically follows the water level that changes depending on the passing flow speed.

[0016] In addition, in the floating water turbine device of the present invention, the float-type water turbine mounting mechanism can comprise a float that constitutes the water channel side wall at the front edge of the water channel, a bearing portion supported by the float that rotatably supports the rotating shaft of the open type undershot water turbine, and a buoyancy adjustment means for adjusting the buoyancy of the float.

[0017] In addition, in the floating water turbine device of the present invention, the buoyancy adjustment means includes a rocking lever that is freely rockably mounted on the floating body, the float is attached to one end of the rocking lever, a weight is attached to the other end of the rocking lever, and the bearing portion is provided on one end side of the rocking lever, so that with the bearing portion supported by the float, the buoyancy of the float can be adjusted by balancing with the weight via the rocking lever.

[0018] In the floating water turbine device according to the present invention, the buoyancy adjustment means may adjust the buoyancy of the float with ballast water.

[0019] Furthermore, the floating water turbine device according to the present invention can utilize the head difference to lower the lower limit flow velocity for starting by installing the open undershot water turbine near the leading edge of the waterway.

[0020] The present invention is a floating tidal power generation facility comprising any one of the floating water turbine devices described above and a generator driven by the rotation of an open undershot water turbine provided on the floating water turbine device. Effect of the Invention

[0021] As described above, the open-type undershot turbine is installed in the waterway between the two juxtaposed bodies that constitute the catamaran-structure float, and the side wall of the waterway downstream of the turbine is widened in the flow direction and / or the floor is inclined to form a waterway structure with a widened section on the downstream side, thereby increasing the specific energy of the passing fluid. This catamaran-structure float is moored to a mooring anchor fixed to the seabed via a single mooring rope that is collected by a swivel and drawn from the float-side attachment point located between the float's center of gravity and the turbine's rotating shaft, so that the widened section of the waterway automatically becomes downstream with respect to the tidal current, and the specific energy can always be increased. Furthermore, the open-type undershot turbine can be installed on the catamaran-structure float by a float-type waterwheel mounting mechanism, allowing it to follow the waterway surface shape that changes significantly depending on the incoming current speed.

[0022] Therefore, in the present invention, the float on which the open undershot water turbine is installed has a structure that follows the current diversion and a waterway structure that efficiently guides the tidal current into the waterway on which the turbine is installed, making it possible to provide a floating water turbine device and a floating tidal power generation facility that can efficiently regenerate surface tidal current energy. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a plan view that shows a schematic diagram of a floating tidal power generation facility according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic side view of the floating tidal power generation facility. [Diagram 3] FIG. 3 is a front view of a main portion, which is a schematic diagram showing the mooring structure of the float in the floating tidal power generation facility. [Figure 4] Figure 4 shows the flow velocities obtained in experiments using simplified channel models (Ch.A), (Ch.B), and (Ch.C) in a circulating water channel to examine the effect of the channel shape of a catamaran-structured float on the internal flow in a flow field where both internal and external flows are mixed. [Diagram 5] FIG. 5 shows an experiment using a circulating water channel to confirm the water surface shape for a model water channel (Ch. A) with a wider downstream channel width. [Figure 6] FIG. 6 is a diagram showing the water surface shapes obtained by the above experiment. [Figure 7] FIG. 7 is a plan view that shows a schematic diagram of a floating tidal power generation facility according to another embodiment of the present invention. [Figure 8] FIG. 8 is a schematic side view of the floating tidal power generation facility. [Figure 9] Figures 9 (A) and (B) show the shape of the rubber boats used as the two bodies that make up the floats in the floating tidal power generation facility described above, where (A) is a plan view of the rubber boat and (B) is a side view of the rubber boat. [Figure 10] FIG. 10 is a schematic front view showing the rubber boat in longitudinal section. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a floating water turbine device and a floating tidal power generation facility according to the present invention will be described in detail with reference to the drawings.

[0025] The present invention is applied to a floating tidal power generation facility 100 having a configuration as shown in, for example, Figs. 1 to 3 .

[0026] FIG. 1 is a plan view showing a floating tidal power generation facility 100 according to one embodiment of the present invention, FIG. 2 is a schematic side view of the floating tidal power generation facility 100, and FIG. 3 is a schematic front view of a main portion of the mooring structure of the float in the floating tidal power generation facility 100.

