JP2024029771A - Power generation equipment and wave power generation system - Google Patents

Abstract

The present invention provides a power generation device and a wave power generation system that can improve power generation efficiency. A power generation device (1) that generates electricity using a fluid flow, which includes a rotating part (10) having a Savonius type structure, and a rotating part (10) that is provided apart from the rotating part (10). A shielding plate 20 having opposing first main surfaces 20a is provided. The rotating section 10 includes a sending section A that rotates along the downstream DS from the upstream US of the fluid, and a return section B that rotates along the upstream US from the downstream DS, and The plate 20 is inclined with respect to the flow path direction Y in which the fluid flows, and is provided close to the return portion DS in the upstream US. [Selection diagram] Figure 1

Description

The present invention relates to a power generation device and a wave power generation system.

BACKGROUND ART Conventionally, as a power generation device that generates power using a flow of fluid, a wave power generation system such as that disclosed in Patent Document 1 has been proposed, for example.

Patent Document 1 discloses a wave power generation system that includes a breakwater, a water wheel provided on the breakwater, a rotating shaft that rotates in conjunction with the rotation of the water wheel, and a generator that generates power as the rotating shaft rotates. has been done. In the wave power generation system of Patent Document 1, the breakwater is provided with a slit and a water retarding chamber communicating with the slit, and a water wheel is provided in at least one of the slit and the water retarding chamber.

Japanese Patent Application Publication No. 2013-002410

Patent Document 1 discloses that, in addition to the Savonius type, a Darius type or a gyro mill type structure can be used as a water turbine. Here, in a power generation device using a Savonius type structure, improvement of power generation efficiency has been raised as an issue. In this regard, the technique disclosed in Patent Document 1 does not describe or suggest improvement of power generation efficiency by focusing on the Savonius structure.

Therefore, the present invention was devised in view of the above-mentioned problems, and its purpose is to provide a power generation device and a wave power generation system that can improve power generation efficiency. .

A power generation device according to a first aspect of the present invention is a power generation device that generates electricity using a flow of fluid, and includes a rotating portion having a Savonius type structure, and a rotating portion provided apart from the rotating portion. a shielding plate having a first main surface facing the fluid, and the rotating section includes a feeding section that rotates from the upstream to the downstream of the fluid, and a return that rotates from the downstream to the upstream of the fluid. The shielding plate is inclined with respect to the flow path direction of the fluid and is provided close to the return portion at the upstream side.

In the power generating device according to a second aspect of the invention, in the first aspect, the length of the shielding plate is equal to or longer than the length of the rotating portion in the height direction along the rotation axis of the rotating portion. Features.

A wave power generation system according to a third aspect of the invention is a wave power generation system that generates electricity using water that enters a slit in a breakwater, and includes the power generation device according to the first or second invention, wherein the power generation device is , provided in a slit of the breakwater or a water retarding chamber connected to the slit of the breakwater.

A wave power generation system according to a fourth aspect of the invention is characterized in that, in the third aspect, the shielding plate is provided at an angle of 20 degrees or more and 40 degrees or less with respect to the flow path direction.

A wave power generation system according to a fifth aspect of the present invention is characterized in that, in the third aspect, the shielding plate is provided to overlap the rotating section when viewed from the flow path direction.

In the wave power generation system according to a sixth aspect of the invention, in the third aspect, the first main surface of the shielding plate overlaps with the rotation axis of the rotating part when viewed from the width direction perpendicular to the flow path direction. It is characterized by

In the wave power generation system according to a seventh aspect, in the third aspect, the shielding plate includes a first shielding plate provided close to the return section in the upstream, and a first shielding plate provided close to the sending section in the downstream. A second shielding plate is provided.

The wave power generation system according to an eighth aspect of the invention is characterized in that, in the seventh aspect, the first shielding plate and the second shielding plate are provided at different angles with respect to the flow path direction. .

