CN111350725B - Vortex-induced vibration suppression and resistance reduction device and method - Google Patents
Vortex-induced vibration suppression and resistance reduction device and method Download PDFInfo
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- CN111350725B CN111350725B CN202010120340.3A CN202010120340A CN111350725B CN 111350725 B CN111350725 B CN 111350725B CN 202010120340 A CN202010120340 A CN 202010120340A CN 111350725 B CN111350725 B CN 111350725B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/0005—Baffle plates
Abstract
The invention provides a vortex-induced vibration suppression and resistance reduction device, which comprises an annular body and a connecting piece, wherein the annular body is arranged on the periphery of a cylindrical structure; the axis of the annular hole of the annular body is parallel to the axis of the cylindrical structure; the annular body is provided with an opening penetrating through the annular wall of the annular body; the inner circumferential surface of the annular body, which is opposite to the cylindrical structure, is a first cambered surface, and an overflowing gap is formed between the first cambered surface and the outer circumferential surface of the cylindrical structure; the connecting piece connects the annular body and the cylindrical structure. The invention also provides a vortex-induced vibration suppression and resistance reduction method. The invention uses the first cambered surface to block the downwind airflow entering the overflowing gap, so that the airflow changes the flowing direction and flows to the two ends along the axial direction of the annular body, thereby not only inhibiting the vortex-induced vibration of the cylindrical structure, but also reducing the resistance borne by the cylindrical structure, and the annular body has simple structure, convenient manufacture and low production cost.
Description
Technical Field
The invention belongs to the technical field of reducing the aerodynamic resistance of a cylindrical structure under the action of a fluid and inhibiting vortex-induced vibration of the cylindrical structure, and particularly relates to a vortex-induced vibration inhibiting and reducing device and a vortex-induced vibration inhibiting and reducing method.
Background
The cylindrical structure can generate downwind and crosswind forces, namely drag and lift, under the action of airflow. When the cylindrical structure is placed in a flow field, on one hand, the windward side of the cylindrical structure can generate positive pressure, and the leeward side of the cylindrical structure can generate negative pressure, so that a pressure difference is formed, and the cylindrical structure can bear the resistance in the downwind direction; on the other hand, boundary layer separation occurs in a wake flow area of the cylindrical structure, vortices which are continuously and alternately shed are generated, a periodic force transverse to the wind direction is generated on the cylindrical structure in the flow field, so that the cylindrical structure vibrates and is accompanied by noise, namely vortex-induced vibration occurs, when the vortex shedding frequency is close to the natural frequency of the cylindrical structure, the amplitude of the cylindrical structure is remarkably increased, and then vortex-induced resonance occurs on the cylindrical structure. The cylindrical structure with large slenderness ratio is very sensitive to wind load, and vortex-induced resonance can occur at low wind speed, so that the cylindrical structure is subjected to fatigue failure, and the service life is influenced.
The vortex-induced vibration suppression measures mainly comprise three major types, namely structural measures, mechanical measures and pneumatic measures, and the conventional pneumatic method for suppressing the vortex-induced vibration of the cylindrical structure is various, such as a spiral line, a fairing, a traveling wave wall and the like. However, they have certain limitations in the use process, such as the winding spiral line can increase the resistance of the cylindrical structure while inhibiting the vibration; the fairing can reduce the resistance while suppressing vibration, but the design is complex and the cost is high; the travelling wave wall has complex structure and high cost, and is not beneficial to large-area popularization and use.
Disclosure of Invention
The invention aims to provide a vortex-induced vibration suppression and resistance reduction device and a vortex-induced vibration suppression and resistance reduction method, and aims to solve the technical problems that the vortex-induced vibration structure of a cylindrical structure is complex in design, high in structural cost or large in resistance borne by the cylindrical structure in a pneumatic mode in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a vortex-induced vibration suppression and resistance reduction device, including:
the annular body is arranged on the periphery of the cylindrical structure; the axis of the annular hole of the annular body is parallel to the axis of the cylindrical structure; the annular body has an opening through an annular wall thereof; the inner circumferential surface of the annular body, which is opposite to the cylindrical structure, is a first arc surface, and an overflowing gap is formed between the first arc surface and the outer circumferential surface of the cylindrical structure;
and the connecting piece is used for connecting the annular body and the cylindrical structure.
