Cylindrical current collection structure segmented rotatable optimized cross section shell system

Abstract

The present application belongs to the field of fluid mechanics, ocean engineering and wind engineering structure flow field control technology, and discloses a segmented rotatable optimized cross-section shell system for a cylindrical flow-receiving structure, which is arranged on the outer wall of the cylindrical flow-receiving structure body and comprises a plurality of base rings, the plurality of base rings are equidistantly sleeved on the cylindrical flow-receiving structure body along the length direction of the cylindrical flow-receiving structure body; a plurality of shell segments are respectively corresponding to the plurality of base rings, the base rings are provided with rotating members, and the shell segments are rotatably installed on the base rings through the rotating members; each shell segment can rotate independently of other shell segments around the axis of the cylindrical flow-receiving structure body; and the cross section of the shell segment is a directional sensitive optimized cross section. The present application solves the problem that the traditional fixed or integral flow control shell is difficult to balance the direction adaptability, structural continuity and installation and maintenance convenience, thereby improving the drag reduction, vibration reduction and flow stabilization effect of the cylindrical flow-receiving structure in actual engineering.

Description

Technical Field

[0001] This invention belongs to the field of fluid mechanics, marine engineering and wind engineering structure flow field control technology, and particularly relates to a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structures. Background Technology

[0002] Cylindrical structures are widely used in marine engineering, wind engineering, and transportation engineering. Examples include subsea pipelines, marine risers, cylindrical components attached to submersible and floating structures, wind turbine towers, bridge cable protection components, and various flow-driven cylindrical supports. These structures are prone to boundary layer separation under fluid influence, forming alternating vortices in the wake region. This results in periodic drag fluctuations and lift pulsations, which, in severe cases, can lead to flow-induced vibrations, fatigue damage, loose connections, and decreased operational stability.

[0003] To improve the flow characteristics around a cylinder, various shape optimization methods and additional flow-rectifying components have been proposed in existing technologies. For example, numerical optimization can be used to obtain a non-circular cross-sectional shape with lower drag or lift oscillations, or external appendages such as fairings, spoilers, and flow-rectifying vanes can be added to the outside of the cylinder to reduce wake coherence and weaken vortex shedding intensity. These methods can achieve certain effects under specific directional flow conditions. However, existing technologies still have the following shortcomings: 1. Highly sensitive to direction For non-circular oriented sections obtained through shape optimization, their drag reduction, vibration reduction, or flow stabilization effects are usually closely related to the incoming flow direction. When the actual incoming flow direction deviates from the design direction, the flow control effect of the original shape decreases significantly, and new unfavorable separation states may even occur. Therefore, such optimized shapes often only exhibit superior effects under specific incoming flow directions.

[0004] 2. Difficult to adapt to complex three-dimensional incoming flow environments In marine and wind-prone environments, the incoming flow to a cylindrical structure is typically not a single, stable direction, but rather exhibits significant multidirectionality, time-varying characteristics, and spatial non-uniformity. For example, in a marine environment, influenced by ocean currents, wave currents, and their coupling effects, the direction and velocity of the incoming flow change with time and spatial location. In a wind-prone environment, influenced by natural wind fluctuations, wind direction changes, shear flow, diffraction, and interference from adjacent structures, the local incoming flow direction and velocity at different heights or lengths along the structure's axis may also be inconsistent. Existing monolithic fixed shells or monolithic directional shapes are insufficient to simultaneously adapt to localized incoming flow conditions at different locations.

[0005] 3. The integral rotating structure has insufficient adaptability. Even if some outer shells can rotate as a whole around a cylinder, they can usually only respond to the incoming flow at a uniform angle, and cannot adapt to the situation where there are different local flow direction angles at different positions along the axial direction of the same cylindrical structure. In other words, when slender cylindrical structures such as bridge cables, marine risers, subsea pipelines, or wind turbine towers are in environments with multi-directional wind flow, multi-directional wave flow, or their coupled and changing flow, the integral rotating structure still cannot meet the flow field control requirements at each axial position. Therefore, its flow control effect in complex incoming flow environments remains limited.