[0027] This floating tidal power generation facility 100 comprises a floating water turbine device 10 according to one embodiment of the present invention, and a generator 110 driven by the rotation of an open undershot water turbine 13 provided on the floating water turbine device 10.

[0028] The floating water turbine device 10 comprises a catamaran-structure float 11 in which two side-by-side body parts (floats) 11A, 11B are connected by a deck 11C made of wood, metal, fiber reinforced plastics (FRP), etc., and an open-type undershot water turbine 13 is mounted on the float 11, with the waterway 12 being between the two side-by-side body parts (floats) 11A, 11B.

[0029] The two bodies 11A, 11B constituting the catamaran-structured float 11 are made lightweight by being made of hollow floats, for example made of rubber, that have a buoyancy corresponding to the weight of the deck 11C on which the open-type undershot water turbine 13 is mounted.

[0030] The waterway 12 in this floating water turbine device 10 is made of, for example, FRP, and has a waterway structure with an upstream turbine installation section 12A where the open type undershot water turbine 13 is placed, and a downstream widening section 12B, as shown in Figures 1 and 2. The downstream widening section 12B is formed by widening the waterway side walls 12a, 12b behind the turbine in the flow direction from a position about 1 / 3 of the way from the upstream side of the entire waterway length, and by inclining the waterway floor surface 12c.

[0031] Here, Fig. 4 shows the passing flow velocities obtained by experiments in a circulating water tank using simplified channel models (Ch.A), (Ch.B), and (Ch.C) to examine the effect of the channel shape of a catamaran-structured float on the internal flow in a flow field where both inside and outside flows coexist. Fig. 5 shows an experiment using a circulating water tank to confirm the water surface shape for a channel model (Ch.A) with a wider downstream channel width. Fig. 6 shows the water surface shapes obtained by the above experiment.

[0032] In other words, in a flow field where both inside and outside flows of the channel formed by the catamaran-structured float are mixed, a model that simplified the conditions for the effect of the channel shape formed by the float on the internal flow was used to conduct experiments in a circulating water tank for a channel model with a wider downstream channel width (Ch.A), a channel model with a constant channel width (Ch.B), and a channel model with a wider upstream channel width (Ch.C) as shown in Figure 4. It was confirmed that the passing flow velocity in the channel model (Ch.A) where the wake of the turbine was doubled (Ch.A) was 1.5 times faster than the channel model with the wider upstream channel width (Ch.C). Figure 5 shows the water surface shape of the channel model (Ch. A) with the wider downstream channel width confirmed by the experiment using a circulating water tank, with a change in height occurring in the water surface shape. That is, near the entrance of Ch. A, the water surface shows a supercritical flow, where the flow speed decreases and the water level rises rapidly in the downstream expansion section, where it becomes a normal flow with an increased water level. In the model of the channel (Ch. A) where the width of the channel on the downstream side is wider, the water level drops suddenly near the entrance, and an increase in speed exceeding the oncoming flow velocity was confirmed locally. As shown in Figure 6, the water surface shapes obtained from the above experiment show that while the water surface shape of Ch. C has a gradual change in height, in Ch. A the water level drops suddenly from the entrance, and it was confirmed that by making the downstream side of the channel twice as wide in the width direction, not only the passing flow velocity but also the water level difference can be increased.

[0033] In this floating water turbine device 10, the waterway structure has an expansion section 12B downstream of the upstream turbine installation section 12A where the open-type undershot water turbine 13 is located, thereby making it possible to increase the specific energy of the passing fluid.

[0034] That is, as is clear from the above experiment, the specific energy of the passing fluid can be increased by widening the channel side walls 12a, 12b behind the turbine in the flow direction to gradually increase the cross-sectional area of ​​the channel 12. Similarly, the specific energy of the passing fluid can also be increased by gradually increasing the cross-sectional area of ​​the channel 12 by giving an inclination angle to the channel floor 12c of the channel 12.

[0035] In this floating water turbine device 10, a waterway structure is used in which both the waterway width and the bed inclination angle are changed to increase the specific energy of the passing fluid, but a waterway structure in which only one of the waterway width or the bed inclination angle is changed may also be used.

