CN114838235A - Vortex-induced vibration suppression device additionally provided with fish scale-shaped protruding marine riser - Google Patents
Vortex-induced vibration suppression device additionally provided with fish scale-shaped protruding marine riser Download PDFInfo
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- CN114838235A CN114838235A CN202210178739.6A CN202210178739A CN114838235A CN 114838235 A CN114838235 A CN 114838235A CN 202210178739 A CN202210178739 A CN 202210178739A CN 114838235 A CN114838235 A CN 114838235A
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- riser
- vortex
- fish scale
- induced vibration
- scale
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a vortex-induced vibration suppression device additionally provided with a fish scale-shaped protrusion riser, which comprises a riser and fish scale-shaped protrusions, wherein the riser is arranged inside the riser, the fish scale-shaped protrusions are fixed on the periphery of the riser, the fish scale-shaped protrusions are arranged in multiple layers, the fish scale-shaped protrusions on different layers are arranged in a spiral line along the axis direction of the riser, and the number of the fish scale-shaped protrusions on each layer is the same as that of the spiral line. The invention has better effect on inhibiting the vortex-induced vibration in the vertical pipe and has low manufacturing cost.
Description
Technical Field
The invention relates to the field of vortex-induced vibration suppression in a riser in ocean engineering, in particular to a vortex-induced vibration suppression device additionally provided with a fish scale-shaped protruding riser.
Background
The riser is used as the only connecting structure of the offshore platform, the main function is to convey oil and gas resources to the offshore production platform, the damage of the riser can cause the leakage of the oil and gas resources, the vortex-induced vibration phenomenon is an important reason for the damage of the riser, when water flows through the cylinder structure, vortices which fall off alternately can be formed in the wake flow area of the cylinder, and when the frequency of the vortex fall off is close to the natural frequency of the cylinder, the cylinder can generate vortex-induced vibration, so that the structure safety is greatly influenced. For the vortex-induced vibration which occurs already, the suppression effect on the vortex-induced vibration can be realized by changing the surface roughness of the cylinder.
At present, the suppression of vortex-induced vibration is mainly divided into two methods: active suppression and passive suppression. The active inhibition utilizes the technical means of real-time monitoring, automatic control of a computer and the like, and introduces external interference measures into a flow field through the analysis of actually measured data, thereby controlling vortex shedding. Passive suppression reduces the damage from vortex induced vibrations, primarily by changing the shape of the structure or adding other structures to alter the flow field around the structure. The active suppression cost is high, most of the devices mainly suppress the vortex-induced vibration in a passive suppression mode, and the vortex-induced vibration suppression is realized by additionally arranging the guide plate and the spiral strake, but the two devices have the disadvantages of higher cost, heavier weight and lower cost performance.
Disclosure of Invention
The invention provides a vortex-induced vibration suppression device additionally provided with a fish scale-shaped protruding marine riser, which can suppress vortex-induced vibration in the marine riser.
The invention provides a vortex-induced vibration suppression device additionally provided with a fish scale-shaped protrusion riser, which comprises a riser and fish scale-shaped protrusions, wherein the riser is arranged inside the riser, the fish scale-shaped protrusions are fixed on the periphery of the riser, the fish scale-shaped protrusions are arranged in multiple layers, the fish scale-shaped protrusions on different layers are arranged in a spiral line along the axis direction of the riser, and the number of the fish scale-shaped protrusions on each layer is the same as that of the spiral line.
Further, the thickness of the riser is 0.04 times of the inner diameter of the riser.
Further, the maximum thickness of the fish-scale-shaped protrusion is the same as the thickness of the riser.
Further, the distance between two adjacent layers of the fish-scale protrusions is 15 times of the diameter of the vertical pipe.
Furthermore, the number of the fish scale-shaped protrusions on each layer is 12.
Furthermore, the fish scale-shaped protrusions are made of polyurethane elastomers.
The invention has the technical effects that: 1. the fish scale-shaped bulges can effectively reduce the damage of vortex-induced vibration to the bulges, and prolong the service life of the device;
2. the simple protrusion structure is adopted, the installation is simple, and the scale-shaped protrusions have a good vortex-induced vibration suppression effect;
3. the marine riser is simple in assembly mode, the manufacturing process is simplified, the cost is reduced, and the influence of marine organism growth on the marine riser is effectively avoided.
4. It can reduce the drag force increased by the large change in roughness, compared to the spherical protrusion device.
5. The vortex-induced vibration suppression device is installed in a layered mode, the installation process is greatly simplified, and meanwhile due to the installation characteristics, the installation process and the laying process can be combined, and the workload is greatly reduced.
Drawings
FIG. 1 is a schematic view of a fish scale shaped protrusion in a preferred embodiment of the present invention;
fig. 2 is a schematic perspective view of a preferred embodiment of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in fig. 1 to 2, an embodiment of the present invention provides a vortex-induced vibration suppression device with an additional fish scale-shaped protruding marine riser 2, which changes the arrangement of the vortex-induced vibration suppression device to make the vortex-induced vibration suppression device take a spiral shape as a whole, and can achieve the effect of suppressing vibration for incoming flows in various directions, and while ensuring that the vortex-induced vibration can be suppressed, the vortex-induced vibration suppression device has the advantages of simple process and low cost, and overcomes the defects in the prior art.
