CN115095627A - Miniature fin for tower vibration reduction - Google Patents
Miniature fin for tower vibration reduction Download PDFInfo
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- CN115095627A CN115095627A CN202210912277.6A CN202210912277A CN115095627A CN 115095627 A CN115095627 A CN 115095627A CN 202210912277 A CN202210912277 A CN 202210912277A CN 115095627 A CN115095627 A CN 115095627A
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- 230000009467 reduction Effects 0.000 title claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 17
- 238000013016 damping Methods 0.000 claims description 16
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a micro fin for tower vibration reduction, which is integrally formed with a tower through a stamping technology, a plurality of towers are arranged side by side to form a side-by-side tower structure, each tower consists of a plurality of cylindrical structures, and in the side-by-side tower structure, if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is less than or equal to 1.3, the tower is defined as a small-distance side-by-side tower structure; if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is more than or equal to 1.3, defining the tower structure with the large distance in parallel, wherein the micro fins are arranged on the tower which is positioned at the most upstream in the structure of the tower with the small distance in parallel, the micro fins are also arranged on the tower which is positioned at the most downstream in the structure of the tower with the large distance in parallel, and a plurality of micro fins are arranged on the circumference of the outer wall of each cylindrical structure on the tower provided with the micro fins in a surrounding manner at equal intervals; the range of the height l of the micro fin is 0.7D-0.9D, and the range of the thickness b is 0.08D-0.1D.
Description
Technical Field
The invention relates to the field of vibration reduction and vibration prevention of wind load borne by a tower, in particular to a micro fin for vibration reduction of the tower, which can be applied to industries such as petroleum, chemical engineering, pharmacy and the like.
Background
The tower is a device for finishing the technical processes of rectification, extraction, absorption and the like in the industries of petrochemical industry, coal chemical industry, chemical fiber, pharmacy and the like. The tower is closely related to each operation unit in the chemical process, the investment occupation ratio in all chemical equipment is up to 25% -45%, in recent years, along with the adjustment of product structure, the improvement of production capacity, the optimization of technological process and the rapid development of the chemical equipment manufacturing industry in China, the tower is enlarged, the diameter of the tower can reach 13m and the height of the tower is close to 130m, and the tower has the characteristics of large height-diameter ratio, low inherent frequency and small damping ratio. When the tower is placed outdoors, the tower is inevitably subjected to wind load, and wind-induced vibration is very easy to occur, so that the tower is damaged and failed, and therefore, the flow-induced vibration analysis and vibration reduction and vibration prevention design of the tower becomes a research focus and a technical difficulty for large-scale development of chemical devices. Except the condition that the tower is directly destroyed and loses efficacy in extreme strong wind weather, the fatigue damage caused by the influence of cyclic stress on the tower body is more common in medium and low wind speeds, the vortex naturally formed after wind blows on the tower equipment falls off to cause the equipment surface to receive periodic pulsation, the length-diameter ratio of the tower is generally larger, the high-altitude stress of the tower vibrates, the falling form of the vortex is further influenced by the vibration of the structure, the flow-induced vibration phenomenon of wind and tower body fluid-solid coupling is finally formed, the frequency locking phenomenon can occur when the falling frequency of the vortex is close to the inherent frequency of the tower, and the large amplitude vibration is caused, once the damage caused reaches the fatigue limit of the tower body, the local part of the equipment or even the whole can lose efficacy.
In recent years, under the development trend of large-scale intensification of chemical equipment, the arrangement of towers is more and more compact, and meanwhile, as the requirement on the purification precision of products such as silicon, methanol and the like is continuously improved, the effect of single-tower production in the process can not meet the requirement, and the parallel towers adopting a multi-stage parallel operation process are widely applied. Whether the tower is reliable direct influence the safety and stability of production, and because the tower is compared side by side and flows to cause the vibration condition more complicated, single tower design theory can't be suitable for, in case lead to appearing the vibration accident in the actual production, the loss can be very serious, therefore how the damping of tower is the problem that awaits a urgent need to solve side by side.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a micro fin for damping vibration of a tower, which avoids the tower from generating large vibration under wind load and realizes vibration damping and vibration prevention.