[0006] 4. Inconvenient installation and maintenance of the project For long cylindrical structures, the integral shell is difficult to manufacture, transport, install and maintain. Furthermore, the load on the integral components is concentrated, which can easily lead to local wear, vibration amplification and maintenance and replacement difficulties. It is difficult to meet the needs of modular installation, segmented maintenance and partial replacement in actual engineering.

[0007] Therefore, there is an urgent need for a cylindrical flow-receiving structure with a segmented, rotatable, optimized cross-section shell system to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a segmented, rotatable, optimized cross-section shell system for cylindrical flow-receiving structures to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides a segmented rotatable optimized cross-section shell system for a cylindrical flow receiving structure, disposed on the outer wall of the cylindrical flow receiving structure body, comprising: Multiple base collars are equally spaced on the cylindrical flow receiving structure body along the length direction of the cylindrical flow receiving structure body. Multiple outer shell segments correspond one-to-one with multiple base collars. Each base collar is provided with a rotating component, and the outer shell segments are rotatably mounted on the base collars via the rotating components. Furthermore, each outer shell segment can rotate independently of the other outer shell segments around the axis of the cylindrical flow-receiving structure body. The cross-section of the outer shell segment is an orientation-sensitive optimized section.

[0010] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structure is provided, wherein two limiting damping grooves are fixedly connected to both ends of the base collar, and a plurality of rolling balls are arranged circumferentially between the two limiting damping grooves, and the shell segment is rotatably connected to the base collar through the rolling balls.

[0011] According to the present invention, a segmented rotatable optimized cross-section shell system for a cylindrical flow receiving structure is provided, wherein the shell segment includes a rolling support ring, which is sleeved on the base collar and in contact with the rolling ball, and the shell body is installed on the outer wall of the rolling support ring.

[0012] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structure is provided, wherein the shell adopts a segmented assembly structure and is formed by at least two shell blocks.

[0013] According to the present invention, a segmented rotatable optimized cross-section shell system for a cylindrical flow receiving structure is provided. The overall cross-sectional profile of the shell body is fish-shaped, including a pointed leading edge for guiding the incoming flow on the flow-facing side, bulging transition portions on both sides of the middle of the cross-section, and a tail that gradually tapers backward.

[0014] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structure is provided, wherein the shell is configured to passively self-orient under the action of external fluid torque, so that the dominant flow direction of its optimized cross-section tends to be consistent with the local incoming flow direction.

[0015] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structure is provided, wherein both ends of the base collar are fixedly connected with axial anti-detachment limiting flanges.

[0016] According to the present invention, a segmented rotatable optimized cross-section shell system for a cylindrical flow receiving structure is provided, wherein a damping element is provided between two adjacent shell bodies.

[0017] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical flow receiving structure is provided, wherein the damping element is a flexible damping component.

