CN108194035A - A kind of vortex-induced vibration of marine riser restraining device and suppressing method - Google Patents
A kind of vortex-induced vibration of marine riser restraining device and suppressing method Download PDFInfo
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- CN108194035A CN108194035A CN201810100604.1A CN201810100604A CN108194035A CN 108194035 A CN108194035 A CN 108194035A CN 201810100604 A CN201810100604 A CN 201810100604A CN 108194035 A CN108194035 A CN 108194035A
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- induced vibration
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- 238000000034 method Methods 0.000 title claims description 9
- 230000001629 suppression Effects 0.000 claims abstract description 25
- 230000005764 inhibitory process Effects 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims description 13
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- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
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- 239000002131 composite material Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
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- 238000013461 design Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
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- 238000007667 floating Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/01—Risers
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of rear body arrangement rotary vortex-induced vibration suppression devices of empennage type, including the restraining device being set on standpipe and two rotary units, the restraining device both ends are respectively fixedly connected with a rotary unit, and the rotary unit is held on the standpipe.Apparatus of the present invention carry closed rotary unit, suitable for different current directions, while are avoided that the problems such as foreign matter enters and reduces rust corrosion.The rotary unit is designed for planetary gear type, and the design of planetary gear type is it is characterized in that rotary motion is steady, the ability of shock resistance and vibration is stronger.The hemispherical dimples being provided on the sleeve curved surface simultaneously, are verified through CFD, have better inhibition than the vortex-induced vibration suppression device of the prior art.
Description
Technical field
The invention belongs to vortex-induced vibration of marine riser suppression technology fields, are related to a kind of vortex-induced vibration suppression device, more
Body is to be related to a kind of vortex-induced vibration of marine riser restraining device.
Background technology
With the increasing of Marine oil and gas resource exploitation dynamics, deep water hydrocarbon exploitation has become future trend, and marine riser is
The composition component of marine oil and gas drilling is the important component of connected floating drilling platforms and subsea production system.It stands ocean
Underwater environment is severe residing for pipe, and stress is complicated.When wave current flows through standpipe, can be generated in marine riser tail portion periodically alternately
The whirlpool to come off, coming off for whirlpool change the stress distribution on standpipe surface, cause periodic vortex-induced vibration, standpipe is caused
Very big destruction.Vortex-induced vibration of marine riser is reduced to have a very important significance marine petroleum exploitation.
Existing vortex-induced vibration device there are it is following the shortcomings that：
1st, the existing apparatus announced belongs to the Theoretical Design in structure mostly, and effect does not obtain CFD numerical simulations and tests
Card does not obtain meeting practical ocean environment parameter (such as：Different Reynolds number range, difference carry out flow angle) fact test
Card.
What the 2nd, existing apparatus considered is typically all that flow field near standpipe is interfered, and is allowed to destroy, postpone the formation in whirlpool
With development, research and utilization is not subject to the boundary layer fluid of standpipe or standpipe upper bush, is obtained because boundary layer wants weak compared to vortex
It is more, pass through the formation for extending shear layer, postponing whirlpool, it is possible to reduce the lateral stressed disturbance of standpipe.
Patent No. US6685394B1, entitled " inhibition and application method of the chadless coaming plate to vortex-induced vibration
(Partial shroud with perforating for VIV suppression and method of using's) "
The shortcomings that patent, disclosed vortex-induced vibration suppression device is not account for the stabilization of wake flow to the inhibition of vortex-induced vibration；The patent No.
For US9534618B1, entitled " pant device (the Faring bodies with multiple with multiple components
Parts the shortcomings that patent) ", disclosed vortex-induced vibration suppression device is the interference not accounted for incoming, can not be according to not
It is rotated with direction of flow.
Invention content
The purpose of the invention is to overcome the problems, such as of the existing technology and defect, mainly for asking for vortex-induced vibration
Topic, realizes the inhibition of different direction of flow vortex-induced vibrations, reduces the fatigue damage to standpipe, and providing a kind of dismantled and assembled, performance can
The rear body arrangement rotary vortex-induced vibration of marine riser restraining device of empennage type leaned on.
In order to achieve the above objectives, the present invention is realised by adopting the following technical scheme：
The body arrangement rotary vortex-induced vibration suppression device of empennage type after a kind of, one including being set on standpipe 1 inhibits dress
2, two rotary units 3 are put, 2 both ends of restraining device are respectively fixedly connected with a rotary unit 3, and rotary unit 3 is held on standpipe 1
On.