The purpose of the invention is realized by the following technical scheme:
a micro fin for damping vibration of towers is characterized in that a plurality of towers are arranged side by side to form a side-by-side tower structure, each side-by-side tower is composed of a plurality of cylindrical structures, and in the side-by-side tower structure, if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is less than or equal to 1.3, the small-distance side-by-side tower structure is defined; if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is more than or equal to 1.3, defining the tower structure as a large-distance parallel tower structure, wherein the micro fins are arranged on the tower which is positioned at the most upstream in the small-distance parallel tower structure, the micro fins are also arranged on the tower which is positioned at the most downstream in the large-distance parallel tower structure, and a plurality of micro fins are arranged on the periphery of the outer wall of the tower provided with the micro fins in an equidistant surrounding manner;
the range of the height l of the micro fin is 0.7D-0.9D, and the range of the thickness b is 0.08D-0.1D.
Furthermore, the included angle between two adjacent micro fins on the same cylindrical structure is 30 degrees.
Further, in the same tower axis direction, the two fins on adjacent cylindrical structures are staggered by 15 ° from each other.
Further, the tower length D is 25 mm.
Furthermore, the micro fins are integrally formed and installed on the outer side of the tower through a stamping technology.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the miniature fins are directly arranged on the tower through a stamping technology after the design is finished, so that the surface shear stress and aerodynamic force distribution state of the tower are changed, the starting vibration speed of the tower is greatly increased, and the tower does not vibrate within the designed flow speed range. The micro fin designed by the equivalent surface roughness simplified design method simulates ribs and circular arc grooves among the ribs, has a good vibration reduction effect, and is also beneficial to processing and installation.
2. The micro fin is designed aiming at multi-tower flow-induced vibration control based on bionics and according to a peltate structure on the surface of the sharkskin, is corrugated integrally and is of a smooth strip structure. Under the engineering application, under the condition of high flow speed (Ur is more than or equal to 20), aiming at small-space parallel towers (L/D is less than or equal to 1.3), small-sized micro fins are arranged on the surface of an upstream tower, so that the surface shear stress and aerodynamic force distribution can be changed, the position of a separation point is advanced, the vibration of the tower is inhibited, the amplitude of a tower body is quickly attenuated, and the amplitude of the tower body is reduced, thereby avoiding the vibration damage of the tower. For large-space parallel towers (L/D is more than 1.3), a micro fin module with larger size is installed on a downstream tower, the synergistic effect of upstream wake vortexes and self vortex shedding is destroyed, and the vibration of the parallel towers is effectively inhibited.
3. The invention does not completely destroy the regular Karman vortex at the tail part of the tower, but changes the surface flow velocity and the shearing force through the formed groove structure, influences the separation of a fluid boundary layer and realizes the vibration control. The small micro-fins (l is less than or equal to 0.9D, and the thickness b is less than or equal to 0.08D) are arranged on the upstream tower (the tower towards which the wind blows), so that the amplitude of the downstream tower (the tower towards which the wind flows through the upstream tower) is reduced by 33.3 percent. The vibration reduction device has the characteristics of easiness in installation, remarkable vibration reduction effect and easiness in popularization.
Drawings
Fig. 1a and fig. 1b are schematic views of a micro fin structure with a thickness b of 0.08D and a height l of 0.9D according to an embodiment of the present invention.
Fig. 2a and fig. 2b are schematic diagrams of a structure of a micro fin having a thickness b of 0.1D and a height l of 0.9D according to an embodiment of the present invention.
Fig. 3a and fig. 3b are schematic diagrams of a micro fin structure with a thickness b of 0.08D and a height l of 0.7D according to an embodiment of the present invention.
Fig. 4 is a schematic diagram showing the effect of the present invention mounted on the surface of the cylindrical structure of the tower.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1 to 4, for the actual engineering problem of the existing parallel towers, the embodiment provides a vibration-proof micro fin for towers, wherein a plurality of towers are arranged side by side to form a parallel tower structure, each tower is formed by a plurality of cylindrical structures, and in the parallel tower structure, if the ratio of the circle center distance L between two adjacent towers to the diameter D of the tower is less than or equal to 1.3, the structure is defined as a small-distance parallel tower structure; if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is more than or equal to 1.3, the tower is defined as a large-distance parallel tower structure, the micro fins 2 are arranged on the tower which is positioned at the most upstream in the small-distance parallel tower structure, the micro fins 2 are also arranged on the tower which is positioned at the most downstream in the large-distance parallel tower structure, and in the embodiment, 12 micro fins 2 are arranged on the periphery of the outer wall of each cylindrical structure on the tower provided with the micro fins in an equidistant surrounding manner.