[0018] According to the present invention, a segmented rotatable optimized cross-section shell system for cylindrical current-collecting structures is provided, wherein the cylindrical current-collecting structure body includes subsea pipelines, marine risers, bridge cables, wind turbine towers, or submersible structures with attached cylindrical components.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides a segmented, rotatable, optimized cross-section shell system for cylindrical flow-collecting structures. By arranging multiple independently rotatable shell segments at equal intervals along the cylindrical axis, each segment at different axial positions can adapt to the local flow direction at its respective location. This solves the problem of fixed optimized shapes being sensitive to the flow direction. Simultaneously, the directionally sensitive optimized cross-section, after directional matching, effectively improves flow characteristics, reduces drag and lift pulsation, and suppresses vortex-induced vibration. This invention addresses the difficulty of traditional fixed or integral flow-control shells in simultaneously achieving directional adaptability, structural continuity, and ease of installation and maintenance, thereby improving the drag reduction, vibration reduction, and flow stabilization effects of cylindrical flow-collecting structures in practical engineering applications. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base collar structure of the present invention; Figure 3 This is a schematic diagram of the outer shell section structure of the present invention; Figure 4 This is a schematic diagram of the damping component structure of the present invention; Figure 5 This is a schematic cross-sectional view of the overall structure of the present invention; The components are: 1. Cylindrical flow receiving structure body; 2. Base collar; 3. Outer shell section; 31. Rolling support ring; 32. Outer shell; 4. Axial anti-detachment limiting flange; 5. Limiting damping groove; 6. Rolling ball; 7. Damping component. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1-5This invention provides a segmented, rotatable, optimized cross-section shell system for a cylindrical flow-receiving structure, disposed on the outer wall of the cylindrical flow-receiving structure body 1, comprising: Multiple base rings 2 are equally spaced on the cylindrical flow receiving structure body 1 along the length direction of the cylindrical flow receiving structure body 1. Multiple outer shell segments 3 correspond one-to-one with multiple base collars 2. The base collars 2 are provided with rotating parts, and the outer shell segments 3 are rotatably mounted on the base collars 2 through the rotating parts; and each outer shell segment 3 can rotate independently of other outer shell segments 3 around the axis of the cylindrical flow receiving structure body 1. The cross-section of shell segment 3 is an orientation-sensitive optimized cross-section.

[0025] In one embodiment of the present invention, by arranging multiple independently rotatable shell segments 3 at equal intervals along the axial direction of the cylinder, the shell segments at different axial positions can adapt to the local incoming flow direction of their respective positions, thus solving the problem that the fixed optimized shape is sensitive to the incoming flow direction. At the same time, the orientation-sensitive optimized section can effectively improve the flow characteristics after direction matching, reduce drag and lift pulsation, and suppress vortex-induced vibration.

[0026] As an optional implementation, two limiting damping grooves 5 are fixedly connected to both ends of the base collar 2, and multiple rolling balls 6 are arranged circumferentially between the two limiting damping grooves 5. The outer shell section 3 is rotatably connected to the base collar 2 through the rolling balls 6.

[0027] In one embodiment of the present invention, the rolling ball 6 provides a low-friction rotary support, enabling the outer shell section 3 to rotate sensitively and smoothly under the action of fluid torque; the limiting damping groove 5 not only restricts the axial movement of the outer shell section 3, but also suppresses the high-frequency chattering or excessive oscillation of the shell section in the pulsating flow through damping, thereby improving rotational stability and long-term reliability.

[0028] As an optional implementation, the outer shell segment 3 includes a rolling support ring 31, which is sleeved on the base collar 2 and in contact with the rolling ball 6. The outer shell body 32 is installed on the outer wall of the rolling support ring 31.

[0029] In one embodiment of the present invention, the rolling support ring 31 and the rolling ball 6 directly cooperate to form a rotating pair, which ensures the coaxiality and smoothness of the outer shell 32 when rotating, while avoiding direct friction between the outer shell 32 and the base collar 2, thus extending the service life.

[0030] In one embodiment of the present invention, each outer shell segment 3 may be manufactured using metal materials, composite materials, polymer engineering plastics, or a hybrid structure of metal and composite materials. For marine environments, materials with good corrosion resistance, seawater erosion resistance, and biofouling resistance are preferred, and antifouling coatings, wear-resistant layers, or hydrophobic surface layers may be applied to the outer surface. For wind engineering applications such as bridge cables and wind turbine towers, lightweight, high-strength materials with good weather resistance are preferred to reduce added weight and maintenance costs.

[0031] The optimized cross-sectional shape of shell segment 3 can be achieved through methods such as compression molding, composite material layup molding, machining, welding assembly, casting, or 3D printing. For modular shells, each shell block can be manufactured separately and then mechanically connected to form a complete shell segment.

[0032] As an alternative implementation, the outer shell 32 adopts a segmented assembly structure, which is formed by at least two shell pieces.