[0036] Furthermore, by making the waterway 12 wider on the downstream side as described above, not only the passing flow velocity but also the water level difference can be made large. Therefore, in this floating water turbine device 10, by installing the open type undershot water turbine 13 near the front edge of the waterway 12, the head difference, i.e., the difference between the water level at which the tips of the blades of the open type undershot water turbine 13 begin to contact the water surface and the water level when located directly below the rotating shaft 13A, can be utilized to lower the minimum starting flow velocity, making it possible to start the water turbine from a lower tidal current speed.

[0037] Furthermore, in this floating water turbine device 10, the water surface shape at the water turbine installation section 12A on the upstream side of the waterway 12 changes significantly depending on the incoming flow speed, so that the maximum output of the open type undershot water turbine 13 can be maintained by adjusting the mounting height of the water turbine to follow the fluctuations in the water surface.

[0038] That is, the open type undershot water turbine 13 in this floating water turbine device 10 is mounted on the catamaran-structured float 11 by a float-type water turbine mounting mechanism 20, as shown in Figs.

[0039] The float type water turbine mounting mechanism 20 comprises a float 21 (21A, 21B) which forms the water channel side wall at the front edge of the water channel 12, a bearing portion 22 (22A, 22B) supported by the float 21 (21A, 21B) which rotatably supports the rotating shaft 13A of the open type undershot water turbine 13 on both sides above the water channel, and a buoyancy adjustment means 23 for adjusting the buoyancy of the float 21 (21A, 21B).

[0040] The buoyancy adjustment means 23 can be configured such that the float 31 (21A, 21B) is attached to one end of a swing lever 25 (25A, 25B) swingably supported by a pivot 24 provided on the floating body 11, a weight 26 is attached to the other end of the swing lever 25 (25A, 25B), the bearing portion 22 (22A, 22B) is provided on one end side of the swing lever 25 (25A, 25B), and the buoyancy of the float 21 (21A, 21B) is adjusted by the balance with the weight 26 via the swing lever 25 (25A, 25B). This allows the submerged depth of the turbine blades to be adjusted and kept constant in response to vertical fluctuations in the water level.

[0041] Furthermore, in the floating water turbine device 10, the buoyancy adjustment means 23 can adjust the buoyancy of the float 21 (21A, 21B) with ballast water 23A injected into the float 21 (21A, 21B).

[0042] In this way, the open type undershot water turbine 13 installed on the catamaran structure float 11 by the float type water turbine mounting mechanism 20 can automatically follow the water level that changes due to the passing flow speed of the water channel 12 at the water turbine installation section 12A on the upstream side of the water channel 12 in this floating water turbine device 10, and can maintain maximum output.

[0043] Furthermore, in the floating water turbine device 10, the catamaran-structured float 11 is moored to a mooring anchor 32 fixed to the seabed 40 via a single mooring line 30C, which is formed by gathering left and right mooring lines 30 (30A, 30B) that are pulled out from a position approximately 1 / 3 of the way from the leading edge of the float's total length with a swivel 31, as shown in Figures 2 and 3.

[0044] The above-mentioned left and right mooring ropes 30 (30A, 30B) are pulled out from the floating body side attachment point O (O A ,O B) is located halfway between the floating center of gravity (metacenter) of the catamaran-structured float 11 on which the open-type undershot water turbine 13 is installed and the turbine rotating shaft 13A, and the catamaran-structured float 11, which is moored to a mooring anchor 32 fixed to the seabed via a single mooring rope 30C that is formed by gathering the left and right mooring ropes 30 (30A, 30B) with a swivel 31, can freely change direction according to the direction of the tidal current, and the widening section 12B side of the waterway 12 automatically becomes downstream of the tidal current.

[0045] That is, in the floating water turbine device 10, the open undershot water turbine 13 is installed in the water channel 12 between the two juxtaposed fuselage bodies 11A, 11B constituting the catamaran-structure float 11, and the specific energy of the passing fluid can be increased by widening the water channel side walls 12a, 12b in the wake of the water turbine in the flow direction and / or by forming a water channel structure having an expanded section 12B downstream of the water turbine installation section 12A by inclining the water channel floor surface 12c. Also, the catamaran-structure float 11 has a float-side attachment point O (O A ,O B ) are gathered together by a swivel 31 and moored via a single mooring rope to a mooring anchor 32 fixed to the seabed, so that the widened section 12B of the waterway 12 is automatically downstream of the tidal current, thereby maintaining the effect of increasing the specific energy at all times and allowing the open-type undershot waterwheel 13 to be efficiently rotated by the surface tidal current energy. This floating waterwheel device 10 combines a structure that follows the current diversion with a waterway structure that efficiently guides the tidal current to the waterway 12's turbine installation section 12A side.

