CN113502741A - Structure for inhibiting vortex-induced vibration of cylindrical structure - Google Patents
Structure for inhibiting vortex-induced vibration of cylindrical structure Download PDFInfo
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- CN113502741A CN113502741A CN202110659167.9A CN202110659167A CN113502741A CN 113502741 A CN113502741 A CN 113502741A CN 202110659167 A CN202110659167 A CN 202110659167A CN 113502741 A CN113502741 A CN 113502741A
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- vortex
- cylindrical structure
- induced vibration
- porous material
- cylindrical
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- 230000002401 inhibitory effect Effects 0.000 title claims description 6
- 239000011148 porous material Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 239000011247 coating layer Substances 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000010349 pulsation Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 12
- 229920000333 poly(propyleneimine) Polymers 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Wind Motors (AREA)
Abstract
本发明公开一种抑制圆柱形结构涡激振动的结构，在圆柱形结构的外表面覆盖一定厚度和孔隙数的多孔材料覆层，所述的多孔材料覆层的孔隙率不低于97％，每英寸孔隙数PPI＝15‑30，厚度＝1/8‑1/2倍的圆柱形结构直径。本发明通过合理设计覆层结构参数从而实现减弱的脉动荷载、按需求降低柱形结构涡激振动幅值。本发明可显著降低脉动升、阻力，进而抑制钝体结构涡激振动，同时具有使用简便的优点。
The invention discloses a structure for suppressing vortex-induced vibration of a cylindrical structure. The outer surface of the cylindrical structure is covered with a porous material coating with a certain thickness and number of pores, and the porosity of the porous material coating is not less than 97%. PPI = 15-30 pores per inch, thickness = 1/8-1/2 times the diameter of the cylindrical structure. The invention realizes the weakened pulsating load and reduces the vortex-induced vibration amplitude of the column structure according to the requirements by rationally designing the parameters of the cladding structure. The invention can significantly reduce the pulsation lift and resistance, thereby suppressing the vortex-induced vibration of the bluff body structure, and at the same time has the advantage of being easy to use.
Description
Technical Field
The invention relates to the field of flow-induced vibration, in particular to a structure for inhibiting vortex-induced vibration of a cylindrical structure.
Background
The flow-induced vibration refers to structural vibration caused when fluid passes through a structure, and is a flexible body or an elastic support rigid body commonly found in wind, rivers and ocean currents, such as a stay cable, a suspender, an overhead power transmission line, a high tower, an ocean riser and the like of a bridge. Vortex-induced vibration is one of the most common flow-induced vibration phenomena. As the fluid bypasses the structure, vortex shedding occurs at the back of the structure. When the vortex shedding is close to the natural vibration frequency of a certain order of the structure, the vortex shedding is coupled with the structure vibration and mutually promoted, so that vortex-induced resonance with larger amplitude is induced. The requirement of the flow velocity of vortex-induced vibration is low, the induced frequency is high, the amplitude is possibly large, the safety and the durability of the structure are affected, and the structure cannot be normally used.
At present, the control method of vortex-induced vibration can be mainly divided into two types, one is boundary layer control, and the other is wake flow control. In the boundary layer control method, the surface of the structure is mainly modified, such as pits, spiral lines, traveling waves, local rough elements and the like. The curling of the shear layer in the near wake region is inhibited by changing the separation point and the stability of the boundary layer, so that the vortex shedding and the structural coupling degree are reduced. In the wake flow control method, a splitter plate or other auxiliary structures are arranged in a wake flow area, so that the generation of vortices is inhibited, and the vortex-induced vibration amplitude is reduced. In addition, the active and passive air suction and blowing devices can simultaneously act on the boundary layer and the wake region according to the arrangement positions of the air holes, thereby achieving good control effect. The existing vortex-induced vibration control methods have certain limitations, the control effect of pits and spiral lines on vortex-induced vibration is limited, the traveling wave and active air suction and blowing devices are complex in structure, need to be electrified to operate, and are sensitive to an attack angle, the control effect is weakened after the incoming flow direction is changed, and even the opposite control effect can be achieved. Local asperities, baffles and ancillary structures also present problems of anisotropy. In addition, most of the above control measures require that the structure be installed when shipped from the factory, and the existing structure cannot be installed in the later period, so the application range is limited.
