Suspension type experimental device for simulating vortex-induced vibration of pi type cross-over pipe under multi-angle uniform flow

Abstract

The application provides a kind of simulation multi-angle uniform flow under π type jumper vortex-induced vibration suspension type experimental device, comprising: deep sea π type jumper model, rigid boundary constraint fixed module, rigid frame support module, rigid frame stress positioning module, rotating positioning support plate module, host computer control module and measurement module;Deep sea π type jumper model is fixed at rigid boundary constraint fixed module on both ends, rigid boundary constraint fixed module is fixed on rigid frame support module, rigid frame stress positioning module is fixedly connected with rigid frame support module after passing through rotating positioning support plate module, the edge of rotating positioning support plate module is fixed to the edge of circulating water tank, host computer control module generates flow according to set flow rate, and measurement module measures the vibration data of deep sea π type jumper model.The device provided by the application can simulate the flow angle from 0° to 90°, realize the flow field simulation of multi-angle uniform flow, and be closer to the real flow field situation.

Description

Technical Field

[0001] This invention relates to the field of marine experimental equipment technology, specifically to a suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under a uniform flow at multiple angles. Background Technology

[0002] Pi-type jumpers, serving as the medium connecting subsea oil and gas wellheads, are essential key equipment in the field of marine engineering. Marine pipelines in marine engineering typically have a cylindrical structure. Under the influence of ocean currents, these cylindrical structures experience alternating vortex releases on both sides, generating periodically changing pulsating forces. This cyclically changing alternating stress induces vibration in the suspended column of the π-type jumper, which in turn affects the wake structure of the ocean current, creating a nonlinear, self-regulated, or self-governed multi-degree-of-freedom phenomenon. When the vortex discharge frequency is close to or the same as the natural frequency of the π-type jumper, resonance occurs, significantly increasing the structure's amplitude—vortex-induced vibration. Vortex-induced vibration is a significant factor leading to fatigue damage in marine π-type jumpers.

[0003] Most domestic research currently focuses on theoretical analysis and CFD (Computational Fluid Dynamics) simulations. However, since the vortex-induced vibration of π-type crosspipes is a high Reynolds number turbulence problem, computer simulations are computationally intensive and highly unstable, their accuracy is questionable, and their practicality is limited. Further development based on experiments is still necessary. Previous experimental studies have mainly focused on vortex-induced vibration simulations of straight or suspended pipes in a single direction under uniform or shear flow. Experimental studies on underwater π-type crosspipes with multi-directional vortex discharge and mixed torsional responses are scarce, and studies on different directions of upstream flow have not been conducted.

[0004] In Chinese patent document CN109296356A, a real-time monitoring and automatic alarm device for vortex-induced vibration of a seabed steel cross-pipe is disclosed. The research object also involves the vortex-induced vibration of a π-type cross-pipe. It only focuses on the real-time monitoring and automatic alarm of vortex-induced vibration of the seabed steel π-type cross-pipe, and does not show the function of simulating multi-directional upstream flow and uniform flow near the seabed in the vortex-induced vibration of the π-type cross-pipe. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under multi-angle uniform flow.

[0006] According to the present invention, a suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under multi-angle uniform flow includes: a deep-sea π-type cross-pipe model, a rigid boundary constraint fixing module, a rigid frame support module, a rigid frame force positioning module, a rotary positioning support plate module, a host computer control module, and a measurement module.

[0007] The deep-sea π-shaped cross-connector model is fixed at both ends on the rigid boundary constraint fixing module, which is fixed on the rigid frame support module. The rigid frame force positioning module can rotate through the rotary positioning support plate module and is fixedly connected to the rigid frame support module. The edge of the rotary positioning support plate module is fixed to the edge of the circulating water tank. The host computer control module creates flow at the bottom of the water tank according to a set flow rate. The measurement module measures the vibration data of the deep-sea π-shaped cross-connector model.

[0008] Preferably, the deep-sea π-type cross-connector model includes a central pipe, a pipe joint, a heat shrink tubing, and a fiber optic strain gauge train;

[0009] Two pairs of fiber optic strain gauge strings are pre-embedded on the surface of the central tube, and the heat shrink tubing is wrapped around the central tube and the fiber optic strain gauge strings.

[0010] Preferably, the rigid boundary constraint fixing module includes a first necked flange, a baffle plate, and a three-part force sensor;

[0011] The deep-sea π-type jumper model is fixedly connected at both ends to the neck of the first necked flange, the first necked flange is fixedly connected to the three-part force sensor, and the baffle is nested outside the three-part force sensor.

