A submerged dike oscillating water column type wave-breaking power generation device

Abstract

The present invention relates to the field of offshore engineering and specifically discloses a submerged dike oscillating water column type wave-breaking power generation device, which includes a power generation device body and an L-shaped submerged dike. The power generation device body includes an air chamber and an air turbine. The air chamber is a square hollow cylinder with an opening at the bottom end and an air hole at the top end. The air turbine is arranged in the air hole and converts the kinetic energy of the air flowing through the air hole into electrical energy. The air chamber is fixed to an offshore platform, the air hole is arranged above the sea surface, and the opening is arranged below the sea surface. The seawater forms a water column in the air chamber. The L-shaped submerged dike is arranged below the air chamber, the horizontal side of the L-shaped submerged dike is flat on the seabed, and the vertical side of the L-shaped submerged dike is perpendicular to the seabed and located on the side of the rear wall of the air chamber. The present invention not only significantly enhances the wave-breaking performance of the device under full wave cycles, effectively protecting the coast from erosion, but also utilizes the wave reflection characteristics of the submerged dike to improve the energy conversion efficiency of the oscillating water column wave energy power generation device under long wave cycles.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore engineering, and in particular to a submerged dike oscillating water column type wave-breaking and power generation device. Background Art

[0002] As a clean energy source, wave energy offers broad application prospects due to its pollution-free, renewable nature, abundant reserves, and widespread distribution. Wave energy conversion and utilization technologies include various approaches, including oscillating water column, oscillating float, and overboard wave-riding. Among them, the oscillating water column wave energy power generation device, due to its simple structure and high reliability, has attracted the attention of scholars both domestically and internationally, and has demonstrated significant potential for commercial application.

[0003] During the interaction between waves and oscillating water column wave energy power generation devices, part of the wave energy will be transmitted through the device, part will be reflected by the device, part will be captured by the device and converted into electrical energy, and part of the energy will be gradually dissipated in the form of vorticity. Due to the multi-stage energy conversion involved in the operation process, traditional oscillating water column wave energy power generation devices often face the problem of low power generation. At the same time, the high construction cost of a single wave energy device makes its commercial application difficult. Therefore, in recent years, many scholars have been committed to combining oscillating water column wave energy power generation devices with other offshore structures to build an integrated system. This strategy aims to improve power generation performance while effectively reducing construction costs, opening up new avenues for the commercial application of wave energy power generation technology. Summary of the Invention

[0004] The present invention aims to solve the problem of low conversion efficiency of conventional oscillating water column wave energy power generation devices and to address the phenomenon of wave erosion on the coast. To this end, a submerged dike oscillating water column wave-proof power generation device is provided.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] A submerged dike oscillating water column type wave-breaking power generation device, which includes a power generation device body and an L-shaped submerged dike, the power generation device body including an air chamber and an air turbine, the air chamber being a square hollow cylinder, the bottom end of the air chamber being provided with an opening, the top end of the air chamber being provided with an air hole, the air turbine being arranged in the air hole and converting the kinetic energy of the air flowing through the air hole into electrical energy; the air chamber being fixed on an offshore platform, the air hole being arranged above the sea surface, the opening being arranged below the sea surface, and the seawater forming a water column in the air chamber; the L-shaped submerged dike being arranged below the air chamber, the horizontal side of the L-shaped submerged dike being flat on the seabed, and the vertical side of the L-shaped submerged dike being perpendicular to the seabed and located on the side close to the rear wall of the air chamber.

[0007] As a preferred embodiment of the present invention, the relationship between the chamber width b of the air chamber, the draft a of the air chamber and the wavelength L of the waves is b / L= 0.3612exp(-18.97a / L).

[0008] As a preferred embodiment of the present invention, the ratio of the horizontal distance L1 from the vertical side of the L-shaped submerged dike close to the horizontal side to the rear wall of the air chamber to the chamber width b of the air chamber is L1 / b=0-0.1.

[0009] As a preferred embodiment of the present invention, the ratio of the height r of the vertical side of the L-shaped submerged dike to the distance from the seabed to the bottom end of the air chamber is r / (da) = 0.3~0.5; wherein d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber.

[0010] As a preferred solution of the present invention, the ratio of the horizontal distance L2 from one end of the horizontal side of the L-shaped submerged dike away from the vertical side to the vertical side of the L-shaped submerged dike close to the horizontal side to the chamber width b of the air chamber is L2 / b=1~1.2.

[0011] As a preferred embodiment of the present invention, the ratio of the thickness w of the horizontal side of the L-shaped submerged dike to the distance from the seabed to the bottom end of the air chamber is w / (da) = 0.05~0.08; wherein d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber.