According to the first to eighth inventions, the shielding plate is inclined with respect to the flow path direction and is provided close to the return section upstream. For this reason, it is possible to suppress vortices generated near the return portion downstream as the rotating portion rotates. Thereby, it is possible to prevent a decrease in the driving force of the rotating portion due to the generation of vortices. Therefore, it is possible to improve power generation efficiency.

In particular, according to the second invention, the length of the shielding plate is equal to or longer than the length of the rotating part. Therefore, it is possible to suppress the generation of vortices that may occur from the lower end to the upper end of the rotating portion. This makes it possible to further improve power generation efficiency.

In particular, according to the third invention, the power generation device is provided in a slit of a breakwater or in a water retarding chamber. Therefore, the slit can suppress fluctuations in the direction of flow of water acting on the rotating portion. This makes it possible to efficiently suppress eddies.

In particular, according to the fourth invention, the shielding plate is provided at an angle of 20° or more and 40° or less with respect to the flow path direction. Therefore, in addition to suppressing the generation of vortices, it is possible to reduce the possibility that the shielding plate will come into contact with the rotating portion. This makes it possible to suppress deterioration of the power generation device.

In particular, according to the fifth invention, the shielding plate is provided to overlap the rotating part when viewed from the flow path direction. Therefore, the action of water that affects the rotation of the return portion can be suppressed. This makes it possible to further improve power generation efficiency.

In particular, according to the sixth invention, the first main surface of the shielding plate overlaps with the rotation axis of the rotating part when viewed from the width direction. Therefore, the action of water that affects the rotation of the return portion can be suppressed. This makes it possible to further improve power generation efficiency.

In particular, according to the seventh invention, the shielding plate includes a second shielding plate provided close to the downstream feeding section. For this reason, when the rotating section is rotated by water flowing from the inside of the breakwater to the outside, it is possible to suppress the vortex generated in the upstream vicinity of the sending section. Thereby, even if the direction in which water flows changes over time, it is possible to prevent the driving force of the rotating portion from decreasing. Therefore, it becomes possible to further improve power generation efficiency.

In particular, according to the eighth invention, the first shielding plate and the second shielding plate are provided at different angles with respect to the flow path direction. Therefore, even when the flow velocity differs depending on the direction in which water flows, it is possible to suppress eddies in a manner appropriate to the flow velocity. This makes it possible to stably improve power generation efficiency.

FIG. 1(a) is a schematic perspective view showing an example of the power generation device in the embodiment, and FIG. 1(b) is a schematic cross-sectional view corresponding to 1B-1B in FIG. 1(a). FIG. 2(a) is a schematic sectional view showing an example of the wave power generation system in this embodiment, and FIG. 2(b) is a schematic front view showing an example of the wave power generation system in this embodiment, FIG. 2(c) is a schematic top view showing an example of the wave power generation system in this embodiment. FIG. 3(a) is a schematic front view showing an example of the wave power generation system in this embodiment, and FIG. 3(b) is a schematic side view showing an example of the wave power generation system in this embodiment. FIG. 4 is a schematic cross-sectional view showing an example of a shielding plate. FIG. 5 is a schematic diagram showing an example of an evaluation device. FIGS. 6(a) and 6(b) are schematic cross-sectional views showing an example of a power generation device to be evaluated. FIG. 7 is a diagram showing the results of particle image velocimetry in a comparative example. FIG. 8 is a diagram showing the results of particle image velocimetry in Example 1. FIG. 9 is a graph showing the measurement results of the comparative example and Examples 1 and 2. FIG. 10 is a graph showing the measurement results of Comparative Example and Examples 3 to 5. FIG. 11 is a graph showing the measurement results of Comparative Example and Examples 6 to 8. FIG. 12 is a graph showing the measurement results of Comparative Example and Examples 9 and 10.

Hereinafter, an example of a power generation device and a wave power generation system according to an embodiment of the present invention will be described with reference to the drawings. In the following explanation, the direction along the rotation axis of the power generation device is defined as the height direction Z, the main path of the fluid that promotes rotation of the power generation device is defined as the flow direction Y, and the height direction Z and the flow direction are defined as The direction intersecting Y is defined as the width direction X. Furthermore, with respect to the direction in which fluid flows, upstream US and downstream DS will be classified and explained based on the position of the rotation axis of the power generation device.