Disclosure of Invention
Based on the above disadvantages, the present invention aims to provide a structure for suppressing vortex-induced vibration of a cylindrical structure, which applies a porous material coating to a cylindrical structure passing through an air flow or a water flow, and realizes reduced pulsation load and reduced vortex-induced vibration amplitude of the cylindrical structure as required by reasonably designing the structural parameters of the coating.
The purpose of the invention is realized as follows: a structure for inhibiting vortex-induced vibration of a cylindrical structure is characterized in that the outer surface of the cylindrical structure is covered with a porous material coating with certain thickness and porosity, the porosity of the porous material coating is not lower than 97%, the porosity per inch PPI is 15-30, and the thickness is 1/8-1/2 times of the diameter of the cylindrical structure.
The invention also has the following technical characteristics
1. The cylindrical structure is in a fixed shape, a flexible shape or an elastic shape.
2. The porous material coating is cylindrical, the inner section of the cylinder is consistent with the section of the controlled cylindrical structure, and the coating is sleeved outside the controlled cylindrical structure during use without any mode of bonding or adjustment of wind attack angle.
3. The porous material coating is made of foamed polyurethane or foamed metal material.
The invention has the advantages that: the invention can obviously change the wake vortex shedding mode of the cylindrical structure. When the number of the holes is low, a large amount of fluid passes through the inside of the porous material coating, so that the stability of the separation flow shear layer of the near field is improved, and the shear layer is forced to curl in the far field to form a vortex. The vortices formed in the far field have less interaction with the structure and thus the vortex-induced vibrations are suppressed. The invention can obviously reduce the pulse rise and the resistance, further inhibit the vortex-induced vibration of the bluff body structure, and has the advantage of simple and convenient use.
Drawings
FIG. 1 is a schematic diagram of a vortex-induced vibration control method based on a porous material coating;
FIG. 2 is a comparison graph of porous material coatings at different PPIs and diameters;
FIG. 3 is a graph comparing the effect of porous material coatings of different PPI and diameter on the control of the pulsating load of a fixed cylindrical structure;
FIG. 4 is a graph comparing the control effect of porous material overlayer with different PPIs and diameters on a fixed cylindrical structure wake field;
FIG. 5 is a graph comparing the control effect of porous material coatings of different PPI and diameter on the amplitude of vortex-induced vibration of an elastic support cylinder;
FIG. 6 is a graph comparing the control effect of porous material cladding on elastically supported cylindrical vortex-induced vibration flow fields for different PPIs and diameters;
Detailed Description
The invention will be further illustrated by way of example with reference to the accompanying drawings.
Example 1
A structure for inhibiting vortex-induced vibration of a cylindrical structure is characterized in that a porous material coating layer 1 with certain thickness and porosity is covered on the outer surface of the cylindrical structure 2, the porosity of the porous material coating layer 1 is not lower than 97%, the porosity per inch PPI is 15-30, and the diameter of the cylindrical structure is 1/8-1/2 times as thick. The porous material coating is made of foamed polyurethane or foamed metal material.
With reference to fig. 1, 2, 3 and 4, the present embodiment is suitable for reducing the pulsating load of a fixed columnar structure. When the structure is fixed, the pulse amplitude of the lift and resistance can be reduced by the porous material coating layer with any thickness and number of holes. The larger the pulsation increases and the larger the reduction amplitude of the resistance increases with the increase of the flow rate. The reason is that the wake vortex position is greatly pushed back, and the influence on the structure is weakened. The thickness of the coating is increased, and the number of pores is reduced, so that the pulsation load is reduced. Wherein the lowest resistance load pulsation can reach 1/3 of the uncontrolled column at the wind speed of 20m/s, and the lowest lift load pulsation can reach 2 percent of the uncontrolled column.
