CN113445934B - Device for restraining vortex-induced motion of ocean platform by utilizing wave force - Google Patents
Device for restraining vortex-induced motion of ocean platform by utilizing wave force Download PDFInfo
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- CN113445934B CN113445934B CN202110589813.9A CN202110589813A CN113445934B CN 113445934 B CN113445934 B CN 113445934B CN 202110589813 A CN202110589813 A CN 202110589813A CN 113445934 B CN113445934 B CN 113445934B
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- air bag
- elastic air
- vortex
- induced motion
- ocean platform
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention relates to a device for restraining vortex-induced motion of an ocean platform by utilizing wave force, which comprises an elastic air bag and a slotted pipe, wherein the elastic air bag is arranged on the elastic air bag; the elastic air bag is of a closed structure surrounding the platform upright post for a whole circle, is filled with gas and has the function of automatically recovering the original shape; the upper end of the slotted pipe is communicated with the elastic air bag, and the lower end of the slotted pipe extends into the water; the underwater part of the side surface of the slotted pipe is provided with a slit. The invention utilizes wave force to generate synthetic jet, has no energy consumption, injects favorable interference to the flow field, and strongly couples the synthetic jet with the main flow shear layer to inhibit the vortex-induced motion of the platform.
Description
Technical Field
The invention relates to a device for restraining vortex-induced motion of an ocean platform by utilizing wave force, and belongs to the technical field of ocean engineering.
Background
The ocean platform is a main force device for developing deep sea oil and gas resources in China at present, however, under the action of ocean current at a certain speed, periodic vortex shedding is generated behind an upright post of the platform alternately, drag force along the flow direction and lift force perpendicular to the flow direction are excited, and the platform moves greatly under the action of the pulsating load, which is called vortex-induced motion. Engineering actual measurement and research show that the vortex-induced motion can affect the fatigue life of a mooring system and a riser, increase the total damping of an ocean structure, and even lead to the damage of an ocean platform to cause accidents under severe conditions, such as a tension leg platform Typhoon overturning event in gulf of mexico.
The vortex-induced motion phenomenon mainly originates from pulsating fluid force generated by periodic vortex shedding behind the upright post. Therefore, the most fundamental method for inhibiting the vortex-induced motion response of the platform is to inhibit the vortex shedding of the upright column and reduce the pulsating fluid force. The strategy for inhibiting vortex shedding can be divided into active control and passive control according to whether energy is input into a flow field: the active control is to inject a proper disturbance mode into the flow field so as to couple with the internal mode of the system to achieve the control purpose, such as cylinder rotation oscillation, suction blowing jet flow, interactive feedback control and the like; the passive control mainly achieves the purpose of controlling the flow field through the optimization of a geometric profile or the addition of an appendage and the like. The invention provides a device and a method for generating synthetic jet flow by utilizing wave force to actively control a wake field of a platform and finally realize vortex-induced motion suppression.
Comparing the patent document list:
1. a device and a method for inhibiting marine riser vortex-induced vibration are disclosed in publication No. CN108194035A, publication No. 2018, 6 and 22.
2. A vibration suppressing device and method for discharging and sucking seawater by utilizing wave fluctuation pressure difference are disclosed in publication No. CN108590540A, published 2018, 9 and 28.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in the prior art, a passive control strategy is adopted to inhibit vortex shedding, the vortex-induced motion of an ocean platform is inhibited by optimizing the geometric shape of an upright post or installing an appendage, the method is effective only for a specific ocean current environment, the working condition is limited, and when the actual working condition deviates from the design state, the inhibition effect is poor; in the prior art, the vortex shedding is inhibited by adopting an active control strategy, the vortex shedding is only stopped at the stage of theoretical research, an additional power source is required, the implementation difficulty is high, and the vortex shedding is difficult to put into practical application.
