A round tube structure vortex suppression device and method

Abstract

The application belongs to the technical field of vortex suppression devices, and provides a vortex suppression device and method for a circular pipe structure, which comprises a flow-approaching section and a tail section connected with each other; the vortex suppression device is directly sleeved on the circular pipe structure through a through hole arranged at the flow-approaching section, so that the flow-approaching section and the tail section can change along with the change of the water flow direction; the entire vortex suppression device floats in seawater through a honeycomb structure arranged in the tail section, so that the position of the vortex suppression device in the axial direction of the circular pipe structure can be changed along with the change of the seawater level, the vortex suppression device is ensured to be located at the seawater level, and phenomena such as the seawater submerging the vortex suppression device or the seawater level being separated from the vortex suppression device are avoided; meanwhile, the vertical sectional area of the tail section along the water flow direction gradually decreases, the vortex is suppressed, and the problem of the seawater increasing the acting degree on the rear end of the vortex suppression device is avoided, so that the damage to the vortex suppression device and the circular pipe structure is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of eddy current suppression devices, and particularly relates to a circular tube structure eddy current suppression device and method. Background Technology

[0002] Offshore wind power and offshore oil and gas fixed platforms, nearshore wharves, and cross-sea bridge foundations extensively utilize circular tube structures. When seawater flows through a circular tube structure, laminar flow breaks off at the rear of the tube, forming vortices. These vortices exert lateral forces on the tube structure. When the frequency of vortex discharge is close to the natural frequency of the tube structure, resonance occurs, leading to fatigue failure. Currently, vortex-induced vibration suppression primarily involves controlling the structure's natural frequency to avoid vortex discharge frequencies, with a small number of structures employing vortex suppression devices.

[0003] Traditional eddy current suppression devices, in order to adapt to seawater from different directions, need to be mounted on a circular tube structure with the help of bearings and other components. The area of ​​action in the axial direction of the circular tube structure is fixed. When the sea level rises or falls significantly, the seawater may submerge the eddy current suppression device or the seawater level may detach from the eddy current suppression device, thus failing to meet the requirements for eddy current suppression. Furthermore, the eddy current suppression devices currently used for circular tube structures have a cross-section that first decreases and then increases at the rear end. As the seawater moves from the smaller cross-section to the larger cross-section, it increases the area of ​​action of the seawater on the entire eddy current suppression device, thereby increasing the degree of seawater's impact on the eddy current suppression device and the circular tube structure, causing fatigue and other damage. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a circular tube structure vortex suppression device and method. The vortex suppression device is directly fitted onto the circular tube structure through through-holes, ensuring that the upstream section and tail section change with the direction of water flow. The honeycomb structure inside the tail section allows the entire vortex suppression device to float in the seawater, changing its axial position on the circular tube structure with the rise and fall of the sea level, ensuring the vortex suppression device is positioned at the sea level and preventing it from being submerged or detached from the sea level. Simultaneously, the vertical cross-sectional area of ​​the tail section gradually decreases along the water flow direction, thus preventing increased impact of seawater on the rear end of the vortex suppression device while suppressing vortices, reducing damage to both the vortex suppression device and the circular tube structure.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a circular tube structure eddy current suppression device, which adopts the following technical solution: A circular tube structure eddy current suppression device includes an oncoming section and a tail section connected to each other; The upstream section is provided with through holes that can be fitted onto the circular tube structure; the tail section is provided with a honeycomb structure inside, which makes the entire vortex suppression device float in the seawater. The tail section has a gradually decreasing vertical cross-sectional area along the direction of water flow.

[0006] Furthermore, the flow-facing section includes an arc-shaped head, a first arc-shaped section disposed on both sides of the arc-shaped head, and a second arc-shaped section connected to the first arc-shaped section; the arc-shaped head disperses the water flow to both sides of the eddy current suppression device.

[0007] Furthermore, the vertical cross-sectional area of ​​the eddy current suppression device gradually increases in the direction of water flow, guiding the water flow to continue flowing away from the circular pipe structure.

[0008] Furthermore, the radius of curvature of the second arc segment is greater than the radius of curvature of the first arc segment.

[0009] Furthermore, the tail section includes a third arc-shaped section connected to the second arc-shaped section, a fourth arc-shaped section connected to the third arc-shaped section, and a tail portion connected to the fourth arc-shaped section; the length of the tail section along the water flow direction is greater than the length of the upstream section along the water flow direction.

[0010] Furthermore, the radius of curvature of the third arc segment is greater than the radius of curvature of the fourth arc segment.

[0011] Furthermore, the length of the fourth arc segment along the water flow direction is greater than the length of the third arc segment along the water flow direction.

[0012] Furthermore, the diameter of the through hole is smaller than the outer diameter of the circular tube structure.