The utility model provides an install protruding riser 2's of fish scale shape vortex induced vibration suppression device additional, includes that riser 2 and fish scale shape are protruding 1, riser 2 locates the inside of riser, and fish scale shape is suddenly fixed in riser 2's periphery, and the protruding 1 multilayer setting that divide of fish scale shape, different layer protruding 1 of fish scale shape is the helix arrangement on following riser 2 axis direction, and the protruding 1 quantity of fish scale shape on each layer is the same with the quantity of helix. The riser 2 is of annular construction, as is the riser.
The fish scale-shaped protrusions 1 are arranged in layers, gaps are reserved between adjacent layers, the number of the fish scale-shaped protrusions 1 in each layer is 12, and certain gaps are reserved between the fish scale-shaped protrusions 1 in each layer.
The spiral line is a curve wound on a cylindrical surface or a conical surface, and the intersection angle theta of the tangent line of the spiral line and a fixed straight line (the generatrix of the curved surface) is constant.
When the line of action L is parallel to the axis Oz, it is called a cylindrical spiral. The method is a space curve which is most widely applied in engineering, and a parameter equation of the method is as follows:
Z＝bθ
in order to ensure the service life of the inhibiting device, the outer surfaces of the fish scale-shaped bulges 1 are coated with anticorrosive coatings.
Experimental research shows that the thickness of the marine riser 2 has an important influence on the suppression effect of vortex-induced vibration, and the experimental conclusion suggests that the thickness of the marine riser 2 needs to be selected according to the inner diameter of the marine riser, and when the thickness of the marine riser 2 is 0.04 times of the inner diameter of the marine riser 2, the effect of suppressing the vortex-induced vibration is the best.
The arrangement density of the fish scale-shaped bulges has an important influence on the inhibition of the vortex-induced vibration, when the arrangement density is too high, the drag force of the riser is greatly increased, and when the arrangement density is low, the effect of inhibiting the vortex-induced vibration for incoming flows in different directions is different, so that 12 fish scale-shaped bulges are arranged on each layer of the outer surface of the riser 2, and the effect of inhibiting the vortex-induced vibration is optimal.
The fish scale-shaped protrusions 1 meet the requirements of bionics, the protrusions are not too thick, the weight of the riser is increased, the cost is increased, and the inhibition effect of the protrusions on vortex-induced vibration cannot meet the design requirements due to too low thickness, so that the maximum thickness of the fish scale-shaped protrusions is equal to the thickness of the riser 2 and is 0.04 times of the inner diameter of the riser 2.
The pitch of the spiral line is 15 times of the diameter of the riser, the number of the spiral lines is equal to that of the protrusions on each layer, the intersection point of the circular line formed by the protrusions on each layer and the spiral line is used as the center point of the surface of the protrusion, which is connected with the riser 2, and the fish scale-shaped protrusions 1 are arranged on the center point.
In order to ensure the service life of the fish scale shaped protrusion 1, the fish scale shaped protrusion is made of polyurethane elastomer. Thermoplastic polyurethane elastomers, with their excellent properties and widespread use, have become one of the important thermoplastic elastomeric materials, whose molecules are substantially linear with no or little chemical crosslinking. The linear polyurethane has physical crosslinking formed by a plurality of hydrogen bonds among molecular chains, and the hydrogen bonds have a strengthening effect on the form of the linear polyurethane, so that a plurality of excellent performances such as high modulus, high strength, excellent wear resistance, chemical resistance, hydrolysis resistance, high low temperature resistance and high mold resistance are endowed. Because it is a substantially linear polymer, it can be processed using the same techniques and equipment as thermoplastics, such as injection molding, extrusion, blow molding, calendering, etc., and is particularly suitable for mass production of medium and small size parts. The waste material can be recycled and reused, and different additives or fillers can be used in the production or processing process to improve certain physical properties and reduce the cost.
Aiming at the mechanism of the deep sea riser vortex-induced vibration suppression, incoming flow always generates falling vortex at the rear end of the bluff body, so that the lift force of the bluff body with periodic change is influenced, but for different structures, the falling frequency of the vortex can be changed due to the difference of the shapes of the structures. Vortex-induced vibration suppression is realized by changing the roughness of the vertical pipe, and the maximum response amplitude and the maximum average resistance coefficient are reduced and tend to be constant values along with the increase of the roughness of the cylinder. The "lock frequency" of the cylinder with rough surface is gradually delayed, and the width of the locking zone is obviously reduced under higher roughness. The strouhal number increases slightly with increasing roughness. The dynamic average resistance of the cylinder with the rough surface is smaller than that of the cylinder with the smooth surface, and the uniform roughness is beneficial to reducing the generation of vortex-induced vibration.
