CN114033634B - Device for inhibiting vortex-induced resonance of wind turbine - Google Patents
Device for inhibiting vortex-induced resonance of wind turbine Download PDFInfo
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- CN114033634B CN114033634B CN202111387688.XA CN202111387688A CN114033634B CN 114033634 B CN114033634 B CN 114033634B CN 202111387688 A CN202111387688 A CN 202111387688A CN 114033634 B CN114033634 B CN 114033634B
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- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 9
- 230000001629 suppression Effects 0.000 claims abstract description 69
- 238000009434 installation Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 abstract description 16
- 230000005611 electricity Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a device for inhibiting vortex-induced resonance of a wind turbine, and belongs to the technical field of wind turbines. The wind turbine blade and tower wind turbine blade vortex-induced vibration suppression device comprises a plurality of groups of blade vortex-induced vibration suppression devices and a plurality of groups of tower wind turbine blade vortex-induced vibration suppression devices, wherein the blade vortex-induced vibration suppression devices and the tower wind turbine blade vortex-induced vibration suppression devices are respectively arranged in the regions from the nearest region of the blade to the tower to the region with the chord length close to the diameter of the tower, so that the pressures of the windward side and the leeward side of the wind turbine blade and the tower are balanced, smooth contour lines of the blade and the tower are damaged, the consistency of the large-size separation vortex along the height is damaged, and the shedding frequency and the ordering of the large-size separation vortex behind the blade and the tower are disturbed, thereby effectively suppressing the phenomenon of vortex-induced resonance of the large-size wind turbine blade and the tower. The invention has low cost, convenient installation and disassembly, easy use and better applicability.
Description
Technical Field
The invention relates to the wind power generation technology, in particular to a device for inhibiting vortex-induced resonance of a wind turbine, and belongs to the technical field of wind turbines.
Background
When the cylindrical structure is placed in the flow field, on one hand, positive pressure is generated on the windward side of the cylindrical structure, and negative pressure is generated on the leeward side of the cylindrical structure, so that a pressure difference is formed, and the cylindrical structure is subjected to a longitudinal force along the wind direction; on the other hand, the flow field can generate boundary layer separation on the cylindrical structure, and the wide range of boundary layer separation ensures that vortex shedding is alternately performed on two sides of the rear part of the flow field, namely vortex street phenomenon, and a periodically-changing transverse force perpendicular to the wind direction is generated on the cylindrical structure arranged in the flow field. The periodically varying transverse forces induce periodic vibration of the cylinder, which in turn alters the vortex shedding morphology of its wake, a phenomenon known as vortex induced vibration. When the vortex shedding frequency is close to the natural frequency of the cylindrical structure, the amplitude of the cylindrical structure can be obviously increased, resonance occurs, and the cylindrical structure is subjected to fatigue damage to affect the service life.
In recent years, vortex-induced resonance phenomenon of the blades and the tower occurs in the field of wind turbines, and the vortex-induced resonance phenomenon occurs in a stage of generating no electricity after the unit is hoisted, so that the unit shakes at low frequency, and the reason is that the vortex-induced vibration of the blades and the vortex-induced vibration of the tower resonate. With the increase of the capacity of the unit, the tower is higher and higher, the flexibility of the tower is increased, and the natural frequency of the whole machine is reduced. After the capacity of the unit is increased, the chord length of the blade is also increased, and the blade also generates vortex street phenomenon similar to a tower barrel. In the initial stage of installing the unit, the blades are in a feathering position, and the unit is in a power-off state at the moment and cannot be subjected to yaw and pitch control. When the unit is in a crosswind direction (the wind direction is perpendicular to the connecting line between the pneumatic center of the blade and the center of the tower), the blade and the tower simultaneously generate vortex street phenomenon. When the transverse section sizes of the blades and the tower barrel are similar, the frequencies of the separation vortex generated by the blades and the tower barrel are similar and are mutually induced to form larger vortex, and vortex-induced resonance phenomenon is generated, which affects the vortex-induced action of the single carrier (the tower barrel or the blades) far beyond. The periodic acting force generated by vortex-induced resonance is transmitted to the hub and the tower through the blades, so that the tower is subjected to large-amplitude low-frequency vibration, the reliability of the unit is seriously threatened, the aerodynamic instability of the tower can be caused, serious structural damage is generated, and even the collapse of the whole unit is caused, so that serious economic loss is caused. The unit is only fixed at the bottom of the tower, and the vortex-induced resonance phenomenon of the blades and the tower causes larger shaking of the unit. At this time, the wind turbine generator is in a stage of not generating electricity and not taking electricity from a power grid, once the vortex-induced resonance phenomenon occurs, an operator cannot adopt any effective control means for protecting the wind turbine generator, which is very dangerous for the large wind turbine generator with high price.