Further, the restraining device 2, by body empennage 2-3 structures after sleeve 2-1, at least two connector 2-2 and one
Into.Wherein described sleeve 2-1 is round tube shape structure, and connector 2-2 is column.The disconnected section of body empennage 2-3 is in " V " word afterwards
Shape, positioned at the symmetrical distribution in downstream of 1 direction of flow of standpipe, " V " font is open towards downstream.Connector 2-2 is located at sleeve
Between 2-1 and rear body empennage 2-3, one end is fixedly connected with sleeve 2-1, and the other end is fixedly connected with rear body empennage 2-3.
Further, the rotary unit 3 is planetary gear type structure, including centre wheel 3-2, at least four planetary gear 3-
3rd, outer ring 3-4, two pieces of semicircular ring cover board 3-1 and bottom plate 3-2-2.Centre wheel 3-2, planetary gear 3-3, outer ring 3-4 according in compliance to
It is outer to be meshed connection in " interior, in, outer " distribution and the gear teeth by being each provided with.Simultaneously circle is designed in 3 bottom of rotary unit
The bottom plate 3-2-2 of annular, bottom plate 3-2-2 are fixedly connected with centre wheel 3-2, the cover board 3-1 mirror images pairing installation of two pieces of semicircular rings
It is fixedly connected on 3 top of rotary unit with centre wheel 3-2.So that rotary unit 3 forms closed structure.Rotary unit 3 presss from both sides
It is held on standpipe 1.Make to be fixed by bolts to sleeve 2-1 both ends, the spiral shell of junction also through the outer ring 3-4 of rotary unit 3 simultaneously
Bolt quantity is at least 8, and two pieces of semicircular ring cover board 3-1 are fixed to each other by least four bolt.All bolted numbers can
To determine as the case may be.
Further, the outer diameter of the bottom plate 3-2-2 and semicircular ring cover board 3-1 are the 0.9~0.95 of outer ring 3-4 outer diameters
Times.The internal diameter of semicircular ring cover board 3-1 is taken as 0.95~0.99 times of sleeve outer diameter.It can be fixedly clamped on standpipe 1, avoid
It slides and rotates.The outer surface of bottom plate 3-2-2 and semicircular ring cover board 3-1 are flushed with outer ring 3-4 upper and lower end faces.
Further, two planes are designed with seal groove 3-4-4 to the gear teeth 3-4-1 of the outer ring 3-4 up and down, and two and half
Also there is seal groove 3-1-3 between annulus cover board 3-1.Installation is complete, and backgear is in confined space, avoids foreign matter in seawater
Into cause rotary unit 3 fail and reduce 3 meshing gear of rotary unit rust corrosion the problems such as.
Further, several hemispherical dimples 2-1-2, hemispherical dimples 2- are provided on the sleeve 2-1 appearance curved surfaces
The arrangement mode of 1-2 is arranged for matrix form or isosceles triangle, is calculated through CFD, the 1/20 of a diameter of sleeve 2-1 outer diameters of hemispherical dimples
~1/10.Distance is taken as 1~2 times of sphere diameter between two hemispherical dimples 2-1-2.Hemispherical dimples 2-1-2 areas account for sleeve
The 8% to 20% of 2-1 appearance surface areas.Sleeve 2-1 both ends of the surface are designed with the screw hole being connect with rotary unit 3, each end face
The quantity of screw hole is at least 8.The wall thickness of sleeve 2-1 is identical with hemispherical dimples diameter.
Further, the connector 2-2 length is the 1/3~1/2 of sleeve 2-1 outer diameters.Distribution mode is：In sleeve song
Face is by equidistantly distributed between distribution one connector 2-2, connector 2-2 each at two close end.The surface of connector 2-2 is smooth
Surface or at least four fair current to diversion trench, diversion trench equidistantly distributed.The disconnected section of connector 2-2 is following several shapes
Any one of formula：
A. disconnected section is rectangle, and long side is taken as 4~6 times of hemispherical dimples 2-1-2 diameters, and short side is taken as hemispherical dimples
2~4 times of 2-1-2 diameters, short side is in the horizontal direction；
B. disconnected section is square, and the length of side is taken as 2~6 times of hemispherical dimples 2-1-2 diameters；
C. disconnected section is ellipse, and long axis takes 4~6 times of hemispherical dimples 2-1-2 diameters, and short axle takes hemispherical dimples 2-
