CN104790881B - A kind of vortex-induced vibration of marine riser restraining device - Google Patents
A kind of vortex-induced vibration of marine riser restraining device Download PDFInfo
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- CN104790881B CN104790881B CN201510091947.2A CN201510091947A CN104790881B CN 104790881 B CN104790881 B CN 104790881B CN 201510091947 A CN201510091947 A CN 201510091947A CN 104790881 B CN104790881 B CN 104790881B
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- 230000000452 restraining effect Effects 0.000 title claims abstract description 35
- 230000009286 beneficial effect Effects 0.000 claims abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 8
- 239000006185 dispersion Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/0005—Baffle plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
- F15D1/0085—Methods of making characteristic surfaces for influencing the boundary layer
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The present invention discloses a kind of vortex-induced vibration of marine riser restraining device, comprise V-arrangement front console and V-arrangement rear end panel, described V-arrangement front console is arranged on to the one side that ocean current flows to above marine riser, and described V-arrangement rear end panel is arranged on marine riser back to the one side that ocean current flows to; The cross section of described V-arrangement front console and described V-arrangement rear end panel is all V-shaped, and respectively with the plane tangent of described marine riser.The invention has the beneficial effects as follows: the V-wing plate installed on V-arrangement front console, swing by a small margin can be done along with current, while guiding incoming flow dispersion, the resistance of incoming flow to marine riser can be reduced, effective suppression vortex-induced vibration, improves the fatigue life of standpipe.
Description
Technical field
What the present invention relates to is a kind of vortex-induced vibration of marine riser restraining device, belongs to sea oil drilling and production equipment technology field.
Background technology
Due to need of production, Offshore Oil Industry builds production system towards darker marine site.Along with the increase of the depth of water, the platform of conventional fixed-type can not adapt to this deep-sea engine request, the substitute is FPSO, semisubmersible platform, tension leg platform (TLP) and Spar platform etc.Wherein, FPSO (FloatingProductionStorageandOffloading) i.e. floating type production, storage and offloading device, can carry out preparatory processing to crude oil and store, be called as " offshore oil factory "; Semisubmersible drilling platform, also known as column stable offshore boring island, be most of buoyancy aid not in the mobile drilling platform of undersurface a kind of small-waterplane-area, develop from bottom founded rig; Spar platform is open side type platform.
No matter which kind of platform, marine riser is inevitable, and its connects seabed pipeline resource and offshore work platform, carries out drilling, drain, leads bricklayer's's work.When wave and ocean current flow through standpipe, under certain flow conditions, can alternately form strong whirlpool in standpipe both sides, vortex shedding can produce the variable force of one-period to standpipe, standpipe is made oscillation crosswise to occur, i.e. vortex-induced vibration with flowing in vertical direction; The vibration of structure conversely again stream field have an impact, whirlpool is strengthened, and resistance increases, and this vortex-induced vibration is the imbody of small scale parts fluid structurecoupling phenomenon.
Except oscillation crosswise, fluid resistance can make standpipe streamwise generation extensional vibration, but in the ordinary course of things, extensional vibration is less than oscillation crosswise amplitude.When vortex shedding frequency and standpipe intrinsic frequency close to time, the judder of standpipe will be caused, the process that comes off of whirlpool by control by the vibration of structure, thus make whirlpool come off and the vibration of pipeline has identical frequency, there is " locking " (lock-in) phenomenon.
Especially; in the marine petroleum exploitation of today; for the consideration of economy and flexibility; frequent meeting platform connects multiple pipeline; such as compact arranged top tension-type vertical pipe, under the effect of ocean current, the vortex-induced vibration of generation; and the wake interference of side standpipe, have a huge impact to the motion of standpipe.Relative to the vortex-induced vibration of single standpipe, the wake interference between many standpipes makes riser vortex excited vibration become more complicated and changeable, the vortex-induced vibration under the wake interference of this complexity, easily the fatigue failure of aggravation standpipe.For reducing vortex-induced vibration to the infringement of standpipe, it is necessary for studying vortex-induced vibration and finding out effective braking measure.
The method of cylinder vortex-induced vibration is suppressed to be divided into two classes: ACTIVE CONTROL and Passive Control measure.According to the mechanism of Passive Control measure, passive control methods is divided into 3 classes:
(1) protrusion of surface, affects defiber or unmixing base, as screw thread, lines, fin, bolt and hemisphere face etc.;
(2) wrap, impact entrainments layer, as perforation, silk screen, control lever and axial lath etc.;
(3) near wakes stabilizer, stops the interaction of entrainmenting layer, as ribbon, radome fairing, demarcation strip, guide vane, end row and slit etc.