The utility model provides a device that suppresses wind turbine vortex-induced resonance is aimed at current situation that current wind turbine vortex-induced vibration suppression device can only restrain tower section of thick bamboo vortex-induced vibration, aims at providing one kind and solves wind turbine hoist and mount stage tower section of thick bamboo and blade vortex-induced resonance and then arouse the engineering problem that the unit low frequency rocked.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a device for inhibiting vortex-induced resonance of a wind turbine, which aims to solve the technical problem that vortex-induced phenomenon occurs simultaneously in a blade and a tower barrel when a wind turbine which does not generate electricity is in a side wind state, so that resonance is further caused, and is characterized in that a vortex-induced vibration inhibiting device is arranged on the height of the blade and the tower barrel with consistent vortex frequency, and the aim of inhibiting the vortex-induced resonance of the tower barrel and the blade in the lifting stage of the wind turbine is realized through the pressure difference between the pressure boosting of the windward side of the blade and the windward side of the tower barrel and the negative pressure of the leeward side of the wind turbine.
In order to achieve the above object, the present invention adopts the following technical scheme: the invention provides a wind turbine vortex-induced resonance suppression device, which comprises a plurality of groups of blade vortex-induced vibration suppression devices, a plurality of groups of tower vortex-induced vibration suppression devices and an elastic device controller, wherein at least three groups of blade vortex-induced vibration suppression devices are arranged on the blades at the feathering position, and at least three groups of tower vortex-induced vibration suppression devices are arranged on the tower sections consistent with the vortex frequency of the blades.
Further, each group of blade vortex-induced vibration suppression devices are arranged from the widest part of the blade to the middle part of the blade, each group of blade vortex-induced vibration suppression devices consists of a pair of blade impulse pipes, a rigid rope and an elastic device, after the rigid rope passes through the pair of blade impulse pipes and the elastic device, the pair of blade impulse pipes are fixed at the tail edge and the front edge of the blade, and two groups of blade vortex-induced vibration suppression devices arranged at the highest position and the lowest position of the feathering blade adopt the structure with the rigid rope and the elastic device; or each group of blade vortex-induced vibration suppression devices consists of a pair of blade impulse pipes and an elastic rope, the elastic rope penetrates through the pair of blade impulse pipes, the pair of blade impulse pipes are fixed at the tail edge and the front edge of the blade, and each group of blade vortex-induced vibration suppression devices arranged at the positions except the highest position and the lowest position of the feathering blade adopt the structure with the elastic rope.
Further, the blade impulse pipes of the multi-group blade vortex-induced vibration suppression device are discontinuously arranged along the blade spanwise direction, and the distance between the blade impulse pipes is 1-2 blade impulse pipe diameters.