[0012] The submerged dike oscillating water column type wave-breaking power generation device provided by the present invention has the following beneficial effects compared with the prior art:

[0013] The present invention combines an oscillating water column wave energy generator with an L-shaped submerged dike. This not only significantly enhances the device's wave protection performance over the full wave cycle, effectively preventing wave scour and coastal damage, but also leverages the L-shaped dike's wave-reflecting properties. Through this reflection, wave energy from deepwater areas is effectively channeled into the air chamber, thereby improving the device's energy conversion efficiency under long wave cycles. The dike's L-shaped vertical edges effectively block wave energy from deepwater areas from transmitting through the device and successfully guide wave energy into the air chamber. The horizontal edges not only stabilize the dike but also generate vorticity through shear flow between the fluid and the dike's plane, further guiding wave energy into the air chamber. Thus, by effectively reducing the transmittance of long-period waves, the device provides robust coastal protection. Suitable for shallow coastal areas, it maximizes the use of wave energy while simultaneously demonstrating excellent wave protection and protecting the coast from erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments are briefly introduced below.

[0015] Figure 1 2 is a schematic structural diagram of a submerged dike oscillating water column type wave-breaking and power generation device according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic structural diagram of the power generation device body in an embodiment of the present invention;

[0017] Figure 3 A comparison chart of the energy conversion efficiency of the submerged dike oscillating water column type wave-breaking power generation device according to an embodiment of the present invention and a conventional oscillating water column device;

[0018] Figure 4 This is a comparison chart of the transmission coefficients of the submerged dike oscillating water column type wave-breaking power generation device according to an embodiment of the present invention and a traditional oscillating water column device.

[0019] Reference numerals:

[0020] 1. Power generation device body; 11. Air chamber; 12. Air turbine; 13. Opening; 14. Air hole; 2. L-shaped submerged dike; 21. Horizontal edge; 22. Vertical edge. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a submerged dike oscillating water column type wave-breaking power generation device, which includes a power generation device body 1 and an L-shaped submerged dike 2. The power generation device body 1 includes an air chamber 11 and an air turbine 12. The air chamber 11 is a square hollow cylinder. The bottom end of the air chamber 11 is provided with an opening 13, and the top end of the air chamber 11 is provided with an air hole 14. The air turbine 12 is arranged in the air hole 14 and converts the kinetic energy of the air flowing through the air hole 14 into electrical energy. When in use, the air chamber 11 is fixed on an offshore platform, the air hole 14 is arranged above the sea surface to connect to the outside atmosphere, the opening 13 is arranged below the sea surface, and the seawater forms a water column in the air chamber 11. The L-shaped submerged dike 2 is arranged below the air chamber 11, and the horizontal side 21 of the L-shaped submerged dike 2 is flat on the seabed. The vertical side 22 of the L-shaped submerged dike 2 is perpendicular to the seabed and is located on the side close to the rear wall of the air chamber 11 (that is, the side facing the coast).

[0026] When power generation device 1 is in operation, air turbine 12 is located in air hole 14, using the air in air chamber 11 as the intermediate carrier for energy conversion. Wave motion drives the water column in air chamber 11 to oscillate up and down, causing the gas in air chamber 11 to expand and compress. This generates a reciprocating airflow at air hole 14, driving air turbine 12 mounted there to rotate, thereby generating electricity. The entire device has no key structures that require movement underwater, so problems such as seawater corrosion and marine organism adhesion do not affect the device's operation. This further improves the reliability and stability of the device's overall structure, thereby reducing maintenance costs.

[0027] The submerged dike oscillating water column wave-breaking and power generation device operates as follows: When a wave propagates, some of the wave energy near the waterline is captured by the generator body 1, some is transmitted through the generator body 1, some is blocked and reflected back by the generator body 1, and some is dissipated as vorticity. In deep water, the vertical edge 22 of the L-shaped submerged dike 2 blocks the wave energy in the deep water area and guides it into the air chamber 11. Meanwhile, the horizontal edge 21 of the L-shaped submerged dike 2, through shearing interaction with the fluid, creates vorticity, which helps guide the wave energy into the air chamber 11. The wave energy entering the air chamber 11 is converted into electrical energy through multiple stages of energy conversion.

[0028] Furthermore, in order to ensure the ability of the power generation device body 1 to capture wave energy, the relationship between the chamber width b of the air chamber 11, the draft a of the air chamber 11 and the wavelength L of the wave is b / L= 0.3612exp(-18.97a / L).

[0029] Furthermore, in order to better prevent wave energy in deep water areas from transmitting through the device and ensure that the wave energy is induced into the air chamber 11, the ratio of the horizontal distance L1 from the vertical side 22 of the L-shaped submerged dike 2 close to the horizontal side 21 to the rear wall of the air chamber 11 to the chamber width b of the air chamber 11 is L1 / b = 0~0.1; the ratio of the height r of the vertical side 22 of the L-shaped submerged dike 2 to the distance from the seabed to the bottom end of the air chamber 11 is r / (da) = 0.3~0.5; wherein d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber 11.

