A ship bow structure with a back-bent pipe wave energy generator

Abstract

The application relates to a bow structure of a wave energy power generation ship with a rear elbow pipe, which comprises a wave-breaking cone head and a water pressure plate, the water pressure plate is horizontally arranged on the upper end of the wave-breaking cone head, and the lower surface of the water pressure plate is a smooth arc curved surface; the water pressure plate at the bow wave-encountering position is designed as a smooth curved surface, so that the waves flow along the curved surface below the water pressure plate, energy loss in the wave-ship head interaction process is reduced; meanwhile, in the downward movement process of the water pressure plate, the water pressure plate is in contact with the wave surface, impact is generated between the water pressure plate and the wave surface, the wave surface generates a large acting force on the water pressure plate, the acting force and the buoyancy of the hollow water pressure plate and the wave-breaking cone head jointly act on the bow, so that the device bow rapidly emerges from the water after entering the water surface, a large pitching motion is generated, and the power generation efficiency of the wave energy power generation device is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a ship bow structure for wave energy generation by means of a rear elbow pipe, and belongs to the technical field of wave energy generation. BACKGROUND

[0002] Due to the huge storage of ocean wave energy resources and the broad development prospect, wave energy generation has been widely concerned by researchers in recent years. Common wave energy generation devices mainly have the working principles of an oscillating buoy type, an oscillating water column type and a wave overtopping type.

[0003] The rear elbow pipe technology is a mainstream technology of the oscillating water column type in recent years, has a good capture width ratio, can capture wave energy under the action of waves, obtains mechanical energy by means of the generated oscillation, and converts the mechanical energy into electric energy by means of a pipe, an air chamber and a turbine.

[0004] In order to better make the ship bow part move upward quickly and generate large-amplitude pitch motion response, the ship bow part needs to be improved to improve the power generation efficiency of the device, and meanwhile, the attitude stability of the wave energy generation device is not hindered. SUMMARY

[0005] The application aims to provide a ship bow structure for wave energy generation by means of a rear elbow pipe to solve the problems in the background art.

[0006] The technical scheme of the application is as follows:

[0007] A ship bow structure for wave energy generation by means of a rear elbow pipe comprises:

[0008] A wave-breaking cone head;

[0009] A water pressure plate is horizontally arranged at the upper end of the wave-breaking cone head, and the lower surface of the water pressure plate is a smooth arc-shaped curved surface.

[0010] Preferably, the wave-breaking cone head and / or the water pressure plate are hollow.

[0011] Preferably, the cross-sectional shape of the curved surface below the water pressure plate is a quarter-period regular wave curve.

[0012] Or an arc-shaped curve.

[0013] Preferably, the wave-breaking cone head is in a streamline type, a sharp type or a conical type.

[0014] Preferably, the water pressure plate extends horizontally and symmetrically from the upper end of the wave-breaking cone head to opposite sides.

[0015] The application has the following beneficial effects:

[0016] The water pressure plate at the bow of the ship is designed as a smooth curved surface, so that the wave flows along the curved surface below the water pressure plate, reducing the energy loss in the process of wave and bow interaction. Meanwhile, during the downward movement of the water pressure plate, the water pressure plate contacts with the wave surface, and the two produce impact, so that the wave produces a larger force on the water pressure plate. The force and the buoyancy of the hollow water pressure plate act on the bow together, so that the device quickly emerges from the water after entering the water surface, and a larger pitching motion is generated, thereby improving the power generation efficiency of the wave energy power generation device.