Further, each group of tower cylinder vortex-induced vibration suppression devices consists of a pair of tower cylinder pressure guide pipes, a rigid rope elastic rope and an elastic device, after the rigid rope passes through the pair of tower cylinder pressure guide pipes and the elastic device, the pair of tower cylinder pressure guide pipes are fixed on two sides of the maximum caliber of the tower cylinder, and the two groups of tower cylinder vortex-induced vibration suppression devices arranged on the highest position and the lowest position of the tower cylinder adopt the structure with the rigid rope and the elastic device; or each group of tower cylinder vortex-induced vibration suppression devices consists of a pair of tower cylinder pressure guide pipes and elastic ropes, after the elastic ropes pass through the pair of tower cylinder pressure guide pipes, the pair of tower cylinder pressure guide pipes are fixed on two sides of the maximum caliber of the tower cylinder, and each group of tower cylinder vortex-induced vibration suppression devices arranged at the highest position and the lowest position of the tower cylinder adopt the structure with the elastic ropes.
Further, tower pressure pipes of the tower vortex-induced vibration suppression devices are discontinuously arranged along the height of the tower, and the distance between the tower pressure pipes is 1-2 tower pressure pipe diameters.
Further, each pair of tower pressure pipes and each pair of blade pressure pipes are in the same plane perpendicular to the ground.
Further, the blade impulse tube and the tower impulse tube are tubular and well fit with the shapes of the front edge, the tail edge and the tower of the blade; the ratio of the outer diameter of the blade impulse tube to the chord length of the blade at the mounting height is 0.02-0.04, and the ratio of the sum length of the blade impulse tube to the chord length of the blade at the mounting height is 0.2-0.25; the ratio of the outer diameter of the tower barrel pressure guiding pipe to the chord length of the blade at the installation height is 0.02-0.04, and the ratio of the length of the tower barrel pressure guiding pipe to the chord length of the blade at the installation height is 0.3-0.35; the wall thickness of the blade impulse tube and the tower impulse tube is 5 mm; the vane impulse lines and the tower impulse lines differ only in outer diameter and length.
Further, the diameter of the rigid rope is 2mm, the bearing capacity is strong, the waterproof and anti-skid performances are realized, and the rigid rope is used for fixing the impulse pipes positioned on the two sides of the wind turbine blade and the tower barrel and connecting and fixing vortex-induced vibration suppression devices of each group; the tightness degree of the rigid rope is adjusted by the tightness device so as to realize the installation or the disassembly of the vortex-induced vibration suppression device on the blade and the tower.
Further, the diameter of the elastic rope is 2mm, the elastic rope has good binding capacity, the surface is relatively smooth, and the elastic rope is mainly used for circumferentially fixing impulse pipes at the tail edge and the front edge of the rest wind turbine blades except the highest mounting position and the lowest mounting position and is used for circumferentially fixing impulse pipes at two sides of the rest tower barrels except the highest mounting position and the lowest mounting position.
Further, a blade vortex-induced vibration suppression device adopting the rigid rope and a tower vortex-induced vibration suppression device adopting the rigid rope are arranged on the leeward surfaces of the blade and the tower, and the tightness device is used for controlling the tightness degree of the rigid rope. The take-up device is controlled by a take-up device controller.
Further, the tensioner controller is configured to remotely control the tensioner.
The invention adopts the technical scheme and has the following beneficial effects:
(1) According to the invention, a plurality of groups of pressure guide pipes are respectively arranged at the tail edge, the front edge and the two sides of the tower drum of the wind turbine blade along the height direction, and the intensity of the vibration power source of the blade and the tower drum along the wind direction is reduced through the pressure difference between the pressure boosting of the windward side and the negative pressure of the leeward side of the wind turbine blade and the tower drum.
(2) In the height direction, the impulse pipes are discontinuously distributed at the tail edge and the front edge of the blade and are discontinuously distributed at the two sides of the tower barrel, so that the blade and the two sides of the tower barrel are macroscopically distributed in a concave-convex mode, the surface shapes of the blade and the tower barrel are changed, the formation of large vortices of the wake flow rules of the blade and the tower barrel is reduced, and the structures of the vortices are destroyed.