[0033] In one embodiment of the present invention, to ensure the overall rigidity and geometric stability of the segmented assembled shell during rotation, each shell segment 3 may be equipped with an integrated or separate support frame. The support frame may be provided with several arc-shaped reinforcing ribs along the circumference and connecting beams or lightweight frames along the axial direction. The shell blocks of the shell segment 3 are fixed to the outside or inside of the support frame, so that the entire shell segment 3 maintains the outer contour of the optimized cross-section while having sufficient strength and resistance to deformation.

[0034] When assembling the outer shell section 3, the base collar 2 is first fixed to the outer periphery of the flow receiving structure body, and then the shell blocks with rotating support rings are sequentially assembled on the outside of the base collar 2. Finally, multiple shell blocks are assembled into a complete outer shell section 3 by means of flanges, bolts or snap-fit ​​structures. Disassembly is carried out in the reverse order, thereby realizing modular installation and maintenance.

[0035] As an alternative implementation, the overall cross-sectional profile of the outer shell 32 is fish-shaped, including a pointed leading edge for guiding the incoming flow on the front side, bulging transition portions on both sides of the middle of the cross-section, and a tail that gradually tapers backward.

[0036] In one embodiment of the present invention, the fish-shaped optimized cross-section has excellent flow guiding performance: the pointed leading edge reduces the stagnant zone at the front and guides fluid adhesion, the bulging parts on both sides delay boundary layer separation, and the contracting tail inhibits the alternating shedding of vortices in the wake region. Compared with circular or ordinary non-circular cross-sections, this shape can significantly reduce pressure drag and vortex-induced lift after directional matching, achieving the effects of drag reduction, vibration reduction, and flow stabilization.

[0037] As an alternative implementation, the outer casing 32 is configured to passively self-orient under the action of external fluid torque, such that the dominant flow direction of its optimized cross-section tends to be consistent with the local incoming flow direction.

[0038] In one embodiment of the present invention, when an external flow acts on the outer shell section 3, due to the different pressure distribution and fluid torque at different angles of the optimized cross section, the outer shell section 3 will automatically rotate around the axis of the receiving structure body under the action of the fluid torque until the dominant flow direction of its optimized cross section tends to be consistent with the local flow direction at its axial position, or a stable angle is reached where the fluid torque and damping torque are balanced.

[0039] Since the local flow direction of a cylindrical flow-receiving structure may differ at different positions along the axial direction in a complex environment, each outer shell segment 3 can independently adjust its angle. In this way, the outer shell segment 3 near a certain axial position can face the local flow at that position, while the outer shell segment 3 at another axial position can face a different flow direction, thereby avoiding the directional mismatch problem caused by a uniform overall steering.

[0040] In another embodiment, each outer shell segment 3 may also be equipped with an active drive mechanism, such as a micro motor, gear transmission mechanism, chain transmission mechanism, or hydraulic drive mechanism, and work in conjunction with a flow direction sensor, pressure sensor, displacement sensor, and control unit to achieve active orientation. The active approach can be used to enhance control in situations where the incoming flow changes frequently or where high angle control accuracy is required. However, the preferred main solution of this invention remains a passive self-orienting structure.

[0041] As an optional implementation, both ends of the base collar 2 are fixedly connected with axial anti-disengagement limiting flanges 4.

[0042] In one embodiment of the present invention, the axial anti-detachment limiting flange 4 serves as a mechanical stop structure, which can effectively prevent the outer shell section 3 from detaching from the base collar during long-term operation or when subjected to axial impact, thereby enhancing the axial safety of the system. It is particularly suitable for marine engineering scenarios with severe vibration environments or waves and water flow impacts.

[0043] As an optional implementation, a damping element 7 is provided between two adjacent outer shells 32.

[0044] In one embodiment of the present invention, the inter-segment damping element 7 can absorb and buffer the relative motion energy between adjacent shell segments 3 caused by fluid disturbance or asynchronous rotation, prevent rigid collisions or excessive misalignment between shell segments, and improve the overall coordination and operational stability of the multi-segment system in complex inflow environments.

