TWI638096B - Wave electricity generation system - Google Patents

Abstract

The present invention provides a wave power generation system capable of maintaining static stability while improving power generation efficiency. The wave power generation system is a wave power generation system that can be used together with a breakwater to dissipate the energy of the wave and generate power by the energy of the wave, and includes a rotating body array and a generator. The breakwater is a breakwater that is provided in the water and does not penetrate the wall, but does not have a penetrating front wall on the sea side that does not penetrate the wall. The rotator row is formed by a plurality of rotators arranged along the extending direction of the non-penetrating wall on the side of the sea that does not penetrate the wall. The generator converts rotational energy of the plurality of rotating bodies into electric power.

Description

Wave power system

The present invention relates to a wave power generation system that dissipates the energy of a wave and generates electricity by the energy of the wave.

In recent years, attention has been focused on the use of renewable energy (natural energy) for the resolution of environmental problems such as depletion of fossil fuels and global warming. The wave power generation among these is a system that utilizes the wave force generated in the sea covering an area of 70% of the earth's surface, and focuses on using it as an effective energy source.

However, from the point of view of the safety of the ship and the securing of the fishery, there are cases where the installation of structures in the sea is severely restricted, and it is difficult to install a wave power generation system. In view of such problems, Patent Document 1 discloses a wave power generation system in which a water wheel is installed in a swimming pool in which a seawall is installed in a harbor. In other words, the wave power generation system of Patent Document 1 is capable of making it easy to use the existing harbor infrastructure, and it is possible to reduce the cost of separately adding the power generation device and the power transmission device.

However, in Patent Document 1, a breakwater having a front wall that does not penetrate the wall and has a penetrating property of a longitudinal slit on the side of the sea is used. Such a breakwater ensures the static stability of the bank side by reflecting waves not penetrating the wall, and dissipates the energy of the wave by a vortex generated in the vicinity of the longitudinal slit of the front wall. borrow In this way, the reflectance of the wave that does not penetrate the wall is lowered, and the static stability of the sea side can be ensured not only on the side of the bank but also on the side of the ship or the like.

However, the dissipation of the wave energy by the penetrating front wall is imaginable from the point of view of the wave elimination, but it is not efficient from the viewpoint of power generation.

<Patent Document 1> JP-A-2013-2410

It is an object of the present invention to provide a wave power generation system that can maintain static stability and improve power generation efficiency.

A wave power generation system according to a first aspect of the present invention is a wave power generation system that can share energy with a breakwater, dissipate waves, and generate electric power using the energy of the wave, and includes a rotating body array and a generator. The aforementioned breakwater is a breakwater that is disposed in the water and has a front wall that does not penetrate the wall but does not have penetrability on the side of the sea that does not penetrate the wall. The rotating body array is a plurality of rotating bodies arranged on the side of the sea that does not penetrate the wall, and is arranged in a direction in which the non-penetrating wall extends in a plane view. The generator converts rotational energy of the plurality of rotating bodies into electric power.

Here, on the sea side of the breakwater that does not penetrate the wall, the penetrating front wall is not provided, and the rotating body array is provided instead. Thereby, the energy of the wave which is dissipated by the vortex in the vicinity of the water permeable hole (slit) of the front wall can be effectively applied to the rotation of the rotating body. In other words, it is possible to dissipate the energy of the wave of the rotational energy of the rotating body from the viewpoint of the wave-cutting, and from the viewpoint of power generation, it is possible to prevent energy loss due to excessive vortex generation. Lost. Therefore, it is possible to maintain the static stability, and it is possible to use the energy of the wave which is intended to be dissipated by the conventional technology as the energy source for power generation, thereby improving the power generation efficiency.

A wave power generation system according to a second aspect of the present invention is the wave power generation system according to the first aspect, wherein an adjacent rotating system included in the rotating body row is configured to rotate in an opposite direction.

Thereby, the operation of the adjacent rotating body can be prevented, and the water flow can be smoothly passed through the rotating body array. Thereby, the power generation efficiency can be further improved.

A wave power generation system according to a third aspect of the present invention is the wave power generation system according to the first aspect or the second aspect, further comprising at least one of the first flow regulating member and the second flow regulating member. The rotation axis of the adjacent rotating body included in the rotator row is an inflow region through which the wave that flows into the non-penetrating wall side from the sea side passes, or the above-mentioned never penetrates the wall side The outflow area through which waves from the sea side pass. The inflow region and the outflow region are each formed by at least one of them. The first flow regulating member is disposed in the vicinity of the sea side of the outflow region, and introduces a wave that flows into the non-penetrating wall from the sea side into the inflow region. The second flow regulating member is disposed in the vicinity of the non-penetrating wall side of the inflow region, and introduces a wave that flows out from the non-penetrating wall side toward the sea side into the outflow region.

Thereby, the rotation axis of the adjacent rotating body becomes an inflow region or an outflow region of the wave. Further, when the adjacent rotating bodies included in the rotating body row are rotated in opposite directions, the inflow region and the outflow region are alternately formed. Further, by the first rectifying member, the desired inflow does not penetrate the wall side. The inflow region is introduced, and/or the desired flow from the non-penetrating wall side is introduced into the outflow region by the second flow regulating member. In other words, the first rectifying member can not introduce the wave which is intended to flow into the inflow region, and/or the second rectifying member can stop the wave which is desired to flow out. Import the outflow area. Thereby, the power generation efficiency can be further improved.

A wave power generation system according to a fourth aspect of the present invention is the wave power generation system according to the third aspect, wherein the rotating body included in the rotating body row is a position corresponding to the inflow region and the outflow region The corresponding positions are arranged at different intervals.

A wave power generation system according to a fifth aspect of the present invention is the wave power generation system according to any one of the first aspect to the fourth aspect, wherein the rotator included in the rotator row is arranged at unequal intervals With.

A wave power generation system according to a sixth aspect of the present invention is the wave power generation system according to any one of the first aspect to the fifth aspect, further comprising: extending from the non-penetrating wall in a horizontal direction and supporting the foregoing The upper part of the rotating body.

Thereby, since the non-penetrating wall, the rotating body, and the like can be unitized, the installation work can be easily performed on the spot.

A wave power generation system according to a seventh aspect of the present invention is the wave power generation system according to any one of the first aspect to the fifth aspect, further comprising a caisson. The caisson has a bottom portion and an upper wall portion extending from the lower portion and the upper portion of the non-penetrating wall and the non-penetrating wall to the side of the sea.

The wave power generation system according to the eighth aspect of the present invention is the related wave power generation system according to any one of the first to seventh aspects, wherein further The base is provided with a base that can be disposed in the rotating body row, and the base is provided such that the water depth of the installation position of the rotating body row is shallower than the water depth of the position on the sea side.

Thereby, the installation position of the rotating body is raised by the susceptor, and the rotating body is provided at a position where the water level is lower (lighter) than the position where the sea level is located. Therefore, in this case, the traveling speed of the wave passing through the rotating body becomes fast, and the energy dispersion of the wave becomes large. Therefore, the reflectance of the wave can be reduced.

A wave power generation system according to a ninth aspect of the present invention is the wave power generation system according to the eighth aspect, wherein the susceptor has a vertical surface facing the side of the sea.

Thereby, the water pump is formed in the vicinity of the sea side, and the height difference of the water depth is rapidly changed, so that the flow rate of the inflowing wave becomes fast. Thereby, the reflectance of the wave can be further reduced, and the power generation efficiency can be further improved.

A wave power generation system according to a tenth aspect of the present invention is the wave power generation system according to any one of the first aspect to the ninth aspect, wherein the rotating body is a waterwheel that does not rotate in a certain direction according to a direction of the wave. .