2~4 times of 1-2 diameters, short axle is in the horizontal direction；
D. disconnected section is circle, and diameter takes 2~6 times of hemispherical dimples 2-1-2 diameters.
Further, the rear body empennage 2-3 length is identical with sleeve 2-1, and the angle α of " V " font is 80 °~100 °,
The each edge length of " V " font is 0.65~0.75 times of sleeve 2-1 outer diameters.The wall thickness of body empennage 2-3 and sleeve wall thickness phase afterwards
Together, rear body empennage 2-3 is equipped with through-hole 2- that is several vertical with the wall surface of rear body empennage 2-3 and being arranged in matrix form or isosceles triangle
The cross sectional shape of 3-1, through-hole 2-3-1 are any one of following several forms：
A. round, the diameter of through-hole 2-3-1 is identical with the diameter of sleeve 2-1 surfaces hemispherical dimples 2-1-2；
B. oval, long axis takes 1~2 times of hemispherical dimples 2-1-2 diameters, and short axle takes hemispherical dimples 2-1-2 diameters
0.5~1 times；
C. rectangle, length are taken as 1~2 times of hemispherical dimples 2-1-2 diameters, and width is taken as hemispherical dimples 2-1-2
0.5~1 times of diameter；
D. regular polygon, circumscribed circle diameter are taken as 0.5~1.5 times of hemispherical dimples 2-1-2 diameters.
Need to meet in the material selection of restraining device 2 and rotary unit 3 light weight, preferable mechanical strength, it is corrosion-resistant plus
Work such as facilitates at the requirements.It is to manufacture the material solution that apparatus of the present invention are chosen below：
A. steel are chosen, the surface of restraining device 2 and rotary unit 3 can plate one layer of crome metal, and reduction is got rusty.Wherein revolve
Turn 3 inside of unit and stainless steel material can be selected；
B. aluminum alloy materials are chosen, the advantage is that material is relatively light, intensity is high, corrosion-resistant, easy processing；
C. polyurethane material is chosen, the advantage is that service life is long with higher mechanical strength and oxidation stability,
Temperature tolerance is at subzero 20 ° to 120 ° of high temperature, non-toxic and tasteless, environment friendly and pollution-free, the light-weight reduction load of polyurethane products；
D. carbon fibre composite is chosen, the advantage is that light-weight, intensity is high.Compared to steel, in same strength
Under, weight only has the 1/5 of steel.
The operation principle and suppressing method of a kind of rear body arrangement rotary vortex-induced vibration suppression device of empennage type of the present invention,
Detailed process is as follows：
When ocean current flows through standpipe 1, the whirlpool periodically alternately to come off can be generated in marine riser tail portion, whirlpool takes off
The stress distribution for changing 1 surface of standpipe is fallen, causes periodic vortex-induced vibration, very big destruction is caused to standpipe.
When frequency and the frequency of standpipe inherently of vortex shedding are close, " locking " phenomenon can be formed, the vibration that standpipe can be violent,
Serious fatigue damage is caused to standpipe.Therefore vortex-induced vibration suppression device is installed on standpipe very necessary.Apparatus of the present invention
It is found by CFD result of calculations, the 1/20~1/10 of a diameter of sleeve 2-1 outer diameters of surface hemispherical, and body empennage after installation
Designing scheme greatly reduces the intensity of vorticity, reduces the amplitude of vortex-induced vibration.
Using positive direction of the x-axis in rectangular coordinate system as 0 ° of direction.When direction of flow is 0 ° of direction, rear body empennage 2-3 passes through
Rotary unit 3 is turned at 180 ° of direction of flow downstream.When direction of flow changes, and direction of flow is 30 ° or 90 °, standpipe 1
Surrounding fluid field pressure changes, and rear body empennage 2-3 is turned to by rotary unit 3 at 210 ° or 270 ° of direction of flow downstream.Suppression
The rotation of device processed changes as the wind vane known to us with the variation of flow direction, and rear body empennage 2-3 is always
Downstream in direction of flow.
When incoming flows through sleeve 2-1, due to being distributed with hemispherical dimples 2-1-2 on sleeve 2-1, around sleeve 2-1
Flow field is disturbed, reduces the energy to form whirlpool.It verifies through CFD, is filled relative to the inhibition for other similar types announced
It puts, the effect of the design reduction standpipe oscillation crosswise of sleeve 2-1 surfaces hemispherical dimples 2-1-2 can reach more than 20%.