Example 2
With reference to fig. 1, 5 and 6, the present embodiment is suitable for reducing the amplitude of vortex-induced vibrations of a flexibly or elastically supported columnar structure. This example is the effect of vortex-induced vibration amplitude control of cylindrical structures of laboratory elastic supports. The rigidity of the column structure is 753.9K.m, the damping is 0.6%, the diameter of the nonporous structure is 0.04m, the coating thickness of the porous material is 5-20mm, and the structure dimensionless thickness D after coating is applied＊Is (D +2D)/D is 1.25-2.
When PPI is less than 30, vortex-induced vibration amplitude is effectively inhibited. The control effect of the coating with low pore number and high thickness is better. Wherein, the lowest vortex-induced vibration amplitude can be reduced to 4% of the uncontrolled working condition.
Example 3
With reference to fig. 5 and 6, when PPI is greater than 30, the vortex-induced vibration amplitude is effectively increased, the enhancement effect of the high-porosity and high-thickness coating is better, and the vortex-induced vibration of the flexible or elastic supported cylindrical structure is enhanced, wherein the vortex-induced vibration amplitude can reach up to 200% of the uncontrolled working condition. The vortex-induced vibration of the cylindrical structure is suitable for enhancing the flexibility or elastic support. In summary, when the number of pores is high, the flow through the interior of the porous material is small and has no significant effect on the stability of the separation flow shear layer. The ensemble of cladding and controlled structure components is closer to a solid mass, and the increase in size induces higher magnitude vortex-induced vibrations.
Claims (4)
1. The structure for inhibiting the vortex-induced vibration of the cylindrical structure is characterized in that the outer surface of the cylindrical structure is covered with a porous material coating layer with certain thickness and porosity, the porosity of the porous material coating layer is not lower than 97%, the porosity per inch is PPI (pore number) 15-30, and the diameter of the cylindrical structure is 1/8-1/2 times as thick.
2. A structure for suppressing vortex-induced vibration of a cylindrical structure as defined in claim 1, wherein: the cylindrical structure is in a fixed shape, a flexible shape or an elastic shape.
3. A structure for suppressing vortex-induced vibration of a cylindrical structure as defined in claim 2, wherein: the porous material coating is cylindrical, the inner section of the cylinder is consistent with the section of the controlled cylindrical structure, and the coating is sleeved outside the controlled cylindrical structure during use without any mode of bonding or adjustment of wind attack angle.
4. A structure for suppressing vortex-induced vibration of a cylindrical structure as defined in any one of claims 1 to 3, wherein: the porous material coating is made of foamed polyurethane or foamed metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110659167.9A CN113502741A (en) | 2021-06-15 | 2021-06-15 | Structure for inhibiting vortex-induced vibration of cylindrical structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110659167.9A CN113502741A (en) | 2021-06-15 | 2021-06-15 | Structure for inhibiting vortex-induced vibration of cylindrical structure |
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| Publication Number | Publication Date |
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| CN113502741A true CN113502741A (en) | 2021-10-15 |
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| CN202110659167.9A Pending CN113502741A (en) | 2021-06-15 | 2021-06-15 | Structure for inhibiting vortex-induced vibration of cylindrical structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199616A (en) * | 2022-07-05 | 2022-10-18 | 上海交通大学 | A device for suppressing flow-induced vibration and its application |
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| WO2006138354A2 (en) * | 2005-06-16 | 2006-12-28 | Shell Internationale Research Maatschappij B.V. | Systems and methods for reducing drag and/or vortex induced vibration |
| WO2007149770A2 (en) * | 2006-06-19 | 2007-12-27 | Shell Oil Company | Vortex induced vibration suppression systems and methods |
| CN102966313A (en) * | 2012-11-16 | 2013-03-13 | 西南石油大学 | Marine riser ocean flow response surface additional layer |
| 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 |
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2021
- 2021-06-15 CN CN202110659167.9A patent/CN113502741A/en active Pending
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199616A (en) * | 2022-07-05 | 2022-10-18 | 上海交通大学 | A device for suppressing flow-induced vibration and its application |
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Application publication date: 20211015 |
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