The invention adopts the following technical scheme:
a device for restraining the vortex-induced motion of an ocean platform by utilizing wave force comprises an elastic air bag 1 and a slotted pipe; the elastic air bag 1 is of a closed structure surrounding the platform upright post for a whole circle, and the interior of the elastic air bag is filled with air; the upper end of the slotted pipe is communicated with the elastic air bag 1, and the lower end of the slotted pipe extends into the water; the underwater part of the side surface of the slotted pipe is provided with a slit 5.
Preferably, a guide rail is arranged between the elastic airbag 1 and the stand column, a fixed part of the guide rail is fixed on the surface of the stand column, and a moving part is fixedly connected with the inner side of the elastic airbag 1, so that the rotation of the elastic airbag 1 around the stand column can be realized.
Further, the guide rail is a steel ball slide rail 2, the steel ball slide rail 2 is composed of a groove-shaped rail 201, balls 202 and the moving part 203, wherein the groove-shaped rail is fixedly installed on the surface of the upright post, and the balls 202 are clamped into the groove of the rail to slide, so that the moving part 203 can be driven to move on the groove-shaped rail.
Preferably, the slotted pipe is a slotted round pipe 4.
Preferably, the side surface of the elastic airbag 1 is wedge-shaped with a big top and a small bottom.
Further, the elastic air bag 1 is made of an elastic material and can automatically restore to the original shape after being compressed by force.
Further, the elastic air bag 1 is arranged above the column draught.
Furthermore, three steel ball slide rails 2 which drive the elastic air bags to rotate are arranged on the surface of each upright column in the up-down direction.
Preferably, the elastic bladder 1 is connected to the slit tube by a valve 3.
Preferably, the slotted pipes are respectively positioned near the flow separation points on the two sides of the platform upright post.
A method for utilizing the wave force to inhibit the platform from moving in a whirlpool mode, adopt the above-mentioned device utilizing wave force to inhibit platform from moving in a whirlpool mode, slit lower end and slit position of tube stretch into underwater, under the influence of atmospheric pressure, the initial liquid level in the slit tube is as high as the external water level; when waves slam on the platform, the elastic air bag is compressed firstly, wherein gas moves in an accelerated manner and compresses liquid in the slotted pipe, and jet flow is finally sprayed to a flow field; when the waves fall back, the elastic air bag automatically returns to the original volume, wherein the pressure intensity is reduced, and the water in the flow field is sucked into the slit pipe to a certain height; the circulation is repeated, and a periodic fluid blowing and sucking phenomenon is generated at the position of the slot to form synthetic jet.
The invention has the beneficial effects that:
1) the wave force is utilized to generate synthetic jet, no energy consumption is realized, favorable interference is injected into a flow field, and the synthetic jet is strongly coupled with a main flow shear layer, so that the vortex-induced motion of the platform is inhibited;
2) the wedge-shaped air bag absorbs the wave force to the maximum extent, and the damage of the wave load to the ocean platform is reduced due to the wedge-shaped air bag; the wave slamming can be reduced to a certain extent under the extreme sea condition, and the wave climbing is inhibited;
3) the guide rail realizes the rapid adjustment of the generation position of the synthetic jet flow along with different incoming flow directions, ensures that the synthetic jet flow generates beneficial interference on a flow field all the time, and enlarges the working range of the synthetic jet flow generation device.
Drawings
FIG. 1 is a schematic diagram of the device for suppressing the vortex-induced motion of an ocean platform by utilizing wave force to generate synthetic jet according to the invention. The figures only show the slotted round tube on one side of the upright post, and a plurality of slotted round tubes can be actually arranged.
Fig. 2 is an overall schematic view of the device for suppressing the vortex-induced motion of the ocean platform by utilizing wave force, which is installed on the ocean platform.
Fig. 3 is a perspective view of the device for restraining the vortex-induced motion of the ocean platform by utilizing the wave force and the upright post which are fixedly installed.
Fig. 4 is a front view of the device for suppressing the vortex-induced motion of the ocean platform by utilizing wave force and the installation and fixation of the upright post.
Fig. 5 is a right side view of the device for suppressing the vortex-induced motion of the ocean platform by utilizing wave force and the upright post of the invention are fixedly installed.
