Ocean riser eight-arc cylinder vortex-induced vibration suppression and power generation device

Abstract

The invention discloses a marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device which comprises a marine riser, a protection module, a power transmission module and a power generation module. The protection module comprises a mounting inner pipe and a mounting outer pipe; the mounting outer pipe comprises a middle section with an arc-shaped notch; working cabins are arranged at two ends of the middle section; thrust rods are arrayed on the circumference of the working cabin; an arc-shaped shell is arranged at one end of the thrust rod; the power transmission module comprises a rotating impeller, a fixed rod, a driving straight bevel gear and an eccentric disc; the driving straight bevel gear is meshed with a two-way straight bevel gear; the two-way straight bevel gear is meshed with a driven straight bevel gear; the driven straight bevel gear penetrates through the working cabin and is connected with the eccentric disc; the eccentric disc is connected with a thrust rod through a straight groove connecting rod; the power generation module comprises an arc-shaped piezoelectric plate on an arc-shaped shell, and the arc-shaped shell comprises an upper bottom plate embedded with an upper electrode and a lower bottom plate embedded with a lower electrode; and an electret is arranged on the lower electrode. While ocean current energy is converted into electric energy, vortex-induced vibration of the stand pipe is restrained.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean engineering, and particularly to an eight-arc cylindrical vortex-induced vibration suppression and power generation device for marine risers. Background Art

[0002] A marine riser is a conduit connecting a surface floating device and a subsea facility (such as a wellhead, a manifold), and is an important structure for offshore oil and gas resource development. Marine risers have various possible structural forms, and common ones include top-tensioned risers, steel catenary risers, flexible risers, and free-standing risers, etc. Marine risers are in a harsh marine environment for a long time and are vulnerable to the influence of ocean currents. When the ocean current velocity reaches a certain value, if the vortex shedding frequency is consistent with the natural frequency of the riser, vortex-induced vibration of the riser will be triggered. This vortex-induced vibration is a key factor causing fatigue damage of the riser, which will not only threaten the safe operation of the riser, but also increase the operation time and cost of offshore oil and gas production. In addition, in the current context of continuous economic prosperity, the human thirst for energy is becoming increasingly strong. Exploring cleaner new energy is of great significance for meeting long-term future needs and reducing the dependence on fossil fuels. Offshore new energy is gradually emerging and becoming one of the main forces in the new energy field in the short term. The ocean contains many clean energies such as wave energy, tidal energy, and ocean current energy, and its large-scale development and utilization are expected to become a key supporting force for the current energy structure transformation. To sum up, how to ensure that marine risers can work safely and stably, and how to develop and utilize new energy in a harsh marine environment are the core problems that need to be solved urgently in the field of ocean energy development. In addition, the current vortex-induced vibration suppression devices for marine risers have a single function and low utilization rate of ocean energy. In view of this, it is necessary to develop a new type of vortex-induced vibration suppression and power generation device for marine risers to solve the above problems.

[0003] At present, the main deficiencies of the current vortex-induced vibration suppression devices for marine risers are technical performance limitations, such as the damping effect of spiral baffles decreasing at high flow velocities or in complex flow directions, the fairing being direction-sensitive and occupying a large space, and passive devices being difficult to dynamically adapt to sea condition changes; reliability problems, such as deep-sea high pressure and corrosive environment leading to material aging, and biofouling weakening the effectiveness, and active control depending on high-precision algorithms and stable power supply; economic challenges, such as high installation and maintenance costs, and customized designs being difficult to scale up; design bottlenecks, such as insufficient synergy of single technologies and lack of multi-physical field coupling optimization. These limitations restrict the long-term stable application of the devices in extreme deep water and dynamic sea conditions. Summary of the Invention

[0004] Objective of the Invention: Aiming at the deficiencies in the prior art, the present invention proposes an eight-arc cylinder vortex-induced vibration suppression and power generation device for marine risers. Each flow-facing surface of the eight-arc cylinder is in an "m" shape, and the arc structure can change the flow direction of the ocean current, reduce the impact force of the ocean current, thereby reducing the intensity of vortex-induced vibration, alleviating the impact load of the ocean current on the marine riser, and playing a protective role for the marine riser. The eight-arc cylinder structure and the rotation of the impeller driving the arc-shaped outer shell to move reciprocally in the normal direction can both achieve the effect of suppressing the vibration of the riser. At the same time, by using the piezoelectric sheet power generation and electret power generation principles for power generation, the ocean energy is effectively utilized, and the ocean current energy is converted into electrical energy in an environmentally friendly way while suppressing the vortex-induced vibration of the riser.