Particularly, the domestic and international research of the vibration-repressing device to vortex-induced vibration of marine riser is mainly for single standpipe at present, and does not consider the wake interference effect between standpipe group, and in fact the interference of wake flow makes vortex-induced vibration become more complicated.Invented a lot of vortex-induced vibration suppression device in the past, but these restraining devices are not necessarily suitable for when wake interference, but also are likely harmful to.
Summary of the invention
The object of this invention is to provide a kind of vortex-induced vibration of marine riser restraining device, it is not only applicable to single standpipe, is applicable to standpipe group yet, especially can effectively suppress riser vortex excited vibration when wake interference yet; Further, this restraining device manufacture is simple, easy for installation.
For achieving the above object, the present invention carrys out specific implementation by the following technical programs:
A kind of vortex-induced vibration of marine riser restraining device, comprises V-arrangement front console and V-arrangement rear end panel, and described V-arrangement front console is arranged on to the one side that ocean current flows to above marine riser, and described V-arrangement rear end panel is arranged on marine riser back to the one side that ocean current flows to; The cross section of described V-arrangement front console and described V-arrangement rear end panel is all V-shaped, and respectively with the plane tangent of described marine riser.
Preferably, the external surface on the V-arrangement top of described V-arrangement front console comprises at least one arcuate structure, the circle centre position of arcuate structure is provided with the rotating shaft of horizontally set, and V-wing plate is installed in rotating shaft, the interior angle of described V-wing plate coordinates with described arcuate structure, and described V-wing plate can be rotated around the axis.
Preferably, the sector region of V-wing plate in horizontal direction ± 15 of arcuate structure ° is arranged to take rotating shaft as the revolving body in axle center; Preferably, between the surface of the V-wing plate on the direction on rear side of described rotating shaft and described V-arrangement front console, inclination angle is set, is beneficial to the rotation of V-wing plate; More preferably, the V-arrangement top undulate of described V-arrangement rear end panel, and corrugated trough is corresponding with the arcuate structure of described V-arrangement front console.
Preferably, the external surface of two panels of described V-arrangement rear end panel is sinusoidal wave shape, and the crest of two panels is relative with crest, trough is relative with trough, make the JiVXing top, intersection of two panels of described V-arrangement rear end panel form sine-shaped fluctuating, the surface of two panels of described V-arrangement rear end panel is smooth surface.
Preferably, the front end of described V-wing plate is circular arc, and back edge is linear; Preferably, the thickness of described V-wing plate increases to the inside gradually along edge.
Preferably, described V-wing plate is symmetrical structure, and namely described V-wing plate is symmetrically distributed in the both sides of described V-arrangement front console.
Preferably, described V-wing plate is projected as the fusiform airfoil of intermediate drum at described V-arrangement front console.
Preferably, the length of the V-wing plate on rear side of described rotating shaft is greater than the length of the V-wing plate on front side of described rotating shaft.
Preferably, the length of the V-wing plate on rear side of described rotating shaft is more than 2 times of the length of the V-wing plate on front side of described rotating shaft.
Preferably, the inclination angle between the surface of described V-wing plate and described V-arrangement front console is 3-5 °.
The invention has the beneficial effects as follows:
1, the V-wing plate installed on V-arrangement front console, can swing swing especially by a small margin along with current, while guiding incoming flow dispersion, can reduce the resistance of incoming flow to marine riser;
2, V-arrangement front console and V-arrangement rear end face plate combination is utilized, and the setting of V-wing plate, especially can reduce the impact of upstream standpipe wake flow;
3, shuttle type restraining device effectively suppresses vortex-induced vibration, and lift is reduced greatly, improves the fatigue life of standpipe;
4, this vortex-induced vibration suppression device structure is simple, can be convenient to processing and install by blocking.
The wing plate that the present invention utilizes dipping and heaving in wave shape, can form different fluid passage, upsets axial marine riser surface flow field; Standpipe surfactant fluid defiber or unmixing base is affected in conjunction with shuttle resemblance.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is schematic front view of the present invention;
Fig. 2 is that schematic diagram is looked on a left side of the present invention;
Fig. 3 is schematic top plan view of the present invention;
Fig. 4 is lift coefficient collection of illustrative plates before installation restraining device;
Fig. 5 is lift coefficient collection of illustrative plates after installation restraining device;
Fig. 6 be install vortex-induced vibration suppression device downstream marine riser around flow field velocity polar plot;
Fig. 7 is the schematic cross-section of V-arrangement rear end panel;
Fig. 8 is that schematic top plan view is arranged in the flow field before not installing V-wing plate, and wherein arrow represents to come flow path direction.