(3) The advantage of the macroscopically concave-convex boundary contours on two sides is that the convex part also generates fine broken vortex, and the broken vortex interferes with the large vortex which falls off from the rear of the blade and the tower barrel, and the structure, frequency and regularity of the original large vortex are destroyed along the height, so that the wake flow swinging leftwards and rightwards is effectively restrained.
(4) The invention has low cost, convenient installation and disassembly, easy use and better applicability.
Drawings
FIG. 1 is a schematic view of the installation position and structure of the vortex resonance suppression device for wind turbines.
FIG. 2 is a schematic cross-sectional view of a set of blade vortex-induced vibration suppression devices.
FIG. 3 is a schematic illustration of boundary layer separation points and surface pressure of a wind turbine blade prior to installation of the vortex-induced vibration suppression device of the present invention.
FIG. 4 is a schematic illustration of boundary layer separation points and surface pressure of a wind turbine blade after installation of the vortex-induced vibration suppression device of the present invention.
Fig. 5 is a schematic view of the principle of the small-sized scroll of the vane impulse tube of the present invention.
FIG. 6 is a schematic cross-sectional view of a set of tower vortex-induced vibration suppression devices.
FIG. 7 is a schematic illustration of the boundary layer separation point and surface pressure of a wind turbine tower prior to installation of the tower vortex-induced vibration suppression device of the present invention.
FIG. 8 is a schematic diagram of the boundary layer separation point and surface pressure of a wind turbine tower after installation of the tower vortex-induced vibration suppression device of the present invention.
FIG. 9 is a schematic illustration of each pair of tower pressure tubes in the same plane perpendicular to the ground as each pair of blade pressure tubes.
The figure indicates: 1. wind turbine blades, a blade vortex-induced vibration suppression device, a wind turbine tower, a tower drum vortex-induced vibration suppression device, a blade impulse pipe, a tower drum impulse pipe, a rigid rope, an elastic device, a spring rope and an elastic rope, wherein the wind turbine blades, the blade vortex-induced vibration suppression device, the wind turbine tower, the tower drum vortex-induced vibration suppression device, the blade impulse pipe, the tower drum impulse pipe, the rigid rope, the elastic device and the spring rope are respectively arranged in sequence, and the spring rope is arranged in sequence.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1, a wind turbine vortex-induced resonance suppression device comprises a plurality of groups of blade vortex-induced vibration suppression devices 2 and a plurality of groups of tower vortex-induced vibration suppression devices 4, wherein the plurality of groups of blade vortex-induced vibration suppression devices 2 are arranged on a wind turbine blade 1 at a feathering position, the plurality of groups of tower vortex-induced vibration suppression devices 4 are arranged on a wind turbine tower 3, each group of tower vortex-induced vibration suppression devices are arranged on a tower section nearest to the wind turbine blade at the feathering position, namely, each group of blade vortex-induced vibration suppression devices and each group of tower vortex-induced vibration suppression devices are arranged in a region with a close interval between the blades and the tower or in a region with a chord length approximately equal to the diameter of the tower under the same height section, each group of blade vortex-induced vibration suppression devices are connected into a whole through rigid ropes, and each group of tower vortex-induced vibration suppression devices are connected into a whole through rigid ropes. In the region of the tower and the blades, the chord length of the blades is the largest, the fluid passing through the gap between the tower and the blades is less and the flow velocity is slower, the tower barrel and the blades can be approximately regarded as a whole, the separation vortex generated at the outer sides of the tower barrel and the blades are mutually induced, then the vortex combination phenomenon can occur, the single vortex shedding form can be finally presented, the periodic transverse force of the tower barrel and the blades is increased, and the resonance phenomenon is formed. When the chord length of the tower barrel is similar to the diameter of the tower barrel at the position where the distance between the tower barrel and the blades is increased, the Reynolds numbers of the tower barrel and the tower barrel are similar, the shedding frequency and the phase angle of the vortex in wake flow are similar, and the vortex formation is mutually induced, so that larger vortex can be generated to cause resonance.