Due to body empennage 2-3 after increase, solves the shakiness that the change dramatically of wake flow speed in existing restraining device is brought
The shortcomings that qualitative.When incoming shear layer leaves the edge of sleeve 2-1, along the fair current on connector 2-2 surfaces to diversion trench weight
The surface of rear body empennage 2-3 is newly attached to, since the fluctuation of shear layer is relatively small, and energy is weaker.Therefore, it is cut by extension
Layer is cut, delays the formation of whirlpool, the fluctuation of near wakes area pressure can be reduced.
When incoming shear layer is attached on rear body empennage 2-3 surfaces, both sides form closed loop, this symmetrical circulation
It prevents and forms alternate Karman vortex street from one side to another side near wakes region；In turn, it stabilizes near wakes area,
Delay the formation of Karman vortex street；Since the circulation in lateral barometric gradient is symmetrical, there is a kind of power and eliminate effect,
Near wakes area surge pressure gradient reduces, and delays the formation of whirlpool, neighbouring wake zone is stabilized, so as to reduce vibration
Amplitude；Through-hole 2-3-1 after simultaneously on body empennage 2-3 reduces fair current to be increased to resistance so that near wakes areal pressure gradient
Reduce, realize the inhibition of vortex-induced vibration.
Compared with prior art, the present invention has the following advantages and beneficial effect：
1st, apparatus of the present invention carry closed rotary unit, suitable for different current directions, while are avoided that foreign matter enters
And the problems such as reducing rust corrosion.The rotary unit is designed for planetary gear type, and the design of planetary gear type is it is characterized in that rotation
It is stronger to turn stable movement, shock resistance and the ability of vibration.
2nd, the design of apparatus of the present invention sleeve appearance curved surface hemispherical dimples, is verified through CFD, is pressed down than previous vortex-induced vibration
Device processed has better effect.
As shown in figure 12, for the device when withouyt rear body empennage, sleeve surface is designed with 3 kinds of various sizes of hemisphericals
Pit.By observing stress curve, the designing scheme ratio sphere diameter of a diameter of sleeve outer diameter 1/20 and 1/10 of hemispherical is outside sleeve
The scheme of diameter 1/5 optimizes significantly, and the scheme optimization of a diameter of sleeve outer diameter 1/20 of hemispherical the inhibition of vortex-induced vibration
Effect is best.The optimal scheme sleeve smooth with surface and surface are compared for the sleeve of rectangular pit：
As shown in figure 13, the smooth sleeve design scheme in surface, average force ranging from -0.01942N to 0.0165N, table
Designing scheme of the face for rectangular pit, average force ranging from -0.015222N to 0.01466N, a diameter of set of surface hemispherical
The designing scheme of cylinder outer diameter 1/20, average force ranging from -0.01175N to 0.01198N.
Smooth sleeve is compared with surface, and the designing scheme of a diameter of sleeve outer diameter 1/20 of surface hemispherical swashs whirlpool
The inhibition of vibration optimizes 33.94%.It is compared with surface for rectangular pit sleeve, a diameter of set of surface hemispherical
The designing scheme of cylinder outer diameter 1/20 optimizes 20.58% to the inhibition of vortex-induced vibration.It is found by CFD result of calculations, table
Hemispherical a diameter of 1/20 designing scheme of sleeve outer diameter in face reduces the intensity of vorticity.
3rd, body empennage after apparatus of the present invention installation one.Under such arrangement, standpipe lateral amplitude of vibration, vortex-induced vibration are reduced
It must inhibit.
As shown in figure 14, the radome fairing restraining device designing scheme with flow distribution plate, average force ranging from -0.003124N
To 0.003134N, the designing scheme of body empennage, average force range after a diameter of sleeve outer diameter 1/20 of surface hemispherical and installation
For -0.000955N to 0.001069N.
After installation after body empennage, compared with the radome fairing restraining device with flow distribution plate.Surface hemispherical is a diameter of
The designing scheme of body empennage optimizes 67.66% to the inhibition of vortex-induced vibration after sleeve outer diameter 1/20 and installation.With surface
Smooth sleeve design scheme is compared, the design side of body empennage after a diameter of sleeve outer diameter 1/20 of surface hemispherical and installation
Case optimizes 94.37% to the inhibition of vortex-induced vibration.