[0017] The wave-breaking cone head is conical, which reduces the movement speed of fluid along the streamline surface of the bow, and reduces the wave-making loss. Moreover, due to the unique conical bow structure design, the wave energy power generation device continuously cuts the wave during the pitching motion, so that the wave force near the stern increases, and the stern is lifted high, and reciprocating motion with the bow is generated, thereby reducing the energy loss in the wave propagation process, intensifying the pitching motion of the device, and improving the power generation efficiency of the device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a perspective view of the bow of the ship according to the present application;

[0019] Figure 2 Fig. 2 is a front view of the bow of the ship according to the present application;

[0020] Figure 3 Fig. 3 is a side view of the bow of the ship according to the present application;

[0021] Figure 4 Fig. 4 is a top view of the bow of the ship according to the present application;

[0022] Figure 5 Fig. 5 is a schematic view of a regular wave curve according to the present application;

[0023] Figure 6 Fig. 6 is a perspective view of the wave energy power generation device according to the present application from a first perspective;

[0024] Figure 7 Fig. 7 is a perspective view of the wave energy power generation device according to the present application from a second perspective;

[0025] Figure 8 Fig. 8 is a side view of the wave energy power generation device according to the present application.

[0026] In the drawings, the reference signs represent:

[0027] 1, wave-breaking cone head; 2, water pressure plate; 3, horizontal pipe; 4, elbow pipe; 5, air chamber; 6, buoyancy cabin; 7, mooring point; 8, wing plate. DETAILED DESCRIPTION

[0028] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] Example: Figures 1-5 As shown:

[0030] The water pressure plate 2 is horizontally mounted on the upper end of the wave-breaking cone 1 and is integrally formed. The hollow interior of the water pressure plate 2 and the wave-breaking cone 1 facilitates buoyancy for the rear-bend wave energy generator, allowing the bow of the generator to be higher than the stern, allowing waves to better act on the bow. The wave-breaking cone 1 is located relatively in the middle of the water pressure plate 2.

[0031] During wave propagation, the wave follows the streamlined structure of the bow through the wave-breaking cone 1. The conical structure of the wave-breaking cone 1 facilitates wave cutting, causing the water-pressing plate 2 at the bow to move downward. Since the lower portion of the water-pressing plate 2 is a smooth curved surface, the loss of wave energy during the downward movement of the bow is reduced. As the bow continues to move downward, the waves and the horizontal portion of the water-pressing plate 2 collide with each other, exerting a large wave force on the bow. At the same time, the hollow wave-breaking cone 1 and the water-pressing plate 2 can provide a large buoyancy for the bow. Under the combined action of buoyancy and the force of the waves on the bow, the bow moves rapidly upward, causing the device to produce a large pitch motion response, thereby improving the device's power generation efficiency.

[0032] At the same time, the water pressure plates 2 extend horizontally from the upper end of the wave-breaking cone head 1 to the opposite sides. The water pressure plates 2 on the opposite sides of the wave-breaking cone head 1 are symmetrically arranged on the left and right sides. The water pressure plates 2 assist in preventing large-scale rolling motion in the horizontal direction, maintaining the stability of the posture of the power generation device during the movement process, and also ensuring the posture stability of the wave energy power generation device under different sea conditions.

[0033] The curved surface shape of the lower surface of the bow water-punch plate 2 is not limited to a specific one; a variety of shapes are contemplated. Regardless of the shape chosen, the ultimate goal is to reduce energy loss during wave propagation. For example, selecting a partial arc of a circle or a segment of an elliptical curve as the cross-sectional shape of the curved surface below the water-punch plate 2 can minimize energy loss during wave interaction with the curved surface of the bow water-punch plate 2. Such shapes also facilitate manufacturing.

[0034] Further, such as Figure 3 and 5 As shown by the bold line in the figure, the curve within one-quarter of the regular wave period can also be used as the cross-sectional shape of the lower curved surface of the water-punching plate 2. During the wave propagation process, the wave surface can precisely fit the curved surface below the bow water-punching plate 2, minimizing wave energy loss. Regarding the selection of regular wave parameters, the corresponding significant wave height and wave period under the specific sea conditions of the operating area can be selected as the regular wave height and period. The significant wave height can be the average value of historical sea condition wave height data.

[0035] Although the lower surface of the wing plate 8 and the water pressure plate 2 are both derived from the “curve within a quarter period of a regular wave”, the wave interacts with the structure when propagating from the bow to the stern, and the wave changes.