As shown in fig. 1 and 2, the blade vortex-induced vibration suppression device installed at the highest position or the lowest position includes: the device comprises a pair of blade impulse pipes 5, a rigid rope 7 and an elastic device 8, wherein the rigid rope 7 passes through the pair of blade impulse pipes 5 and the elastic device 8, then the pair of blade impulse pipes 5 are respectively fixed at the tail edge and the front edge of the wind turbine blade 1, and the elastic device is fixed on the leeward surface of the wind turbine blade 1; the blade vortex-induced vibration suppression device installed at other height positions comprises: a pair of blade impulse pipes 5 and an elastic rope 10, wherein the elastic rope 10 passes through the pair of blade impulse pipes 5, and then the pair of blade impulse pipes 5 are respectively fixed at the tail edge and the front edge of the wind turbine blade 1. As shown in FIG. 3, when the blade positively blows the blade surface, the air flow collected on the windward side is positive pressure, and the air shortage on the leeward side is negative pressure. As shown in fig. 4, after the pressure guide pipe is additionally arranged, part of air flow enters the leeward surface with air deficiency from two sides under the guidance of the pressure guide pipe, so that the positive pressure of the positive pressure surface can be reduced, the negative pressure of the leeward surface can be reduced, and the pressure difference between the front and rear sides of the blade can be reduced.
As shown in FIG. 5, the vane impulse pipes are discontinuously added with a plurality of groups along the direction of the vane span, and each group of impulse pipes can guide the high-pressure air flow of the positive pressure surface to the leeward surface for air supplementing, so that the effect of reducing the pressure difference at two sides of the vane from a plurality of areas in height is achieved.
As shown in fig. 5, the multiple sets of non-continuous impulse pipes disrupt the smooth contours on both sides of the blade. On one hand, the convex part can destroy smooth airflow, and the generated separation vortex does not have the consistency of wake vortices of smooth blades; on the other hand, the raised part produces disturbance to the surface airflow to form high frequency small size vortex and to induce and destroy the small frequency large vortex of the smooth blade.
As shown in fig. 1 and 6, the tower vortex-induced vibration suppression device installed at the highest position or the lowest position includes: the device comprises a pair of tower pressure pipes 6, a rigid rope 7 and an elastic device 8, wherein the rigid rope passes through the pair of tower pressure pipes 6 and the elastic device 8, the pair of tower pressure pipes 6 are fixed on two sides of the maximum caliber of the wind turbine tower, and the elastic device 8 is fixed on the lee surface of the wind turbine tower; the tower vortex-induced vibration suppression device installed at other height positions comprises: the pair of tower pressure pipes 6 and the elastic rope 10 respectively fix the pair of tower pressure pipes 6 at two ends of the maximum caliber of the wind turbine tower after the elastic rope 10 passes through the pair of tower pressure pipes 6. As shown in fig. 7, the pressure difference between the windward side and the leeward side of the smooth tower is excessive, which causes the front-to-back swing. As shown in FIG. 8, after a plurality of groups of vortex-induced vibration suppression devices are additionally arranged, the pressure guide pipe can guide high-pressure air on the windward side to low-pressure positions on the leeward side from two sides, so that the front-rear pressure difference is reduced. In the height direction, the plurality of groups of discontinuous impulse pipes break the smooth contour lines on the two sides of the tower. On one hand, the convex part can destroy smooth airflow, and the generated separation vortex has no consistency; on the other hand, the raised part generates high-frequency small-size vortex, and induces and damages the original low-frequency large vortex of the slide tower.
As shown in fig. 1, according to the aerodynamic principle of resonance generated by blade vortex-induced vibration and tower vortex-induced vibration, each vortex-induced vibration suppression device is arranged in a region where the distance between the blade and the tower is similar, and also covers a region where the blade size and the tower diameter are similar. Eliminating both vortex-induced resonance phenomena from multiple regions.