[0013] Furthermore, the length of the eddy current suppression device is determined based on the diameter of the circular tube structure and the seawater flow velocity: ; ; ; in, The length of the eddy current suppression device; The coefficient is dimensionless. D is the seawater flow velocity; D is the diameter of the circular pipe structure. For fluid density; This refers to dynamic viscosity.

[0014] To achieve the above objectives, in a second aspect, the present invention also provides a method for suppressing eddy currents in a circular tube structure, employing the following technical solution: A method for suppressing eddy currents in a circular tube structure, using a circular tube structure eddy current suppression device as described in the first aspect, includes: water flowing sequentially through a front section and a tail section, guiding the water flow across the surface of the eddy current suppression device to avoid the occurrence of eddy current-induced vibrations.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the vortex suppression device is directly fitted onto the circular tube structure through a through hole set at the upstream section, ensuring that the upstream section and the tail section change with the direction of water flow. The honeycomb structure inside the tail section allows the entire vortex suppression device to float in the seawater, changing its axial position on the circular tube structure as the sea level rises and falls, ensuring the vortex suppression device is positioned at the sea level and preventing it from being submerged or detached from the sea level. Simultaneously, the vertical cross-sectional area of ​​the tail section gradually decreases along the water flow direction, achieving vortex suppression while avoiding increased seawater impact on the rear end of the vortex suppression device, thus reducing damage to the vortex suppression device and the circular tube structure.

[0016] 2. In this invention, the arc-shaped head is used to first contact the water flow, dispersing the water flow to both sides of the vortex suppression device. The arc-shaped head can reduce the water flow force when the water flow direction is changed. The first arc-shaped segment makes the vertical cross-sectional area of ​​the vortex suppression device gradually increase in the direction of water flow, guiding the water flow to continue to flow away from the circular pipe structure. The radius of curvature of the second arc-shaped segment is greater than that of the first arc-shaped segment, making the water flow away from the circular pipe structure tend to be gentle, so as to transition to the tail section.

[0017] 3. In this invention, the length of the tail section along the water flow direction is greater than the length of the upstream section along the water flow direction, ensuring the degree of effect of the water flow on the side of the tail section, so as to ensure that the upstream section always faces the water flow direction. This is a passive steering method that does not require additional power for adjustment.

[0018] 4. In this invention, the radius of curvature of the third arc segment is greater than that of the fourth arc segment, so that the water flow away from the circular pipe structure transitions smoothly to the fourth arc segment.

[0019] 5. In this invention, the length of the fourth arc segment along the water flow direction is greater than the length of the third arc segment along the water flow direction, so that the water flow on both sides can smoothly gather at the tail end, which can ensure the fit between the water flow and the eddy suppression device and ensure the eddy suppression effect.

[0020] 6. In this invention, the coordination of the arc-shaped head, the first arc-shaped segment, the second arc-shaped segment, the third arc-shaped segment, and the fourth arc-shaped segment prevents the generation and detachment of vortices, thereby preventing vortex-induced vibration and reducing ocean current force; the upstream segment, while avoiding excessive water flow, can guide the water flow to both sides of the vortex suppression device; the tail section can ensure that the water flow transitions smoothly to the fourth arc-shaped segment and allows the water flow on both sides to smoothly gather at the tail, ensuring the vortex suppression effect. Attached Figure Description

[0021] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0022] Figure 1 This is a schematic diagram of the eddy current suppression device according to Embodiment 1 of the present invention; Figure 2 This is a cross-sectional schematic diagram of the eddy current suppression device according to Embodiment 1 of the present invention; Among them, 1. Eddy current suppression device; 101. Frontal section; 1011. Arc-shaped head; 1012. First arc-shaped section; 1013. Second arc-shaped section; 102. Tail section; 1021. Third arc-shaped section; 1022. Fourth arc-shaped section; 1023. Tail; 103. Through hole; 104. Honeycomb structure; 105. Skin; 106. Connector; 2. Circular tube structure. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] Example 1: like Figure 1 and Figure 2 As shown, this embodiment provides a vortex suppression device for a circular tube structure, which can prevent vortices from being generated when ocean currents flow through the circular tube structure, thereby preventing vortex-induced vibration and ensuring structural safety. This device does not require structural adjustments or control of the natural frequencies of the members, avoiding the influence of structural design. Moreover, it is a passive device, requiring no additional energy consumption, and features low cost, easy installation, and good performance.

[0026] The eddy current suppression device 1 has a streamlined external structure, which can guide the water flow uniformly and stably across the surface, avoiding the generation and shedding of eddies, thereby preventing eddy-induced vibration and reducing ocean current force. The eddy current suppression device 1 includes a frontal section 101, a tail section 102 connected to the frontal section 101, a through hole 103 disposed at the frontal section 101, a honeycomb structure 104 disposed within the tail section 102, and a skin 105 disposed outside the honeycomb structure 104; the through hole 103 can be configured as an openable mechanism through a connector 106, which facilitates its fitting onto the circular tube structure 2. The eddy current suppression device 1 is symmetrical along the center, with the same flow velocity on both sides, and will not generate lateral lift.