As another embodiment of the present invention, a central angle of the opening is 150 ° or more and 240 ° or less.
As another embodiment of the present invention, the opening penetrates in an axial direction of the annular body.
As another embodiment of the invention, the distance of the overflowing gap is 0.2-0.3D, wherein D is the outer diameter of the cylindrical structure.
As another embodiment of the present invention, the outer peripheral surface of the annular body is a second arc surface, and a center of the second arc surface coincides with a center of the first arc surface.
The vortex-induced vibration suppression and resistance reduction device provided by the invention has the beneficial effects that: compared with the prior art, the vortex-induced vibration suppression and resistance reduction device has the advantages that the annular body only requires the inner peripheral surface opposite to the cylindrical structure to be the first cambered surface, and other structures are not limited, so that the vortex-induced vibration suppression and resistance reduction device is simple in structure and low in manufacturing cost; the annular body is connected with the cylindrical structure through the connecting piece, during assembly, only the axis of the annular hole of the annular body is required to be parallel to the axis of the cylindrical structure, and assembly of other parts is not required, so that the assembly mode is simple and convenient;
the first cambered surface can block the air current that flows into the downwind direction in the overflowing clearance, change the flow direction of air current, make partial air current along the axial of cyclic annular body to both ends dispersion flow, the swirl that drops in turn that the leeward side of cylindrical structure thing produced can be destroyed to the air current of axial flow, reduce the periodic force that the swirl drops and produce, restrain cylindrical structure thing vortex induced vibration, and still can weaken the negative pressure of leeward side, change the wind pressure distribution of the leeward side of cylindrical structure thing, and then reduce the pressure differential of the windward side and the leeward side of cylindrical structure thing, reduce the resistance that cylindrical structure thing received.
The invention also provides a vortex-induced vibration suppression and resistance reduction method, which comprises the following steps:
the vortex-induced vibration suppression and resistance reduction device is arranged at the position of the axial center of the cylindrical structure, the opening faces the windward side of the cylindrical structure, and the first cambered surface is positioned on the leeward side of the cylindrical structure;
when the fluid flows through the cylindrical structure, part of the fluid enters the overflowing gap from the opening and collides with the first cambered surface, and the fluid dispersedly flows towards two ends along the axial direction of the annular body under the blockage of the first cambered surface;
fluid flowing in a dispersing way along the axial direction of the annular body to two ends breaks alternately falling vortexes generated by the leeward side of the cylindrical structure, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure is inhibited;
fluid which flows along the axial direction of the annular body in a dispersed manner to the two ends can also change the wind pressure distribution of the leeward side of the cylindrical structure, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure and reduce the resistance borne by the cylindrical structure.
As another embodiment of the present invention, the connecting member is a bearing;
when fluid flows through the cylindrical structure, the bearing rotates, so that the opening is always towards the windward side of the cylindrical structure.
The invention also provides a vortex-induced vibration suppression and resistance reduction method, which comprises the following steps:
a plurality of the vortex-induced vibration suppression and resistance reduction devices are arranged on the cylindrical structure at intervals along the axial direction of the cylindrical structure, and the directions of the openings of the plurality of annular bodies are different;
when the fluid flows through the cylindrical structure, part of the fluid enters the overflowing gap from the opening of at least one annular body and collides with the first cambered surface, and the fluid dispersedly flows towards two ends along the axial direction of the annular body under the blockage of the first cambered surface;
fluid flowing in a dispersing way along the axial direction of the annular body to two ends breaks alternately falling vortexes generated by the leeward side of the cylindrical structure, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure is inhibited;
fluid which flows along the axial direction of the annular body in a dispersed manner to the two ends can also change the wind pressure distribution of the leeward side of the cylindrical structure, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure and reduce the resistance borne by the cylindrical structure.