As shown in fig. 2 and 4, at the height position where the wind turbine blade 1 and the wind turbine tower 3 are closest to each other, a pair of blade impulse pipes 5 are fixed at the leading edge and the trailing edge of the wind turbine blade 1 by a rigid rope 7, and the extension lines of the connection lines of the leading edge and the trailing edge pass through the center of the tower, and a pair of tower impulse pipes 6 are fixed at both sides of the wind turbine tower 3 by the rigid rope 7 and are in line with the extension lines of the connection lines of the leading edge and the trailing edge of the blade. The elastic device 8 is positioned on the leeward surface of the wind turbine blade 1 and the tower 3, and two ends of the elastic device are connected with the rigid ropes 7 for adjusting the tightness of the rigid ropes 7. The elastic device controller can remotely control the elastic device 8 to loosen the rigid rope 7 so as to facilitate the installation and the disassembly of the whole device.
In a similar manner, a plurality of groups of vortex-induced vibration suppression devices 2 and a plurality of groups of tower vortex-induced vibration suppression devices 4 are installed at the height positions where the wind turbine blades 1 and the towers 3 are liable to generate the consistent vortex frequencies, as shown in fig. 1.
Vortex-induced vibration suppression devices positioned at the upper and lower extreme ends of the tower barrel and the blades are combined by using a rigid rope 7 and an elastic device 8, and the rest are independently used by using an elastic rope 10. In addition, the rigid ropes 7 are used for connecting the devices into a whole, and the whole set of devices is fixed at a designated area of the blade (tower), so that the whole set of devices cannot generate position movement due to gravity or strong wind action, and the action efficiency is reduced. Compared with each group of independent installation, the integrated design of the vortex-induced vibration suppression devices is more beneficial to the installation and the disassembly of the devices.
As shown in fig. 1, the method for installing the multi-group blade vortex-induced vibration suppression device 2 on the wind turbine blade 1 comprises the following steps: a pair of blade impulse pipes 2 are arranged at the front edge and the rear edge of the wind turbine blade 1 in the crosswind direction, and a loosening and tightening device 8 is arranged on the leeward surface of the wind turbine blade 1; one end of the rigid rope 7 is fixed on the elastic device 8, and the other end of the rigid rope passes through the blade impulse pipes 5 on two sides of the wind turbine blade 1 and then is connected to the elastic device 8, and the elastic device 8 tightens the rigid rope 7 to fix the blade impulse pipes 5 on the wind turbine blade 1.
The tower vortex-induced vibration suppression device is installed in a similar manner to the blade vortex-induced vibration suppression device, with each pair of tower impulse pipes and each pair of blade impulse pipes being in the same plane perpendicular to the ground, as shown in fig. 9.
As shown in fig. 1 and 2, when the wind turbine is powered on, the wind turbine can normally yaw and pitch, and the blade vortex-induced vibration suppression device 2 needs to be detached from the wind turbine blade 1, the elastic device controller remotely controls the elastic device 8 to loosen the rigid rope 7, and under the action of gravity, the blade impulse tube 5, the elastic device 8, the rigid rope 7 and the elastic rope 10 fall to the ground along the wind turbine blade 1 to complete detachment.
Similarly, as shown in FIGS. 1 and 6, when the wind turbine is connected to the net, and can yaw and pitch normally, the tower vortex-induced vibration suppression device 4 needs to be detached from the wind turbine tower 3, the elastic device controller remotely controls the elastic device 8 to loosen the rigid ropes 7. The tower pressure guide pipe 6, the elastic device 8 and the rigid rope 7 fall off to the ground along the wind turbine tower 3 under the action of gravity.
