Wave energy conversion type double-body semicircular dike and conversion method under various wave conditions

Abstract

The invention discloses a wave energy conversion type double semicircular breakwater and a conversion method under various wave conditions. The wave energy conversion type double semicircular breakwater comprises a first semicircular breakwater body and a second semicircular breakwater body which are overlapped front and back, a partition plate is arranged at the overlapping position in a downward extending mode, and an energy conversion module is arranged at the overlapping position upwards; the transduction module is communicated with the front air chamber; the first semicircular breakwater and the partition plate enclose to form a front air chamber, and the partition plate and the second semicircular breakwater enclose to form a rear air chamber; a narrow opening is formed in the partition plate, and the front air chamber and the rear air chamber are communicated through the narrow opening. A water inlet is formed in the outer wall of the front air chamber; an integrally-communicated guide pipe is arranged on the inner wall of the front air chamber, the partition plate and the inner wall of the rear air chamber, and one end of the guide pipe is communicated with multiple rows of small-diameter air holes formed in the upper portion of the outer wall of the front air chamber. Energy utilization of small waves and dissipation of mechanical energy of a water body during large waves are achieved, and the overtopping frequency of the embankment crest is reduced.

Description

Technical Field

[0001] The invention relates to the intersecting field of wave protection and wave energy generation, and in particular to a wave energy conversion type twin semicircular dike and a conversion method under various wave conditions. Background Art

[0002] In order to solve the wave protection problem in the port area, it is traditionally provided with protection by building sloped breakwaters or caisson-type vertical embankments. When the bottom of the port area is a soft environment such as soft soil or coral sand, the semicircular breakwater (semicircular breakwater for short) shows its application advantages due to its good anti-overturning and sliding capabilities, light embankment weight and better cross-sectional economy. However, the cross-sectional characteristics of the semicircular breakwater limit its protection against large waves. Large waves can easily climb up along the embankment surface, and the secondary waves formed by splashing behind the embankment will affect the stability of mooring in the port; in addition, since the semicircular breakwater is usually far away from the shore and the top of the embankment is not suitable for vehicles and personnel to pass, it will be difficult to power supply the lighting or monitoring equipment on the semicircular breakwater and nearby waters.

[0003] At present, the semicircular dike in China is mainly used in Tianjin Port (see Figure 1 ) and the Yangtze River Estuary, according to the Joint Analysis of Wave Height and Period in the Bohai Sea and the Northern Yellow Sea (see Figure 2 ) and other research results, the main characteristics of the wave height and period in the Bohai Sea area are: the wave height and period have an obvious linear correlation, the wave frequency of 0.0~1.0m wave height and 2.0~5.0s peak period is the highest, and the extreme wave conditions of 6.0~8.0s peak period and 2.0~3.0m wave height also have a certain probability of occurrence. Therefore, how to use the wave period characteristics to achieve the conversion of wave energy into electrical energy while breaking waves and consolidating embankments is a key issue that needs to be solved in this field. Summary of the invention

[0004] Therefore, the purpose of the present invention is to provide a wave energy conversion twin semicircular dike and a conversion method under various wave conditions, which solves the problems of poor wave dissipation performance and power supply difficulties on soft foundations through two approaches: wave energy conversion and wave energy dissipation of natural waves.

[0005] In order to achieve the above-mentioned object, the present invention provides a wave energy conversion twin semicircular dike, which is arranged on a base bed; the twin semicircular dike comprises: a first semicircular breakwater and a second semicircular breakwater overlapping front and back, and a partition extending downward at the overlap, and an energy conversion module is arranged upward at the overlap; the energy conversion module is communicated with the front air chamber; The first semicircular breakwater and the partition plate form a front air chamber, and the partition plate and the second semicircular breakwater form a rear air chamber; a narrow opening is provided on the partition plate, and the front air chamber and the rear air chamber are connected through the narrow opening; a water inlet is provided on the inner wall of the front air chamber for waves to propagate into the air chamber; an integrally connected conduit is arranged on the inner wall of the front air chamber, the partition plate and the inner wall of the rear air chamber, and one end of the conduit is connected to a plurality of rows of small-diameter air holes arranged on the upper part of the outer wall of the front air chamber.

[0006] Further preferably, the natural vibration period of the front air chamber is consistent with the designed small wave period, and the natural vibration period of the rear air chamber is consistent with the designed large wave.

[0007] Further preferably, the twin semicircular dikes are provided with front toes and rear toes at the front and rear dike feet, respectively, and the front toes and rear toes are used to increase the stability of the structure.

[0008] Further preferably, a one-way air intake valve is provided on the rear wall of the rear air chamber, and the one-way air intake valve is used to introduce ambient air into the air chamber.