(Embodiment: Power generation device 1)
FIG. 1(a) is a schematic diagram showing an example of the power generation device 1 in the embodiment, and FIG. 1(b) is a schematic cross-sectional view corresponding to 1B-1B in FIG. 1(a).

The power generation device 1 is used to generate power using a flow of fluid. The power generation device 1 is installed in a place where a fluid such as water or air can easily flow from a certain direction.

The power generation device 1 includes, for example, a rotating section 10 and a shielding plate 20, as shown in FIG. 1(a). The power generation device 1 is connected to a device that converts kinetic energy into electrical energy, such as a known generator (not shown). The power generation device 1 may include, for example, a rectification mechanism for adjusting the direction of fluid.

<Rotating part 10>
The rotating portion 10 has a Savonius type structure. The rotating portion 10 includes, for example, wings 11, a support portion 12, and a shaft 13. The rotating part 10 can generate power by applying a fluid load to the blades 11 and rotating the shaft 13 via the support part 12 . Note that a known Savonius type waterwheel or windmill can be used as the rotating part 10.

The blade 11 has an arcuate cross-sectional structure, for example, as shown in FIG. 1(b). For example, two blades 11 are provided point-symmetrically with respect to the rotation axis C when viewed from the height direction Z (11a, 11b in FIG. 1(b)). In addition to the above, the number of blades 11 can be arbitrarily provided depending on the purpose.

The support part 12 supports the wing 11 and is connected to the shaft 13. The support portion 12 includes a pair of support portions 12a and 12b that support the wing 11 with the wing 11 sandwiched therebetween, for example along the height direction Z. The support portion 12 has a circular shape centered on the position of the shaft 13, for example.

The shaft 13 extends in the height direction Z and corresponds to the rotation axis C of the rotating portion 10. The shaft 13 is connected to, for example, a generator. For example, when fluid flows from the upstream US to the downstream DS, a load is applied to the blades 11, causing the shaft 13 to rotate. Note that in FIG. 1(b), the direction in which the fluid flows is indicated by a white arrow.

The rotating section 10 has a sending section A and a returning section B. The sending part A indicates a part that rotates along the fluid from the upstream US to the downstream DS. The return portion B indicates a portion that rotates from the downstream DS to the upstream US of the fluid. That is, the sending section A and the returning section B indicate specific areas in the rotating section 10. Note that the sending section A and the returning section B can be shown divided in the width direction X with the rotation axis C as a boundary.

<Shielding plate 20>
The shielding plate 20 is provided apart from the rotating part 10. The shielding plate 20 has a first main surface 20a facing the rotating portion 10, for example, as shown in FIG. 1(b). The shielding plate 20 is inclined with respect to the flow path direction Y and is provided close to the return section B in the upstream US.

Here, as the rotating part 10 rotates, a fluid vortex may be generated near the return part B in the downstream DS. The inventors have discovered that this vortex may cause a decrease in the driving force (rotational speed) of the rotating portion 10 (region P in FIG. 7). In addition, the inventors confirmed that the generation of the vortex can be suppressed by providing the shielding plate 20 at the return portion B in the upstream US, which is inclined with respect to the flow path direction Y (region P in FIG. 8). ). Thereby, it is possible to prevent a decrease in the driving force of the rotating portion 10 due to the generation of vortices. Note that details of FIGS. 7 and 8 will be described later.

For example, a steel material such as an iron plate is used as the shielding plate 20, and a known material that can withstand wind power and water power is used. The shape of the shielding plate 20 is arbitrary, and for example, at least a portion thereof may be curved. In particular, when the shielding plate 20 is shaped like a plate with a flat first main surface 20a, it is possible to reduce the portion where the load of wind power, hydraulic power, etc. is concentrated, and it is possible to suppress deterioration.