Thereby, the rotating body rotates in the same direction even when the wave impact does not penetrate the wall, or even if the wave exits without penetrating the wall. Thereby, the power generation efficiency can be further improved.

A wave power generation system according to a tenth aspect of the present invention is the wave power generation system according to the tenth aspect, wherein the rotating body is a barrel waterwheel.

In this way, the bucket-shaped waterwheel can be used as a rotating body. Therefore, it is possible to construct a power generation system which can generate a large torque even with a low rotation and which is easy to operate even at a low flow rate.

A wave power generation system according to a twelfth aspect of the present invention is the wave power generation system according to any one of the first aspect to the eleventh aspect, wherein the rotation axis of the rotating body extends in a vertical direction. In addition, in the case of describing "vertical direction" in the present specification, unless otherwise specified, it is set to include a case where it is completely parallel to the vertical direction and a case where it is substantially perpendicular to the vertical direction.

Thereby, it is possible to easily install the generator at an appropriate position such as on the water.

According to the present invention, not only from the viewpoint of noise cancellation, the energy of the wave can be dissipated as the rotational energy of the rotating body, and energy loss can be prevented from the viewpoint of power generation. Therefore, the static stability can be maintained, and the energy of the wave that is intended to be dissipated by the conventional technology can be utilized as an energy source for power generation, thereby improving power generation efficiency.

1, 101, 201, 301‧‧‧ wave power generation system

2‧‧‧Waterwheel column (rotating body column)

3‧‧‧Generator

10‧‧‧Do not penetrate the wall

11, 11A, 11B‧‧‧ base (step)

12‧‧‧ Roof section (upper wall)

13‧‧‧ bottom

20, 120‧‧‧Waterwheel (rotating body)

20A, 20B, 20C‧‧‧ barrel waterwheel

120A‧‧‧1st waterwheel

120B‧‧‧2nd waterwheel

21, 121‧‧‧ rotating shaft

118‧‧‧Inflow area

119‧‧‧ outflow area

150, 250, 350‧‧‧1st rectifying member

160, 260, 360‧‧‧2nd rectifying member

Fig. 1 is a longitudinal sectional view showing a wave power generation system according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view taken along line II-II of Figure 1.

Fig. 3 is a longitudinal sectional view showing a wave power generation system according to a second embodiment of the present invention.

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

Fig. 5 is a cross-sectional view showing a wave power generation system according to a third embodiment of the present invention.

Fig. 6 is a cross-sectional view showing a wave power generation system according to a fourth embodiment of the present invention.

Fig. 7 is a cross-sectional view showing a wave power generation system according to a modification.

Fig. 8 is a longitudinal sectional view showing a wave power generation system according to another modification.

Fig. 9 is a longitudinal sectional view showing a wave power generation system according to still another modification.

Fig. 10 is a side view of an experimental apparatus including the wave power generation system related to Embodiment 1.

Fig. 11A is a plan view of the wave power generation system according to the first embodiment (in the case of Ds = 0.084 m).

Fig. 11B is a plan view of the wave power generation system related to the first embodiment (in the case of Ds = 0.140 m).

Fig. 11C is a plan view of the wave power generation system related to the first embodiment (in the case of Ds = 0.102 m).

Figure 12 is a side elevational view of the power measuring system included in the experimental apparatus of Example 1.

Fig. 13A is a graph showing a comparison result of reflectances in Example 1 (dot) and Comparative Example (curve) (in the case of Ds/h = 0.215).

Fig. 13B is a graph showing a comparison result of reflectances in Example 1 (dot) and Comparative Example (curve) (in the case of Ds/h = 0.350).

Fig. 13C is a graph showing a comparison result of reflectances in Example 1 (dot) and Comparative Example (curve) (in the case of Ds/h = 0.525).

Fig. 14A is a graph showing the relationship between the reflectance and the load torque in Example 1 (in the case of Ds/h = 0.215).

Fig. 14B is a graph showing the relationship between the reflectance and the load torque in Example 1 (in the case of Ds/h = 0.350).

Fig. 14C is a graph showing the relationship between the reflectance and the load torque in the embodiment 1. Line graph (in the case of Ds/h = 0.525).

Fig. 15A is a graph showing the power obtaining efficiency in Example 1 (in the case of Ds/h = 0.215).

Fig. 15B is a graph showing the power obtaining efficiency in Example 1 (in the case of Ds/h = 0.350).

Fig. 15C is a graph showing the power obtaining efficiency in Example 1 (in the case of Ds/h = 0.525).

Fig. 16A is a graph showing the rotational speed of the waterwheel in the first embodiment (in the case of Ds/h = 0.215).

Fig. 16B is a graph showing the rotational speed of the waterwheel in the first embodiment (in the case of Ds/h = 0.350).

Fig. 16C is a graph showing the rotational speed of the waterwheel in the first embodiment (in the case of Ds/h = 0.525).

Figure 17 is a plan view (top view) and a side view (bottom view) of the experimental apparatus including the wave power generation system of the second embodiment.

Figure 18A is a front elevational view of a wave power generation system related to Embodiment 2.

Figure 18B is a plan view of a wave power generation system related to Embodiment 2.

Fig. 19A is a graph showing a comparison result of reflectances in Example 2 and Comparative Example (in the case of l' = 0.24 m).

Fig. 19B is a graph showing the results of comparison of reflectances in Example 2 and Comparative Example (in the case of l' = 0.34 m).

Fig. 19C is a graph showing the results of comparison of reflectances in Example 2 and Comparative Example (in the case of l' = 0.44 m).

Figure 20A is a relationship between the energy conversion efficiency and the load torque in the second embodiment. Line graph (Example 2).

Fig. 20B is a graph showing the relationship between the energy conversion efficiency and the load torque in the second embodiment (Example 3).

Figure 21 is a graph showing the passage of reflectance and the maximum flow rate of the water plant in Example 2.

Fig. 22A is a graph showing the primary conversion efficiency in the second embodiment (in the case of l/l' = 0.91).

Fig. 22B is a graph showing the primary conversion efficiency in the second embodiment (in the case of l/l' = 0.45).

Hereinafter, a wave power generation system according to a plurality of embodiments of the present invention will be described with reference to the drawings.

<1. First embodiment> <1-1. Composition of wave power generation system>

The wave power generation system 1 according to the first embodiment is shown in Figs. 1 and 2 . 1 is a longitudinal sectional view of a wave power generation system 1; and FIG. 2 is a sectional view taken along line II-II of FIG. 1. The wave power generation system 1 is a structure that is installed in the sea and has a function as a breakwater and a function as a power generation system. As shown in FIGS. 1 and 2, the wave power generation system 1 includes a water train row 2 (rotating body array) that does not penetrate the wall 10 and is disposed on the sea side that does not penetrate the wall 10. The non-penetrating wall 10 extends in a direction intersecting the traveling direction of the wave and is disposed to be separated from the side of the bank and the side of the sea. The waterwheel row 2 is constructed by arranging a plurality of waterwheels 20 (rotating bodies) in an extending direction of the non-penetrating wall 10 in a plan view. As shown in FIG. 2, when the plurality of waterwheels 20 constituting the waterwheel row 2 are rotated When the shafts 21 are joined into a line, they are substantially parallel to the non-penetrating wall 10 in plan view.