The vortex-induced vibration suppression and resistance reduction method provided by the invention has the beneficial effects that: compared with the prior art, the vortex-induced vibration inhibiting and resistance reducing method has the advantages that the first cambered surface is used for blocking downwind airflow entering the overflowing gap, so that the airflow changes the flowing direction and flows to the two ends along the axial direction of the annular body, the vortex-induced vibration of the cylindrical structure can be inhibited, and the resistance borne by the cylindrical structure can be reduced; experiments prove that the distance of the airflow blocked by the first cambered surface along the axial direction is not less than ten times of the axial length of the annular body.
Drawings
FIG. 1 is a schematic structural diagram of a vortex-induced vibration suppression and damping device according to an embodiment of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a wind pressure distribution diagram of a cylindrical structure;
FIG. 4 is a graph of the variation of the drag coefficient of a cylindrical structure with Reynolds number;
FIG. 5 is a diagram showing a wind pressure distribution rule of a leeward side of a cylindrical structure;
FIG. 6 is a schematic view of the amplitude of a cylindrical structure as a function of wind speed;
FIG. 7 is a graph of displacement time course of a cylindrical structure without the vortex-induced vibration suppression and drag reduction device provided by the embodiment of the invention at a wind speed of 4.8 m/s;
FIG. 8 is a graph of displacement time course of a cylindrical structure equipped with the vortex-induced vibration suppression and drag reduction device provided by the embodiment of the invention at a wind speed of 4.8 m/s.
In the figure: 1. an annular body; 11. an opening; 12. a first arc surface; 13. a second arc surface; 14. a plane; 15. an over-current gap; 2. a connecting member; 3. a cylindrical structure; α, central angle of opening.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2 together, the vortex-induced vibration suppression and damping device provided by the present invention will now be described. The vortex-induced vibration suppression and resistance reduction device comprises an annular body 1 and a connecting piece 2.
The annular body 1 is used for being arranged on the periphery of a cylindrical structure 3; the axis of the annular hole of the annular body 1 is parallel to the axis of the cylindrical structure 3; the annular body 1 has an opening 11 through its annular wall; the inner circumferential surface (i.e. the hole wall surface of the annular hole) of the annular body 1 opposite to the cylindrical structure 3 is a first arc surface 12, and an overflow gap 15 is formed between the first arc surface 12 and the outer circumferential surface of the cylindrical structure 3. The connecting piece 2 connects the annular body 1 and the cylindrical structure 3.
It should be noted that the connecting member 2 can be installed in place during the manufacturing process of the cylindrical structure 3, or can be installed in place after the cylindrical structure 3 is erected.
Specifically, when the annular body 1 and the connecting piece 2 are installed, the opening 11 is preferably oriented towards the windward side of the cylindrical structure 3, and the first cambered surface 12 is located at the leeward side of the cylindrical structure 3. When fluid (such as air current) flows from the windward side to the leeward side of the cylindrical structure 3, part of the fluid enters the flow gap 15 from the opening 11 when flowing through the cylindrical structure 3.
After the vortex-induced vibration suppression and resistance reduction device provided by the invention is arranged on the cylindrical structure 3, when the cylindrical structure 3 is subjected to downwind airflow, part of the airflow enters the overflowing gap 15 from the opening 11, the first cambered surface 12 can block the downwind airflow flowing into the overflowing gap 15, the flowing direction of the airflow is changed, and part of the airflow is enabled to dispersedly flow towards two ends along the axial direction of the annular body 1, the airflow flowing in the axial direction can destroy alternately-falling vortexes generated on the leeward surface of the cylindrical structure 3, so that the periodic force generated by vortex falling is reduced, the vortex-induced vibration of the cylindrical structure 3 is suppressed, the negative pressure of the leeward surface is weakened, the wind pressure distribution of the leeward surface of the cylindrical structure 3 is changed, the pressure difference between the windward surface and the leeward surface of the cylindrical structure 3 is further reduced, and the resistance borne by the cylindrical structure 3 is reduced.