For example, in the height direction Z, the length of the shielding plate 20 is longer than the length of the rotating part 10. In this case, generation of vortices that may occur from the lower end to the upper end of the rotating portion 10 can be suppressed.

(Embodiment: Wave power generation system 100)
Next, an example of the wave power generation system 100 in this embodiment will be described. FIG. 2(a) is a schematic sectional view showing an example of the wave power generation system 100 in this embodiment, and FIG. 2(b) is a schematic front view showing an example of the wave power generation system 100 in this embodiment. 2(c) is a schematic top view showing an example of the wave power generation system 100 in this embodiment.

The wave power generation system 100 is installed on a breakwater 5 installed underwater. The breakwater 5 includes a plurality of slits 51, for example, as shown in FIGS. 2(a) to 2(c), and may include, for example, a water retarding chamber 52 connected to the slits 51. Note that the wave power generation system 100 can be arbitrarily provided depending on the characteristics of the breakwater 5.

The wave power generation system 100 is used to generate power using water that enters the slit 51 of the breakwater 5. The wave power generation system 100 includes the power generation device 1 described above, and further includes, for example, a generator 30. The power generation device 1 may be provided, for example, in the slit 51, in addition to being provided in the water retarding chamber 52, as shown in FIG. 2(a).

Here, when the waves approaching the breakwater 5 reach the slit 51, the direction of the water flow is adjusted in the flow path direction Y at the slit 51. Therefore, by providing the power generation device 1 in the slit 51 or the water retarding chamber 52, it is possible to suppress fluctuations in the flow direction of water acting on the rotating portion 10. In this case, it becomes easier to maintain the positional relationship in which the shielding plate 20 is inclined with respect to the direction of the water flow. This makes it possible to effectively suppress vortices.

Furthermore, when a wave power generation device is installed on the sea, if a part of the device is damaged, there is a risk of serious damage. Therefore, from the viewpoint of improving safety, it is desired to reduce the amount of materials that constitute wave power generation. In particular, when a rectification mechanism is provided to adjust the direction of water acting on the power generation device, there is a concern about damage caused by damage to the rectification mechanism.

In this regard, in the wave power generation system 100 according to the present embodiment, the power generation device 1 is provided in the slit 51 or the water retarding chamber 52. Therefore, there is no need to provide a rectifying mechanism for rectifying water around the rotating portion 10. This makes it possible to improve the safety associated with the installation of the wave power generation system 100.

The rotating part 10 and the shielding plate 20 are fixed to the bottom surface of the breakwater 5, for example. The rotating part 10 and the shielding plate 20 may be fixed in any manner.

The rotating part 10 is connected to a generator 30 via a shaft 13, for example, as shown in FIG. 2(c). The generator 30 is provided, for example, above the water retarding chamber 52 or the slit 51. As the generator 30, a known device can be used depending on the purpose.

The shielding plate 20 is provided, for example, at an angle of 20° or more and 40° or less with respect to the flow path direction Y. For example, if the shielding plate is provided at an angle of less than 20°, there is a concern that generation of vortices cannot be suppressed. Further, for example, if the shielding plate is provided at an angle greater than 40°, there is a concern that the shielding plate will come into contact with the rotating portion. Accordingly, by providing the shielding plate 20 at an angle of 20° or more and 40° or less, in addition to suppressing the generation of vortices, it is possible to reduce the possibility that the shielding plate 20 will come into contact with the rotating portion 10.

For example, as shown in FIG. 3(a), the shielding plate 20 is provided to overlap the rotating portion 10 when viewed from the flow path direction Y. In this case, the action of water flowing from the upstream US to the downstream DS on the blade 11 located in the return section B can be suppressed. Note that, for example, when the shielding plates 20 are provided so as to overlap from the return section B to a position beyond the rotation axis C when viewed from the flow path direction Y, there is a concern that water flowing to the sending section A will be obstructed. For this reason, it is preferable that the shielding plates 20 are provided so as to overlap to a position between the return portion B and the rotation axis C when viewed from the flow path direction Y.