[0005] Technical Solution: The eight-arc cylinder vortex-induced vibration suppression and power generation device for marine risers of the present invention includes a marine riser, a protection module, a power transmission module, and a power generation module.

[0006] The protection module includes an installation inner tube located outside the marine riser; there is an installation outer tube outside the installation inner tube; the installation outer tube includes an intermediate section with an arc-shaped notch; there are working cabins at both ends of the intermediate section; a plurality of thrust rods are arranged in an array on the circumference of the working cabins; one end of the thrust rod is provided with an arc-shaped outer shell; the bottom of the working cabin is provided with a first hole and a power hole.

[0007] The power transmission module includes a rotating impeller, a fixed rod, a driving straight bevel gear, and an eccentric disc; the fixed rod is coaxial with the first hole, the rotating impeller, and the driving straight bevel gear; the rotating impeller is located at the arc-shaped notch; two bidirectional straight bevel gears are meshed and connected to the driving straight bevel gear; one end of the bidirectional straight bevel gear is meshed and connected to a driven straight bevel gear; the driven straight bevel gear passes through the power hole and is connected to the lower rod of the eccentric disc; the upper rod of the eccentric disc is connected to a straight groove connecting rod; the straight groove connecting rod is connected to the thrust rod.

[0008] The power generation module includes arc-shaped piezoelectric sheets distributed on the arc-shaped outer shell. The arc-shaped outer shell includes an upper bottom plate embedded with an upper electrode and a lower bottom plate embedded with a lower electrode; a spring is connected between the upper bottom plate and the lower bottom plate; a support rod connected to the upper bottom plate is provided on the arc-shaped piezoelectric sheet; an electret is installed on the lower electrode.

[0009] The intermediate section is a cylinder with arc-shaped notches in multiple directions. These arc-shaped notches not only reduce the weight of the structure but also optimize the flow path of the ocean current, reducing the impact force of the ocean current on the device.

[0010] Limit blocks for restricting the movement trajectory of the arc-shaped pressure point sheet are provided in the middle and at both ends of the arc-shaped outer shell to ensure that the arc-shaped piezoelectric sheet remains in a predetermined track during movement.

[0011] Installation holes for connecting the support rod to the upper bottom plate are provided on the arc-shaped outer shell.

[0012] A thrust rod protective shell is sleeved outside the thrust rod.

[0013] The upper rod of the eccentric disk is fixedly connected to the straight groove of the straight groove connecting rod.

[0014] The arc-shaped outer shells are distributed on the circumference to form an eight-arc cylindrical structure.

[0015] Both ends of the inner installation pipe are fixedly connected with pipe body reinforcement members, which not only enhance the structural strength of the inner installation pipe, but also provide stability for the entire device.

[0016] The power holes opened on the working cabin are the second hole and the third hole, and two driven straight bevel gears pass through the second hole and the third hole.

[0017] The blades of the rotating impeller are in an inclined curved surface, and the rotation of the rotating impeller plays a role in reducing the sea current velocity.

[0018] Working principle: The present invention adopts a multi-stage energy dissipation and dual-mode energy conversion, external diversion, internal dissipation, and energy conversion collaborative vibration suppression system. Through the characteristic that each flow-facing surface of the eight-arc cylinder is in an "m" shape, and the arc-shaped structure changes the flow direction of the sea current, reducing the impact force of the sea current. The sea current flows into the device interior from the gaps between the arc-shaped outer shells, impinging on the rotating impellers in four directions to rotate, breaking the boundary layer around the riser, and playing a role in weakening the intensity of vortex-induced vibration. The arc-shaped piezoelectric sheet is deformed and generates an electric current under the action of the impact of the sea current and the movement of the arc-shaped outer shell driven by the thrust rod, and electricity is generated by using the electret through the relative movement between the arc-shaped piezoelectric sheet and the arc-shaped outer shell. Both can convert the sea current energy into electric energy.