[0046] Furthermore, in the floating water turbine device 10, the open type undershot water turbine 13 installed on the catamaran structure float 11 by the float type water turbine mounting mechanism 20 can automatically follow the water level that changes depending on the passing flow speed of the water channel 12 at the water turbine installation section 12A on the upstream side of the water channel 12, and can maintain maximum output.

[0047] Therefore, in the floating tidal power generation facility 100 in which the generator 110 is driven by the rotation of the open undershot turbine 13 provided on the floating water turbine device 10, surface tidal energy can be efficiently regenerated.

[0048] Next, Figure 7 is a schematic plan view of a floating tidal power generation facility 100A according to another embodiment of the present invention, and Figure 8 is a schematic side view of the floating tidal power generation facility 100A.

[0049] In the floating tidal power generation facility 100A shown in Figs. 7 and 8, two rubber boats 11A and 11B are used as the two fuselages 11A and 11B constituting the catamaran-structured float 11 in the floating tidal power generation facility 100. a1 , 11 a2 11 b1 , 11 b2 has been adopted.

[0050] One of the bodies 11A constituting the floating body 11 is made up of two rubber boats 11 arranged in tandem. a1 , 11 a2: The other body 11B is made up of two rubber boats 11 arranged in tandem. b1 , 11 b2 It consists of:

[0051] In this floating tidal power generation facility 100A, the two fuselage bodies 11A and 11B constituting the catamaran-structured float 11 are each made up of two rubber boats 11. a1 , 11 a2 11 b1 , 11 b2 Other than the adoption of the above, the other components are the same as those of the tidal power generation facility 100 described above, so the same reference numerals are used in the drawing and detailed description of them is omitted.

[0052] That is, in the floating tidal power generation equipment 100, the catamaran-structure float 11 is composed of two bodies 11A, 11B consisting of hollow rubber floats having buoyancy corresponding to the weight of the deck 11C on which the open undershot water turbine 13 provided on the floating water turbine device 10 is mounted, but as shown in the floating tidal power generation equipment 100A shown in Figures 7 and 8, a commercially available rubber boat 1 can be used as the two bodies 11A, 11B.

[0053] 1 9(A) and (B) are diagrams showing the shape of a rubber boat 1 used as two bodies 11A and 11B constituting the float 11 in the floating tidal power generation facility 100A, where (A) is a plan view of the rubber boat 1 and (B) is a side view of the rubber boat 1. Also, Fig. 10 is a schematic front view showing the rubber boat 1 in longitudinal section.

[0054] The rubber boat 1 has air tubes 2 made of materials such as rubber, polyvinyl chloride (PVC), and Hypalon (a mixture of rubber and plastic) that are arranged around the hull and filled with air to provide buoyancy, and an air floor 4 is laid on the bottom of the hull (rigid-flex keel) 3.

[0055] This rubber boat 1 is able to move forward under its own power by attaching an outboard engine (not shown) to the stern. As shown in Figure 10, by creating a cavity 6 between the water surface 5 and the bottom of the boat (rigid-flex keel) 3, which has a shallow V-shape in the center, an air lift F is generated when the boat is moving, reducing contact resistance with the water surface 5.

[0056] In this floating tidal power generation facility 100A, a commercially available rubber boat 11 is used as the two bodies 11A and 11B, which are hollow rubber floats having a buoyancy corresponding to the weight of the deck 11C on which the open undershot water turbine 13 provided in the floating water turbine device 10A is mounted. a1 , 11 a2 11 b1 , 11 b2By providing a catamaran-structured floating body 11 using the above, the manufacturing cost can be reduced and the equipment can be maintained and managed manually.

[0057] Furthermore, in this floating tidal power generation facility 100A, the float 11 on which the open undershot water turbine 11 is installed has both a structure that follows the current diversion and a waterway structure that efficiently guides the tidal current into the waterway on the turbine installation side, enabling surface tidal current energy to be efficiently regenerated.