[0012] Preferably, the rigid frame support module includes a second neck flange, a rigid frame, and a connecting plate;

[0013] The second necked flange is fixed to the rigid frame with bolts; the connecting plate is fixedly connected to the rigid frame, and the baffle plate and the three-part force sensor are respectively fixed to the connecting plate of the rigid frame support module.

[0014] Preferably, the rigid frame force positioning module includes a force-applying handle, a cantilever rod, a positioning rod, a connecting rod, and a third neck flange; the force-applying handle, cantilever rod, and connecting rod together form a T-shaped handle; the cantilever rod is fixedly connected to the connecting rod; the connecting rod is fixedly connected to the positioning rod; and the connecting rod is fixedly connected to the neck of the third neck flange.

[0015] Preferably, the rigid frame force positioning module adopts a left-right symmetrical structure.

[0016] Preferably, the rotary positioning support plate module includes a rotary positioning support plate, a connecting hole, and a positioning hole;

[0017] The connecting holes are located at both ends and the middle of the rotating positioning support plate, respectively. The connecting holes at both ends are used to fix the rotating positioning support plate to the edge of the water tank. The connecting rod of the rigid frame force positioning module passes through the middle connecting hole of the rotating positioning support plate and is connected to the neck of the second neck flange of the rigid frame support module. By applying an upward force to the force-applying handles on both sides of the rigid frame force positioning module and rotating it to different positioning holes on the rotating positioning support plate module, the positioning rod is inserted into the positioning hole and fixed by the gravity of the device itself.

[0018] Preferably, the host computer control module includes an industrial control computer, an intelligent flow control system, and a flow generation system; the operator inputs a constant flow velocity into the industrial control computer, and the industrial control computer issues motion commands to the intelligent flow control system, thereby controlling the flow generation system to form the required uniform flow field.

[0019] Preferably, the measurement module includes a fiber Bragg grating demodulator, an I / O unit, a storage unit, a wireless unit, and a receiving unit;

[0020] The fiber optic grating demodulator demodulates the vibration strain signal from the fiber optic strain train distributed and pre-embedded in the deep-sea π-type cross-pipe model. The IO unit converts the analog signal from the three-part force sensor of the rigid boundary constraint fixing module into a digital signal. The storage unit stores the signal, and the wireless unit sends the stored data to the receiving unit to complete the dynamic strain and force response measurement.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The experimental device of the present invention has a simple structure and low complexity. The device can be suspended in the water tank, making it convenient to change the working conditions. It does not need to be operated in the water, saving the time of pumping water out of the water tank.

[0023] 2. The device of the present invention is sturdy and has good structural stability. The conical structure of the positioning rod buckle makes it easier to lock and avoids the impact of device shaking on the test data.

[0024] 3. The device of the present invention has a significant difference between its natural frequency and the period of vortex-induced vibration, and will not produce experimental errors due to resonance.

[0025] 4. The device provided by this invention can simulate the flow angle from 0° to 90°, realize the flow field simulation of multi-angle uniform flow, and more closely resemble the real flow field situation. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the experimental apparatus disclosed in this invention;

[0028] Figure 2 This is a three-dimensional schematic diagram of the experimental apparatus disclosed in this invention fixed in a water tank;

[0029] Figure 3 This is a three-dimensional schematic diagram of the deep-sea π-type cross-connector model in this invention;

[0030] Figure 4 This is a three-dimensional schematic diagram of the rigid boundary constraint fixing module in this invention;

[0031] Figure 5 This is a three-dimensional schematic diagram of the rigid frame support module in this invention;

[0032] Figure 6 This is a three-dimensional schematic diagram of the rigid frame force positioning module in this invention;

[0033] Figure 7 This is a three-dimensional schematic diagram of the rotary positioning support plate module in this invention;

[0034] Figure 8 This is a schematic diagram of the host computer control module in this invention;

[0035] Figure 9 This is a schematic diagram of the measurement module in this invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] Deep-sea π-type jumper model 1 Connecting rod 44