In figure: 1, marine riser; 2, V-arrangement front console; 21, arcuate structure; 22, rotating shaft; 23, V-wing plate; 29, inclination angle; 3, V-arrangement rear end panel; 4, downstream marine riser.
Detailed description of the invention
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Below in conjunction with accompanying drawing, a preferred embodiment of the present invention is described.
As shown in Figure 1-Figure 3, in the present embodiment, a kind of vortex-induced vibration of marine riser restraining device, be arranged on marine riser 1, comprise V-arrangement front console 2 and V-arrangement rear end panel 3, described V-arrangement front console 2 is arranged on marine riser 1 above to the one side that ocean current flows to, and described V-arrangement rear end panel 3 is arranged on marine riser 1 back to the one side that ocean current flows to; The cross section of described V-arrangement front console 2 and described V-arrangement rear end panel 3 is all V-shaped, and respectively with the plane tangent of described marine riser 1.
Preferably, V-arrangement front console 2 and described V-arrangement rear end panel 3 symmetrical shape.
Preferably, the external surface on the V-arrangement top of described V-arrangement front console 2 has at least one arcuate structure 21, is preferably multiple continuous print arcuate structure 21.The circle centre position of arcuate structure 21 is provided with the rotating shaft 22 of horizontally set, and in rotating shaft, be provided with V-wing plate 23, and the interior angle of described V-wing plate 23 coordinates with described arcuate structure, makes V-wing plate 23 rotating shaft to be axis rotation.
Preferably, the V-arrangement top of described V-arrangement rear end panel 3 and shuttle tail undulate, and corrugated trough is corresponding with the arcuate structure of described V-arrangement front console 2, namely the center of the trough place on the V-arrangement top of each V-arrangement rear end panel 3 and an arcuate structure of described V-arrangement front console 2 is in same level, so just make, in fluid through the V-arrangement front console process in advanced downstream, to reduce the generation of turbulent flow.
Preferably, V-wing plate 23 can 22 do and rotates by a small margin around the shaft; More preferably, V-wing plate 23 is arranged in the revolving body that the sector region of horizontal direction ± 15 ° of arcuate structure 21 take rotating shaft as axle center.
More preferably, in 3-5 ° of inclination angle 29 between the surface of the V-wing plate 23 on the direction on rear side of described rotating shaft 22 and described V-arrangement front console 2, make described V-wing plate 23 in the process of deflection, its afterbody can not collide with V-arrangement front console 2.
Further preferably, as shown in Figure 7, the inner surface of two panels of described V-arrangement rear end panel 3 is plane, external surface is sinusoidal wave shape, panel outer surface is the wavestrip risen and fallen, axial undulate, and the crest of two panels is relative with crest, trough is relative with trough, makes the JiVXing top, intersection of two panels of described V-arrangement rear end panel form sine-shaped fluctuating; Preferably, the surface of two panels of described V-arrangement rear end panel is smooth surface, adopts smooth surface to be conducive to reducing the generation of turbulent flow, and then can suppress vortex-induced vibration.
Preferably, the width of wavestrip is panel width 0.7D, and wavelength is 3D, and wave height is 0.1D, trough place thickness of slab 0.06D.
Preferably, for reducing the generation of turbulent flow better, reduce water impact, the front end of described V-wing plate 23 is circular arc, and back edge is linear, and the thickness of described V-wing plate 23 increases to the inside gradually along edge.Utilize the arc-shaped structure of V-wing plate 23 front end, what V-wing plate 23 can be made to bear multiple angle carrys out flow path direction, not only comprises the incoming flow in front, also comprises the incoming flow of prism, can carry out drainage dredge by V-wing plate 23; And rear end adopts rectilinear structure, make V-wing plate 23 reduce the effect of the interference to incoming flow, reduce the resistance of V-wing plate 23 convection cell; The design that the thickness of described V-wing plate 23 increases to the inside gradually along edge, then can make it closer to wing shapes, and fluid, when V-wing plate 23, ensures the stability of V-wing plate 23.
Described V-wing plate 23 is symmetrical structure, i.e. the both sides being distributed in described V-arrangement front console of described V-wing plate 23 symmetry; Simultaneously, arrange because V-wing plate 23 is vertical with marine riser 1, marine riser is vertically installed, V-wing plate 23 horizontal arrangement, the fluid through V-wing plate 23 can be ensured like this, be split into upper and lower two parts, the flow direction of every part formation oneself, forms the consistent laminar flow in a direction between neighbouring two V-wing plates 23, when fluid is through multiple V-wing plate 23, cut into several laminar flows by V-wing plate, decrease the generation of turbulent flow, effectively can suppress vortex-induced vibration.