Compared with the prior art, the vortex-induced vibration suppression and resistance reduction device provided by the invention has the advantages that the annular body 1 only requires the inner peripheral surface opposite to the cylindrical structure 3 to be the first cambered surface 12, and other structures are not limited, so that the vortex-induced vibration suppression and resistance reduction device is simple in structure and low in manufacturing cost; the annular body 1 is connected with the cylindrical structure 3 through the connecting piece 2, and during assembly, only the axis of the annular hole of the annular body 1 is required to be parallel to the axis of the cylindrical structure 3, and the assembly of other parts is not required, so that the assembly mode is simple and convenient.
Referring to fig. 1 and 2, as an embodiment of the vortex-induced vibration suppression and damping device provided in the present invention, a central angle α of the opening 11 is greater than or equal to 150 ° and less than or equal to 240 °. The opening 11 can be understood as a hole penetrating through the annular wall of the annular body 1 in the radial direction of the annular body 1, the center of the opening 11 is the center of the annular body 1, and the central angle α of the opening 11 is the angle between two straight lines from the two open ends of the annular body 1 to the center of the circle.
Alpha is more than or equal to 150 degrees and less than or equal to 240 degrees, partial air flow can be ensured to smoothly enter the overflowing gap 15 from the opening 11, the first cambered surface 12 is ensured to have enough area for colliding with the air flow, and the air flow can flow along the axial direction of the annular body 1.
Specifically, the opening 11 also penetrates in the axial direction of the annular body 1, that is, the annular body 1 is actually a semi-ring structure, so that the annular body 1 has a simple structure and is low in manufacturing cost.
Referring to fig. 1 and fig. 2, as an embodiment of the vortex-induced vibration suppression and drag reduction device provided by the present invention, an axial length of the annular body 1 is D, and a distance of the flow gap 15 is 0.2 to 0.3D, where D is an outer diameter of the cylindrical structure 3.
Experiments prove that the axial length of the annular body 1 is equal to the outer diameter of the cylindrical structure 3, the overflowing gap 15 (namely the radial distance between the first cambered surface 12 and the outer peripheral surface of the cylindrical structure 3) is 0.2-0.3 times of the outer diameter of the cylindrical structure 3, the design size of the annular body 1 is within the numerical range, and the resistance coefficient of the cylindrical structure 3 can be effectively reduced.
Referring to fig. 1 and 2, as an embodiment of the vortex-induced vibration suppression and resistance reduction device provided by the present invention, the outer circumferential surface of the annular body 1 is a second arc surface 13, the center of the second arc surface 13 coincides with the center of the first arc surface 12, and the second arc surface 13 and the first arc surface 12 are transited through an inclined plane 14 or an inclined arc surface.
The outer peripheral surface of the annular body 1 is also an arc surface, that is, the radial section of the annular body 1 is C-shaped, so that the annular body 1 has a simple structure and is convenient to process and manufacture.
The thickness of the annular wall of the annular body 1 depends on the material to be processed, and when a metal material having high strength and rigidity is used, a small thickness may be used for weight reduction, and when a brittle plastic material or the like is used, a large thickness may be used.
The invention also provides a vortex-induced vibration suppression and resistance reduction method, which comprises the following steps:
the vortex-induced vibration suppression and resistance reduction device is arranged at the position of the axial center of the cylindrical structure 3, the opening 11 faces the windward side of the cylindrical structure 3, and the first cambered surface 12 faces the leeward side of the cylindrical structure 3;
when fluid flows from the windward side to the leeward side of the cylindrical structure 3, when the fluid flows through the cylindrical structure 3, the fluid partially enters the overflowing gap 15 from the opening 11 and collides with the first cambered surface 12, and the fluid dispersedly flows to the two ends along the axial direction of the annular body 1 under the blocking of the first cambered surface 12;
fluid flowing in a dispersed manner along the axial direction of the annular body 1 to two ends breaks vortex generated by the leeward side of the cylindrical structure 3 and falls off alternately, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure 3 is inhibited;
fluid which flows along the axial direction of the annular body 1 to two ends in a dispersed manner can also change the wind pressure distribution of the leeward side of the cylindrical structure 3, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure 3 and reduce the resistance borne by the cylindrical structure 3.