[0038] Center fitting 11 Third neck flange 45

[0039] Pipe fitting 12 Rotary positioning support plate module 5

[0040] Heat shrink tubing 13 Rotary positioning support plate 51

[0041] Fiber Bragg grating strain gauge 14, connecting hole 52

[0042] Rigid boundary constraint fixing module 2, positioning hole 53

[0043] First neck flange 21, host computer control module 6

[0044] 22 Baffle plate, 61 Industrial control computer

[0045] Three-part force sensor 23 Intelligent flow control system 62

[0046] Rigid frame support module 3 Flow generation system 63

[0047] Second neck flange 31 Measurement module 7

[0048] Rigid frame 32 Fiber optic demodulator 71

[0049] Connector board 33 IO input unit 72

[0050] Rigid frame force positioning module 4 Storage unit 73

[0051] Force grip 41 Wireless unit 74

[0052] Cantilever rod 42, receiving unit 75

[0053] Positioning rod 43 Detailed Implementation

[0054] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0055] This invention discloses a suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under multi-angle uniform flow, such as... Figure 1 As shown, it includes a deep-sea π-type cross-connector model 1, a rigid boundary constraint fixing module 2, a rigid frame support module 3, a rigid frame force positioning module 4, a rotation positioning support plate module 5, a host computer control module 6, and a measurement module 7.

[0056] The deep-sea π-type crossover model 1 is fixed at both ends to the rigid boundary constraint fixing module 2 via flanges. The rigid boundary constraint fixing module 2 is fixed to the rigid frame support module 3 via bolt flanges. The connecting rod of the rigid frame force positioning module 4 passes through the middle connecting hole of the rotating positioning support plate and is bolted to the second neck flange 31 of the rigid frame support module 3. The edge of the rotating positioning support plate module 5 is bolted to the edge of the circulating water tank. The host computer control module 6 generates flow according to the set flow rate. It applies an upward force to the rigid frame force positioning module 4 and rotates it to different positioning holes on the rotating positioning support plate module 5. Then, the force is removed and the positioning rod is inserted into the outer positioning hole by the gravity of the device itself. Then, the third neck flange 45 on the rigid frame force positioning module 4 is fixed to the inner ring positioning hole on the rotating positioning support plate module 5 via bolts. Finally, the simulation of the near-seabed uniform flow field of the π-type crossover under multi-angle headwinds is realized.

[0057] like Figure 2As shown, the two ends of the rotating positioning support plate module 5 are fixed to the edge of the circulating water tank by bolts.

[0058] like Figure 3 As shown, the deep-sea π-type jumper model 1 includes a central tube 11, a tube connector 12, a heat shrink tubing 13, and fiber optic strain gauge strings 14. Two pairs of fiber optic strain gauge strings 14 are pre-embedded and attached to the surface of each segment of the central tube 11 perpendicular to the plane of the π-type jumper. The heat shrink tubing 13 wraps around the central tube 11 and the fiber optic strain gauge strings 14.

[0059] like Figure 4 As shown, the rigid boundary constraint fixing module 2 includes: a first necked flange 21, a baffle plate 22, and a force sensor 23. The two ends of the deep-sea π-type jumper model 1 are bolted to the neck of the first necked flange 21, the flange of the first necked flange 21 is bolted to the force sensor 23, and the baffle plate 22 is nested outside the force sensor 23.

[0060] like Figure 5 As shown, the rigid frame support module 3 includes: a second neck flange 31, a rigid frame 32, and a connecting plate 33. The second neck flange 31 is fixed to the rigid frame 32 by bolts; the connecting plate 33 is connected to the rigid frame 32 by bolts. The baffle 22 and the three-part force sensor 23 are respectively fixed to the connecting plate 33 of the rigid frame support module 3 by bolts.

[0061] like Figure 6 As shown, the rigid frame force-bearing positioning module 4 includes: a force-applying handle 41, a cantilever rod 42, a positioning rod 43, a connecting rod 44, and a third neck flange 45. The force-applying handle 41, cantilever rod 42, and connecting rod 44 together form a T-shaped handle; the cantilever rod 42 and connecting rod 44 are fixed together by welding; the connecting rod 45 and positioning rod 43 are fixed together by welding; the neck of the connecting rod 44 and the third neck flange 45 are bolted together. The overall rigid frame force-bearing positioning module adopts a symmetrical structure, which facilitates the simultaneous application of force on both sides without causing the device to become unstable.

[0062] like Figure 7As shown, the rotary positioning support plate module 5 includes: a rotary positioning support plate 51, connecting holes 52, and positioning holes 53. The connecting holes 52 are located at both ends and the middle of the rotary positioning support plate 51, respectively. The connecting holes 52 at both ends are used to fix the rotary positioning support plate 51 to the edge of the water tank by bolts. The connecting rod 44 of the rigid frame force-bearing positioning module 4 passes through the middle connecting hole 52 of the rotary positioning support plate 51 and is connected to the neck of the second neck flange 31 of the rigid frame support module 3 by bolts. By applying an upward force to the force-applying handles 41 on both sides of the rigid frame force-bearing positioning module 4 and rotating it to different positioning holes 53 on the rotary positioning support plate module 5, the force is then removed and the positioning rod 43 is inserted into the positioning hole 53 and fixed by the weight of the device itself. At the same time, the third neck flange 45 of the rigid frame force-bearing positioning module 4 is connected to the corresponding inner ring positioning hole on the rotary positioning support plate module 5 by bolts, thereby further strengthening the fixation and finally realizing the multi-directional flow-facing rotary positioning of the π-type cross-connector.