[0009] Further preferably, the energy conversion module includes a protective shell, an air turbine, and a power transmission line. The protective shell is arranged at the intersection of a first semicircular breakwater and a second semicircular breakwater. The air turbine is arranged in the protective shell. A through hole is arranged at the connection between the first semicircular breakwater and the protective shell, and the air turbine is connected to the front air chamber through the through hole.

[0010] The present invention also provides a method for converting wave energy using a twin semicircular dike under various wave conditions, using the twin semicircular dike to convert wave energy; When the incident wave is a small wave, the small wave enters the front air chamber through the water inlet, oscillates in the front air chamber, and drives the air in the front air chamber to flow in and out. The energy conversion module captures the oscillating airflow in the front air chamber and converts the mechanical energy of the airflow oscillation into air turbine work to generate electricity; When the incident wave is a large wave, a part of the fluctuating water enters the front air chamber through the water inlet, and then passes through the narrow hole over the baffle into the rear air chamber, causing water oscillation in both the front and rear air chambers. During surges, the water level rises, and the air in the rear air chamber is squeezed into the duct, and is transmitted to the array holes on the front wall of the front air chamber through the duct to form a bubble air curtain. When the water level drops, the one-way air inlet valve on the rear wall of the rear air chamber introduces ambient air into the air chamber. Another part of the fluctuating water climbs along the outer wall of the first semicircular breakwater, and is affected by the bubble air curtain during the climbing process, dissipating part of the kinetic energy. Then the water body contacts the front wall of the second semicircular breakwater, dissipating part of the kinetic energy again.

[0011] The present application discloses a wave energy conversion twin semicircular breakwater and an energy conversion method. The two semicircular breakwaters are divided into two oscillating air chambers with a smaller front and a larger rear and connected at the bottom by a partition. The former has a natural vibration period that matches a small-period wave and converts wave energy into electrical energy during oscillation. The latter has a natural vibration period that matches a large-period wave and converts wave energy into bubble mechanical energy for preventing the propagation of incident waves in front of the breakwater during oscillation. On the other hand, the "m"-shaped structural profile with a smaller front and a larger rear can dissipate the mechanical energy of the water body during large waves and reduce the frequency of waves overtopping the breakwater crest. In addition, the semicircular twin breakwaters can ensure that the direction of wave pressure under any working condition passes through the center of the circle and does not generate overturning moment on the breakwater body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic structural diagram of the wave energy conversion twin semicircular dike provided by the present invention.

[0013] Figure 2 A midline cross-sectional view of the twin semicircular dikes provided by the present invention.

[0014] In the figure: 1. Front toe; 2. Water inlet; 3. Front air chamber; 4. First semicircular breakwater; 5. Second semicircular breakwater; 6. Transducer module; 7. Partition; 8. Narrow mouth; 9. Rear air chamber; 10. Inlet valve; 11. Rear toe; 12. Base bed; 13. Conduit; 14. Transmission line. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, an embodiment of the present invention provides a wave energy conversion twin semicircular dike, which is arranged on a base bed 12; the twin semicircular dike comprises: a first semicircular breakwater 4 and a second semicircular breakwater 5 which overlap front and back, and a partition is arranged extending downward at the overlap, and a transducer module 6 is arranged upward at the overlap; the transducer module 6 is connected to the front air chamber 3; during construction, enclosures are arranged on both sides of the twin semicircular breakwater.

[0017] The first semicircular breakwater 4 and the partition 7 enclose a front air chamber 3, and the partition 7 and the second semicircular breakwater 5 enclose a rear air chamber 9; the partition 7 is provided with a narrow opening 8, and the front air chamber 3 and the rear air chamber 9 are connected through the narrow opening 8; the outer wall of the front air chamber 3 is provided with a water inlet 2 for the propagation of waves into the air chamber; an integrally connected duct 13 is arranged on the inner wall of the front air chamber, the partition and the inner wall of the rear air chamber, and one end of the duct 13 is connected to a plurality of rows of small-diameter air holes arranged on the upper part of the outer wall of the front air chamber 3.

[0018] The self-oscillation period of the front air chamber is consistent with the designed small wave period, and the self-oscillation period of the rear air chamber is consistent with the designed large wave. The self-oscillation period of a wave is the time required for a single wave to complete one vibration, which can be calculated based on the wavelength and wave speed.

[0019] In order to enhance the stability of the twin semicircular dikes, a front toe 1 and a rear toe 11 are respectively provided at the front and rear footings of the dikes.

[0020] A one-way air intake valve 10 is provided on the rear wall of the rear air chamber 9, and the one-way air intake valve 10 is used to introduce ambient air into the air chamber.

[0021] The energy conversion module includes a protective shell, an air turbine, and a power transmission line 14. The protective shell is arranged at the intersection of the first semicircular breakwater 4 and the second semicircular breakwater 5. The air turbine is arranged in the protective shell. A through hole is arranged at the connection between the first semicircular breakwater 4 and the protective shell, and the air turbine is connected to the front air chamber through the through hole.