For example, as shown in FIG. 3(b), the first main surface 20a of the shielding plate 20 overlaps the rotation axis C when viewed from the width direction X. In this case, the effect of water flowing from upstream US to downstream DS along shielding plate 20 on blade 11 located in return section B can be suppressed.

For example, as shown in FIG. 4, the shielding plate 20 may include, in addition to the first shielding plate 20f provided at the position described above, a second shielding plate 20s provided close to the sending section A in the downstream DS. . In this case, when the rotating section 10 is rotated by the water flowing from the inside of the breakwater 5 toward the outside, it is possible to suppress the vortex generated near the sending section A in the upstream US. Thereby, even if the direction in which water flows changes over time, it is possible to prevent the driving force of the rotating portion 10 from decreasing. The material and shape of each of the shielding plates 20f and 20s may be the same, or may be different materials or shapes depending on the purpose.

For example, the first shielding plate 20f and the second shielding plate 20s are provided at different angles with respect to the flow path direction Y, respectively. In this case, even if the flow velocity differs depending on the direction in which water flows, it is possible to suppress vortices in a manner appropriate to the flow velocity.

For example, the direction of the water flowing from the outside of the breakwater 5 into the water retarding chamber 52 is adjusted in the flow path direction Y by the slit 51. On the other hand, among the water flows flowing from the water retarding chamber 52 to the outside of the breakwater 5, it is difficult to adjust the direction of the water flow before passing through the slit 51 to the flow path direction Y due to characteristics such as the structure of the water retarding chamber 52. In this case, by setting the second angle θs of the second shielding plate 20s to a different angle from the first angle θf of the first shielding plate 20f, the second shielding plate 20s can be adjusted to suit the characteristics of the water retarding chamber 52. It becomes possible to realize the installation.

According to this embodiment, the shielding plate 20 is inclined with respect to the flow path direction Y and is provided close to the return part B in the upstream US. Therefore, as the rotating portion 10 rotates, vortices generated near the return portion B in the downstream DS can be suppressed. Thereby, it is possible to prevent a decrease in the driving force of the rotating portion 10 due to the generation of vortices. Therefore, it is possible to improve power generation efficiency.

Further, according to the present embodiment, the length of the shielding plate 20 in the height direction Z is greater than or equal to the length of the rotating portion 10 in the height direction Z. Therefore, the generation of vortices that may occur from the lower end to the upper end of the rotating portion 10 can be suppressed. This makes it possible to further improve power generation efficiency.

Moreover, according to this embodiment, the power generation device 1 is provided in the slit 51 of the breakwater 5 or the water retarding chamber 52. Therefore, the slit 51 can suppress fluctuations in the direction of water flow acting on the rotating portion 10. This makes it possible to efficiently suppress eddies.

Further, according to the present embodiment, the shielding plate 20 is provided at an angle of 20° or more and 40° or less with respect to the flow path direction Y. Therefore, in addition to suppressing the generation of vortices, it is possible to reduce the possibility that the shielding plate 20 will come into contact with the rotating portion 10. Thereby, it becomes possible to suppress deterioration of the power generation device 1.

Furthermore, according to the present embodiment, the shielding plate 20 is provided to overlap the rotating portion 10 when viewed from the flow path direction Y. Therefore, the action of water that affects the rotation of the return portion B can be suppressed. This makes it possible to further improve power generation efficiency.

Further, according to the present embodiment, when viewed from the width direction X, the first main surface 20a of the shielding plate 20 overlaps with the rotation axis C (for example, the shaft 13) of the rotating portion 10. Therefore, the action of water that affects the rotation of the return portion B can be suppressed. This makes it possible to further improve power generation efficiency.