[0019] At the structural design level of the present invention: The external uses arc-shaped outer shells, and the sea current is separated by flow around through the curved surface, reducing the pressure on the flow-facing surface; the internal is provided with a smooth curve diversion structure, combined with the rotating impeller, so that the impact force is reduced in stages, thereby suppressing vortex-induced vibration; at the energy conversion level, arc-shaped piezoelectric sheets are arranged in an array on the arc-shaped outer shell to generate electricity using the piezoelectric effect; at the same time, an electret power generation device is arranged inside the arc-shaped outer shell to capture charges, and the two form a dual-mode energy conversion system. This device breaks through the limitation of the single-phase energy consumption of traditional vibration suppression devices, and while ensuring the vibration suppression effect of the riser, constructs a sustainable power supply ocean power generation system.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0021] (1) Each flow-facing surface of the eight-arc cylinder of the present invention is in an "m" shape, and the arc-shaped structure can change the flow direction of the sea current, which is beneficial to reducing the impact force of the sea current, and further weakening the intensity of vortex-induced vibration. The sea current flows into the device interior from the gaps between the arc-shaped outer shells, impinging on the rotating impellers in four directions to rotate, breaking the boundary layer around the riser, and playing a role in weakening the intensity of vortex-induced vibration.

[0022] (2) In the present invention, the rotation of the rotary impeller is transmitted through the rotation of the gear of the power transmission module, which can be converted into a reciprocating motion of the thrust rod driving the arc-shaped housing in the radial direction, playing a role in disturbing the flow.

[0023] (3) In the present invention, the arc-shaped piezoelectric sheet is deformed and generates an electric current under the action of the ocean current impact and the movement of the thrust rod driving the arc-shaped housing, converting the ocean current energy into electrical energy.

[0024] (4) Inside the arc-shaped housing of the present invention, the upper electrode is fixed, and the electret is pasted on the surface of the lower electrode. When the arc-shaped piezoelectric sheet and the arc-shaped housing move relative to each other, the upper electrode can move up and down with the vibration. When the air gap between the two components decreases under the external force, the upper electrode approaches the electret film, and the induced charge density of the upper electrode will correspondingly increase to the induced charge density of the lower electrode. Therefore, the relative potential balance between the two electrodes is lost, and electrons immediately flow out from the two electrodes until the next potential balance. In the initial state, there is no potential difference. As the upper electrode moves away from the initial position, the potential difference gradually increases. Although the electret material restricts the electrons in the body, the alternating potential difference between the two electrodes pumps the charges without a surface to circulate in the circuit.

[0025] (5) The device of the present invention is processed from lightweight materials, with light weight and not easily corroded. Description of the Drawings

[0026] Figure 1 is the overall structural schematic diagram of the ocean riser eight-arc cylindrical vortex-induced vibration suppression and power generation device of the present invention;

[0027] Figure 2 is the overall internal structural schematic diagram of the present invention;

[0028] Figure 3 is the overall bottom-up perspective view of the present invention;

[0029] Figure 4 is the schematic diagram of the hole punching at the bottom of the working cabin of the present invention;

[0030] Figure 5 is the structural schematic diagram of the power transmission module of the present invention;

[0031] Figure 6 is the structural schematic diagram of the arc-shaped housing of the present invention;

[0032] Figure 7 is the schematic diagram of the power generation module of the present invention;

[0033] Figure 8 is the schematic diagram of the refined gear structure of the present invention. Detailed Embodiment

[0034] In the figure: marine riser 1; installation inner pipe 2; pipe body reinforcement 3; installation bolt assembly 4; working cabin 5; thrust rod housing 6; middle section 7; rotating impeller 8; fixed rod 9; driving straight bevel gear 10-1; driven straight bevel gear 10-2; bidirectional straight bevel gear 10-3; eccentric disc 11; straight groove connecting rod 12; straight groove connecting rod single-pass nut 12-1; thrust rod 13; thrust rod single-pass nut 13-1; arc-shaped piezoelectric sheet 14; middle limit block 15; boundary limit block 16; arc-shaped housing 17; support rod 18; upper bottom plate 19; upper electrode 20; buffer spring 21; electret 22; lower electrode 23; lower bottom plate 24.