[0022] When the incident wave is a small wave, the small wave enters the front air chamber through the water inlet, oscillates in the front air chamber, and drives the air in the front air chamber to flow in and out. The energy conversion module captures the oscillating airflow in the front air chamber and converts the mechanical energy of the airflow oscillation into electrical energy for the air turbine to generate power. Therefore, a transmission line 14 is also arranged below the energy conversion module to transmit the converted electrical energy to the power consumption end.

[0023] When the incident wave is a large wave, a part of the fluctuating water enters the front air chamber through the water inlet, and then passes through the baffle from the narrow hole into the rear air chamber, causing water oscillation in both the front and rear air chambers. During surges, the water surface rises, and the air in the rear air chamber is squeezed into the duct. It should be noted that the duct height is recorded based on hydrological data, and the height of the average water level is set as the height of the duct outlet. When the wave water height is higher than the average water level, the gas in the rear air chamber is vibrated and transmitted through the duct to the array holes on the front wall of the front air chamber to form a bubble air curtain. When the water surface drops, the one-way air inlet valve on the rear wall of the rear air chamber introduces ambient air into the air chamber. Another part of the fluctuating water climbs along the outer wall of the first semicircular breakwater, and is affected by the bubble air curtain during the climbing process, dissipating part of the kinetic energy. Then the water contacts the front wall of the second semicircular breakwater and dissipates part of the kinetic energy again.

[0024] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A wave energy conversion twin semicircular dike, characterized in that: The twin semicircular dikes are arranged on a base bed; the twin semicircular dikes include: a first semicircular breakwater and a second semicircular breakwater overlapping front and rear, and a partition is arranged downwardly at the overlapping part, and a transducer module is arranged upwardly at the overlapping part; the transducer module is communicated with the front air chamber; The first semicircular breakwater and the partition plate form a front air chamber, and the partition plate and the second semicircular breakwater form a rear air chamber; a narrow opening is provided on the partition plate, and the front air chamber and the rear air chamber are connected through the narrow opening; a water inlet is provided on the inner wall of the front air chamber for waves to propagate into the air chamber; an integrally connected conduit is arranged on the inner wall of the front air chamber, the partition plate and the inner wall of the rear air chamber, and one end of the conduit is connected to a plurality of rows of small-diameter air holes arranged on the upper part of the outer wall of the front air chamber.

2. The wave energy conversion twin semicircular dike according to claim 1, characterized in that: The self-oscillation period of the front air chamber is consistent with the designed small wave period, and the self-oscillation period of the rear air chamber is consistent with the designed large wave.

3. The wave energy conversion twin semicircular dike according to claim 1, characterized in that: The front and rear toes of the twin semicircular dikes are respectively provided with front toes and rear toes at the front and rear footings of the dikes, and the front toes and rear toes are used to increase the stability of the structure.

4. The wave energy conversion twin semicircular dike according to claim 1, characterized in that: A one-way air intake valve is arranged on the rear wall of the rear air chamber, and the one-way air intake valve is used to introduce ambient air into the air chamber.

5. The wave energy conversion twin semicircular dike according to claim 1, characterized in that: The energy conversion module includes a protective shell, an air turbine, and a power transmission line. The protective shell is arranged at the intersection of a first semicircular breakwater and a second semicircular breakwater. The air turbine is arranged in the protective shell. A through hole is arranged at the connection between the first semicircular breakwater and the protective shell. The air turbine is connected to the front air chamber through the through hole.

6. A method for converting wave energy under various wave conditions, characterized in that: Using the twin semicircular dikes described in any one of claims 1 to 5 to convert wave energy; When the incident wave is a small wave, the small wave enters the front air chamber through the water inlet, oscillates in the front air chamber, and drives the air in the front air chamber to flow in and out. The energy conversion module captures the oscillating airflow in the front air chamber and converts the mechanical energy of the airflow oscillation into air turbine work to generate electricity; When the incident wave is a large wave, a part of the fluctuating water enters the front air chamber through the water inlet, and then passes through the narrow hole over the baffle into the rear air chamber, causing water oscillation in both the front and rear air chambers. During surges, the water level rises, and the air in the rear air chamber is squeezed into the duct, and is transmitted to the array holes on the front wall of the front air chamber through the duct to form a bubble air curtain. When the water level drops, the one-way air inlet valve on the rear wall of the rear air chamber introduces ambient air into the air chamber. Another part of the fluctuating water climbs along the outer wall of the first semicircular breakwater, and is affected by the bubble air curtain during the climbing process, dissipating part of the kinetic energy. Then the water body contacts the front wall of the second semicircular breakwater, dissipating part of the kinetic energy again.

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