[0063] like Figure 8 As shown, the host computer control module 6 includes an industrial control computer 61, an intelligent flow control system 62, and a flow generation system 63. The operator inputs a steady flow velocity into the industrial control computer 61, which then issues motion commands to the intelligent flow control system 62, thereby controlling the flow generation system 63 to form the required uniform flow field.

[0064] like Figure 9 As shown, the measurement module 7 includes a fiber Bragg grating demodulator 71, an I / O unit 72, a storage unit 73, a wireless unit 74, and a receiving unit 75. The fiber Bragg grating demodulator 71 demodulates the vibration strain signal from the fiber Bragg grating strain train 14 distributed and pre-embedded in the deep-sea π-type cross-connector model. The I / O unit 72 converts the analog signal from the three-part force sensor 23 of the rigid boundary constraint fixing module into a digital signal. Both are synchronously stored by the storage unit 73. The wireless unit 74 sends the stored data to the receiving unit 75, completing the dynamic strain and force response measurement.

[0065] The manufacturing and installation process of this embodiment is as follows:

[0066] Before the formal experiment, appropriate similarity criteria, model scaling ratios, and suitable experimental conditions were selected based on the actual dimensions of the deep-sea π-type cross-connector, the specific test conditions, the dimensions of the laboratory circulating water tank, and the economic feasibility of the experiment. Based on the strength and stiffness requirements of the experimental setup under the experimental conditions, suitable materials and dimensions for each module were selected. After all modules of the experimental setup were fabricated, the detailed installation steps are as follows:

[0067] First, the rotary positioning support plate module 5, the rigid frame support module 3, and the rigid frame force-bearing positioning module 4 are assembled by cutting and welding steel according to their dimensions. Then, the neck flanges of the rigid frame support module 3 and the rigid frame force-bearing positioning module 4 are fixed to their respective positions with bolts.

[0068] Secondly, the two ends of the rotating positioning support plate 51 are fixed to the edge of the water tank with bolts.

[0069] Then, the first neck flange 21 is connected to the three-part force sensor 23 by bolts, and the baffle plate 22 is nested outside the three-part force sensor 23 to complete the assembly of the rigid boundary constraint fixing module 2.

[0070] Meanwhile, the assembled deep-sea π-type cross-connector model 1 is fixed by screws to the neck of the first necked flange 21 of the rigid boundary constraint fixing module 2.

[0071] Furthermore, after the connecting rod 44 of the rigid frame force-bearing positioning module 4 passes through the middle connecting hole 52 of the rotary positioning support plate 51, it is bolted to the neck of the second neck flange 31 of the rigid frame support module 3. The positioning rod 43 of the rigid frame force-bearing positioning module 4 is pushed into the positioning hole 53 by the weight of the device itself, and the third neck flange 45 on the connecting rod 44 is bolted to the inner ring positioning hole 53 of the rotary positioning support plate 51 to make the positioning more stable, thereby forming a complete suspended rotary positioning support structure.

[0072] Finally, after the entire experimental device is installed, water can be added to the tank. After debugging, the flow generation system can be started for testing according to specific working conditions and experimental technical requirements. After the working condition test at each angle is completed, the bolts used to fix the third necked flange 45 on the connecting rod 44 to the inner ring positioning hole 53 of the rotary positioning support plate 51 can be unscrewed. By applying an upward force to the force-applying handle of the device, the positioning rod 43 is disengaged from the positioning hole 53. Then, after rotating the device to a position where the positioning rod 43 is vertically aligned with the next positioning hole 53, the external force is slowly released, allowing the positioning rod 43 to be pressed into the positioning hole 53 by its own weight. Then, the third necked flange 45 on the connecting rod 44 is fixed to the corresponding inner ring positioning hole 53 on the rotary positioning support plate 51 with bolts, completing the change of the flow angle.