Further, according to the present embodiment, the shielding plate 20 includes a second shielding plate 20s provided close to the sending section A in the downstream DS. Therefore, when the rotating section 10 is rotated by water flowing from the inside of the breakwater 5 to the outside, it is possible to suppress the vortex generated near the sending section A in the upstream US. Thereby, even if the direction in which water flows changes over time, it is possible to prevent the driving force of the rotating portion 10 from decreasing. Therefore, it becomes possible to further improve power generation efficiency.

Further, according to this embodiment, the first shielding plate 20f and the second shielding plate 20s are provided at different angles with respect to the flow path direction Y, respectively. Therefore, even when the flow velocity differs depending on the direction in which water flows, it is possible to suppress eddies in a manner appropriate to the flow velocity. This makes it possible to stably improve power generation efficiency.

Next, an example of the wave power generation system 100 in this embodiment will be described.

In this example, the above-described wave power generation system 100 was evaluated using the evaluation device 8 shown in FIG. The evaluation conditions and evaluation results will be explained below.

In this example, the rotating section 10 and the shielding plate 20 were installed in the evaluation section 81 shown in FIG. The rotating part 10 was connected to the measuring instrument 7 via a shaft 13. A pump 83 was connected to the evaluation unit 81 via a path 82, and conditions were set such that water would flow in one direction (the direction of the arrow in FIG. 5).

The evaluation unit 81 used a water tank having a length of 1,000 mm in the flow path direction Y, a height of 300 mm in the height direction Z, and a depth of 140 mm in the width direction X. The water flow velocity was set to 0.078 m/s, which is similar to the water flow caused by waves with a period of 5 seconds and a wave height of 0.5 m.

A Savonius type water wheel with a height of 230 mm and a diameter of 80 mm was used as the rotating part 10. A predetermined torque T [mNm] was applied to the rotating portion 10 using a torque load device included in the measuring instrument 7. In addition, the rotation angle is recorded as a function of time using the rotary encoder included in the measuring device 7, and based on the average rotation speed f and torque T, the acquired power P [mW] of the rotating part 10 = 2 x π x f×T was calculated.

As the shielding plate 20, an acrylic plate having a thickness of 20t and 5 mm as shown in FIGS. 6(a) and 6(b) was used. For the shielding plates 20, Examples 1 to 10 were set using the number of installed shield plates, installation angle, length 20L, and installation position as conditions. Furthermore, as a comparative example, conditions were set in which the shielding plate 20 was not installed.

[Table 1] shows the results of evaluating the maximum acquired power (power [mW]) and the load torque [mNm] at that time for each condition of the shielding plate 20. Each condition and evaluation result in [Table 1] corresponds to the graphs in FIGS. 9 to 12, respectively. Furthermore, for Comparative Example 1 and Example 1, particle image velocimetry (PIV) was performed. Regarding the conditions for the installation position of the shielding plate 20, the case where the downstream end of the shielding plate 20 is installed with approximately 6 mm protruding into the region of the downstream DS (see FIG. 6(a)) is defined as "position A". ”. That is, when viewed from the width direction X, the case where the first main surface 20a of the shielding plate 20 overlaps the rotation axis C was defined as "position A." Furthermore, the case where the downstream end of the shielding plate 20 was installed in the upstream US region (see FIG. 6(b)) was defined as "position B."

First, as for the results of particle image velocimetry, Comparative Example 1 corresponds to FIG. 7, and Example 1 corresponds to FIG. 8. The measurement results show the local flow velocity vector at a specific time as an arrow, and the vorticity strength as a shade of color, with the darker the color, the stronger the vortex strength. Note that the positional relationship between the rotating part 10 and the shielding plate 20 in FIG. 8 is the same as that in FIG. 6(a), and the wings 11 and the shielding plate 20 are provided as a guide.

Regarding Comparative Example 1, as shown in FIG. 7, the vortex strength was strong in the region P of the downstream DS. On the other hand, in Example 1, as shown in FIG. 8, the vortex strength was weaker in region P of the downstream DS than in Comparative Example 1. Therefore, it was confirmed that the vortex strength in the region P was weakened by installing the shielding plate 20, and the generation of vortices was suppressed.