[0045] As an optional implementation, the damping element 7 is a flexible damping assembly.

[0046] In one embodiment of the present invention, the flexible damping component (such as a rubber ring or elastic connecting strip) ensures that each outer shell segment 3 has a certain degree of independent rotational freedom while maintaining the continuity of the axial connection. It can also adapt to small relative deflections and displacements between segments, combining damping, limiting, and sealing functions. The structure is simple and easy to replace. The combination of the flexible connecting strip and the end-face limiting boss / limiting groove ensures that each segment has independent orientation capability while preventing excessive relative deflection between adjacent shell segments due to local fluid disturbances.

[0047] As an optional implementation, the cylindrical current-receiving structure body 1 includes a submarine pipeline, a marine riser, a bridge cable, a wind turbine tower, or a cylindrical component attached to a submerged or floating structure.

[0048] In one embodiment of the present invention, the invention is applicable to various typical slender cylindrical flow-receiving structures, covering the fields of marine engineering, wind engineering, and transportation engineering. Under different application scenarios, the segmented rotatable optimized cross-section shell system can adaptively adjust to local multidirectional flow, demonstrating broad technical versatility and industrial application value.

[0049] In one embodiment of the present invention, when an external fluid acts on the receiving structure, the local flow direction at different axial positions may not be consistent. For example, in bridge cables, due to changes in wind direction, pulsating wind, diffraction, and wind shear at different heights, the local wind direction may deviate; in subsea pipelines and marine risers, due to ocean currents, wave currents, and their coupling effects, the local flow direction at different length positions may also differ.

[0050] Multiple outer shell segments 3 are installed at different axial positions, and each outer shell segment 3 can rotate independently via a bearing ring-type rotating connection assembly. Thus, under the influence of fluid, each outer shell segment 3 will adjust its angle under the action of local fluid torque, making the dominant flow direction of the corresponding optimized cross-section align with the local incoming flow direction at that location. Because the optimized cross-section has guiding characteristics of a sharp leading edge, bulging sides, and a converging tail, after directional matching, it can guide streamlines to more smoothly bypass the outer shell segment 3, reducing local separation, lowering the intensity of alternating wake vortices, and reducing drag fluctuations and lift pulsations.

[0051] Meanwhile, the inter-segment flexible damping connection suppresses excessive misalignment and collision between adjacent shell segments 3; the limiting damping groove 5 suppresses the back-and-forth swaying of the shell segment 3 in time-varying incoming flow; and the axial anti-detachment limiting flange 4 ensures the axial safety of the entire shell system during long-term operation, enabling continuous control of the external flow field of the cylindrical flow receiving structure in complex multi-directional incoming flow environments.

[0052] In one embodiment of this invention, the invention is applied to a subsea pipeline, with multiple outer shell sections 3 distributed axially along the pipeline. When the subsea pipeline is in an environment of ocean currents, wave currents, or wave-current coupled environments, the local flow direction may differ at different locations. Each outer shell section 3 rotates under the action of local fluid torque, causing the leading edge of the optimized cross-section of each section to face the corresponding local incoming flow, while the tail faces the local downstream direction. This reduces the impact zone at the front of the outer shell, decreases the separation strength on both sides, and improves the flow stability in the wake region. For long-distance applications of subsea pipelines, the segmented assembly structure facilitates on-site external installation. When a part of the outer shell is damaged, only the corresponding outer shell section 3 needs to be disassembled and replaced, without having to dismantle the entire outer shell system.

[0053] In one embodiment of the present invention, applied to bridge cables, multiple outer shell segments 3 are sequentially arranged along the height direction of the cable. Under the influence of natural wind, bridge cables often experience varying local wind directions, speeds, and turbulence intensities along their height. Traditional fixed-direction guiding shells are ill-suited to adapt to changes in the angle of incoming flow along the height direction. However, each outer shell segment 3 of the present invention can be individually adjusted in orientation, ensuring that the optimized cross-sections at different height positions align as closely as possible with the corresponding local wind direction. This improves the flow separation state on the cable surface, reducing wake instability and the risk of wind-induced vibration.