Fig. 6 is a top view of the device for suppressing the vortex-induced motion of the ocean platform by utilizing wave force and the installation and fixation of the upright post.
FIG. 7 is a sectional view of the combination of the elastic air bag and the steel ball slide rail.
FIG. 8 is a schematic view of an inner section of a steel ball slide rail.
In the figure, 1-an elastic air bag, 2-a steel ball slide rail, 3-a valve, 4-a slotted circular tube, 5-a slit and 6-a floating body of an ocean platform; 201-grooved track, 202-balls, 203-moving parts.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The device for restraining the vortex-induced motion of the ocean platform mainly comprises an elastic air bag 1, a steel ball slide rail 2 and a slotted circular tube 4.
The elastic air bag 1 is of a closed structure which surrounds the platform upright post for a whole circle, the side surface is of a wedge shape with a big top and a small bottom, and the interior is filled with air; it is made of elastic material, and has an automatic recovery function after being stressed and compressed; is arranged above the draught of the upright post.
The steel ball slide rail 2 consists of a groove-shaped rail 201, a ball 202 and a moving part 203. The groove-shaped track 201 is installed on the surface of the upright post, and the balls 202 are clamped into the track grooves to slide, so that the moving part can be driven to move on the groove-shaped track 201. The elastic airbag 1 is fixedly connected with the moving part 203, so that the rotation of the elastic airbag 1 can be realized. Three groove-shaped rails 201 are arranged on the surface of each upright column in the up-down direction to drive the elastic air bag 1 to rotate.
The elastic air bag 1 is connected with a slotted round pipe 4 through a valve 3, the round pipe 4 extends into the water, and a slit 5 is arranged at the underwater part on the side surface of the round pipe 4; the circular tubes 4 with the slits 5 are respectively positioned near the flow separation points on the two sides of the platform upright post, because the research of the prior art shows that the suppression effect of injecting synthetic jet into the flow field at the position on vortex-induced motion is better.
Because the lower end of the circular tube 4 and the slit 5 extend into the water, the initial liquid level in the pipeline is as high as the external water level under the action of atmospheric pressure. When waves slam the platform, the elastic air bag 1 is compressed firstly, wherein gas moves in an accelerated manner and compresses liquid in the circular tube, and jet flow is finally sprayed to a flow field; when the waves fall back, the elastic air bag 1 automatically returns to the original volume, wherein the pressure intensity is reduced, and the water in the flow field is sucked into the round pipe to a certain height. The above steps are repeated in such a way, a periodic fluid blowing and sucking phenomenon is generated, and a synthetic jet is formed, as shown in fig. 1. The synthetic jet flow injects momentum into the wake field, and the momentum is strongly coupled with the boundary layer of the upright column, so that the vortex shedding strength at the rear of the upright column is weakened, the pulsating fluid load borne by the upright column is reduced, and the vortex-induced motion of the ocean platform is inhibited.
When the device is installed, firstly, three steel ball slide rails 2 which encircle the stand columns in a whole circle are fixedly installed on a certain stand column of a platform; then the elastic air bag 1 is fixedly connected to the moving part 203 of the slide rail 2, and the moving part 203 can drive the air bag 1 to rotate; the two valves 3 are respectively arranged at the lower part of the air bag 1; finally, two round pipes 4 with slits 5 are respectively connected with the outlets of the valves 3. Next, three other columns are installed in the same manner.
After the installation is finished, the ocean platform is conveyed to a certain deep sea area for operation, and the positions of the eight circular tubes 4 are adjusted by the slide rails 2 according to the ocean current direction when the platform is placed, so that the platform is ensured to be placed near a separation point. In the initial state, the valve 3 is closed, and the liquid level in the eight circular tubes 4 is as high as the external water level due to the existence of the slits and the action of the atmospheric pressure. After a period of time, opening the valve 3, wherein the wave slamming platform compresses the air bag 1 firstly, the gas moves in an accelerated manner and compresses liquid in the circular tube 4, and finally jet flow is ejected to a flow field; when the waves fall back, the air bag 1 automatically returns to the original volume, wherein the pressure intensity is reduced, and the water in the flow field is sucked into the circular tube 4 to a certain height. The synthetic jet flow is cyclically reciprocated to generate the synthetic jet flow which periodically and alternately blows and sucks the main flow. The synthetic jet flow injects momentum into the wake field, and the momentum is strongly coupled with the shear layer of the upright column, so that the vortex shedding strength behind the upright column is weakened, and the pulsating fluid load borne by the upright column is reduced, thereby inhibiting the vortex-induced motion of the ocean platform.