[0035] As Figures 1 to 8 shown, the eight-arc cylindrical vortex-induced vibration suppression and power generation device for marine risers of the present invention includes a marine riser 1, a protection module, a power transmission module, and a power generation module. The protection module includes an installation inner pipe 2 arranged on the outer side of the marine riser, an installation outer pipe arranged on the outer side of the installation inner pipe, and an arc-shaped housing 17 connected to the installation outer pipe through a thrust rod.

[0036] As Figure 1 shown, the installation inner pipe 2 is arranged on the outer side of the marine riser 1 and is coaxial with the marine riser 1 to ensure stable connection and structural symmetry between the two. The installation inner pipe is composed of two hollow semi-cylindrical shells. Pipe body reinforcements 3 are fixedly connected to the head and tail ends on the outer side of the installation inner pipe 2. The pipe body reinforcements not only enhance the structural strength of the installation inner pipe 2 but also provide stability for the entire device. Installation bolt assemblies 4 are arranged at the pipe body reinforcements 3 to fix the installation inner pipe 2 on the outer side of the marine riser 1, ensuring that the device of the present invention can withstand the impact of ocean currents and operate stably for a long time in a complex marine environment.

[0037] As Figure 2 shown, the installation outer pipe is fixedly connected to the outer side of the installation inner pipe and is coaxial with the installation inner pipe 2 to ensure structural symmetry and stability. The installation outer pipe is composed of two working cabins 5 and one middle section 7 and eight thrust rod housings 6. The working cabins 5 are evenly arranged with eight thrust rod housings 6 in a circumferential array. These thrust rod housings 6 provide necessary protection and guidance for the thrust rods to ensure smooth movement in a complex marine environment.

[0038] At the bottom of the working cabin 5, a first hole 5-1 and a power hole are opened. The power hole is a second hole 5-2 and a third hole 5-3, as Figure 4 shown. These holes are not only used for the installation and fixation of the rotating impeller but also provide fixed points for the connection and transmission of the internal straight bevel gear set. The bottom of the working cabin separates the working cabin from the middle section to ensure the independence and non-interference of the functions of each part.

[0039] The middle section 7 is a cylinder with arc-shaped notches provided in four directions. These arc-shaped notches not only reduce the weight of the structure, but also optimize the flow path of the ocean current, reduce the impact force of the ocean current on the device, and at the same time provide space for the installation and operation of the rotating impeller, enabling the device to efficiently generate power under the action of the ocean current, further driving the power generation module to achieve the conversion and utilization of energy.

[0040] As Figure 3 , Figure 6 shown, there are a total of eight arc-shaped outer shells 17. The arc-shaped outer shells 17 are evenly distributed on the circumference, forming an eight-arc cylindrical structure, making each current-facing surface in an M shape to reduce the impact of the ocean current. The radius of the arc-shaped outer shell is half of the maximum circle radius, forming an eight-arc cylinder. The arc-shaped outer shells 17 are provided with boundary limit blocks 16 at both ends and middle limit blocks 15 in the middle. The function of these limit blocks is to ensure that the arc-shaped piezoelectric sheets remain within the predetermined track during movement, preventing excessive displacement or deviation, thereby ensuring the normal operation of the device.

[0041] According to the position of the support rods 18 on the arc-shaped piezoelectric sheets, mounting holes are provided on the arc-shaped outer shells 17 to reserve space for the arrangement of the support rods 18. Each of the head and tail ends of the arc-shaped outer shells 17 is connected to a thrust rod 13. These thrust rods 13 transfer the rotation of the rotating impeller to the movement of the arc-shaped outer shell through the power transmission module, and then drive the power generation module to achieve the efficient conversion of ocean current energy into electrical energy.

[0042] As Figure 5 shown, the power transmission module consists of a rotating impeller 8, a fixed rod 9, and a straight bevel gear set. The blades of the rotating impeller 8 are in an inclined curved surface. There are a total of four rotating impellers, which are evenly arranged at the arc-shaped notches with the four points of the circumferential array of the middle section 7 as the radius to improve the capture efficiency of the ocean current and the power conversion performance.