[0027] The upstream section 101 includes an arc-shaped head 1011, first arc-shaped sections 1012 disposed on both sides of the arc-shaped head 1011, and a second arc-shaped section 1013 connected to the first arc-shaped section 1012. Specifically, the arc-shaped head 1011 is used to first contact the water flow, dispersing the water flow to both sides of the vortex suppression device 1. The arc-shaped head 1011 can reduce the water flow force when the water flow direction changes. The first arc-shaped section 1012 causes the vertical cross-sectional area of ​​the vortex suppression device 1 in the water flow direction to gradually increase, guiding the water flow to continue flowing away from the circular pipe structure 2. The second arc-shaped section 1013 is the transition section between the upstream section 101 and the tail section 102. The radius of curvature of the second arc-shaped section 1013 is larger than that of the first arc-shaped section 1012, making the water flow away from the circular pipe structure 2 tend to be gentle, so as to transition to the tail section 102.

[0028] The cooperation of the arc-shaped head 1011, the first arc-shaped segment 1012, and the second arc-shaped segment 1013 can guide the water flow to both sides of the vortex suppression device 1 while avoiding excessive water flow, and can also ensure that the water flow is smoothly guided to the tail section 102, thus ensuring the vortex suppression effect.

[0029] The tail section 102 includes a third arc-shaped section 1021 connected to the second arc-shaped section 1013, a fourth arc-shaped section 1022 connected to the third arc-shaped section 1021, and a tail section 1023 connected to the fourth arc-shaped section 1022.

[0030] The length of the tail section 102 along the water flow direction is greater than the length of the upstream section 101 along the water flow direction, ensuring that the water flow has a greater effect on the side of the tail section 102, so that the upstream section 101 always faces the water flow direction. This is a passive steering method that does not require additional power for adjustment.

[0031] The radius of curvature of the third arc segment 1021 is greater than that of the fourth arc segment 1022, so that the water flow away from the circular pipe structure 2 smoothly transitions to the fourth arc segment 1022.

[0032] The length of the fourth arc segment 1022 along the water flow direction is greater than the length of the third arc segment 1021 along the water flow direction, so that the water flow on both sides can smoothly gather at the tail 1023, which can ensure the fit between the water flow and the eddy suppression device 1 and ensure the eddy suppression effect.

[0033] The coordination of the arc-shaped head 1011, the first arc-shaped segment 1012, the second arc-shaped segment 1013, the third arc-shaped segment 1021, and the fourth arc-shaped segment 1022 prevents the generation and detachment of vortices, thereby preventing vortex-induced vibration and reducing ocean current force. In the upstream segment 101, the water flow can be directed to both sides of the vortex suppression device 1 while avoiding excessive water flow. In the tail segment 102, the water flow can be smoothly transitioned to the fourth arc-shaped segment 1022, and the water flow on both sides can be smoothly gathered at the tail 1023 to ensure the vortex suppression effect.

[0034] The diameter of the through hole 103 is smaller than the outer diameter of the circular tube structure 2, so that the eddy current suppression device 1 can rotate freely around the circular tube structure 2, ensuring that the upstream section 101 corresponds to the direction of water flow.

[0035] In some other embodiments, to reduce the difficulty of fitting the circular tube structure 2, an openable movable part is provided at the flow-facing section 101. One side of the movable part is hinged to the flow-facing section 101 via a hinge, and the other side is connected via a connector 106. The connector 106 can be unlocked and loosened using a buckle, bolt, or other locking component. Specifically, when fitting, the movable part is opened, the circular tube structure 2 is inserted into the through hole 103, and then the movable part is closed and locked.

[0036] A honeycomb structure 104 is provided in the tail section 102 to reduce the overall weight, so that the vortex suppression device 1 can float on the seawater and rise and fall with the seawater, avoiding the phenomenon that the seawater submerges the vortex suppression device or the seawater level moves away from the vortex suppression device.

[0037] After a honeycomb structure 104 is installed inside the tail section 102, a skin 105 is installed on the outside to seal it and prevent seawater from entering.

[0038] When designing the eddy current suppression device 1, the density, salinity, viscosity, and flow velocity of the seawater at the target application site are first measured. Based on the density of the seawater, the size of the honeycomb structure 104 is adjusted to make it self-buoyant, eliminating the need for other jamming devices, reducing wear, and simplifying installation at sea.

