Submerged dike oscillation water column type anti-wave power generation device

Abstract

The invention relates to the field of offshore engineering, and particularly discloses a submerged embankment oscillation water column type anti-wave power generation device which comprises a power generation device body and an L-shaped submerged embankment, the power generation device body comprises an air chamber and an air turbine, the air chamber is a square hollow column, an opening is formed in the bottom end of the air chamber, and an air hole is formed in the top end of the air chamber; the air turbine is arranged in the air hole and converts pneumatic energy flowing through the air hole into electric energy; the air chamber is fixed on the offshore platform, the air hole is formed above the sea surface, the opening is formed below the sea surface, and seawater forms a water column in the air chamber; the L-shaped submerged dike is arranged below the air chamber, the horizontal edge of the L-shaped submerged dike is horizontally placed on the seabed, and the vertical edge of the L-shaped submerged dike is vertical to the seabed and located on the side close to the rear wall of the air chamber. By the adoption of the oscillating water column wave energy power generation device, the wave prevention performance of the device in the full wave period is remarkably enhanced, the coast is effectively protected against erosion, and the energy conversion efficiency of the oscillating water column wave energy power generation device in the long wave period can be improved by means of the characteristic that the submerged breakwater reflects waves.

Description

Technical Field

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

[0002] As a clean energy, wave energy has shown a very broad application prospect with its advantages of being pollution-free, renewable, abundant in reserves and widely distributed. The wave energy conversion and utilization technology includes a variety of methods such as oscillating water column type, oscillating float type and wave crossing type. Among them, the oscillating water column type wave energy power generation device has attracted the attention of domestic and foreign scholars due to its simple structure and high reliability, and has shown great potential in commercial applications.

[0003] In the process of wave interaction with the oscillating water column wave energy power generation device, 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 and the like. 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 purpose of the present invention is to solve the problem of low conversion efficiency of traditional oscillating water column wave energy power generation devices and to deal with the erosion of the coast by waves. To this end, a submerged dike oscillating water column type 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, comprising a power generation device body and an L-shaped submerged dike, the power generation device body comprising 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 close to the rear wall side 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 solution of the present invention, the ratio of the distance L1 from the vertical side of the L-shaped submerged dike 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 embodiment of the present invention, the ratio of the distance L2 from the end of the horizontal side of the L-shaped submerged dike to the vertical side of the L-shaped submerged dike 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 power generation device with an L-shaped submerged dike, which not only significantly enhances the wave-proof performance of the device under the full wave cycle and effectively prevents the damage of the coast caused by wave scouring, but also utilizes the characteristics of the L-shaped submerged dike to reflect waves. Through the reflection of the submerged dike, the wave energy in the deep water area is effectively guided to the air chamber, thereby improving the energy conversion efficiency of the oscillating water column wave energy power generation device under long wave cycles. The submerged dike is L-shaped, and its vertical edge effectively blocks the wave energy in the deep water area from transmitting through the device, and successfully induces the wave energy to enter the air chamber; while the horizontal edge not only plays the role of fixing the submerged dike, but also forms vorticity through the shear flow between the fluid and the submerged dike plane, further inducing the wave energy to enter the air chamber. Therefore, the device can provide solid protection for the coastal area by effectively weakening the transmittance of long-period waves, is suitable for coastal areas with shallow water depths, can maximize the use of wave energy, and at the same time has excellent wave-proof performance to protect the coast from erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0015] Figure 12 is a schematic structural diagram of a submerged dike oscillating water column type wave-breaking power generation device according to an embodiment of the present invention;

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

[0017] Figure 3 A comparison diagram of energy conversion efficiency between 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 It is a comparison diagram 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 the 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 specific implementation of the present invention is further described in detail below in conjunction with 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., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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, a submerged dike oscillating water column type wave-breaking power generation device provided by an embodiment of the present invention 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, 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 pneumatic energy 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, the horizontal side 21 of the L-shaped submerged dike 2 is flat on the seabed, and the vertical side 22 of the L-shaped submerged dike 2 is vertical to the seabed and is located close to the rear wall side of the air chamber 11 (that is, the side in the coastal direction).