[0043] The straight bevel gear set consists of a driving straight bevel gear 10-1, a two-way straight bevel gear 10-3, and a driven straight bevel gear 10-2. The rotating impeller 8 and the fixed rod 9 are coaxial to ensure the stable rotation of the rotating impeller 8. The fixed rod 9 passes through the bottom of the working cabin 5 and is connected to the driving straight bevel gear 10-1. The fixed rod 9, the hole 5-1 at the bottom of the working cabin 5, and the driving straight bevel gear 10-1 are coaxial to ensure the high efficiency and stability of power transmission.

[0044] The driving straight bevel gear 10-1 meshes with one end of each of the two two-way straight bevel gears 10-3 at the same time. The other ends of the two two-way straight bevel gears 10-3 are respectively meshed with the driven straight bevel gears 10-2. The two driven straight bevel gears 10-2 are respectively connected to the lower rods of the eccentric discs 11 and fixed to the holes 5-2 and 5-3 at the bottom of the working cabin 5, that is, the driven straight bevel gears 10-2, the lower rods of the eccentric discs 11, the holes 5-2, and 5-3 are coaxial, as Figure 4 shown.

[0045] The upper rod of the eccentric disk 11 is fixedly connected to the straight groove part of the straight groove connecting rod 12 through the straight groove connecting rod single-pass nut 12-1. The other end of the straight groove connecting rod 12 is fixedly connected to the thrust rod 13 through the thrust rod single-pass nut 13-1. The thrust rod 13 is welded to the arc-shaped housing 17 to form a complete power transmission chain, which effectively transmits the power of the ocean current to the arc-shaped housing, drives its movement, and then drives the power generation module to generate electric energy.

[0046] As Figure 7 shown, the power generation module includes arc-shaped piezoelectric sheets 14 and an electret power generation device. The electret power generation device is located inside the arc-shaped housing 17 and consists of an upper bottom plate 19 and a lower bottom plate 24 connected by buffer springs 21, an upper electrode 20 embedded and fixed on the upper bottom plate 19 and a lower electrode 23 of the lower bottom plate, an electret 22 installed on the lower electrode 23, and a support rod 18 for connecting the arc-shaped piezoelectric sheets.

[0047] Arc-shaped piezoelectric sheets 14 are evenly distributed on the arc-shaped housing 17. The function of the arc-shaped piezoelectric sheets 14 is to maximize the capture of the vibration energy caused by the ocean current and convert the vibration energy into electric energy.

[0048] Each of the four end points of the arc-shaped piezoelectric sheet 14 is provided with a support rod 18. The support rod 18 is welded to the upper bottom plate 19 inside the arc-shaped housing 17 through a hole opened on the arc-shaped housing 17, and an upper electrode 20 is embedded and fixed on the upper bottom plate 19. The upper bottom plate 19 is connected to the lower bottom plate 24 through buffer springs 21 at the four end points, which not only provides the necessary mechanical support but also maintains the stable contact of the electrodes during vibration. The lower bottom plate 24 is embedded and fixed with a lower electrode 23, and the lower electrode works in cooperation with the upper electrode to form a complete electrical circuit.

[0049] An electret 22 is installed on the lower electrode 23. The electret 22 maintains charges for a long time and plays a key role in the power generation process. By interacting with the upper electrode, it improves the efficiency of electric energy generation and transmission.

[0050] The arc-shaped piezoelectric sheet 14 is deformed and generates current under the action of the impact of the ocean current and the movement of the thrust rod driving the arc-shaped housing 17, and electric power is generated by using the electret 22 through the relative movement between the arc-shaped piezoelectric sheet 14 and the arc-shaped housing 17, converting the ocean current energy into electric energy.

[0051] The working process of the ocean riser eight-arc cylindrical vortex-induced vibration suppression and power generation device of the present invention is as follows:

[0052] Step (1): Fix the device outside the marine riser. The eight-arc cylindrical arc-shaped outer shell ensures that when the ocean current impacts the device, each current-facing surface is not only smooth but also in an "m" shape. This design effectively reduces the impact force of the ocean current, thereby reducing the vibration of the device caused by the ocean current impact, playing a role in suppressing vortex-induced vibration, and ensuring the stable operation of the device in a complex marine environment.

[0053] Step (2): When the ocean current flows into the device, it drives the rotating impeller inside the device to rotate. This process realizes the conversion of ocean energy into the mechanical energy of the rotating impeller. At the same time, the rotation of the rotating impeller reduces the flow velocity of the ocean current, further reducing the impact force of the ocean current on the device and improving the stability of the device operation.