[0039] The honeycomb structure 104 can be made of a polymer material, which has the characteristics of high strength, light weight, and corrosion resistance. By adjusting the size and material composition of the internal honeycomb structure 104, the gravity and buoyancy of the eddy current suppression device 1 can be made equal, and the device will naturally float in the water. In some embodiments, according to the total volume V of the eddy current suppression device 1... 总 and seawater density ρ 海水， Calculate the total buoyancy F 浮 =V 总 *ρ 海水 By adjusting the wall thickness of the honeycomb structure 104, the overall material volume V of the eddy current suppression device 1 is reduced. 实体 =V 总 *ρ 海水 / ρ 材料 This ensures that the gravity and buoyancy of the eddy current suppression device 1 are equal, thereby guaranteeing that the device has self-buoyancy.

[0040] Based on the diameter of the circular tube structure 2 and the seawater flow velocity, determine the length of the eddy current suppression device 1: ; ; ; in, The length of the eddy current suppression device; For dimensionless coefficients and Reynolds numbers related; The seawater flow velocity (m / s) can be taken as the maximum value from historical data; The diameter or characteristic diameter (m) of the circular tube structure; The density of the fluid (seawater) (kg / m³) 3 ); Dynamic viscosity (Pa·s); as pipe diameter increases Increase and flow rate The increase, Consequently, the length of the eddy current suppression device increases. It is also necessary to add features to allow the ocean current to flow smoothly through the device, delay fluid separation, and prevent the generation of eddies.

[0041] In some embodiments, the frontal section 101 has a parabolic shape with a maximum width of 1.1 times the diameter D of the circular pipe; the tail section 102 has a polynomial curve shape, gradually decreasing in width to the tail end, with a tail end width of 0.05D. Applicable to Reynolds numbers of 10... 3 <Re<10 7 The range.

[0042] The eddy current suppression device 1 in this embodiment has a streamlined external structure, which can guide the water flow uniformly and stably across the surface, avoid the generation and shedding of eddies, and thus avoid structural resonance, ultimately ensuring structural safety. The streamlined structure can effectively reduce the water flow force on the circular tube structure. The opening movable part is provided at the flow-facing section 101, which has the characteristics of simple and convenient installation. The eddy current suppression device 1 is naturally suspended in the water and has the characteristic of self-floating. Underwater installation is convenient and labor-saving, and does not require large mechanical assistance. The eddy current suppression device 1 will rotate around the circular tube structure 2 as the water flow direction changes, and it always faces the flow direction. It is a passive steering device and does not require additional power.

[0043] Example 2: This embodiment provides a method for suppressing eddy currents in a circular tube structure, using a circular tube structure eddy current suppression device as described in Embodiment 1, including: water flow sequentially passing through the upstream section and the tail section, guiding the water flow through the surface of the eddy current suppression device to avoid the occurrence of eddy current-induced vibration.

[0044] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A circular tube structure eddy current suppression device, characterized in that, Including the interconnected frontal and rear sections; The upstream section is provided with through holes that can be fitted onto the circular tube structure; the tail section is provided with a honeycomb structure inside, which makes the entire vortex suppression device float in the seawater. The tail section has a gradually decreasing vertical cross-sectional area along the direction of water flow; The upstream section includes an arc-shaped head, first arc-shaped segments disposed on both sides of the arc-shaped head, and a second arc-shaped segment connected to the first arc-shaped segment; the arc-shaped head disperses the water flow to both sides of the vortex suppression device; the vertical cross-sectional area of ​​the vortex suppression device gradually increases in the direction of water flow, guiding the water flow to continue flowing away from the circular pipe structure; the radius of curvature of the second arc-shaped segment is greater than the radius of curvature of the first arc-shaped segment; the tail section includes a third arc-shaped segment connected to the second arc-shaped segment, a fourth arc-shaped segment connected to the third arc-shaped segment, and a tail connected to the fourth arc-shaped segment; the length of the tail section in the direction of water flow is greater than the length of the upstream section in the direction of water flow; the radius of curvature of the third arc-shaped segment is greater than the radius of curvature of the fourth arc-shaped segment; the length of the fourth arc-shaped segment in the direction of water flow is greater than the length of the third arc-shaped segment in the direction of water flow.

2. The eddy current suppression device with a circular tube structure as described in claim 1, characterized in that, The length of the eddy current suppression device is determined based on the diameter of the circular tube structure and the seawater flow velocity. ； ； ； in, The length of the eddy current suppression device; The coefficient is dimensionless. D is the seawater flow velocity; D is the diameter of the circular pipe structure. For fluid density; This refers to dynamic viscosity.

3. A method for suppressing eddy currents in a circular tube structure, characterized in that, Using the circular tube structure eddy current suppression device as described in any one of claims 1-2, the method includes: water flow sequentially passing through the upstream section and the tail section, guiding the water flow across the surface of the eddy current suppression device, and avoiding the occurrence of eddy current-induced vibration.

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