As shown in FIG. 1, the non-penetrating wall 10 is a rectangular flat plate which is provided on the base 11 formed on the sea floor and which is erected from the base 11 in the vertical direction. From the upper portion of the wall 10, the roof portion 12 (upper wall portion) having a rectangular shape is perpendicular to the non-penetrating wall 10, and protrudes toward the side of the sea; never penetrates the lower portion of the wall 10. From the side of the sea, the bottom portion 13 is formed to be perpendicular to the non-penetrating wall 10 so as to be perpendicular to the non-penetrating wall 10. That is, the roof portion 12 and the bottom portion 13 are expanded in the horizontal direction. The bottom portion 13 is provided on the base 11, and integrally forms a non-penetrating wall 10 and a roof portion 12 integrally with the bottom portion 13. The water wheel 20 according to the present embodiment has a rotating shaft 21 extending in the vertical direction, and a lower portion of the rotating shaft 21 is rotatably fixed to the bottom portion 13. A generator 3 is disposed at a lower portion of the roof portion 12; an upper portion of the rotating shaft 21 rotatably receives the generator 3. The non-penetrating wall 10 and the roof portion 12 and the bottom portion 13 constitute a caisson, for example, made of concrete. The base 11 can also be made of concrete.

The susceptor 11 serves to stably support the caisson and the waterwheel row 2, but it is also possible to reduce the reflectance of the waves. Moreover, power generation efficiency can also be improved. That is, since the installation position of the water wheel 20 is raised by the base 11 (and the bottom portion 13), the water wheel 20 is placed at a low (shallow) position of the water level; in this case, the wave between the waterwheels 20 is passed. The speed of travel becomes faster, and the energy dissipation of the wave becomes larger. The susceptor 11 of the present embodiment expands between the non-penetrating wall 10 and the waterwheel row 2, and the water tank row 2 is inclined downward toward the sea side from the vicinity of the sea side.

The non-penetrating wall 10 is a structure that constitutes a breakwater and serves as a character that reflects a wave from the side of the sea and returns it to the side of the sea. The non-penetrating wall 10 has a vertical surface on the side of the sea. Although the water level of the sea surface changes with the tidal rise and fall and weather conditions, the height of the non-penetrating wall 10 related to the present embodiment is Under normal meteorological conditions, it exceeds the sea level at any time. Moreover, the non-penetrating wall 10 and the waterwheel row 2 are arranged such that they are disposed at a constant interval as in the water storage chamber.

The waves that arrive at the waterwheel row 2 from the side of the sea are reflected by the waterwheel train 2 and are not reflected by the wall 10 . Then, the reflected wave passes through the waterwheel row 2 again and returns to the side of the sea. During this period, due to the action of the waves passing through the water train 2, the waterwheel 20 is rotated separately, and the energy of the waves is converted into the rotational energy of the waterwheel 20. That is, the waterwheel row 2 serves as a wave breaker that does not penetrate the wall 10 and dissipates the energy of the wave. In addition, as shown in the above, although the water tank row 2 is provided, the front wall of the water permeable row of the conventional water permeable hole is not provided (see Patent Document 1). In this sense, the waterwheel train 2 can be said to be a substitute for the penetrating front wall used in conventional breakwaters.

The water wheel 20 according to the present embodiment is a water wheel that does not rotate in a certain direction without the direction of the wave. Therefore, even in the case of a shock wave that does not penetrate the wall 10, even if the wave is exited, each of the waterwheels 20 rotates in the same direction to supply power. Further, as shown in Fig. 1, each of the waterwheels 20 according to the present embodiment has a plurality of buckets (three stages in the present embodiment) which are stacked on the upper and lower sides of the common rotating shaft 21. 20A~20C. Thus, the water wheel 20 has a general property as a bucket-shaped waterwheel, and has a property of easily generating a large torque with low rotation and being easy to operate at a low flow rate. Further, in other embodiments, each of the waterwheels 20 can be configured in one piece. In the waterwheel 20 according to the present embodiment, at least one of the bucket-shaped waterwheels 20A to 20C that are arranged in the vertical direction under normal weather conditions is disposed at any time below the sea surface. Therefore, the wave power generation system 1 is not affected by the fluctuation of the wave, and the entire water wheel 20 can be rotated frequently.

As shown in Fig. 2, the bucket-shaped waterwheels 20A to 20C according to the present embodiment each have two water-cooling wings 22 which are semi-circular in cross section. These two water blade 22 are arranged to have a positional relationship that overlaps with the other when the one is rotated 180 degrees around the circumference of the rotating shaft 21. Moreover, the water-vehicle wing 22 of the barrel-shaped waterwheel which is adjacent to the up-and-down direction is a position which is arrange|positioned only by the predetermined angle vicinity with the rotation shaft 21, and the rotation of the whole waterwheel 20 is smooth. Further, in the present embodiment, such a deviation angle is set by dividing 360° by 120° obtained by 3 of the number of bucket-shaped waterwheels, so that the smoothness of rotation is optimized.

Further, as shown in FIG. 2, the adjacent two waterwheels 20 included in the waterwheel row 2 according to the present embodiment are configured to rotate in opposite directions. That is, in the waterwheel row 2, the waterwheel 20 that rotates clockwise and the waterwheel 20 that rotates counterclockwise are arranged alternately. As a result, the waves can interfere with the movement of the waterwheel 20 or interfere with the flow of the water flow between the adjacent waterwheels 20, and can smoothly pass through the waterwheel row 2. Further, the plurality of waterwheels 20 included in the waterwheel row 2 have the same structure except that the rotation directions of the adjacent two waterwheels are different.

In addition, the two adjacent water tanks included in the waterwheel row 2 are configured to rotate in opposite directions (hereinafter, they are configured to rotate differently from each other), and the wave power generation system 1 according to the present embodiment can be used. Various wave power generation systems. For example, even in the water tank column disposed in the swimming pool of the breakwater having the penetrating front wall in the sea side which does not penetrate the wall as described in Patent Document 1, it is possible to apply to each other. Not the same rotation.

As described above, when the water wheel 20 rotates due to the action of the wave, the generator 3 receives the rotational force through the rotating shaft 21 to generate electric power. In addition, the composition of a generator that converts the rotational energy of a waterwheel into electric power is well known. Therefore, detailed description thereof is omitted herein. The generator 3 can be converted into electric power as long as it can convert the rotational energy of the rotating shaft 21, regardless of its configuration. The arrangement of the generator 3 is also the same, and is not limited to the upper side of the rotating shaft 21, and may be provided at any position.

Further, the electric power generated by the generator 3 is transmitted to a substation on the land side or the like by a power transmission device (not shown). Since the wave power generation system 1 is usually installed in the offshore due to the function of the breakwater, it is possible to suppress power loss due to power transmission.

As described above, via the wave power generation system 1, the energy of the wave is efficiently converted into the rotational energy of the waterwheel 20, which is converted into electric power by the generator 3. Therefore, the energy of the wave can be dissipated, the wave can be effectively performed, and the power can be efficiently generated from the energy of the wave.

<1-2. Features>

In the wave power generation system 1, in the seawall on the side of the sea that does not penetrate the wall 10, the penetrating front wall is omitted and the waterwheel row 2 is provided instead. Therefore, the energy of the wave is not dissipated as the conventional wave power generation system having the penetrating front wall, and is not dissipated by the vortex generated in the vicinity of the water permeable hole of the front wall, so that it can be utilized efficiently The rotation of the waterwheel column 2. That is, from the viewpoint of the wave elimination, even if the energy of the wave which uses the rotational energy of the waterwheel row 2 is dissipated, it is possible to prevent the energy loss due to the occurrence of the vortex from the viewpoint of power generation. Thereby, the wave power generation system 1 can maintain static stability and can improve power generation efficiency.

The wave power generation system 1 can be implemented as a harbor facility such as a fishing port, a commercial port, and a refuge port. In addition, the wave power system 1, if it is due to the existing defense When there is a need for replacement due to deterioration of the bank, etc., it is also possible to achieve a relatively smooth introduction target.