In the embodiment, the tower is installed by adopting a stamping technology and is formed by an integral forming technology. The outer surface of the chemical tower is provided with the heat-insulating layer wrapped by smooth light metal, the metal has good ductility, the heat-insulating layer can be processed into a miniature fin module meeting the requirement by adopting a stamping technology and integrated molding, and the whole body is installed on the outer surface of the tower during hoisting. The tower vibration damping device can achieve excellent vibration damping effect on the premise of not increasing extra structures of the tower and not welding.
The arrangement density, height and size of the added micro-fins 2 all influence the amplitude of the tower. Through analysis, the micro fins 2 which are sparsely arranged and lower are in the optimal shape. The micro fins which are sparsely arranged and lower have weak influence on the shear layer and the wake vortex structure, the groove structure on the surface can increase the flow velocity and the shear stress of fluid, the boundary layer separation is advanced, the medium-scale vortex structure is generated, and then the lift coefficient is changed to realize the vibration control. The thickness of the micro-fins adopted by the embodiment can be changed between 2mm and 2.5mm, and the height can be changed between 17.5mm and 22.5 mm.
When the pitch ratio L/D is 1.3, the microfin with the thickness b of 2.5 mm/height L of 22.5mm can reduce the amplitude of the upstream tower by 69.47%; the microfin with thickness b of 2 mm/height l of 17.5mm and thickness b of 2 mm/height l of 22.5mm can reduce the upstream tower amplitude by 78.63%. The damping performance of the three-size micro-fins on a downstream tower (a tower in which wind flows through an upstream tower) is approximate to 35%;
when the spacing ratio L/D is larger than or equal to 2.0, the micro fins with three sizes can obviously reduce the maximum transverse wind direction amplitude of the upstream tower and is very close to the tower amplitude (0.675mm) formed by a single cylindrical structure.
When the pitch ratio is more than or equal to 2 and less than or equal to 8, the micro-fin with the thickness b of 2.5mm and the height L of 22.5mm has obvious vibration reduction effect, and the amplitude of the upstream tower can be reduced by 86.46-95.67%. Although the micro fins with the thickness b of 2 mm/height l of 17.5mm and the thickness b of 2 mm/height l of 22.5mm can reduce the amplitude of the parallel towers to a certain extent (5.89% -64.68%), the vibration characteristics of the model are similar to those of a smooth tower, and the galloping phenomenon still occurs in the upstream tower and the downstream tower. The size parameters of the micro fins are very sensitive to the vibration damping performance, the thickness b of the micro fins is recommended to be more than or equal to 0.1D when the distance ratio is more than or equal to 2 and less than or equal to 8, the height L of the micro fins is more than or equal to 0.9D, and the coverage rate of the micro fins is not less than 30%.
The main influencing factors of the damping effect of the micro-fin are as follows:
1. influence of aerodynamic properties
The main mechanism of flow-induced vibration control of the micro fins in the parallel tower structure (the number of the towers is more than or equal to 2) is to increase the shear stress of surface fluid and advance the position of a separation point, so that the aerodynamic force distribution is influenced, and the vibration acceleration or the vibration suppression is realized. The small-size micro-fins only increase the resistance of the fluid on the surface of the cylindrical structure in the tower, advance the separation point, change the aerodynamic force distribution and effectively reduce the flow-induced vibration of the multi-tower. However, if the size parameter of the micro-fin is too large, the vortex breaking capability is enhanced, and the mechanism is not applicable.
2. Influence of packing Density and height
Through experimental data analysis, when the micro fins are densely and highly distributed, the divergent galloping-like phenomenon of the upstream tower (the tower blown by wind) completely disappears, but the flow velocity U is in turn determined by the flow velocity r >60, the vibration of the downstream tower (the tower to which the wind flows through the upstream tower) is enhanced to exhibit divergent sag-like vibration, and thus, the micro-fins contribute to the vibration of the multi-tower structure. While the micro-finWhen the arrangement is sparse and low, the divergent galloping-like phenomenon of the upstream tower completely disappears, and the downstream tower is in a U shape r >And obvious vibration occurs at 60 hours, and the amplitude is reduced, so that the micro fins greatly increase the starting vibration speed of the parallel towers, the vibration does not occur within the designed flow speed range, and the vibration of the multi-tower towers is approximately considered to be inhibited. Therefore, the micro fins which are arranged sparsely and are lower have better vibration reduction effect.