When the ocean platform carries out scientific investigation operation to next deep sea area, need not to install a whole set of device again, only need utilize slide rail 2 quick adjustment pipe 4's position according to different sea area environment, guarantee that it is located near stand separation point.
The present embodiment has the following three innovations:
innovation points 1: the wave force is used for generating synthetic jet flow, and vortex-induced motion is continuously inhibited.
The method comprises the following steps of compressing an elastic air bag capable of automatically recovering by utilizing periodic wave force to generate synthetic jet flow: when the wave force strikes the air bag, the air bag is compressed to accelerate the movement of air in the air bag, so that pressure is applied to liquid in the round tube, and finally jet flow is ejected into a flow field through the slit; when the waves fall back, the elastic air bag automatically returns to the original volume, wherein the pressure intensity is reduced, and water in the flow field is sucked into the circular tube through the slit. The above-mentioned circulation is repeated so as to form periodic blowing-sucking alternative synthetic jet flow, and it is strongly coupled with the boundary layer of the upright column, so that the vortex shedding strength behind the upright column can be weakened, and the fluid force borne by the upright column can be reduced so as to continuously produce inhibiting effect.
Innovation points 2: the wedge-shaped air bag with the large upper part and the small lower part is structurally designed to absorb wave force to the maximum extent.
Waves generally flow to the platform at a certain angle, and the air bag is compressed vertically as much as possible due to the design of the wedge-shaped structure, so that the wave force can be absorbed to the maximum extent, and synthetic jet with larger momentum is generated; meanwhile, the circular-ring-shaped air bag can absorb waves from all directions, can utilize the wave force most efficiently, reduces the wave slamming load to a certain extent and inhibits the climbing of the waves.
Innovation points 3: the synthetic jet generator has wide working range and good suppression effect.
The separation point position of the cylindrical streaming is related to the incoming flow direction, and researches show that synthetic jet flow is injected near the flow separation point and is strongly coupled with a main flow shear layer, so that the vortex shedding strength behind the upright post can be effectively reduced. The invention realizes the rotation of the synthetic jet generator by using the steel ball slide rail, and when the ocean platform carries out scientific investigation to the next deep sea area, the device can quickly adjust the jet generating position according to the incoming flow direction and always inject favorable interference to the flow field.
While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for restraining the vortex-induced motion of an ocean platform by utilizing wave force is characterized by comprising the following steps:
the device for restraining the vortex-induced motion of the ocean platform by utilizing the wave force comprises an elastic air bag (1) and a slotted pipe;
the elastic air bag (1) is of a closed structure surrounding the platform upright post for a whole circle, and the interior of the elastic air bag is filled with air;
the upper end of the slotted pipe is communicated with the elastic air bag (1), and the lower end of the slotted pipe extends into the water; the underwater part of the side surface of the slotted pipe is provided with a slit (5);
the lower end and the slit part of the slotted pipe extend into the water, and the initial liquid level in the slotted pipe is as high as the external water level under the action of atmospheric pressure;
when waves slam on the platform, the elastic air bag is compressed firstly, wherein gas moves in an accelerated manner and compresses liquid in the slotted pipe, and jet flow is finally sprayed to a flow field;
when the waves fall back, the elastic air bag automatically returns to the original volume, wherein the pressure intensity is reduced, and the water in the flow field is sucked into the slit pipe to a certain height;
the circulation is repeated, and a periodic fluid blowing and sucking phenomenon is generated at the slotting part to form synthetic jet;
a guide rail is arranged between the elastic air bag and the upright post, a fixed part of the guide rail is fixed on the surface of the upright post, and a moving part is fixedly connected with the inner side of the elastic air bag (1); when a new scientific investigation operation is carried out, the elastic air bag (1) rotates around the upright column by utilizing the guide rail according to different sea area environments, the position of the slotted tube is quickly adjusted, and the slotted tube is ensured to be positioned near a separation point of the streaming of the upright column.
2. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 1, wherein: the guide rail is a steel ball slide rail (2), the steel ball slide rail (2) is composed of a groove-shaped rail (201), balls (202) and the moving part (203), wherein the groove-shaped rail is fixedly installed on the surface of the upright post, and the balls (202) are clamped into the groove of the rail to slide, so that the moving part (203) can be driven to move on the groove-shaped rail.
3. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 1, wherein: the slotted pipe is a slotted round pipe (4).
4. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 1, wherein: the side surface of the elastic air bag (1) is in a wedge shape with a big top and a small bottom.
5. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 1, wherein: the elastic air bag (1) is made of elastic materials and can automatically recover after being compressed by force.
6. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 5, wherein: the elastic air bag (1) is arranged above the upright post for draught.
7. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 2, wherein: three steel ball slide rails (2) which drive the elastic air bags to rotate are arranged on the surface of each upright column in the up-down direction.
8. The method of suppressing ocean platform vortex-induced motion using wave forces according to claim 1, wherein: the elastic air bag (1) is connected with the slit pipe through a valve (3); the slotted pipes are respectively positioned near the flow separation points at the two sides of the platform upright post.
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| CN202110589813.9A CN113445934B (en) | 2021-05-28 | 2021-05-28 | Device for restraining vortex-induced motion of ocean platform by utilizing wave force |
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| CN202110589813.9A CN113445934B (en) | 2021-05-28 | 2021-05-28 | Device for restraining vortex-induced motion of ocean platform by utilizing wave force |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB974655A (en) * | 1959-12-01 | 1964-11-11 | Michinori Kurihara | Wave making resistance reducing apparatus |
| US3398758A (en) * | 1965-09-30 | 1968-08-27 | Mattel Inc | Pure fluid acoustic amplifier having broad band frequency capabilities |
| US20040149156A1 (en) * | 2003-02-03 | 2004-08-05 | Yi Henry Niuer | Tornadoes dynamic teardown system (TDTS) |
| CN102979490A (en) * | 2012-11-27 | 2013-03-20 | 西南石油大学 | Bubble-column vortex-induced vibration suppression device of stand pipe under marine environment |
| CN106917591B (en) * | 2016-04-01 | 2019-03-26 | 山东科技大学 | A kind of Puffer type active driving device for standpipe vortex-induced vibration |
| CN108571497A (en) * | 2017-03-08 | 2018-09-25 | 中国科学院力学研究所 | A kind of vortex-induced vibration suppression device |
| CN107461304B (en) * | 2017-09-11 | 2019-05-03 | 北京金风科创风电设备有限公司 | Surrounding body and equipment for inhibiting vibration of enclosure structure and method for hoisting tower drum |
| CN107724972B (en) * | 2017-11-07 | 2019-02-15 | 西南石油大学 | A kind of ocean flexible pipe protective device |
| CN107859492B (en) * | 2017-11-16 | 2019-05-03 | 西南石油大学 | The vortex-induced vibration suppression device and method of driving swingle rotation are streamed in a kind of allotment |
| CN107740752B (en) * | 2017-11-21 | 2019-02-22 | 北京金风科创风电设备有限公司 | Surround apparatus and method for suppressing vibration of building envelope |
| CN108590540B (en) * | 2018-05-04 | 2019-07-16 | 西南石油大学 | It is a kind of to arrange the vibration-repressing device and method for inhaling seawater using heaving of the sea pressure difference |
| CN111720068B (en) * | 2020-07-15 | 2022-03-15 | 大连理工大学 | Net-shaped flexible vertical pipe |
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