Under the condition of a certain wind speed and no installation of the suppression device, the wind turbine blade and the wind turbine tower barrel can generate large-range boundary layer separation within a certain height range so as to generate alternate vortex shedding at two sides behind the wind turbine blade and the wind turbine tower barrel. Because the distance between the blade and the tower is relatively short, vortex shedding at the rear of the wind turbine blade can affect the wind turbine tower, and vortex shedding at the rear of the wind turbine tower can also affect the wind turbine blade. When the frequencies of vortex shedding behind the wind turbine blade or the wind turbine tower are consistent, the two vortices can induce to form larger vortices, vortex-induced resonance is formed, and the influence on the blade and the tower is increased. When the frequency of the large vortex is close to the natural frequency of the wind turbine blade or wind turbine tower, the wind turbine tower amplitude is further increased.
The present invention is based on aerodynamic principles and the solution to these problems is to install paired impulse pipes on both sides of the blades and tower perpendicular to the wind direction. The principle is as follows:
(1) The pressure difference between the windward side and the leeward side is reduced, the longitudinal load borne by the blades and the tower barrel is reduced, and the specific principle is that: the incoming wind blown from the front is guided by the pressure guide pipe to be quickly guided to the leeward surface, so that the pressure is relatively balanced, the pressure of the whole wind turbine structure facing the incoming wind is reduced, the wind resistance of the wind turbine can be obviously improved, and the service life of the wind turbine is prolonged.
(2) The uniform vortex formed by breaking the smooth profile (in the height direction) of the blade and the tower is irregular and broken, and the specific principle is that: the installation of the impulse pipe is utilized, so that irregular shapes are formed on two sides of the blade segment and the tower section, the surface flow of the smooth wind turbine blade and the wind turbine tower is damaged, vortex generation and release are disturbed, the vortex with stable frequency is difficult to form at the rear of the impulse pipe, and the possibility of vortex-induced resonance of the wind turbine blade and the wind turbine tower is greatly reduced.
(3) The small-size vortex is utilized to induce and destroy the large-size separation vortex formed by the blades and the tower, and the specific principle is as follows: the outer contour of the intermittently arranged guide tube bulges can produce a plurality of small-size vortexes, and the vortexes have higher strength and higher shedding frequency. The small-size vortex can induce the large-size separation vortex formed by the falling of the blades and the tower, and the consistency and the order of the large-size separation vortex in the height direction are damaged.
Claims (8)
1. An apparatus for suppressing vortex-induced resonance in a wind turbine, comprising: at least three groups of blade vortex-induced vibration suppression devices and at least three groups of tower cylinder vortex-induced vibration suppression devices, wherein the blade vortex-induced vibration suppression devices are arranged on blades at the feathering position, and the tower cylinder vortex-induced vibration suppression devices are arranged on tower cylinder sections consistent with the blade vortex frequency at the feathering position; the tower section consistent with the vortex frequency of the blade at the feathering position is as follows: a tower region closely spaced from the blades, or a tower region having a diameter approximately equal to the chord length of the blades at the same height section;
the blade vortex-induced vibration suppression device mounted at the highest position or the lowest position includes: the pair of blade pressure pipes, the rigid rope and the elastic device are arranged in a sleeved mode, wherein the rigid rope penetrates through the pair of blade pressure pipes and the elastic device to form an annular structure, the pair of blade pressure pipes are respectively sleeved on the front edge and the tail edge of a blade, and the elastic device is sleeved on the lee surface of the blade.
2. A device for suppressing vortex-induced resonance in a wind turbine according to claim 1, wherein the blade vortex-induced vibration suppressing means installed at a height other than the highest position or the lowest position comprises: the elastic rope penetrates through the pair of blade pressure guide pipes to form an annular structure, and the annular structure hoops the pair of blade pressure guide pipes on the front edge and the tail edge of the blade respectively.
3. A device for suppressing the vortex-induced resonance of a wind turbine according to any one of claims 1 to 2, wherein the tower vortex-induced vibration suppressing device installed at the highest position or the lowest position comprises: the device comprises a pair of tower tube pressure guide pipes, a rigid rope and an elastic device, wherein the rigid rope passes through the pair of tower tube pressure guide pipes and the elastic device to form an annular structure, the annular structure hoops the pair of tower tube pressure guide pipes on two sides of the maximum caliber of the tower tube respectively, and hoops the elastic device on the lee surface of the tower tube.