[0054] This invention provides a segmented, rotatable, optimized cross-section shell system for cylindrical flow-receiving structures. By setting multiple independently rotatable optimized cross-section shell segments 3 along the cylindrical axis, the shell segments at different locations can adapt to different local flow directions, overcoming the sensitivity problem of fixed optimized shape orientation. Compared to integral rotating shells, the segmented structure of this invention can adapt to the problem of inconsistent axial flow direction under complex conditions such as shear flow, wave-current coupling, turbulent disturbance, and local flow direction deflection. By ensuring that the optimized cross-section is always aligned with the local flow direction as much as possible, the optimized cross-section can fully play its role in drag reduction, separation suppression, and lift pulsation reduction. The segmented shell is easy to manufacture, transport, assemble, replace, and maintain, and is especially suitable for on-site installation of long cylindrical structures. By setting damping, limiting, anti-detachment, and locking structures, the risks of shell segment fluttering, inter-segment collisions, and abnormal deflection are reduced, improving long-term service reliability. It can adopt a purely passive self-orientation method or an active or semi-active locking method depending on the application scenario, and is suitable for various environments such as marine and wind farms.

[0055] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0056] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A segmented, rotatable, optimized cross-section shell system for a cylindrical flow-receiving structure, disposed on the outer wall of the cylindrical flow-receiving structure body (1), characterized in that, include: Multiple base rings (2) are equally spaced on the cylindrical flow receiving structure body (1) along the length direction of the cylindrical flow receiving structure body (1); Multiple outer shell segments (3) correspond one-to-one with multiple base collars (2). A rotating component is provided on the base collar (2). The outer shell segments (3) are rotatably mounted on the base collar (2) through the rotating component. Each outer shell segment (3) can rotate independently of the other outer shell segments (3) around the axis of the cylindrical flow receiving structure body (1). The cross section of the outer shell segment (3) is a directionally sensitive optimized cross section.

2. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 1, characterized in that: The base collar (2) is fixedly connected to two limiting damping grooves (5) at both ends. Multiple rolling balls (6) are arranged circumferentially between the two limiting damping grooves (5). The outer shell section (3) is rotatably connected to the base collar (2) through the rolling balls (6).

3. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 2, characterized in that: The outer shell section (3) includes a rolling support ring (31), which is sleeved on the base collar (2) and is in contact with the rolling ball (6). The outer shell body (32) is installed on the outer wall of the rolling support ring (31).

4. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 3, characterized in that: The outer shell (32) adopts a segmented assembly structure, which is formed by at least two shell pieces.

5. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 3, characterized in that: The overall cross-sectional profile of the outer shell (32) is fish-shaped, including a pointed leading edge for guiding the incoming flow on the front side, bulging transition portions on both sides of the middle of the cross-section, and a tail that gradually tapers backward.

6. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 3, characterized in that: The outer shell (32) is configured to passively self-orient under the action of external fluid torque, so that the dominant flow direction of its optimized cross section tends to be consistent with the local incoming flow direction.

7. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 2, characterized in that: Both ends of the base collar (2) are fixedly connected to axial anti-disengagement limiting flanges (4).

8. The cylindrical flow-receiving structure segmented rotatable optimized cross-section shell system according to claim 3, characterized in that: A damping element (7) is provided between two adjacent outer shells (32).

9. A segmented rotatable optimized cross-section shell system for cylindrical flow-receiving structures according to claim 8, characterized in that: The damping component (7) is a flexible damping assembly.

10. A segmented rotatable optimized cross-section shell system for cylindrical flow-receiving structures according to claim 1, characterized in that: The cylindrical current-receiving structure body (1) includes a submarine pipeline, a marine riser, a bridge cable, a wind turbine tower, or a submerged or floating structure with attached cylindrical components.

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