<2. Second embodiment>

Next, the wave power generation system 101 according to the second embodiment will be described. 3 is a longitudinal sectional view of a wave power generation system 101; and FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. The wave power generation system 101 is a structure that is installed in the sea, has a function as a breakwater, and functions as a power generation system. The wave power generation system 1 according to the first embodiment is common to many features. In the following, the same components as those in the first embodiment will be described with the same reference numerals, and the detailed description thereof will be omitted.

In addition to the first embodiment, the wave power generation system 101 includes the non-penetrating wall 10, the roof portion 12 (upper wall portion), the bottom portion 13, the susceptor 11, the waterwheel row 2, and the generator 3. The flow regulating member 150 and the second flow regulating member 160. The main difference between the wave power generation system 101 according to the present embodiment and the wave power generation system 1 according to the first embodiment is the presence or absence of the first flow regulating member 50 and the second flow regulating member 60.

In the same manner as in the first embodiment, the waterwheel row 2 according to the second embodiment is configured such that a plurality of waterwheels 120 (rotating bodies) are separated from the wall 10 by a predetermined interval, and are in plan view. Arranged along the direction in which the wall 10 is not penetrated. However, each of the waterwheels 120 is different from the first embodiment, and the bucket-shaped waterwheel is not formed in a plurality of stages formed in the vertical direction but in a one-stage configuration. However, the bucket-shaped waterwheel 120 of the second embodiment can also be configured in a plurality of stages.

The waterwheel 120 has an upper shaft 131 in order from the top in the up and down direction. The wing portion 132 and the shaft lower portion 133. The wing portion 132 is a water wing 136 including an upper flange 134, a lower flange 135, and a pair.

Each water wheel 136 has a semi-cylindrical shape; the water wheel 120 has a barrel shape, and the two water-powered wings 136 are symmetrically arranged to rotate 180° with respect to the rotating shaft 121 of the waterwheel 120. Therefore, similarly to the first embodiment, the water wheel 120 can also rotate in only one direction. Each of the water heater blades 136 has an upper flange 134 connected to the upper end portion and a lower flange 135 connected to the lower end portion. Although the outer flanges of the two flanges 134 and 135 are reached, they do not protrude outward from the outer circumference. Moreover, the upper portion of the water wheel 136 is often exposed above the water surface 114 even above normal weather conditions. The shaft upper portion 131 and the shaft lower portion 133 are parallel to the non-penetrating wall 10 and are disposed from a distance that does not penetrate the wall 10 by a predetermined distance.

The center of the upper surface of the upper flange 134 is a lower end portion coupled to the upper portion 131 of the shaft; the upper portion 131 of the shaft is coaxial with the upper flange 134. The shaft upper portion 131 extends in the vertical direction, and the upper end portion thereof is inserted into the through hole 115 provided in the roof portion 12 and rotatably supported by the shaft. Similarly, the center of the lower surface of the lower flange 135 is coupled to the upper end portion of the lower shaft portion 133, and the lower shaft portion 133 and the lower flange 135 are coaxial. The lower shaft portion 133 extends in the vertical direction, and the lower end portion thereof is rotatably supported by the shaft receiving hole 116 provided in the upper surface of the bottom portion 13.

Further, as shown in FIG. 4, the adjacent two waterwheels 120 according to the present embodiment are also configured to rotate in opposite directions. In other words, the waterwheel 120 that rotates counterclockwise in plan view (hereinafter sometimes referred to as the first waterwheel 120A) and the waterwheel that rotates clockwise around the plane (hereinafter sometimes referred to as the second The waterwheels 120B) are alternately arranged along the direction in which the waterwheels 120 are arranged. When viewed in cross section, the adjacent first waterwheel 120A and second waterwheel 120B have relative to the water tankers 120A, 120B. The rotating shaft 121 has a line symmetrical shape in a straight line of equal distance. When the waves pass between the waterwheel rows 2, the two watercraft wings 136 of the first waterwheel 120A are each pressed, so that the first waterwheel 120A rotates counterclockwise in plan view. Similarly, the two watercraft wings 136 of the second waterwheel 120B are also pressed against each other, so that the second waterwheel 120B rotates clockwise in a plan view.

As described above, the directions of rotation of the adjacent waterwheels 120, 120B are reversed from each other. Therefore, between the rotating shaft 121 of the adjacent first waterwheel 120A and the rotating shaft 121 of the second waterwheel 120B, the inflow region 118 through which the wave F1 flows from the side of the sea into the side that does not penetrate the wall 10, Or the wave F2 never passes through the wall side to the outflow region 119 through which the sea side flows out. The inflow region 118 and the outflow region 119 are alternately formed along the arrangement direction of the waterwheel 120.

In the present embodiment, the first rectifying members 150 are formed in plural numbers to form a row, and the second rectifying members 160 are also present in plural numbers to form a row. Each of the first flow regulating member 150 and the second flow regulating member 160 extends in the vertical direction, and the individual upper end portions are fixed to the lower surface of the roof portion 12, and the individual lower end portions are fixed to the upper surface of the bottom portion 13. The first rectifying member 150 and the second rectifying member 160 have a rectangular parallelepiped shape; as shown in FIG. 4, the cross section (cross section in the horizontal direction) has a square shape. The dimensions of the diagonal of the square cross section of the first flow regulating member 150 and the second flow regulating member 160 are almost the same as the diameters of the upper flange 134 and the lower flange 135 of the water wheel 120.

The first rectifying member 150 is disposed in the vicinity of the sea side of the outflow region 119, and one of the four vertices of the cross section (hereinafter referred to as the first vertex 151) faces the outflow region 119 side. More specifically, the first rectifying member 150 is disposed such that the imaginary line 142 passing through the first vertex 151 of the first rectifying member 150 and the second vertex 152 of the diagonal passing through the imaginary line segment 141 is arranged in a cross-sectional view. of At or near the midpoint, the imaginary line segment 141 passes through a line segment of a point corresponding to the rotation axis 121 of the adjacent first waterwheel 120A and second waterwheel 120B, respectively. The imaginary line 142 and the imaginary line segment 141 are perpendicular to each other. The first vertex 151 is closer to the sea side than the imaginary line segment 141, but the first rectifying member 150 is inserted into the gap formed between the adjacent first waterwheel 120A and the second waterwheel 120B.

The second flow regulating member 160 is disposed in the vicinity of the non-penetrating wall 10 side of the inflow region 118, and one of the four vertices of the cross section (hereinafter referred to as the first vertex 161) faces the inflow region 118 side. More specifically, the second rectifying member 160 is disposed such that the imaginary line 144 passing through the second vertex 162 diagonal to the first vertex 161 of the second rectifying member 160 in the cross-sectional view will pass through: The midpoint of the imaginary line segment 143 at a point corresponding to the rotation axis 121 of the adjacent first waterwheel 120A and the second watercraft 120B or its vicinity. The imaginary line 144 and the imaginary line segment 143 are perpendicular to each other. The first vertex 161 is closer to the side of the wall 10 than the imaginary line 143, but the second rectifying member 160 is inserted into the gap formed between the adjacent waterwheels 120.