3. Influence of size
When the micro-fins are larger in size, their vortex breaking effect is enhanced, which can increase the vibration of each tower, since the irregular small-scale vortices promote the multi-tower flow to vibrate. For engineering structures such as side-by-side towers and the like, the general vibration control refers to damping specifically, and the amplitude of the damping should be reduced, so that the size of the micro fins is as small as possible, the small-size micro fins only increase the resistance of fluid on the surface of the tower, separate points in advance, change aerodynamic force distribution, and effectively reduce flow-induced vibration of the multi-tower structure.
Finally, it should be pointed out that: the above examples are merely illustrative of the computational process of the present invention and are not limiting thereof. Although the present invention has been described in detail with reference to the foregoing examples, it should be understood by those skilled in the art that the calculation processes described in the foregoing examples can be modified or equivalent substitutions for some of the parameters may be made without departing from the spirit and scope of the calculation method of the present invention.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A micro fin for tower vibration reduction is characterized in that a plurality of towers are arranged side by side to form a side-by-side tower structure, each side-by-side tower is composed of a plurality of cylindrical structures, and in the side-by-side tower structure, if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is less than or equal to 1.3, the structure is defined as a small-distance side-by-side tower structure; if the ratio of the circle center distance L of two adjacent towers to the diameter D of the tower is more than 1.3, defining the tower structure as a large-distance parallel tower structure, wherein the micro fins are arranged on the tower which is positioned at the most upstream in the small-distance parallel tower structure, the micro fins are also arranged on the tower which is positioned at the most downstream in the large-distance parallel tower structure, and a plurality of micro fins are arranged on the periphery of the outer wall of the tower on which the micro fins are arranged in a surrounding manner at equal intervals;
the height l of the micro-fin ranges from 0.7D to 0.9D, and the thickness b ranges from 0.08D to 0.1D.
2. The microfin for tower vibration damping as claimed in claim 1, wherein the angle between two adjacent microfins on the same cylindrical structure is 30 °.
3. A microfin for tower vibration damping as claimed in claim 1 wherein two fins on adjacent cylindrical structures are offset from each other by 15 ° in the direction of the same tower axis.
4. A microfin for tower damping as claimed in claim 1 wherein the tower length D is 25 mm.
5. The microfin for tower vibration damping as claimed in claim 1, wherein the microfin is integrally formed on the outside of the tower by stamping technique.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210912277.6A CN115095627A (en) | 2022-07-29 | 2022-07-29 | Miniature fin for tower vibration reduction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210912277.6A CN115095627A (en) | 2022-07-29 | 2022-07-29 | Miniature fin for tower vibration reduction |
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| CN115095627A true CN115095627A (en) | 2022-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115681380A (en) * | 2022-10-27 | 2023-02-03 | 天津大学 | V-shaped fin for tower vibration reduction |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402000A (en) * | 2008-10-27 | 2009-04-08 | 杭州中泰过程设备有限公司 | Plate-fin stuffing rectification column |
| WO2018149527A1 (en) * | 2017-02-15 | 2018-08-23 | Siemens Wind Power A/S | Building structure with means to reduce induced vibrations |
| CN114233783A (en) * | 2021-12-06 | 2022-03-25 | 天津大学 | D-shaped fin for tower vibration reduction |
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2022
- 2022-07-29 CN CN202210912277.6A patent/CN115095627A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402000A (en) * | 2008-10-27 | 2009-04-08 | 杭州中泰过程设备有限公司 | Plate-fin stuffing rectification column |
| WO2018149527A1 (en) * | 2017-02-15 | 2018-08-23 | Siemens Wind Power A/S | Building structure with means to reduce induced vibrations |
| CN114233783A (en) * | 2021-12-06 | 2022-03-25 | 天津大学 | D-shaped fin for tower vibration reduction |
Non-Patent Citations (1)
| Title |
|---|
| 谭蔚等: "并排塔器的横风向激振特性与非光滑表面减振", 化工进展, vol. 41, no. 4, pages 1750 - 1758 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115681380A (en) * | 2022-10-27 | 2023-02-03 | 天津大学 | V-shaped fin for tower vibration reduction |
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