[0036] like Figures 6-8 The figure shows a rearward curved pipe wave energy power generation device, comprising a hull, a bow, and wing panels 8 mounted on both sides of the hull. The hull is composed of an air chamber 5, a rearward curved pipe structure with openings at both ends, and a buoyancy compartment 6. The rearward curved pipe structure includes a horizontal pipe 3 and a curved pipe 4. The upper portion of the curved horizontal pipe 3 is connected to the buoyancy compartment 6. The air chamber 5 is located above the curved pipe 4. The area above the air chamber 5 can be used to house an air turbine device for converting mechanical energy into electrical energy. In addition, the device's single-point mooring system 7 is located at the front side of the hull's longitudinal length, near the center of gravity, to ensure the safety of the wave energy power generation device in hazardous sea conditions. At the same time, the location of the single-point mooring system 7 does not restrict the wave energy power generation device's pitch motion response, allowing the device to maintain a high power generation efficiency and ensuring the device's safety in hazardous sea conditions. Two curved trapezoidal wing panels 8 are placed on both sides of the hull to ensure the stability of the wave energy power generation device in operating sea conditions and provide buoyancy in the ship's width direction to suppress rolling motion.

[0037] The cross-sectional shape of the horizontal pipe 3 is "gyro-shaped". The gyro-shape is adopted to ensure that the internal curved surface of the flow channel is relatively smooth, reduce the energy loss caused by mutual friction during the flow of the fluid in the flow channel, and effectively reduce the water resistance encountered by the device during the oscillating motion, thereby increasing the amplitude of motion and improving the capture performance of the device. In addition, the flow channel in the horizontal pipe 3 is a streamlined curved surface, which reduces the energy loss caused by wave motion. The inlet cross-sectional area of ​​the curved pipe 4 is larger than the horizontal cross-sectional area of ​​the air chamber 5, so that the speed of the fluid flowing in the air chamber is greater than the fluid speed of the horizontal pipe 3, thereby improving the aerodynamic efficiency. The air chamber 5 is located above the curved pipe 4, and the flow of the fluid in the rear bend causes the pressure in the air chamber to change, forming a pressure difference.

[0038] The buoyancy tank 6 is located above the horizontal pipe 3. On the one hand, it provides buoyancy for the device to ensure the stability of the device's posture during movement. On the other hand, the interior of the buoyancy tank 6 is divided into several small ballast water compartments distributed in multiple layers. According to the survey of the sea conditions in the working sea area, different ballast water schemes are preset in advance, so that the device can adjust the ballast conditions of the compartments according to different levels of working sea conditions, change the center of gravity position and mass distribution of the device, and thus adjust the device's pitch motion natural period. After adjustment, the pitch motion natural period of the wave energy power generation device is adjusted to be close to the wave period of the sea conditions in the working sea area, so that the wave energy power generation device and the waves can resonate as much as possible to obtain a greater pitch motion response, so that the device can maintain a high power generation efficiency.

[0039] Two symmetrical, curved-edge trapezoidal wing panels 8 are located on either side of the hull. Both panels are hollow, providing significant buoyancy on either side of the ship's width. This provides a strong restoring force when the device experiences roll motion, ensuring that the device does not experience significant roll motion in the horizontal direction and maintaining a stable posture during motion. Wing panels 8 are relatively located near the stern, for example, extending from the middle of the hull to the stern. As waves propagate from the bow to the stern, the curved surface beneath wing panels 8 first interacts with the waves. As waves pass beneath wing panels 8, they initially move downward along their lower curved surface. The smooth curved surface beneath wing panels 8 effectively reduces wave energy loss during downward motion. During this downward motion, waves interact with wing panels 8, generating an upward force on the stern. Simultaneously, the hollow structure of wing panels 8 provides an upward buoyancy force for the stern of the device. These two forces act together to rapidly elevate the stern, causing the device to respond with significant pitch motion, thereby improving its power generation efficiency. If the wing plate 8 extends from the bow, the buoyancy provided by the hollow wing plate 8 will also provide a large restoring force in the direction of the ship's length, which will suppress the pitching motion related to power generation efficiency.