Next, a description will be given of a configuration in which the wave power generation system 101 generates power for the wave while eliminating waves. As shown in FIG. 4, the wave F1 that has flowed into the non-penetrating wall 10 side strikes a corner portion of the first rectifying member 150 disposed on the downstream side of the outflow region 119 corresponding to the second vertex 152 located on the side of the sea, and The inflow region 118 is introduced into the left and right (the upper and lower directions in FIG. 4, the same applies hereinafter). Then, the wave F1 squeezes the inner circumferential surfaces of the water wheel 136 of the first water wheel 120A and the second water wheel 120B to rotate the water heaters 120A and 120B. At this time, the first waterwheel 120A rotates counterclockwise in plan view, and the second waterwheel 120B rotates clockwise. After the first waterwheel 120A and the second waterwheel 120B are rotated, the wave F1 hits the downstream side of the inflow region 118. The rectifying member 160 has a corner portion corresponding to the first vertex 161 located on the side of the sea, and flows into the outflow region 119 without being deposited.

In addition, the wave F2 that has flowed out from the side of the penetrating wall 10 hits a corner portion of the second rectifying member 160 disposed on the downstream side of the inflow region 118 corresponding to the second vertex 162 located on the side of the non-penetrating wall 10, and It is divided into left and right introduction and outflow areas 119. Then, the wave F2 squeezes the inner circumferential surfaces of the water heater blades 136 of the first waterwheel 120A and the second waterwheel 120B to rotate the water tankers 120A and 120B. At this time, the first waterwheel 120A rotates counterclockwise in plan view, and the second waterwheel 120B rotates clockwise. After the first waterwheel 120A and the second waterwheel 120B are rotated, the wave F2 hits an angle corresponding to the first vertex 151 located on the side of the non-penetrating wall 10 of the first flow regulating member 150 on the downstream side of the outflow region 119. The Ministry, but did not stop to flow out to the side of the sea.

In this way, the entire inflowing waves F1 and F2 can be introduced into the inflow region 118 and the outflow region 119 by the first flow regulating member 150 and the second flow regulating member 160, and the first water wheel 120A and the second water wheel 120B can be oriented in a single direction. Rotate. That is, such a breakwater can convert the energy of most waves into the rotational energy of the waterwheel 120 and eliminate it. Further, although the waves F1 and F2 are introduced into the inner circumferential surface of the water blade 136 of the water wheel 120 by the first flow regulating member 150 and the second flow regulating member 160, the unguided water flows to the outer circumferential surface of the water wheel 136. There is no resistance to the rotation of the waterwheel 120.

When the water wheel 120 rotates as described above, the generator 3 receives the rotational force via the shaft upper portion 131 to generate electric power. Further, as shown in FIG. 3, in the present embodiment, the generator 3 is disposed on the roof portion 12. However, similarly to the first embodiment, the generator 3 may be disposed below the roof portion 12. In this embodiment, Also in the same manner as in the first embodiment, the arrangement and configuration of the generator 3 can be appropriately selected. The electric power generated by the generator 3 can be transmitted to a substation on the land side or the like via a power transmission device (not shown). In addition, the non-penetrating wall 10 can also be placed in contact with or substantially in contact with the coast 125 as shown in FIG.

<3. Third embodiment>

Next, the wave power generation system 201 according to the third embodiment will be described. FIG. 5 is a cross-sectional view of the wave power generation system 201. The wave power generation system 201 has a plurality of points common to the wave power generation systems 1 and 101 according to the first and second embodiments. In the following description, the same reference numerals are given to the same components as those of the first and second embodiments, and the detailed description thereof will be omitted.

The wave power generation system 201 includes the non-penetrating wall 10, the roof portion 12 (upper wall portion), the bottom portion 13, the susceptor 11, the water wheel train 2, and the generator 3, similarly to the first and second embodiments. Further, the first rectifying member 250 and the second rectifying member 260 are provided. The main difference between the wave power generation system 201 according to the present embodiment and the wave power generation system 101 according to the second embodiment is the distance between the waterwheels 120 included in the water train row 2.

More specifically, in the present embodiment, substantially no gap is formed between the adjacent first waterwheel 120A and the second waterwheel 120B. With this arrangement, it is possible to reduce the amount of waves that smoothly slide the waterwheels 120A and 120B through the gap between the first waterwheel 120A and the second waterwheel 120B. That is, it is possible to improve power generation efficiency.

In the present embodiment, the first rectifying member 250 is plural. The columns are formed; and the second rectifying members 260 are also present in plural numbers to form columns. In comparison with the first and second flow regulating members 150 and 160 according to the second embodiment, the first and second flow regulating members 250 and 260 have different cross-sectional shapes, and have the same points at the remaining points. Composition.

As shown in FIG. 5, the cross-sectional shape of the first rectifying member 250 has a shape of four vertices surrounded by a pair of adjacent curved lines 253 and a pair of adjacent line segments 254. The first rectifying member 250 is disposed in the vicinity of the sea side of the outflow region 119, and the intersection of a pair of curved lines 253 (hereinafter referred to as a first vertex 251) of one of the four vertices of the cross section is oriented Outflow area 119 side. The second vertex 252 is the intersection of a pair of line segments 254. More specifically, the first rectifying member 250 is disposed such that the imaginary line 242 of the first vertex 251 of the first rectifying member 250 and the second vertex 252 of the diagonal passing through the cross section will pass through: The point of the imaginary line segment 241 corresponding to the point corresponding to the rotation axis 121 of the adjacent first waterwheel 120A and the second waterwheel 120B or the vicinity thereof. Further, the imaginary line 242 and the imaginary line segment 241 are perpendicular to each other. The first vertex 251 is closer to the sea side than the imaginary line segment 241, but the first rectifying member 250 is inserted into the gap formed between the adjacent waterwheels 120. Among the four vertices of the cross section of the first rectifying member 250, the remaining dimension between the apexes of the first vertex 251 and the second vertex 252 is the upper flange 134 and the lower flange 135 of the waterwheel 120. The diameter is almost the same. In the cross section of the first flow regulating member 250, a curve 253 extending from a corner portion corresponding to the first vertex 251 in the left-right direction (the same direction in the vertical direction in FIG. 5, the same applies hereinafter) is the upper flange 134 of the water wheel 120 and The center of the lower flange 135 is concentric, and is only slightly curved like a large diameter.

The cross-sectional shape of the second rectifying member 260 has a pair of adjacent connections The shape of the curve 263 and the four vertices surrounded by a pair of adjacent line segments 264. The second flow regulating member 260 is disposed in the vicinity of the non-penetrating wall 10 side of the inflow region 118, and one of the four vertices of the cross section is the intersection of the pair of curves 263 (hereinafter referred to as the first vertex 261). Towards the inflow area 118 side. The second vertex 262 is the intersection of the pair of line segments 264. More specifically, the second flow regulating member 260 is disposed such that the imaginary line 244 passing through the first vertex 261 of the second rectifying member 260 and the second vertex 262 of the diagonal passing through in the cross section will pass: The midpoint of the imaginary line segment 243 at a point corresponding to the rotation axis 121 of the adjacent first waterwheel 120A and the second waterwheel 120B or its vicinity. Further, the imaginary line 244 and the imaginary line segment 243 are perpendicular to each other. The first vertex 261 is closer to the side of the wall 10 than the imaginary line 243, but the second rectifying member 260 is inserted into the gap formed between the adjacent waterwheels 120. Among the four vertices of the cross section of the second rectifying member 260, the remaining between the apexes of the first vertex 261 and the second vertex 262 is the same as the upper flange 134 and the lower flange 135 of the water wheel 120. The diameter is almost the same. In the cross section of the second flow regulating member 260, the curve 263 extending from the corner portion corresponding to the first vertex 261 in the left-right direction (the same direction in the lower direction in FIG. 5, the same applies hereinafter) is the upper flange of the water wheel 120. The center of the 134 and the lower flange 135 are concentric, and only slightly larger than the diameter of the arc.