The principle of the spiral strake is that the fish scale-shaped protrusions 1 arranged in a spiral line can change the wave flow separation angle along the longitudinal direction of the pipe, so that the spatial correlation of the vortex is disturbed, the vortex is dispersed, the strength of the vortex is weakened, and the lift force is reduced.
The installation and the laying of the marine riser are carried out simultaneously, before the marine riser enters water, a cutting line is calculated according to the diameter of the riser, the layered vortex-induced vibration suppression device made of the polyurethane elastomer is cut, the cut layered vortex-induced vibration suppression device is transported into an installation butt joint of the marine riser, the cut layered vortex-induced vibration suppression device wraps a layer of the marine riser 2, heating treatment is carried out, the cut sections are spliced, and finally a layered structure arranged on the marine riser is formed. And the next layer is provided with the mounting device to rotate to ensure that the rotation angle of the mounting device is the same as the change angle of the layered arrangement, so that the operation is repeated, and finally the structural form of the vortex-induced vibration suppression device which presents spiral line rising is formed by mounting.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. The utility model provides an install protruding marine riser's of fish scale vortex induced vibration suppression device which characterized in that additional: the novel marine riser comprises a riser and scale-shaped protrusions, wherein the riser is arranged inside the riser, the scale-shaped protrusions are fixed on the periphery of the riser, the scale-shaped protrusions are arranged in multiple layers, the scale-shaped protrusions on different layers are arranged along the axis direction of the riser in a spiral line mode, and the number of the scale-shaped protrusions on each layer is the same as the number of the spiral lines.
2. The vortex-induced vibration suppression device with the fish scale shaped raised riser according to claim 1, wherein: the riser has a thickness of 0.04 times its inner diameter.
3. The vortex-induced vibration suppression device for installing the fish scale-shaped protruding riser according to claim 2, wherein: the maximum thickness of the fish scale-shaped protrusions is the same as the thickness of the marine riser.
4. The vortex-induced vibration suppression device with the fish scale shaped raised riser according to claim 1, wherein: the distance between two adjacent layers of the fish-scale-shaped protrusions is 15 times of the diameter of the vertical pipe.
5. The vortex-induced vibration suppression device with the fish scale shaped raised riser according to claim 1, wherein: the number of the fish scale-shaped protrusions on each layer is 12.
6. The vortex-induced vibration suppression device with the fish scale shaped raised riser according to claim 1, wherein: the fish scale-shaped bulges are made of polyurethane elastomers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210178739.6A CN114838235B (en) | 2022-02-25 | 2022-02-25 | Vortex-induced vibration suppression device with fish scale-shaped protruding marine riser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210178739.6A CN114838235B (en) | 2022-02-25 | 2022-02-25 | Vortex-induced vibration suppression device with fish scale-shaped protruding marine riser |
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| Publication Number | Publication Date |
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| CN114838235A true CN114838235A (en) | 2022-08-02 |
| CN114838235B CN114838235B (en) | 2023-06-27 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6695540B1 (en) * | 2000-11-14 | 2004-02-24 | Weldon Taquino | Vortex induced vibration suppression device and method |
| CN101387188A (en) * | 2008-11-04 | 2009-03-18 | 中国海洋大学 | Suppressing vibration method for marine riser vortex-induced vibration and suppressing vibration apparatus thereof |
| CN202510918U (en) * | 2012-04-27 | 2012-10-31 | 西南石油大学 | W-shaped device for inhibiting vortex induced vibration of marine riser |
| CN203515368U (en) * | 2013-10-23 | 2014-04-02 | 西南石油大学 | Riser vortex inducting vibration suppression device with rough undulating surface |
| CN207004441U (en) * | 2017-07-24 | 2018-02-13 | 西南石油大学 | A kind of surface sets screw slotting and raised standpipe vortex-induced vibration suppression device |
| CN112145857A (en) * | 2020-08-14 | 2020-12-29 | 海洋石油工程股份有限公司 | Vortex-induced vibration suppression device for marine flexible riser |
-
2022
- 2022-02-25 CN CN202210178739.6A patent/CN114838235B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6695540B1 (en) * | 2000-11-14 | 2004-02-24 | Weldon Taquino | Vortex induced vibration suppression device and method |
| CN101387188A (en) * | 2008-11-04 | 2009-03-18 | 中国海洋大学 | Suppressing vibration method for marine riser vortex-induced vibration and suppressing vibration apparatus thereof |
| CN202510918U (en) * | 2012-04-27 | 2012-10-31 | 西南石油大学 | W-shaped device for inhibiting vortex induced vibration of marine riser |
| CN203515368U (en) * | 2013-10-23 | 2014-04-02 | 西南石油大学 | Riser vortex inducting vibration suppression device with rough undulating surface |
| CN207004441U (en) * | 2017-07-24 | 2018-02-13 | 西南石油大学 | A kind of surface sets screw slotting and raised standpipe vortex-induced vibration suppression device |
| CN112145857A (en) * | 2020-08-14 | 2020-12-29 | 海洋石油工程股份有限公司 | Vortex-induced vibration suppression device for marine flexible riser |
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