Description of the drawings
Fig. 1 is standpipe, restraining device, rotary unit the assembling constitutional diagram of the present invention；
Fig. 2 is the isometric side view of the restraining device of the present invention；
Fig. 3 is the drawing in side sectional elevation of the restraining device of the present invention；
Fig. 4 is the side view of the restraining device of the present invention；
The rotary unit that Fig. 5 is the present invention is fixedly connected with schematic diagram with standpipe (part), restraining device (part)；
Fig. 6 is schematic diagram when rotary unit of the invention only adds a cover board；
Fig. 7 is the rotary unit internal structure schematic diagram of the present invention；
Fig. 8 is the outer ring part drawing of the rotary unit of the present invention；
Fig. 9 is the coverplate parts figure of the rotary unit of the present invention；
Figure 10 is the centre wheel part drawing of the rotary unit of the present invention；
Figure 11 is the planetary gear part drawing of the rotary unit of the present invention；
Figure 12 is the CFD proof schemes of the present invention：The a diameter of sleeve outer diameter of surface hemispherical 1/20,1/10,1/5 when
Curve graph is gone through during Forces Acting on Cylinder；
Figure 13 is the CFD proof schemes of the present invention：Surface is smooth, the rectangular pit of surface band, a diameter of set of surface hemispherical
Curve graph is gone through during 1/20 Forces Acting on Cylinder of cylinder outer diameter；
Figure 14 is the CFD proof schemes of the present invention：With splitter plate type radome fairing, surface hemispherical a diameter of sleeve outer diameter
1/20 and install additional after body empennage restraining device stress when go through curve graph；
Reference sign in figure：
1. standpipe；
2. restraining device；2-1. sleeve；2-1-1. screw hole；2-1-2. hemispherical dimples；2-2. connector；Body tail after 2-3.
The wing；2-3-1. through-hole；
3. rotary unit；3-1. semicircular ring cover boards；3-1-1. screw hole；3-1-2. fixing threaded hole；3-1-3. seal groove；3-2.
Centre wheel；3-2-1. the gear teeth；3-2-2. bottom plate；3-2-3. seal groove；3-2-4. screw hole；3-3. planetary gear；3-3-1. the gear teeth；
3-4. outer ring；3-4-1. the gear teeth；3-4-2. counterbore；3-4-3. screw hole；3-4-4. seal groove.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is described in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention,
It is not intended to limit the present invention.
The present invention it is a kind of after the body arrangement rotary vortex-induced vibration suppression device of empennage type, as shown in Figure 1, Figure 2, Fig. 3, Fig. 4 institute
Show, the sleeve 2-1 of restraining device 2 is set on standpipe 1, sleeve 2-1 both ends respectively one rotary unit 3 of installation, and being led to using bolt
It crosses screw hole 2-1-1 and connect fixation with the outer ring screw hole 3-4-3 of rotary unit 3.Sleeve 2-1 curved surfaces both ends are in each rigidity of same direction
A connector 2-2 is connected, two connector 2-2 other ends are rigidly connected again with rear body empennage 2-3.
As shown in Fig. 1, Fig. 5, Fig. 6, Fig. 8, outer ring 3-4 belongs to inside engaged gear, and outer ring upper surface is uniformly distributed at least 8
Screw hole 3-4-3, there is counterbore 3-4-2 thereon, and respectively there are a seal groove 3-4-4 in outer ring top and bottom, are placed in seal groove 3-4-4 resistance to
Grind ceramic seal circle, it is characterised in that wear-resisting, flexible, corrosion-resistant.Outer ring 3-4 uses bolt and sleeve by screw hole 3-4-3
2-1 connections are fixed.Outer ring 3-4 can be fastened between cover board 3-1 and bottom plate 3-2-2 after mounting.
As shown in Fig. 5, Fig. 8, Fig. 9, cover board 3-1 is held on standpipe 1 using bolt by fixing threaded hole 3-1-2, two
Shared at least ten screw hole 3-1-1, corresponding with screw hole 3-2-4 on centre wheel on block cover board 3-1, and makes to be joined with bolts.
There is seal groove 3-1-3 on two cover plates 3-1 contact surfaces, wear-resistant ceramic sealing ring is placed in seal groove 3-1-3.