[0073] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "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. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0074] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under uniform flow at multiple angles, characterized in that, include: The deep-sea π-type cross-connector model (1), rigid boundary constraint fixing module (2), rigid frame support module (3), rigid frame force positioning module (4), rotary positioning support plate module (5), host computer control module (6), and measurement module (7). The deep-sea π-type cross-connector model (1) is fixed at both ends on the rigid boundary constraint fixing module (2), the rigid boundary constraint fixing module (2) is fixed on the rigid frame support module (3), the rigid frame force positioning module (4) can rotate through the rotating positioning support plate module (5) and is fixedly connected to the rigid frame support module (3), the edge of the rotating positioning support plate module (5) is fixed to the edge of the circulating water tank, the host computer control module (6) creates flow at the bottom of the water tank according to the set flow rate, and the measurement module (7) measures the vibration data of the deep-sea π-type cross-connector model (1); The rigid boundary constraint fixing module (2) includes a first neck flange (21), a baffle (22), and a three-part force sensor (23). The deep-sea π-type cross-pipe model (1) is fixedly connected at both ends to the neck of the first necked flange (21), the first necked flange (21) is fixedly connected to the three-part force sensor (23), and the baffle plate (22) is nested outside the three-part force sensor (23); The rotating positioning support plate module (5) includes a rotating positioning support plate (51), a connecting hole (52), and a positioning hole (53); The connecting holes (52) are located at both ends and the middle of the rotating positioning support plate (51); the connecting holes (52) at both ends are used to fix the rotating positioning support plate (51) to the edge of the water tank; the connecting rod (44) of the rigid frame force positioning module (4) passes through the middle connecting hole (52) of the rotating positioning support plate (51) and is connected to the neck of the second neck flange (31) of the rigid frame support module (3). By applying an upward force to the force-applying handles (41) on both sides of the rigid frame force positioning module (4) and rotating it to different positioning holes (53) on the rotating positioning support plate module (5), the positioning rod (43) is inserted into the positioning hole (53) and fixed by the gravity of the device itself.

2. The suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under uniform flow at multiple angles as described in claim 1, characterized in that, The deep-sea π-type cross-pipe model (1) includes a central pipe (11), a pipe joint (12), a heat shrink tubing (13), and a fiber optic strain gauge train (14). Two pairs of fiber optic strain gauge strings (14) are pre-embedded on the surface of the central tube (11), and the heat shrink tubing (13) is wrapped around the central tube (11) and the fiber optic strain gauge strings (14).

3. The suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under uniform flow at multiple angles as described in claim 1, characterized in that, The rigid frame support module (3) includes a second neck flange (31), a rigid frame (32), and a connecting plate (33). The second neck flange (31) is fixed together with the rigid frame (32) by bolts; the connecting plate (33) is fixedly connected to the rigid frame (32), and the baffle plate (22) and the three-part force sensor (23) are respectively fixed to the connecting plate (33) of the rigid frame support module (3).

4. The suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under multi-angle uniform flow as described in claim 1, characterized in that, The rigid frame force positioning module (4) includes a force-applying handle (41), a cantilever rod (42), a positioning rod (43), a connecting rod (44), and a third neck flange (45); the force-applying handle (41), the cantilever rod (42), and the connecting rod (44) together form a T-shaped handle; the cantilever rod (42) is fixedly connected to the connecting rod (44); the connecting rod (44) is fixedly connected to the positioning rod (43); and the connecting rod (44) is fixedly connected to the neck of the third neck flange (45).

5. The suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under multi-angle uniform flow as described in claim 4, characterized in that, The rigid frame force positioning module (4) adopts a left-right symmetrical structure.

6. The suspended experimental apparatus for simulating vortex-induced vibration of a π-type cross-pipe under uniform flow at multiple angles according to claim 1, characterized in that, The host computer control module (6) includes an industrial control computer (61), an intelligent flow control system (62), and a flow generation system (63). The operator inputs a constant flow velocity into the industrial control computer (61), and the industrial control computer (61) issues motion commands to the intelligent flow control system (62), thereby controlling the flow generation system (63) to form the required uniform flow field.

7. The suspended experimental device for simulating vortex-induced vibration of a π-type cross-pipe under uniform flow at multiple angles according to claim 1, characterized in that, The measurement module (7) includes a fiber optic demodulator (71), an I / O unit (72), a storage unit (73), a wireless unit (74), and a receiving unit (75). The fiber grating demodulator (71) demodulates the vibration strain signal from the fiber grating strain string 14 distributed and pre-embedded in the deep-sea π-type cross-pipe model. The IO unit (72) converts the analog signal from the three-part force sensor (23) of the rigid boundary constraint fixing module into a digital signal. The storage unit (73) is used to store the signal. The wireless unit (74) sends the stored data to the receiving unit (75) to complete the dynamic strain and force response measurement.

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