[0040] Compared with the multiple small wing panels with a distributed structure, the large wing panels with an integral structure of the hull side wall have the following advantages. First, fewer components can better ensure the consistency of the structure of the wing panels 8 on both sides, and will not cause the device to tilt. Second, the integral structure has fewer components and higher reliability, and it is easier to repair if a failure occurs later.

[0041] The curved surface shape of the lower surface of the wing plate 8 is not limited to a specific curved surface shape; a variety of wing plate shapes are contemplated. Regardless of the shape chosen, the ultimate goal is to reduce energy loss during wave propagation. For example, selecting a partial arc of a circle or a segment of an elliptical curve as the cross-sectional shape of the curved surface below the wing plate 8 can ensure that energy loss during the interaction between waves and the curved surface of the wing plate 8 is reduced. This type of shape also facilitates manufacturing.

[0042] like Figure 5 As shown by the bold line in the figure, the curve within one-quarter of the regular wave period can also be used as the cross-sectional shape of the lower curved surface of the curved wing plate 8. During the wave propagation process, the wave front can precisely fit the curved surface below the wing plate 8, minimizing wave energy loss. Regarding the selection of regular wave parameters, the significant wave height and wave period corresponding to the specific sea conditions of the operating area can be selected as the regular wave height and period. The significant wave height can be the average value of historical sea condition wave height data.

[0043] The sea conditions of the working sea area of the wave energy power generation device change in real time with the season and climate, but in marine engineering, it is considered that the short-term sea conditions in the same sea area do not change within three hours, different sea conditions correspond to different wave periods, and if the wave energy power generation device wants to achieve high power generation, the inherent period of the power generation device itself, especially the pitch inherent period related to the power generation, should be as close as possible to the wave inherent period corresponding to the sea conditions. In marine engineering, the inherent period of the floating body is affected by the position of the center of gravity of the floating body and the weight distribution, so the buoyancy tank 6 of the wave energy power generation device can be divided into a plurality of small ballast water compartments, the position of the center of gravity of the wave energy power generation device and the weight distribution are changed by changing the state of the small ballast water compartments, and then the pitch motion inherent period of the wave energy power generation device is changed. When the adjusted pitch motion inherent period is the same as or close to the wave period of the current sea conditions, the wave energy power generation device will resonate violently in the pitch direction under the action of the wave, so that the pitch motion always maintains a large motion amplitude, and the wave energy power generation device maintains a high power generation efficiency.

[0044] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A bow structure for wave energy power generation using a rear bent pipe, characterized in that: include: Wave-breaking cone head (1); A water pressure plate (2), the water pressure plate (2) being horizontally arranged at the upper end of the wave-breaking cone head (1), and the lower surface of the water pressure plate (2) being a smooth curved surface extending downward; The cross-sectional shape of the curved surface below the water pressure plate (2) is a regular wave curve with a quarter period.

2. The bow structure for wave energy power generation using a bent-back pipe as claimed in claim 1, characterized in that: The wave-breaking cone head (1) and / or the water pressure plate (2) are hollow.

3. The bow structure for wave energy power generation using a bent-back pipe as claimed in claim 1, characterized in that: The wave-breaking cone head (1) is streamlined.

4. The bow structure for wave energy power generation using a bent-back pipe as claimed in claim 1, characterized in that: The wave-breaking cone head (1) is pointed.

5. The bow structure for wave energy power generation using a bent-back pipe as claimed in claim 1, characterized in that: The wave-breaking cone head (1) is cone-shaped.

6. The bow structure for wave energy power generation using a backward curved pipe according to claim 1, characterized in that: The water pressure plates (2) extend horizontally from the upper end of the wave-breaking cone head (1) to opposite sides and are symmetrically arranged.

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