[0030] Furthermore, in order to improve the stability of the L-shaped submerged dike 2 and the shear effect between the L-shaped submerged dike 2 and the fluid, the ratio of the horizontal distance L2 from the horizontal side 21 of the L-shaped submerged dike 2 away from the end of the vertical side to the vertical side 22 of the L-shaped submerged dike 2 close to the horizontal side 21 to the chamber width b of the air chamber 11 is L2 / b=1~1.2; the ratio of the thickness w of the horizontal side 21 of the L-shaped submerged dike 2 to the distance from the seabed to the bottom end of the air chamber 11 is w / (da) = 0.05~0.08; wherein d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber 11.

[0031] Figure 3 A comparison of the efficiency of a submerged dike oscillating water column wave-break power generation device and a traditional oscillating water column wave energy power generation device is shown. When the wave period is short, the efficiency of the two models is similar. However, when the wave period is long, the power generation efficiency of the submerged dike oscillating water column wave-break power generation device is significantly better than that of a single device.

[0032] Figure 4 A comparison chart of the transmission coefficients of the submerged dike oscillating water column wave-breaking power generation device and the traditional oscillating water column wave energy power generation device is shown. Under the full wave cycle, the wave-breaking performance of the submerged dike oscillating water column wave-breaking power generation device is better than that of the traditional oscillating water column wave energy power generation device.

[0033] In summary, according to an embodiment of the present invention, a submerged dike oscillating water column wave-breaking power generation device is provided. It combines an oscillating water column wave energy power generation device with an L-shaped submerged dike. This not only significantly enhances the device's wave-breaking performance over the entire wave cycle, effectively preventing wave scouring and damage to the coast, but also utilizes the wave-reflecting properties of the L-shaped submerged dike. Through the reflection of the dike, the wave energy in the deep water area is effectively guided into the air chamber, thereby improving the energy conversion efficiency of the oscillating water column wave energy power generation device under long wave cycles. The dike is L-shaped, and its vertical edges effectively block the wave energy in the deep water area from transmitting through the device and successfully guide the wave energy into the air chamber. The horizontal edges not only serve to fix the dike, but also form vorticity through the shear flow between the fluid and the dike plane, further guiding the wave energy into the air chamber. As a result, by effectively reducing the transmittance of long-period waves, the device can provide solid protection for coastal areas. It is suitable for coastal areas with shallow water depths, can maximize the utilization of wave energy, and at the same time, has excellent wave-breaking performance, protecting the coast from erosion.

[0034] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A submerged dike oscillating water column type wave-breaking power generation device, characterized in that: The invention comprises a power generation device body and an L-shaped submerged dike. The power generation device body comprises an air chamber and an air turbine. The air chamber is a square hollow cylinder with an opening at the bottom end and an air hole at the top end. The air turbine is arranged in the air hole and converts the kinetic energy of the air flowing through the air hole into electrical energy. The air chamber is fixed to an offshore platform, the air hole is arranged above the sea surface, and the opening is arranged below the sea surface. The seawater forms a water column in the air chamber. The L-shaped submerged dike is arranged below the air chamber, with the horizontal side of the L-shaped submerged dike flat on the seabed and the vertical side of the L-shaped submerged dike perpendicular to the seabed and located on the side close to the rear wall of the air chamber. The relationship between the chamber width b of the air chamber, the draft a of the air chamber and the wavelength L of the ocean wave is b / L=0.3612exp(-18.97a / L); The ratio of the horizontal distance L1 between the vertical side of the L-shaped submerged dike close to the horizontal side and the rear wall of the air chamber and the chamber width b of the air chamber is L1 / b=0-0.1; The ratio of the height r of the vertical side of the L-shaped submerged dike to the distance from the seabed to the bottom end of the air chamber is r / (da) = 0.3~0.5; where d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber.

2. The submerged dike oscillating water column type wave-breaking power generation device according to claim 1, characterized in that: The ratio of the horizontal distance L2 between the end of the horizontal side of the L-shaped submerged dike away from the vertical side and the vertical side of the L-shaped submerged dike close to the horizontal side to the chamber width b of the air chamber is L2 / b=1~1.

2.

3. The submerged dike oscillating water column type wave-breaking power generation device according to claim 1, characterized in that: The ratio of the thickness w of the horizontal side of the L-shaped submerged dike to the distance from the seabed to the bottom end of the air chamber is w / (da) = 0.05~0.08; where d is the distance from the seabed to the sea surface, and a is the draft depth of the air chamber.

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