According to the above configuration, the wave power generation system 201 according to the third embodiment can improve the power generation efficiency more than the wave power generation systems 1 and 101 already described.

<4. Fourth embodiment>

Next, a wave power generation system 301 according to the fourth embodiment will be described. FIG. 6 is a cross-sectional view of the wave power generation system 301. Wave power generation system 301 is the first to third There are many points in the implementation of the related wave power generation systems 1, 101, 201 that are common. In the following description, the same reference numerals are given to the same components as those in the first to third embodiments, and the detailed description thereof will be omitted.

The wave power generation system 301 includes the non-penetrating wall 10, the roof portion 12 (upper wall portion), the bottom portion 13, the susceptor 11, the waterwheel train 2, and the generator 3, similarly to the first to third embodiments. The first flow regulating member 350 and the second flow regulating member 360 are provided. The main difference between the wave power generation system 301 according to the present embodiment and the wave power generation systems 101 and 202 according to the second and third embodiments is the distance between the waterwheels 120 included in the waterwheel row 2.

More specifically, in the wave power generation system 301, the water tanks 120 included in the water train row 2 are arranged at unequal intervals. In particular, in the present embodiment, the water tanks 120 included in the waterwheel row 2 are arranged at positions different from each other at intervals corresponding to the inflow region 118 at positions corresponding to the outflow region 119. The interval between the adjacent waterwheels 120 at the position corresponding to the outflow region 119 is wider than the interval between the adjacent waterwheels 120 of the position corresponding to the inflow region 118, or may be opposite to that shown in FIG. The composition.

In the present embodiment, since the breakwater does not have a penetrating front wall on the side of the sea that does not penetrate the wall 10, the degree of freedom in the installation position of the waterwheel 120 is high. Therefore, it is possible to determine, in each installation place, the inflow amount and the outflow amount of the wave into and out of the breakwater such as to increase the power generation efficiency, and separately set each of the adjacent waterwheels 120 included in the waterwheel row 2 interval. In particular, it is particularly meaningful to be able to separately set the interval between the positions corresponding to the inflow region 118 and the position corresponding to the outflow region 119.

<5. Modifications>

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. For example, the following changes can be made. Further, the gist of the following modifications can be appropriately combined.

<5-1>

In the above embodiment, the barrel type waterwheel is used as the rotating body. However, the present invention is not limited thereto, and other types of waterwheels can be used. However, from the viewpoint of power generation efficiency, it is preferable to use a waterwheel that can easily generate electricity in the case of a shock wave or a retreating wave, and does not rotate in a certain direction with the direction of the wave. An example of a waterwheel such as this is, in addition to a bucket-shaped waterwheel, for example, a staggered flow waterwheel. Moreover, in the waterwheel of the above-described embodiment, it is also possible to use a waterwheel that is deformed to have a water blade having a different number of three or four sheets.

<5-2>

In the above-described embodiment, the waterwheel row 2 is configured to be different from each other, and is not limited thereto. For example, all of the waterwheels 20 may be rotated in the same direction.

<5-3>

In the above embodiment, although the rotating shaft of the waterwheel is supported by the shaft above and below, only the upper portion or the lower portion may be supported by the shaft.

<5-4>

In the above embodiment, the rotating shaft of the waterwheel is directly connected to the generator, but may be indirectly connected to the generator by another device such as a hydraulic pump.

<5-5>

In the second to fourth embodiments, the central wing portion of the rotating shaft is disposed to be divided into upper and lower portions, but may be inserted through the wing portion 132.

<5-6>

In the second to fourth embodiments, although the upper portion of the wing portion 132 is electrically higher than the water surface, it may be such that it is often immersed in water.

<5-7>

In the above embodiment, the wave power generation system is installed in the sea, but may be installed in rivers, lakes, and the like.

<5-8>

In the second to fourth embodiments, either of the first rectifying member and the second rectifying member may be omitted.

<5-9>

In the above embodiment, the sea side of the susceptor 11 is formed to be formed in Inclined slope in the vertical direction. However, instead of the susceptor 11, a susceptor 11A having a vertical surface 111A on the side of the sea as shown in Fig. 8 may be provided. Further, the susceptor 11B may be further formed on the bottom portion 13 provided on the susceptor 11 as shown in FIG. The base 11B of Fig. 9 is a base having a rectangular parallelepiped shape which is formed only below the waterwheel 20 and does not reach the wall 10 when viewed in a longitudinal direction. The seat 11B is used as a pedestal that does not penetrate the wall 10. Further, as shown in the present modification, the base is not formed in a trapezoidal shape as shown in FIG. 1 but in a rectangular shape when viewed in a longitudinal section, and is directly under the waterwheel 20 and on the side of the sea. The height difference between the water depth changes sharply in the vicinity, and the wavelength of the inflowing wave changes to make the flow velocity fast. Therefore, in such a case, the effect of reducing the reflectance of the wave and the effect of improving the power generation efficiency can be expected to be further improved.

[Example 1]

Hereinafter, the first embodiment of the present invention will be described. However, the present invention is not limited to the following embodiment 1.

<1. Experimental conditions>

Here, a wave power generation system as shown in FIG. 10 was used as the first embodiment using a wave-making water tank. Specifically, the size of the wave-making water tank is a length of 20.00 m, a width of 0.50 m, a height of 0.50 m, and a constant value of water depth h = 0.40 m. A wave-making plate is provided on one end side (by the sea side) in the longitudinal direction of the wave-making water tank, and the rotation axis of the water-vehicle is positioned to be separated from the wave-making plate to the other end side (the bank side) by 13.68 m. To set up the waterwheel column. Each of the waterwheels included in the waterwheel row is a bucket-shaped waterwheel constructed in the same manner as the one described in the first embodiment. In addition, three types of waterwheel trains are prepared, and the diameter Ds [m] of each bucket water tank of each waterwheel train is set to Ds=0.084, 0.140, 0.210. The number of waterwheels included in the waterwheel row is related to the width of the wave-making water tank; in the case of Ds=0.084, it is set to 5 (see Fig. 11A); in the case of Ds=0.140, it is set to 3 (refer to Fig. 11B); The case of Ds=0.210 is set to two (refer to FIG. 11C). For each waterwheel row, rotation configurations different from each other are also set. The water workshop distance D=Ds+2a (2a is the distance between the wing ends of the adjacent waterwheels) is set to 2a/D=0.11 (certain value), and the waterwheel height Hw is set such that Hw/h is approximately 0.8. A certain value. Moreover, the non-penetrating wall is further provided from the side of the waterwheel column of 1 [m] = 0.38.

Further, in the wave power generation system related to the first embodiment, a power measurement system as shown in Fig. 12 is provided instead of the generator. The rotating shaft of the waterwheel (waterwheel shaft) is supported by the ball bearing shaft so that the friction is extremely rare to support the lower end. The upper end of the waterwheel shaft is connected to the magnetron brake pad, and the magnetic brake pad provides a load torque Tq [N. m]. The magnetron brake pad was made of Perma-Tork HC01-1 manufactured by Nippon Chuangcon Co., Ltd. Further, an accelerometer is fixed to the water wheel axle, and the rotational speed (angular velocity) RE [rps] of the waterwheel is measured between 30 seconds and 80 seconds after the start of the wave generation at the sampling frequency of 100 Hz. In addition, two displacement type height gauges were placed on the sea side about 3.5 m from the waterwheel axis to measure the water level fluctuation. In addition, a displacement type height gauge is provided on the sea side of 0.18 m from the waterwheel axis to measure the water level change in the vicinity of the waterwheel column. The sampling frequency of the wave height meter is set to 100 Hz. The action wave is set to a regular wave with a period T[s]=0.81~1.67 and a waveform gradient H/L=0.01. In addition, H is a wave height; L is a wavelength.