In order to ensure that the opening 11 always faces the windward side of the cylindrical structure 3, in the embodiment, the connecting piece 2 is a bearing; when the fluid flows through cylindrical structure 3, the bearing can drive annular body 1 to rotate to make opening 11 all the time towards the windward side of cylindrical structure 3, the concrete rotation mode of bearing can be through PLC control (if install its pivoted motor of drive on the bearing, with PLC control bearing pivoted angle), or can install the fin on annular body 1, the fluid can promote the fin to rotate, and then drives annular body 1 and bearing rotation.
The invention also provides a vortex-induced vibration suppression and resistance reduction method, which comprises the following steps:
a plurality of the vortex-induced vibration suppression and damping devices are arranged on the cylindrical structure 3 at intervals along the axial direction of the cylindrical structure, and the directions of the openings 11 of the plurality of annular bodies 1 are different;
when fluid flowing from the windward side to the leeward side of the cylindrical structure 3 flows through the cylindrical structure 3, part of the fluid enters the overflowing gap 15 from the opening 11 of at least one annular body 1 and collides with the first cambered surface 12, and the fluid dispersedly flows towards the two ends along the axial direction of the annular body 1 under the blocking of the first cambered surface 12;
fluid flowing in a dispersed manner along the axial direction of the annular body 1 to two ends breaks vortex generated by the leeward side of the cylindrical structure 3 and falls off alternately, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure 3 is inhibited;
fluid which flows along the axial direction of the annular body 1 to two ends in a dispersed manner can also change the wind pressure distribution of the leeward side of the cylindrical structure 3, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure 3 and reduce the resistance borne by the cylindrical structure 3.
Because a plurality of the vortex-induced vibration suppression and damping devices are axially and alternately arranged on the cylindrical structure 3, the orientations of the openings 11 of the plurality of annular bodies 1 are different, and the central angles α of the openings 11 are as follows: alpha is 150 DEG-240 DEG so that it is ensured that at least one opening 11 of the annular body 1 is directed towards the windward side of the cylindrical structure 3.
In this embodiment, the connecting member 2 is a rod-shaped structure, one end of which is fixed on the outer circumferential surface of the cylindrical structure 3, and the other end of which is fixed with the annular body 1. The specific connection form of the connecting member 2 with the cylindrical structure 3 and the annular body 1 is not limited.
The vortex-induced vibration suppression and resistance reduction methods provided by the two embodiments have the beneficial effects that: compared with the prior art, the vortex-induced vibration inhibiting and resistance reducing method has the advantages that the first cambered surface 12 is used for blocking downwind airflow entering the overflowing gap 15, so that the airflow changes the flowing direction and flows to the two ends along the axial direction of the annular body 1, the vortex-induced vibration of the cylindrical structure 3 can be inhibited, and the resistance borne by the cylindrical structure 3 can be reduced; tests have shown that the distance along which the gas flow blocked by the first cambered surface 12 flows in the axial direction is not less than ten times the axial length of the annular body 1.
The calculation formula of the resistance coefficient of the cylindrical structure 3 is:
in the formula: cD-dimensionless aerodynamic drag coefficient;
rho-air Density (kg/m)3)；
FD-aerodynamic resistance per unit length (N);
u-reference wind speed average (m/s);
d-the outer diameter (m) of the cylindrical structure 3.