Next, for Examples 1 to 2 and Comparative Example 1, the power relative to the number of shielding plates 20 installed was evaluated. Note that the condition for the number of sheets of 1 corresponds to the installation position of the first shielding plate 20f described above, and the condition for the number of sheets of 2 corresponds to the installation position of the first shielding plate 20f and the second shielding plate 20s shown in FIG. 4. As a result, Example 2, Example 1, and Comparative Example 1 exhibited higher power in this order. That is, as the number of installed shielding plates 20 increases, the obtained power tends to increase.

Next, for Examples 3 to 5, the power with respect to the installation angle [θ] of the shielding plate 20 was evaluated. As a result, Example 5, Example 4, Example 3, and Comparative Example 1 showed higher power in this order. That is, there was a tendency for the power obtained to increase as the installation angle increased.

Next, for Examples 6 to 8, the power with respect to the length of the shielding plate 20 of 20 L [mm] was evaluated. Note that the downstream end of the shielding plate 20 was unified at "position A." As a result, Example 8, Example 7, Example 6, and Comparative Example 1 exhibited higher power in this order. That is, as the length 20L of the shielding plate 20 increases, the obtained power tends to increase.

Next, for Examples 9 and 10, the power relative to the installation position of the shielding plate 20 was evaluated. As a result, Example 10, Example 9, and Comparative Example 1 exhibited higher power in this order. That is, compared to the case where the downstream end of the shielding plate 20 was set at "position B," the obtained power tended to be higher when it was set at "position A."

As shown above, the results of the particle image velocimetry method in Example 1 confirmed that the provision of the shielding plate 20 suppressed the generation of vortices. Furthermore, the evaluation results of Examples 1 to 10 showed that higher power than Comparative Example 1 could be obtained in all cases.

Although an embodiment of the invention has been described, this embodiment is presented by way of example and is not intended to limit the scope of the invention. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

1 : Power generation device 10 : Rotating part 11 : Wings 12 : Support part 13 : Shaft 20 : Shield plate 20a : First main surface 30 : Generator 5 : Breakwater 51 : Slit 52 : Water retarding chamber 7 : Measuring device 8 : Evaluation Device 81: Evaluation section 82: Path 83: Pump 100: Wave power generation system A: Sending section B: Return section C: Rotating shaft DS: Downstream US: Upstream X: Width direction Y: Channel direction Z: Height direction

Claims (8)

A power generation device that generates electricity using a flow of fluid,
a rotating part having a Savonius-type structure;
a shielding plate provided apart from the rotating part and having a first main surface facing the rotating part;
Equipped with
The rotating part is
a feeding section that rotates from upstream to downstream of the fluid;
a return part that rotates from the downstream to the upstream;
has
The power generation device is characterized in that the shielding plate is inclined with respect to the flow path direction of the fluid and is provided close to the return section in the upstream. The power generating device according to claim 1, wherein the length of the shielding plate is equal to or longer than the length of the rotating portion in a height direction along the rotation axis of the rotating portion. A wave power generation system that uses water that enters the slits of a breakwater to generate electricity,
Equipped with the power generation device according to claim 1 or 2,
The wave power generation system is characterized in that the power generation device is provided in a slit of the breakwater or a water retarding chamber connected to the slit of the breakwater. The wave power generation system according to claim 3, wherein the shielding plate is provided at an angle of 20 degrees or more and 40 degrees or less with respect to the flow path direction. The wave power generation system according to claim 3, wherein the shielding plate is provided to overlap the rotating section when viewed from the flow path direction. The wave power generation system according to claim 3, wherein the first main surface of the shielding plate overlaps with the rotation axis of the rotating section when viewed from the width direction perpendicular to the flow path direction. The shielding plate is
a first shielding plate provided close to the return section in the upstream;
a second shielding plate provided close to the feeding section in the downstream;
The wave power generation system according to claim 3, comprising: The wave power generation system according to claim 7, wherein the first shielding plate and the second shielding plate are provided at different angles with respect to the flow path direction.

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