Preferably, described V-wing plate 23 is projected as airfoil (see Fig. 2 signal) at described V-arrangement front console, and such fluid, when V-wing plate 23, ensures that the stability of V-wing plate 23 reaches optimum efficiency.
Preferably, the length of the V-wing plate 23 of length on front side of described rotating shaft 22 of the V-wing plate 23 on rear side of described rotating shaft 22, is conducive to like this making V-wing plate 23 carry out the fluctuation of minute angle along with current, makes the guiding of V-wing plate 23 more flexible.
More preferably, the length of the V-wing plate 23 on rear side of described rotating shaft 22 is more than 2 times of the length of the V-wing plate 23 on front side of described rotating shaft 22, while the flexibility that can realize V-wing plate 23 the best is set like this, make the topology layout of described V-wing plate 23 also more reasonable.
Preferably, V-arrangement front console 2 and V-arrangement rear end panel 3 are about standpipe axis symmetry.V-arrangement front console 2 and panel 3 front and back end, V-arrangement rear end angle are 60 °, and panel length is D.Panel and standpipe contact point in the standpipe left and right sides 60 ° locate.Preferably, V-arrangement front console 2 is connected by stator with V-arrangement rear end panel 3.
Preferably, flow field adopts many standpipe arranged in series, and downstream standpipe is in standpipe wake zone, upstream.Apparatus of the present invention are installed on the standpipe of downstream along downbeam.
Preferably, front end is 8D (D is the diameter of standpipe) far from upstream standpipe, and rear end is 24D far from downstream standpipe, and left and right margins standpipe is 8D, and whole flow field height is 10D; Calculate wake zone with LES turbulence model and standpipe lift coefficient figure before and after shuttle type (without V-wing plate, V-arrangement rear end panel is dull and stereotyped) restraining device is installed.Fig. 4 is lift coefficient collection of illustrative plates before installation restraining device; Fig. 5 is lift coefficient collection of illustrative plates after installation restraining device; Wherein, longitudinal axis CI represents lift coefficient, and transverse axis represents flowing time, is lift coefficient convergence record.Can obviously be found out by Fig. 4, Fig. 5, owing to being no longer single-frequency vibration but multiple low-frequency oscillation by the change of standpipe wake radiation downstream, upstream standpipe lift coefficient, consistent with based on LES method Three dimensional transient peripheral flow numerical simulation conclusion.This shuttle type restraining device effectively suppresses vortex-induced vibration, lift is reduced greatly, improves the fatigue life of standpipe.
Fig. 6 be vortex-induced vibration suppression device is installed downstream standpipe around flow field velocity polar plot, find out that speed whirlpool central point is formed in shuttle type restraining device caudal horn away from standpipe surface from figure, suppress the oscillation crosswise of lateral force and standpipe.
Preferably, if submerged riser draw ratio is very large, every one section, above-mentioned vortex-induced vibration suppression device can be installed thereon, every section of desirable 6D of described restraining device length.
The invention has the beneficial effects as follows: the V-wing plate installed on V-arrangement front console, swing by a small margin can be especially done along with current shifting, while guiding incoming flow dispersion, the resistance of incoming flow to marine riser can be reduced, effective suppression vortex-induced vibration makes lift greatly reduce, and improves the fatigue life of standpipe; Utilize V-arrangement front console and V-arrangement rear end face plate combination, in conjunction with the setting of V-wing plate, especially can reduce the impact of upstream standpipe wake flow; This vortex-induced vibration suppression device structure is simple, can be convenient to processing and install by blocking.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. a vortex-induced vibration of marine riser restraining device, comprise V-arrangement front console and V-arrangement rear end panel, it is characterized in that, described V-arrangement front console is arranged on to the one side that ocean current flows to above marine riser, and described V-arrangement rear end panel is arranged on marine riser back to the one side that ocean current flows to; The cross section of described V-arrangement front console and described V-arrangement rear end panel is all V-shaped, and respectively with the plane tangent of described marine riser; The external surface on the V-arrangement top of described V-arrangement front console comprises at least one arcuate structure, the circle centre position of arcuate structure is provided with the rotating shaft of horizontally set, and V-wing plate is installed in rotating shaft, the interior angle of described V-wing plate coordinates with described arcuate structure, makes described V-wing plate rotatable around the shaft.
2. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 1, is characterized in that, the sector region of V-wing plate in horizontal direction ± 15 of arcuate structure ° is arranged to take rotating shaft as the revolving body in axle center.
3. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 1 or 2, is characterized in that, arranges inclination angle, be beneficial to the rotation of V-wing plate between the surface of the V-wing plate on the direction on rear side of described rotating shaft and described V-arrangement front console.
4. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 3, is characterized in that, the inclination angle between the surface of described V-wing plate and described V-arrangement front console is 3-5 °.
5. a kind of vortex-induced vibration of marine riser restraining device as described in claim 1 or 2 or 4, is characterized in that: the V-arrangement top undulate of described V-arrangement rear end panel, and corrugated trough is corresponding with the arcuate structure of described V-arrangement front console.
6. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 5, it is characterized in that, the external surface of two panels of described V-arrangement rear end panel is sinusoidal wave shape, and the crest of two panels is relative with crest, trough is relative with trough, make the JiVXing top, intersection of two panels of described V-arrangement rear end panel form sine-shaped fluctuating, the surface of two panels of described V-arrangement rear end panel is smooth surface.
7. a kind of vortex-induced vibration of marine riser restraining device as described in claim 1,2,4 or 6, is characterized in that, the front end of described V-wing plate is circular arc, and back edge is linear.
8. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 5, is characterized in that, the front end of described V-wing plate is circular arc, and back edge is linear.
9. a kind of vortex-induced vibration of marine riser restraining device as claimed in claim 7, is characterized in that, the thickness of described V-wing plate increases to the inside gradually along edge.
10. a kind of vortex-induced vibration of marine riser restraining device as described in claim 1,2,4,6,8 or 9, it is characterized in that, described V-wing plate is symmetrical structure, namely described V-wing plate is symmetrically distributed in the both sides of described V-arrangement front console.
11. a kind of vortex-induced vibration of marine riser restraining devices as described in claim 1,2,4,6,8 or 9, is characterized in that, described V-wing plate is projected as the fusiform airfoil of intermediate drum at described V-arrangement front console.
12. a kind of vortex-induced vibration of marine riser restraining devices as claimed in claim 10, is characterized in that, described V-wing plate is projected as the fusiform airfoil of intermediate drum at described V-arrangement front console.
13. a kind of vortex-induced vibration of marine riser restraining devices as described in claim 1,2,4,6,8,9 or 12, it is characterized in that, the length of the V-wing plate on rear side of described rotating shaft is greater than the length of the V-wing plate on front side of described rotating shaft.
14. a kind of vortex-induced vibration of marine riser restraining devices as claimed in claim 13, is characterized in that, the length of the V-wing plate on rear side of described rotating shaft is more than 2 times of the length of the V-wing plate on front side of described rotating shaft.
15. a kind of vortex-induced vibration of marine riser restraining devices as claimed in claim 5, is characterized in that, the length of the V-wing plate on rear side of described rotating shaft is more than 2 times of the length of the V-wing plate on front side of described rotating shaft.
16. a kind of vortex-induced vibration of marine riser restraining devices as claimed in claim 7, is characterized in that, the length of the V-wing plate on rear side of described rotating shaft is more than 2 times of the length of the V-wing plate on front side of described rotating shaft.
17. a kind of vortex-induced vibration of marine riser restraining devices as claimed in claim 10, is characterized in that, the length of the V-wing plate on rear side of described rotating shaft is more than 2 times of the length of the V-wing plate on front side of described rotating shaft.
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| CN108548583A (en) * | 2018-04-08 | 2018-09-18 | 芜湖致新信息科技有限公司 | A kind of Level monitor of hydraulic engineering |
| CN116856861B (en) * | 2023-09-05 | 2023-11-17 | 浙江华东岩土勘察设计研究院有限公司 | Protective sleeve construction equipment |
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| CN102071883A (en) * | 2010-12-03 | 2011-05-25 | 上海交通大学 | Underwater stand pipe vortex induced vibration inhibiter adopting rotatable cowling |
| CN102865044A (en) * | 2012-10-11 | 2013-01-09 | 江苏科技大学 | Imitated aerofoil adaptive vortex-induced vibration suppression and resistance reduction device for underwater riser |
| KR20140065849A (en) * | 2012-11-22 | 2014-05-30 | 삼성중공업 주식회사 | Riser pipe |
| CN103306613A (en) * | 2013-06-25 | 2013-09-18 | 西南石油大学 | Vortex-induced vibration inhibition device for marine riser of adjustable and rotatable separating disk |
| CN203515367U (en) * | 2013-10-23 | 2014-04-02 | 西南石油大学 | Rotatable shuttle fairing type marine riser vortex-induced vibration suppression device |
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| CN104790881A (en) | 2015-07-22 |
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