In the constant laminar flow, the wake zone of the cylindrical structure 3 generates alternately-falling vortices, and the falling vortices generate periodic cross-wind lifting force F on the cylindrical structure 3LThereby causing the cylindrical structure 3 to vibrate in the cross wind direction; in the flow field, positive pressure is formed on the windward side of the cylindrical structure 3 and negative pressure is generated on the leeward side of the cylindrical structure 3, so that the cylindrical structure 3 is subjected toA downwind drag FD。
In order to reduce the aerodynamic resistance of the cylindrical structure 3 and inhibit the vortex-induced vibration of the cylindrical structure 3, the vortex-induced vibration inhibition and resistance reduction methods provided by the two embodiments are utilized to carry out tests, the tests are carried out in a high-speed section of an atmospheric boundary layer wind tunnel center STU-1 wind tunnel laboratory of wind engineering research center of Shijiazhuang railway university, the wind speed can reach 80.0m/s to the maximum extent, the turbulence degree of a test section region is not more than 0.5%, the speed instability is less than 1%, and the deflection angle of average airflow is less than 1 deg.
In the test model, the axial length of the cylindrical structure 3 is 1.7m, the outer diameter D is 0.15m, the axial length of the annular body 1 is D, the central angle α of the opening 11 is 180 °, and the flow gap 15 is 0.2D.
Fig. 3 is a wind pressure distribution diagram of the cylindrical structure 3, and it can be seen from the diagram that, compared with the wind pressure distribution of the cylindrical structure 3 without the annular body 1, the wind pressure distribution of the cylindrical structure 3 with the annular body 1 installed has almost no difference, the wind suction force of the leeward side is reduced, some regions even become wind pressure, the wind pressure distribution of the windward side does not change, and the wind suction force of the leeward side is reduced, thus the wind load resistance at the position of the cylindrical structure 3 with the annular body 1 is reduced.
Fig. 4 is a graph of the variation law of the drag coefficient of the cylindrical structure 3 with the reynolds number, and it can be seen from the graph that the drag coefficient of the cylindrical structure 3 is obviously reduced in a lower reynolds number region, which shows that the drag reduction effect of the vortex-induced vibration suppression and drag reduction method is significant in a low reynolds number region.
Fig. 5 is a diagram showing a wind pressure distribution rule of the leeward side of the cylindrical structure 3, where S is a distance from the test position to the axial center of the annular body 1, and D is a diameter of the cylindrical structure 3. It can be seen that the cylindrical structure 3 has a tendency to reduce the windy suction over a substantial axial distance after the annular body 1 has been installed. In order to further verify, high-frequency force measuring balances are arranged at the two ends of the test model to test the wind load of the whole model, and the result shows that under the condition of low Reynolds number, for the whole cylindrical structure 3, when the annular body 1 is not arranged, the resistance coefficient is about 1.2, after the annular body 1 is arranged, the resistance coefficient is about 0.9, and the resistance coefficient is reduced by about 25%. That is, the present invention can reduce the wind load of the cylindrical structure 3 by about 25%.
Fig. 6 is a schematic view showing the variation of the amplitude of the cylindrical structure 3 with the wind speed, and it can be seen that the amplitude of the cylindrical structure 3 with the annular body 1 installed is significantly smaller than that of the cylindrical structure 3 without the annular body 1.
FIG. 7 is a graph of displacement time course of a cylindrical structure 3 without a vortex-induced vibration suppression and drag reduction device at a wind speed of 4.8 m/s; fig. 8 is a graph of displacement time-course of the cylindrical structure 3 provided with the vortex-induced vibration suppression and resistance reduction device at the wind speed of 4.8m/s, and comparing the two graphs, it can be seen that the cylindrical structure 3 can effectively suppress vortex-induced vibration after being provided with the annular body 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. Vortex-induced vibration suppression and damping device, its characterized in that includes:
the annular body is arranged on the periphery of the cylindrical structure; the axis of the annular hole of the annular body is parallel to the axis of the cylindrical structure; the annular body has an opening through an annular wall thereof; the inner circumferential surface of the annular body, which is opposite to the cylindrical structure, is a first arc surface, and an overflowing gap is formed between the first arc surface and the outer circumferential surface of the cylindrical structure;
a connecting member connecting the annular body and the cylindrical structure;
the opening faces the windward side of the cylindrical structure, and the first cambered surface is located on the leeward side of the cylindrical structure; when the cylindrical structure is subjected to downwind airflow, part of the airflow enters the overflowing gap from the opening, and the first cambered surface is used for blocking the downwind airflow flowing into the overflowing gap so as to change the flowing direction of the airflow and enable the part of the airflow to dispersedly flow towards two ends along the axial direction of the annular body.