[0058] That is, in this floating tidal power generation facility 100A, as in the above-mentioned tidal power generation facility 100, the open undershot water turbine 13 is installed as a waterway 12 between two juxtaposed bodies 11A, 11B constituting a catamaran-structured float 11, and the specific energy of the passing fluid can be increased by widening the waterway side walls 12a, 12b downstream of the water turbine in the flow direction and / or by inclining the waterway floor surface 12c to form a waterway structure with a widened section 12B on the downstream side. Also, in the above-mentioned catamaran-structured float 11, the left and right mooring lines 30 drawn from the float-side attachment point O located halfway between the float's center of gravity and the water turbine rotating shaft 13A are collected by a swivel 31 and moored to a mooring anchor 32 fixed to the seabed via a single mooring line 30C, so that the widened section 12B side of the waterway 12 automatically becomes downstream with respect to the tidal current. Furthermore, by mounting the open-type undershot water turbine 13 on the catamaran-structured floating body 11 using a float-type water turbine mounting mechanism 20, it is possible to make the turbine follow the waterway surface shape, which changes significantly depending on the incoming flow speed. [Explanation of symbols]

[0059] 1, 11 a1 , 11 a2 11 b1 , 11 b2Rubber boat, 2 Air tube 2, 3 Ship bottom (rigid flex keel), 5 Water surface, 10, 10A Floating water turbine device, 11 Float, 11A, 11B Two fuselage bodies, 11C Deck, 12 Waterway, 12A Water turbine installation section, 12B Flow expansion section, 12a, 12b Waterway side wall, 12c Waterway floor surface, 13 Open type undershot water turbine, 13A Rotating shaft, 20 Float type water turbine mounting mechanism, 21 (21A, 21B) Float, 22 (22A, 22B) Bearing section, 23 Buoyancy adjustment means, 23A Ballast water, 24 Pivot, 25 (25A, 25B) Swing lever, 30 (30A, 30B), 30C Mooring line, 31 Swivel, 32 Mooring anchor, 40 Subsea, 100, 100A Floating tidal power generation equipment, O, O A ,O B Floating body side attachment point,

Claims

1. A catamaran-structured float having two juxtaposed fuselages; A waterway provided between the two juxtaposed body bodies and having a flow expansion portion on a downstream side; an open undershot water turbine provided on the upstream side of the waterway; Equipped with The catamaran-structure float is moored to a mooring anchor fixed to the seabed via a single mooring rope that is assembled by a swivel from left and right mooring ropes drawn from a float-side attachment point located midway between the float's center of gravity and the rotation axis of the open-type undershot water turbine. A floating water turbine device characterized by:

2. The floating water turbine device according to claim 1, characterized in that the expansion section of the waterway starts widening the waterway side walls and / or inclining the waterway floor at a position approximately 1 / 3 of the way upstream of the total length of the waterway.

3. 2. The floating water turbine device according to claim 1, wherein the left and right mooring ropes are pulled out from a position approximately 1 / 3 of the way from the leading edge of the catamaran structure float.

4. The floating water turbine device described in claim 1, characterized in that the open-type undershot water turbine is installed upstream of the waterway using a float-type water turbine mounting mechanism that automatically follows the water level that changes depending on the passing flow speed.

5. The float-type water turbine mounting mechanism is as follows: A float constituting a waterway side wall at a leading edge of the waterway; a bearing portion supported by the float for rotatably supporting a rotating shaft of the open type undershot water turbine; A buoyancy adjustment means for adjusting the buoyancy of the float; 5. The floating water turbine device according to claim 4, further comprising:

6. The buoyancy adjustment means is A swing lever is provided on the floating body so as to be swingable, A floating water turbine device as described in claim 5, characterized in that the float is attached to one end of the rocking lever, a weight is attached to the other end of the rocking lever, and the bearing portion is provided on the one end side of the rocking lever, so that with the bearing portion supported by the float, the buoyancy of the float is adjusted by balancing with the weight via the rocking lever.

7. The floating water turbine device according to claim 6, characterized in that the buoyancy adjustment means adjusts the buoyancy of the float with ballast water.

8. The floating water turbine device according to claim 4, characterized in that the open type undershot water turbine is installed near the leading edge of the waterway, thereby utilizing the head difference to lower the minimum starting flow velocity.

9. A floating water turbine device according to any one of claims 1 to 8, a generator driven by the rotation of an open undershot water turbine provided on the floating water turbine device; A floating tidal power generation facility comprising:

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