<2. Experimental results and evaluation> <2-1. Reflectance>

At Tq=1.1×10-3N. The reflectance Kr of the case of m is as shown in Fig. 13A to Fig. 13C. The result shown by "dot". 13A to 13C show data in the case of Ds/h=0.215, 0.350, and 0.525, respectively. In addition, the reflectance Kr is a result measured based on two volumetric wave height meters on the sea side of about 3.5 m from the waterwheel column, and is used. The reflection wave separation estimation method (Hita et al., 1976, Irregular Wave Into, Reflected Wave Separation Estimation Method, Harbor Technology Research Institute, No. 248) was calculated. Further, it is assumed that a model of a longitudinal slit upright wave breaker (comparative example) in which a cylindrical column is used instead of a waterwheel row (other conditions are the same as in the above-described first embodiment) is calculated based on a theoretical solution of the prior research. In the case of the reflectance Kr of the comparative example, the result is shown by "curve" in Figs. 13A to 13C. Further, the column of the columns in the comparison column is arranged at the same interval by the cylinders having the same diameter as the above-described waterwheel row.

13A to 13C, it is understood that the first embodiment has a tendency that the reflectance Kr of the comparative example is still low. This tendency is particularly remarkable on the short cycle side. This is conceivable because the water flow passes through the water tank below the water surface and a large shear flow occurs, resulting in energy loss. Further, it can be inferred that the larger the diameter Ds of the waterwheel is, the larger the area above the water tank becomes, and the more the wave energy is dissipated, resulting in a decrease in the reflectance Kr. That is, it can be understood that the wave elimination can be sufficiently performed by the waterwheel row even without providing the penetrating front wall. Moreover, it can be understood that in order to maintain the static stability of the sea area, the diameter of the waterwheel can be determined according to the water depth and the period of the wave. Moreover, when the diameter of the waterwheel is about 20% to 50% of the water depth, the reflectance of about 30% to 80% can be achieved; in particular, especially when the diameter of the waterwheel is about 50% of the water depth, It can also achieve a reflectivity of about 30% to 50%.

Further, in the wave power generation system according to the above-described embodiment, since the generator is mounted on the water wheel axle, the load (brake piece) of the generator is applied to the water wheel axle, and the rotation speed of the water wheel axle can be expected to be small. Therefore, in order to evaluate this effect, When the rotational speed RE and the reflectance Kr with respect to various load torques Tq are measured, the results shown in FIGS. 14A to 14C can be obtained. 14A to 14C show data in the case of Ds/h=0.215, 0.350, and 0.525, respectively.

14A to 14C, it is understood that when the load torque Tq is increased, although the rotational speed RE is collectively decreased, it is not found that the reflectance Kr is meaningfully changed. That is, it can be understood that the reflectance is not affected by the load of the generator, but can be determined according to the structural conditions (water depth, the diameter of the waterwheel, the period, the wavelength, and the like). Further, since the reflectance is not constant depending on the load of the generator, it is understood that the amount of energy dissipated due to the vortex formed around the waterwheel and the energy used to rotate the waterwheel are understood. The total amount of energy dissipated is a constant value regardless of the load of the generator.

<2-2. Gaining power>

When the obtained power efficiency Ke for the diameter Ds of various waterwheels is calculated according to the following formula, the results as shown in Figs. 15A to 15C can be obtained. 15A to 15C show data in the case of Ds/h=0.215, 0.350, and 0.525, respectively. The following Pp is the power obtained by the average unit width obtained by the rotation of the waterwheel; Pw is the energy of the wave of the average unit width. In addition, ρ is the density of water; g is the acceleration of gravity. Further, RE in the following formula is the average rotation speed.

[Number 1]

According to the past research, the power generation efficiency (acquisition power efficiency) for obtaining the energy of the wave using the barrel-shaped waterwheel is about 5%. On the other hand, it can be understood that the wave power generation system according to the first embodiment has the maximum value of the power efficiency Ke of 10% or more with respect to the diameter Ds of any waterwheel as shown in FIGS. 15A to 15C. It can be expected that the power generation efficiency is high.

Moreover, from the viewpoint of the stability of power generation, the fluctuation of the rotational speed of the waterwheel is required to be small. Therefore, when the relationship between the change η on the sea side from the waterwheel axis of 0.18 m and the rotational speed RE of the waterwheel is investigated, the results shown in Figs. 16A to 16C can be obtained. 16A to 16C show data in the case of Ds/h=0.215, 0.350, and 0.525, respectively.

As shown in FIG. 16A, in the case of Ds/h=0.215, the peak value of the second rotation speed appears for one wave. Such a tendency is thought to be that the rotational speed increases as the incident wave passes through the water train column, and increases as the reflected wave reflected by the penetrating wall propagates to the side of the sea. Further, as shown in FIG. 16B and FIG. 16C, as Ds/h becomes larger at 0.350 and 0.525, the fluctuation of the rotational speed RE also becomes smaller. That is, when the diameter of the waterwheel is large, once the waterwheel starts to rotate, the moment of inertia acts to make it difficult to receive the circumferential wave characteristics of the wave, and thus rotates at a stable speed. Therefore, from the viewpoint of the stability of power generation, it can be said that it is a waterwheel. The larger the diameter, the better; but the diameter of the waterwheel is preferably set to a size of more than 30% of the water depth; particularly preferably set to a size of 50% or more.

[Example 2]

Hereinafter, a second embodiment of the present invention will be described. However, the present invention is not limited to the following embodiment 2.

<1. Experimental conditions>

Here, the wave power generation system shown in Figs. 17, 18A, and 18B is formed using a wave-forming water tank as the second embodiment. Specifically, the size of the wave-making water tank is set to be 20.00 m in length, 0.50 m in width, and 0.60 m in height, and the maximum water depth h = 0.40 m is set to a constant value. A wave-making plate is provided on one end side (by the sea side) in the longitudinal direction of the wave-making water tank, and a rotating shaft of the water-vehicle row is provided at a position separated by about 14 m from the wave-making plate to the other end side (bank side). Further, the non-penetrating wall is further provided from the side of the rotation of the water train column of 1 [m]. The diameter of the barrel waterwheel is set to Ds[m]=0.072. The number of waterwheels included in the waterwheel train is set to six; the waterwheel train is configured to rotate differently when the adjacent waterwheels rotate in the opposite direction. Also, the water shop distance is set to D [m] = 1.1 Ds. Each of the water tanks included in the waterwheel train has a configuration in which the bucket-shaped waterwheel having the three-stage configuration described in the first embodiment is changed to a two-stage configuration. Further, from the non-penetrating wall to the sea side expansion l'[m], a step 11A of a rectangular parallelepiped having a width of the wave-forming water tank is prepared in the width direction, and a water train row is arranged on the step 11A.

Further, in the wave power generation system according to the second embodiment, instead of the generator, the same power measurement system as that of Fig. 12 is provided, and the load torque Tq [N. m]. Further, an electromagnetic flow meter manufactured by Alec Electronics Co., Ltd. was installed at a position of 0.08 m below the surface of the water in the water plant (on the side of the sea) to calculate the flow rate of the measuring water plant. also, The accelerometer (sensor controller) manufactured by ATR Co., Ltd., which is installed at the upper end of the water turbine shaft, is used to calculate the rotational speed ω of the water turbine at a sampling frequency of 100 Hz. In addition, two displacement type height gauges are placed on the side of the sea about 3.5 m from the rotating axis of the waterwheel, and are used. The reflection wave separation estimation method (Hita et al., 1976, Irregular Wave Into, Reflected Wave Separation Estimation Method, Harbor Technology Research Institute, No. 248) to obtain the incident wave wave height H[m] and reflectance Kr . Moreover, the conversion efficiency E can be obtained once, and the wave energy D which acts as a function relative to a waterwheel can be obtained. The ratio of Pω (Pω = ρgH2/8) to the obtained power P of the waterwheel is determined, and the energy conversion efficiency E'=E/Hs which is converted into the average unit length of the waterwheel is obtained. In addition, Hs[m] is the height of the waterwheel. A regular wave with a wave period T[s]=0.73~1.71 and a waveform gradient H/L=0.020. In addition, H is a wave height; L is a wavelength.