As shown in Fig. 6, Fig. 7, Figure 10, Figure 11, centre wheel 3-2 is set on standpipe 1, and passes through at least ten screw hole 3-2-
4 connect fixation with cover board 3-1 using bolt.At least four planetary gear 3-3 is placed around centre wheel 3-2, is uniformly distributed in center
Take turns 3-2 surroundings.The gear teeth 3-3-1 of planetary gear 3-3 is engaged with the gear teeth 3-2-1 of the gear teeth 3-4-1 of outer ring 3-4, centre wheel 3-2,
Planetary gear train is formed, is the important component of rotary unit 3.
The present invention it is a kind of after body arrangement the rotary vortex-induced vibration suppression device of empennage type suppressing method be：
When current direction changes, 1 surrounding fluid field pressure of standpipe changes, and rear body empennage 2-3 is single by rotating
Member 3 turns to 1 rear portion of standpipe.Body empennage 2-3 can play the role of stable wake flow always afterwards.
A kind of rear body arrangement rotary vortex-induced vibration suppression device of empennage type of the present invention is different by CFD simplation verifications
Pit, inhibition are as follows：
Using restraining device neutral tube sleeve as research object, gap is ignored in the calculation between standpipe and sleeve, is stood
It is reduced to a cylinder in the calculation after pipe and sleeve combination.And to smooth cylindrical and surface band difference size, different form pit
Cylinder compared.This numerical simulation is using 2 dimension computation models.It is modeled using Solidworks, Hexpress griddings,
Fine/marine carries out numerical simulation calculation.Sleeve body diameter D takes 10mm, highly takes 5mm.
This calculating carries out in the flow field of Re=10000, and kinematic viscosity coefficient is taken as 1.18 × 10^ (- 6) m2/s
(15 DEG C of seawater), using unstable state, single-phase stream calculation, all around face is disposed as far field EXT to computational domain, and top and bottom are set as
MIR, time step 0.001s.
By Fine/Marine numerical simulation calculations, and pass through and monitor cylinder in lateral stressed size, with laterally upper stress
Size reflects the Vibration Condition of cylinder.The formation and development in whirlpool are monitored simultaneously, and standpipe stressing conditions are reflected by whirlpool.
This calculating will use comparison, improved mode, successive optimization design.Cutting diameter in Cylinder Surface is respectively
0.5mm (the 1/20 of sleeve outer diameter), 1mm (the 1/10 of sleeve outer diameter), 2mm (the 1/5 of sleeve outer diameter) hemispherical dimples, pit
Periphery is distributed in, best hemispherical diameter size is selected into this three kinds of situation comparisons.By the best of surface hemispherical dimples
Scheme carries out calculating knot with surface smooth cylindrical and surface for cylinder (patent US6685394B1) simplified model of rectangular pit
Fruit compares, and determines best design.
It was found that, hemispherical is a diameter of by going through curve during the Forces Acting on Cylinder of surface band difference hemispherical diameter in Figure 12
The scheme of the designing scheme sleeve outer diameter 1/5 more a diameter of than hemispherical of sleeve outer diameter 1/20 and 1/10 imitates the inhibition of vortex-induced vibration
Fruit is apparent, and the scheme optimization effect of a diameter of sleeve outer diameter 1/20 is best.
As shown in figure 13, the smooth cylinder design scheme in surface, average force ranging from -0.01942N to 0.0165N, table
The designing scheme of the rectangular pit in face, average force ranging from -0.015222N to 0.01466N, a diameter of sleeve of surface hemispherical
The designing scheme of outer diameter 1/20, average force ranging from -0.01175N to 0.01198N.
Smooth cylindrical sleeves are compared with surface, the designing scheme pair of a diameter of sleeve outer diameter 1/20 of surface hemispherical
The inhibition of vortex-induced vibration optimizes 33.94%.It is compared with surface for rectangular pit sleeve, surface hemispherical diameter
Designing scheme for sleeve outer diameter 1/20 optimizes 20.58% to the inhibition of vortex-induced vibration.It is sent out by CFD result of calculations
Existing, the designing scheme of a diameter of sleeve outer diameter 1/20 of surface hemispherical reduces the intensity of vorticity, plays preferable optimization effect
Fruit.
The cylindrical sleeves scheme with hemispherical dimples is optimized again later, body empennage after increasing by one, and shunted with band
The radome fairing restraining device of plate is compared, and determines final optimization pass scheme.