[0054] Step (3): When the rotating impeller rotates, through the gear power transmission device in the working cabin, the energy is converted into the mechanical energy of the centripetal movement of the arc-shaped outer shell via the thrust rod. The gear transmission system in this process ensures the efficient transmission of power, reduces energy loss, and thus improves the energy conversion efficiency of the entire device.

[0055] Step (4): The centripetal movement of the arc-shaped outer shell enables the arc-shaped piezoelectric sheets on the arc-shaped outer shell to obtain mechanical energy. The piezoelectric sheets deform more severely under the full impact and interaction with the ocean current, accumulating electrical energy. At the same time, the mechanical energy of the arc-shaped piezoelectric sheets is transmitted to the electret power generation device inside the arc-shaped outer shell through the movement of the support rod for secondary power generation. This process utilizes the piezoelectric effect and the electret power generation principle to achieve multi-stage conversion and efficient utilization of energy, improving the power generation efficiency and energy utilization rate of the entire device.

Claims

1. An eight-arc cylindrical vortex-induced vibration suppression and power generation device for a marine riser, characterized in that: It includes an offshore riser (1), a protection module, a power transmission module, and a power generation module; The protection module includes an installation inner pipe (2) located outside the offshore riser (1); there is an installation outer pipe outside the installation inner pipe (2); the installation outer pipe includes an intermediate section (7) with an arc-shaped notch; there are working cabins (5) at both ends of the intermediate section (7); a plurality of thrust rods (13) are arrayed on the circumference of the working cabin (5); one end of the thrust rod (13) is provided with an arc-shaped housing (17); a first hole (5-1) and a power hole are opened at the bottom of the working cabin (5); The power transmission module includes a rotary impeller (8), a fixed rod (9), a driving straight bevel gear (10-1), and an eccentric disc (11); the fixed rod (9) is coaxial with the first hole (5-1), the rotary impeller (8), and the driving straight bevel gear (10-1); the rotary impeller is located at the arc-shaped notch; two bidirectional straight bevel gears (10-3) are meshed and connected to the driving straight bevel gear (10-1); one end of the bidirectional straight bevel gear (10-3) is meshed and connected to a driven straight bevel gear (10-2); the driven straight bevel gear (10-2) passes through the power hole and is connected to the lower rod of the eccentric disc (11); the upper rod of the eccentric disc (11) is connected to a straight groove connecting rod (12); the straight groove connecting rod (12) is connected to the thrust rod (13); The power generation module includes arc-shaped piezoelectric sheets (14) distributed on the arc-shaped housing (17), and the arc-shaped housing (17) includes an upper bottom plate (19) embedded with an upper electrode (20), and a lower bottom plate (24) embedded with a lower electrode (23); a spring (21) is connected between the upper bottom plate (19) and the lower bottom plate (24); a support rod (18) connected to the upper bottom plate (19) is provided on the arc-shaped piezoelectric sheet (14); a electret (22) is installed on the lower electrode (23).

2. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: The intermediate section (7) is a cylinder with arc-shaped notches provided in multiple directions.

3. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: Limit blocks for restricting the movement trajectory of the arc-shaped pressure point sheet are provided in the middle and at both ends of the arc-shaped housing (17).

4. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: Installation holes for connecting the support rod (18) and the upper bottom plate (19) are opened on the arc-shaped housing (17).

5. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: A thrust rod housing (6) is sleeved outside the thrust rod (13).

6. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, wherein: The upper rod of the eccentric disc (11) is fixedly connected to the straight groove of the straight groove connecting rod (12).

7. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: The arc-shaped housing (17) is distributed on the circumference to form an eight-arc cylindrical structure.

8. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, characterized in that: Both ends of the installation inner pipe (2) are fixedly connected with pipe body reinforcement members (3).

9. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, wherein: The power holes opened on the working cabin (5) are a second hole (5-2) and a third hole (5-3), and two driven straight bevel gears (10-2) pass through the second hole (5-2) and the third hole (5-3).

10. The marine riser eight-arc cylindrical vortex-induced vibration suppression and power generation device according to claim 1, wherein: The blades of the rotary impeller (8) are inclined curved surfaces.

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