4. A device for suppressing the vortex-induced resonance of a wind turbine according to any one of claims 1 to 2, wherein the tower vortex-induced vibration suppressing device installed at a height other than the highest position or the lowest position comprises: the elastic rope penetrates through the pair of tower tube pressure guide pipes to form an annular structure, and the pair of tower tube pressure guide pipes are respectively hooped on two sides of the maximum caliber of the tower tube by the annular structure.
5. The device for inhibiting vortex-induced resonance of a wind turbine according to claim 1 or 2, wherein the ratio of the outer diameter of the blade impulse tube to the chord length of the blade at the installation height is 0.02-0.04, the ratio of the sum length of the blade impulse tube to the chord length of the blade at the installation height is 0.2-0.25, and the blade impulse tubes of each group of blade vortex-induced vibration inhibiting devices are discontinuously arranged along the span direction of the blade, and the distance is 1-2 blade impulse tube diameters.
6. The device for suppressing vortex-induced resonance of a wind turbine according to claim 3, wherein the ratio of the outer diameter of the tower pressure guiding tube to the chord length of the blade at the installation height is 0.02-0.04, the ratio of the length of the tower pressure guiding tube to the chord length of the blade at the installation height is 0.3-0.35, the tower pressure guiding tubes of each group of tower vortex-induced vibration suppression devices are discontinuously arranged along the tower height, and the distance is 1-2 tower pressure guiding tube diameters.
7. The device for suppressing vortex-induced resonance in a wind turbine according to claim 4 wherein each pair of tower pressure tubes is in the same plane perpendicular to the ground as each pair of blade pressure tubes.
8. The device for suppressing vortex-induced resonance of a wind turbine according to claim 1, wherein the vortex-induced vibration suppressing devices of each group of blades are connected as a whole by a rigid rope, and the vortex-induced vibration suppressing devices of each group of towers are connected as a whole by a rigid rope.
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| CN114687956A (en) * | 2022-03-23 | 2022-07-01 | 国电联合动力技术有限公司 | Method and device for checking vortex-induced vibration of blade |
| CN115342033A (en) * | 2022-07-13 | 2022-11-15 | 中国海洋大学 | Wake flow detection method and system based on blade clearance and wind wheel rotating speed |
| CN115217711A (en) * | 2022-08-19 | 2022-10-21 | 南京航空航天大学 | Flexible suppression device for vortex-induced vibration of wind power blade |
| CN116696664A (en) * | 2023-06-07 | 2023-09-05 | 长沙理工大学 | Intelligent air bag vortex vibration control system and method for fan tower barrel |
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| CN102686877A (en) * | 2009-12-02 | 2012-09-19 | 维斯塔斯风力系统集团公司 | Anti-oscillation apparatus and technique for securing wind turbine blades against oscillations |
| CN209228541U (en) * | 2018-12-14 | 2019-08-09 | 上海电气风电集团有限公司 | Reduce the structure of blower fan tower barrel vortex-induced vibration |
| CN213270154U (en) * | 2020-10-27 | 2021-05-25 | 内蒙古工业大学 | Vortex-induced vibration damper installed on horizontal shaft wind turbine tower |
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| CN102686877A (en) * | 2009-12-02 | 2012-09-19 | 维斯塔斯风力系统集团公司 | Anti-oscillation apparatus and technique for securing wind turbine blades against oscillations |
| CN209228541U (en) * | 2018-12-14 | 2019-08-09 | 上海电气风电集团有限公司 | Reduce the structure of blower fan tower barrel vortex-induced vibration |
| CN213270154U (en) * | 2020-10-27 | 2021-05-25 | 内蒙古工业大学 | Vortex-induced vibration damper installed on horizontal shaft wind turbine tower |
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