Next, conditions under which only the step 11A is satisfied (Example 1: Comparative Example), only the waterwheel row (Example 2: Example), and the step 11A and the waterwheel column shown in Fig. 17 are prepared In the following (Example 3: Example), l'=l+0.04 was set, and the experiment was performed while changing l=0.20 m, 0.30 m, and 0.40 m. Further, an experiment was performed by setting l' = 0.44 (certain value) and changing l/l'. Further, the wave power generation system of the first example is obtained by removing the waterwheel train from the wave power generation system of Fig. 17. Further, the wave power generation system of Example 2 is formed by removing the step 11A from the wave power generation system of Fig. 17 and changing the water train column of the two stages into three stages. The experimental conditions relating to hs/h in Examples 1 to 3 and the height Hs of the waterwheel are as follows. In addition, hs[m] is the water depth at the position where the waterwheel is installed.

<2. Experimental results and evaluation>

The step length (the length of the step 11A in the bank-shooting direction) l' is changed to the reflectance Kr of the case of l'=0.24, 0.34, 0.44m and the maximum flow velocity Vmax of the water shop (in the case of only the step 11A) The measured value of the installation position of the waterwheel is the result shown in Figs. 19A to 19C, respectively. The umax in the figure indicates the maximum velocity amplitude obtained by the small amplitude wave theory at a water depth h = 0.40 m. As can be understood from the same figure, in the example 1 having only the step 11A, the reflectance Kr has a tendency to be as high as 0.6 or more. In Example 2 where only the waterwheel column was used, the reflectance was lower than in Example 1 under any of the l' conditions. Further, it can be understood that in the example 3 in which the waterwheel row is provided on the step 11A, in the short period band, although Kr becomes almost the same as in the example 2, in the long period band, the tendency of Kr to be largely lowered is observed; the step 11A The longer the trend, the more pronounced it is. On the other hand, the Vmax/umax of Example 3 is still larger than the ratio of 2. Therefore, it is conceivable that by providing the water wheel on the step 11A, the flow rate through the water plant can be made faster, the energy dissipation becomes large, and the reflectance Kr is reduced.

From the above, it was confirmed that the reflectance Kr was the lowest in Example 3, the second lowest in Example 2, and the largest in Example 1. Therefore, it can be confirmed that the wave-carrying performance can be further improved in the case where the water-vehicle train is further provided on the step 11A by the water-vehicle train to improve the wave-breaking performance.

Figs. 20A and 20B show the energy conversion efficiency E' of Examples 2 and 3, respectively, when the step torque l' = 0.44 (constant value) is set to provide the load torque Tq. As can be understood from the same figure, the maximum value of E' in Example 3 is about 0.6; in Example 2, it is about 0.4; and the energy conversion efficiency E' in Example 3 is substantially higher than in the case of Example 2. Therefore, it can be understood that power generation efficiency can be improved by arranging the waterwheel row on the step 11A. In more detail, it can be understood that in the case where the water tank column is provided in addition to the step 11A, the energy conversion efficiency E' is substantially increased, and for any period of the wave, a certain load torque (Tq) The maximum energy conversion efficiency can be obtained almost all at =0.003N.m. This state of affairs means that the optimum load torque for efficiently obtaining energy is a constant value irrespective of the period of the target wave, and is designed for the design of the secondary conversion mechanism (the mechanism that activates the generator, etc.) It can be said that it is very useful knowledge.

Fig. 21 is a graph showing the reflectance Kr when changing to l/l' = 0.45, 0.68, 0.91 and the maximum flow velocity Vmax passing through the water plant under the condition of the step length l' = 0.44 (certain). It can be confirmed from the same figure that when l/l' becomes larger, that is, when the position of the waterwheel row is set to be on the sea side of the step 11A, the minimum value of Kr tends to become smaller. Therefore, it can be understood that from the viewpoint of the wave elimination, it is preferable that the water train row is arranged in the vicinity of the sea side end of the step 11A.

22A and 22B show the primary conversion efficiency E in the case of l/l' = 0.91 and 0.45, respectively. As can be seen from the same figure, the larger the l/l' becomes, that is, the closer the installation position of the waterwheel row is to the sea side of the step 11A, the greater the maximum value of the primary conversion efficiency E tends to become larger. Therefore, it can be understood that from the viewpoint of power generation efficiency, it is preferable that the water train row is arranged in the vicinity of the sea side end of the step 11A.

Claims (12)

A wave power generation system that can be disposed in water; although having a wall that does not penetrate, the aforementioned side of the sea that does not penetrate the wall can be used with a breakwater that does not have a penetrating front wall to make waves a wave power generation system in which energy is dissipated and power is generated by the energy of the wave; wherein the side of the sea that does not penetrate the wall is provided with a plurality of rotating bodies arranged along the extending direction of the non-penetrating wall in a plane view a rotating body array; a generator that converts rotational energy of the plurality of rotating bodies into electric power. In the wave power generation system according to claim 1, the adjacent rotating system included in the rotating body array is configured to rotate in the opposite direction. The wave power generation system according to claim 1 or 2, wherein the wave passing through the side of the non-penetrating wall passing through the sea side is passed between the rotation axes of the adjacent rotating bodies included in the rotating body row An inflow region or an outflow region through which the wave that flows out from the wall side to the sea side passes; the inflow region and the outflow region are each formed at least one, and the sea is disposed in the inflow region At least one of the following members: the first rectifying member is disposed in the vicinity of the sea side of the outflow region, and is attached to the inflow region from a wave that flows into the non-penetrating wall side from the sea side. And the second flow regulating member is disposed in the vicinity of the non-penetrating wall side of the inflow region, and introduces a wave that flows out from the non-penetrating wall side toward the sea side into the outflow region. The wave power generation system according to claim 3, wherein the rotation system included in the rotator row is arranged at intervals different from a position corresponding to the inflow region and a position corresponding to the outflow region. The wave power generation system according to claim 1 or 2, wherein the rotating bodies included in the rotating body row are arranged at unequal intervals. The wave power generation system according to claim 1 or 2, further comprising an upper wall portion that extends in the horizontal direction from the non-penetrating wall and supports the rotating body. The wave power generation system according to claim 1 or 2, further comprising a caissons having: said non-penetrating wall, and extending from a lower portion and an upper portion of said non-penetrating wall to a side of the sea Bottom and upper wall. The wave power generation system according to claim 1 or 2, further comprising: a base provided for the rotating body array, and the base is such that the water depth of the position of the rotating body is higher than the sea The water depth at one side is still shallow. The wave power generation system according to claim 8, wherein the pedestal has a vertical surface facing the sea side. The wave power generation system according to claim 1 or 2, wherein the rotating body is a waterwheel that does not rotate in a certain direction with the direction of the wave. The wave power generation system according to claim 10, wherein the rotating body is a bucket waterwheel. The wave power generation system according to claim 1 or 2, wherein the rotating shaft of the rotating body extends in a vertical direction.