A kind of rear body arrangement rotary vortex-induced vibration suppression device of empennage type of the present invention is filled by comparing different inhibition
It puts, inhibition is as follows：
Using the restraining device of body empennage after installation as research object, wherein in model, grid generation and Fine/marine
Calculating parameter setting is identical with step 2.
As shown in figure 14, to be further improved the design of a diameter of sleeve outer diameter 1/20 of surface hemispherical, in rear cylindrical
Body tail gear after setting one at 0.5D (D is body diameter), for shear layer to be made to adhere to again, preferably stablizes wake flow, subtracts
Few influence of the trailing vortex to standpipe.The design simplifies mould with the radome fairing restraining device (patent US9534618B1) with flow distribution plate
Type carries out result of calculation comparison.
As shown in figure 14, the radome fairing restraining device with flow distribution plate, average force ranging from -0.003124N is extremely
The designing scheme of body empennage, average force range after 0.003134N, a diameter of sleeve outer diameter 1/20 of surface hemispherical and installation
For -0.000955N to 0.001069N.
After installation after body empennage, compared with the radome fairing restraining device with flow distribution plate, surface hemispherical is a diameter of
The designing scheme of body empennage optimizes 67.66% to the inhibition of vortex-induced vibration after sleeve outer diameter 1/20 and installation.With surface
Smooth cylindrical sleeves designing scheme is compared, and body empennage sets after a diameter of sleeve outer diameter 1/20 of surface hemispherical and installation
Meter scheme optimizes 94.37% to the inhibition of vortex-induced vibration.
Described in view of this, the design of body empennage, which has reached, after illustrating a diameter of sleeve outer diameter 1/20 of surface hemispherical and adding compares
The ideal effect for inhibiting vortex-induced vibration.The attachment again of shear layer is carried out it has been observed that after shear layer is attached to body surface
When on face, both sides form closed loop.Since the circulation in lateral barometric gradient is symmetrical, there is a kind of power and eliminate
Effect, so as to reduce the amplitude of vibration.Play the preferable effect for inhibiting vortex-induced vibration, reducing riser fatigue.
The above, only the specific embodiment of the present invention.Certainly, the present invention can also have other a variety of implementations
Example, without deviating from the spirit and substance of the present invention, any one skilled in the art, when can according to this
Various corresponding equivalent changes and deformation are made in invention, should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. the body arrangement rotary vortex-induced vibration suppression device of empennage type after a kind of, which is characterized in that including being set on standpipe (1)
A restraining device (2), two rotary units (3), restraining device (2) both ends are respectively fixedly connected with a rotary unit (3),
The rotary unit (3) is held on the standpipe (1).
2. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 1, which is characterized in that described
Restraining device (2) is made of sleeve (2-1), at least two connectors (2-2) and rear body empennage (2-3), the sleeve (2-1)
For round tube shape structure, connector (2-2) is column, and rear body empennage (2-3) is " V "-shaped for disconnected section, positioned at the standpipe
(1) the symmetrical distribution in the downstream of direction of flow, " V " font are open towards downstream；The connector (2-2) is positioned at sleeve (2-
1) between rear body empennage (2-3), one end is fixedly connected with the sleeve (2-1), the other end and the fixed company of rear body empennage (2-3)
It connects.
3. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 1, which is characterized in that described
Rotary unit (3) be planetary gear type structure, including centre wheel (3-2), at least four planetary gear (3-3), outer ring (3-4), two pieces
Semicircular ring cover board (3-1) and bottom plate (3-2-2), wherein the centre wheel (3-2), planetary gear (3-3) and outer ring (3-4) are according to compliance
In be meshed connection in " interior, in, outer " distribution and the gear teeth by being each provided with outward, the bottom plate (3-2-2) is mounted on rotation
Turn unit (3) bottom to be fixedly connected with centre wheel (3-2), two pieces of semicircular ring cover boards (3-1) mirror image pairing is mounted on rotation
Unit (3) top is fixedly connected with centre wheel (3-2), so as to form closed structure.
4. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 3, which is characterized in that described
The outer diameter of bottom plate (3-2-2) and semicircular ring cover board (3-1) is 0.9~0.95 times of outer ring (3-4) outer diameter；Semicircular ring cover board
The internal diameter of (3-1) is 0.95~0.99 times of sleeve (2-1) outer diameter.
5. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 3 or 4, which is characterized in that
Two planes are equipped with seal groove (3-4-4), the semicircular ring cover board (3-1) to the gear teeth (3-4-1) of the outer ring (3-4) up and down
End face is equipped with seal groove (3-1-3).
6. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 2, which is characterized in that described
Several hemispherical dimples (2-1-2), the arrangement of the hemispherical dimples (2-1-2) are provided on the appearance curved surface of sleeve (2-1)
Mode is arranged for matrix form or isosceles triangle, and the 1/20~1/10 of a diameter of sleeve of hemispherical dimples (2-1) outer diameter, two hemisphericals
Distance is taken as 1~2 times of sphere diameter between pit (2-1-2), and sleeve (2-1) both ends of the surface are equipped with and the rotary unit (3)
The screw hole of connection, the quantity of each end face screw hole are at least 8；The wall thickness of the sleeve (2-1) and hemispherical dimples diameter phase
Together.
7. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 2, which is characterized in that described
The length of connector (2-2) is the 1/3~1/2 of sleeve (2-1) outer diameter, and disconnected section is any in rectangular, oval, round
Kind, outer surface is equipped with fair current to diversion trench.
8. the body arrangement rotary vortex-induced vibration suppression device of empennage type after according to claim 2, which is characterized in that described
The length of body empennage (2-3) is identical with sleeve (2-1) afterwards, and the angle α of " V " font is 80 °~100 °, on rear body empennage (2-3)
Equipped with the through-hole (2-3-1) that several vertical and matrix forms with the wall surface of rear body empennage (2-3) or isosceles triangle arrange, through-hole (2-3-
1) cross sectional shape is round, oval, rectangular or regular polygon.
9. the rotary vortex-induced vibration suppression device of empennage type, feature are arranged according to body after claim 1-8 any one of them
It is, the material of the restraining device (2) and rotary unit (3) is the steel of plating metal on surface chromium, stainless steel, aluminium alloy, gathers
Any one of urethane and carbon fibre composite.
10. a kind of body arrangement rotary vortex-induced vibration suppression device of empennage type after 1-8 any one of them according to claim
Implementation method, which is characterized in that the specific implementation process is as follows：
When direction of flow is 0 ° of direction, rear body empennage (2-3) is turned to by rotary unit (3) at 180 ° of direction of flow downstream,
When direction of flow changes, at as 30 ° or 90 °, standpipe (1) surrounding fluid field pressure changes, and rear body empennage (2-3) is logical
It crosses rotary unit (3) to turn at 210 ° or 270 ° of direction of flow downstream, rear body empennage (2-3) is always under direction of flow
Trip；
When incoming flows through sleeve (2-1), since hemispherical dimples, the flow field of sleeve (2-1) surrounding being distributed on sleeve (2-1)
It is disturbed, reduce the energy to form whirlpool；
It is again attached to diversion trench along the fair current on connector (2-2) surface when incoming shear layer leaves the edge of sleeve (2-1)
The surface of rear body empennage (2-3), since the fluctuation of shear layer is relatively small, and energy is weaker, has delayed the formation of whirlpool,
Reduce the fluctuation of near wakes area pressure；
When incoming shear layer is attached on rear body empennage (2-3) surface, both sides form closed loop, this symmetrical ring flow resistance
Stop and formed alternate Karman vortex street from one side to another side near wakes region；In turn, it stabilizes near wakes area, prolongs
The late formation of Karman vortex street；Since the circulation in lateral barometric gradient is symmetrical, generates a kind of power and eliminate effect, nearly tail
It flows area's surge pressure gradient to reduce, delays the formation of whirlpool, neighbouring wake zone is stabilized, so as to reduce the width of vibration
Degree；Through-hole (2-3-1) after simultaneously on body empennage (2-3) reduces fair current to resistance so that near wakes areal pressure gradient subtracts
It is small, realize the inhibition of vortex-induced vibration.
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| CN110792398A (en) * | 2019-11-04 | 2020-02-14 | 河海大学 | Device for inhibiting vortex-induced vibration of marine riser |
| CN111306148A (en) * | 2020-03-09 | 2020-06-19 | 中国海洋石油集团有限公司 | Marine riser vortex-induced vibration suppression device |
| CN111613352A (en) * | 2020-06-04 | 2020-09-01 | 中国核动力研究设计院 | Vortex-induced vibration suppression device for cylindrical structure |
| CN111735502A (en) * | 2020-07-16 | 2020-10-02 | 扬州大学 | Vortex vibration variable flow protection device based on wind field monitoring |
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