[0026] When the power generation device body 1 is in operation, since the air turbine 12 is arranged in the air hole 14, the air in the air chamber 11 is used as the intermediate carrier for energy conversion, and the wave movement drives the water column in the air chamber 11 to oscillate up and down, so that the gas in the air chamber 11 expands and compresses, thereby generating a reciprocating airflow at the air hole 14, driving the air turbine 12 installed at the air hole 14 to rotate, thereby generating electricity. The entire device has no key structure that needs to move underwater, and problems such as seawater corrosion and marine organism attachment will not affect the operation of the device, further improving the reliability and stability of the overall structure of the device, thereby reducing the maintenance cost of the entire device.

[0027] The working process of the submerged dike oscillating water column type wave-breaking power generation device is as follows: when the wave propagates, part of the wave energy near the waterline is captured by the power generation device body 1, part is transmitted through the power generation device body 1, part is blocked and reflected back by the power generation device body 1, and part is dissipated in the form of vorticity. In the deep water area, the vertical side 22 of the L-shaped submerged dike 2 blocks the wave energy in the deep water area and induces the wave energy to enter the air chamber 11; while the horizontal side 21 of the L-shaped submerged dike 2 forms vorticity through shearing action with the fluid, which assists in guiding the wave energy into the air chamber 11. The wave energy entering the air chamber 11 is converted into electrical energy through multi-stage 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 block the wave energy in the deep water area from transmitting through the device and ensure that the wave energy is induced into the air chamber 11, the ratio of the distance L1 from the vertical side 22 of the L-shaped submerged dike 2 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 distance L2 from the end of the horizontal side 21 of the L-shaped submerged dike 2 to the vertical side 22 of the L-shaped submerged dike 2 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 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 The efficiency comparison chart of the submerged dike oscillating water column wave-break power generation device and the traditional oscillating water column wave energy power generation device is shown. When the wave period is small, the efficiency of the two models is not much different. When the wave period is large, 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 type wave-breaking power generation device is provided, which combines an oscillating water column wave energy power generation device with an L-shaped submerged dike, which not only significantly enhances the wave-breaking performance of the device under the full wave cycle, effectively prevents the damage of the coast caused by wave scouring, but also utilizes the characteristics of the L-shaped submerged dike to reflect waves. Through the reflection of the submerged dike, the wave energy in the deep water area is effectively guided to the air chamber, thereby improving the energy conversion efficiency of the oscillating water column wave energy power generation device under long wave cycles. The shape of the submerged dike is L-shaped, and its vertical edge effectively blocks the wave energy in the deep water area from transmitting through the device, and successfully induces the wave energy to enter the air chamber; while the horizontal edge not only plays the role of fixing the submerged dike, but also forms vorticity through the shear flow between the fluid and the submerged dike plane, further inducing the wave energy to enter the air chamber. Therefore, the device can provide solid protection for the coastal area by effectively weakening the transmittance of long-period waves, is suitable for coastal areas with shallow water depths, can maximize the use of wave energy, and has excellent wave-breaking performance, protecting the coast from erosion.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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, wherein the power generation device body comprises an air chamber and an air turbine, wherein the air chamber is a square hollow cylinder, wherein the bottom end of the air chamber is provided with an opening, and the top end of the air chamber is provided with an air hole, and 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 on an offshore platform, the air hole is arranged above the sea surface, the opening is arranged below the sea surface, and 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 close to the rear wall 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 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).

3. The submerged dike oscillating water column type wave-breaking power generation device according to claim 1, characterized in that: The ratio of the distance L1 from the vertical side of the L-shaped submerged dike to the rear wall of the air chamber to the chamber width b of the air chamber is L1 / b=0-0.

1.

4. The submerged dike oscillating water column type wave-breaking power generation device according to claim 1, characterized in that: 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.

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

2.

6. 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; wherein 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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