2. The vortex induced vibration suppression and drag reduction device of claim 1, where the central angle of the opening is 150 ° or greater and 240 ° or less.
3. The vortex induced vibration suppression and drag reduction device of claim 2, wherein said opening is through in an axial direction of said annular body.
4. The vortex induced vibration suppression and drag reduction device of any of claims 1-3, wherein the distance of the flow gap is 0.2-0.3D, where D is the outer diameter of the cylindrical structure.
5. The vortex-induced vibration suppression and drag reduction device of any one of claims 1-3, wherein the outer circumferential surface of the annular body is a second cambered surface, and the center of the second cambered surface coincides with the center of the first cambered surface.
6. The vortex-induced vibration suppression and resistance reduction method is characterized by comprising the following steps:
mounting the vortex induced vibration suppression and drag reduction device of any one of claims 1 to 5 at a location axially centered on a cylindrical structure with the opening facing a windward side of the cylindrical structure and the first cambered surface being on a leeward side of the cylindrical structure;
when the fluid flows through the cylindrical structure, part of the fluid enters the overflowing gap from the opening and collides with the first cambered surface, and the fluid dispersedly flows towards two ends along the axial direction of the annular body under the blockage of the first cambered surface;
fluid flowing in a dispersing way along the axial direction of the annular body to two ends breaks alternately falling vortexes generated by the leeward side of the cylindrical structure, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure is inhibited;
fluid which flows along the axial direction of the annular body in a dispersed manner to the two ends can also change the wind pressure distribution of the leeward side of the cylindrical structure, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure and reduce the resistance borne by the cylindrical structure.
7. The vortex induced vibration suppression and drag reduction method of claim 6, where said connection is a bearing;
when fluid flows through the cylindrical structure, the bearing rotates, so that the opening is always towards the windward side of the cylindrical structure.
8. The vortex-induced vibration suppression and resistance reduction method is characterized by comprising the following steps:
mounting a plurality of vortex induced vibration suppression and drag reduction devices according to any one of claims 1 to 5 on a cylindrical structure at intervals along an axial direction thereof, the openings of the plurality of annular bodies being oriented differently;
when the fluid flows through the cylindrical structure, part of the fluid enters the overflowing gap from the opening of at least one annular body and collides with the first cambered surface, and the fluid dispersedly flows towards two ends along the axial direction of the annular body under the blockage of the first cambered surface;
fluid flowing in a dispersing way along the axial direction of the annular body to two ends breaks alternately falling vortexes generated by the leeward side of the cylindrical structure, so that the periodic force generated by vortex falling is reduced, and vortex-induced vibration of the cylindrical structure is inhibited;
fluid which flows along the axial direction of the annular body in a dispersed manner to the two ends can also change the wind pressure distribution of the leeward side of the cylindrical structure, weaken the negative pressure of the leeward side, further reduce the pressure difference between the windward side and the leeward side of the cylindrical structure and reduce the resistance borne by the cylindrical structure.
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| US6401646B1 (en) * | 2000-09-14 | 2002-06-11 | Aims International, Inc. | Snap-on rotating reduction fairing |
| KR20140111103A (en) * | 2013-03-06 | 2014-09-18 | 삼성중공업 주식회사 | Pipe structure |
| CN203296718U (en) * | 2013-06-24 | 2013-11-20 | 西南石油大学 | Diversion type vortex-induced vibration suppressing device |
| CN109905056A (en) * | 2017-12-11 | 2019-06-18 | 中国石油大学(华东) | A kind of vortex-induced vibration of marine riser collection of energy and active suppression device and method based on piezoelectric ceramics |
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