WO2019047537A1 - 外表面具有抑制涡激振动功能的围护结构 - Google Patents
外表面具有抑制涡激振动功能的围护结构 Download PDFInfo
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- WO2019047537A1 WO2019047537A1 PCT/CN2018/084197 CN2018084197W WO2019047537A1 WO 2019047537 A1 WO2019047537 A1 WO 2019047537A1 CN 2018084197 W CN2018084197 W CN 2018084197W WO 2019047537 A1 WO2019047537 A1 WO 2019047537A1
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- vortex
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- annular
- annular groove
- flow
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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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
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
-
- 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
- F15D1/14—Diverting flow into alternative channels
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
- E04H12/342—Arrangements for stacking tower sections on top of each other
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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
- F05B2240/00—Components
- F05B2240/10—Stators
- F05B2240/12—Fluid guiding means, e.g. vanes
- F05B2240/122—Vortex generators, turbulators, or the like, for mixing
-
- 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
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/91—Mounting on supporting structures or systems on a stationary structure
- F05B2240/912—Mounting on supporting structures or systems on a stationary structure on a tower
-
- 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
-
- 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
- F05B2260/964—Preventing, counteracting or reducing vibration or noise by damping means
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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
-
- 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
- Y02E10/728—Onshore wind turbines
Definitions
- the invention relates to the technical field of enclosure structures, in particular to an enclosure structure having an outer surface having a function of suppressing vortex-induced vibration.
- Figure 1-1 shows the structure of wind power equipment.
- the foundation of the wind power generation equipment is the tower 10, which plays a role of supporting the whole machine and plays a supporting role.
- the tower 10 may be a steel cylinder or a steel cylinder and A combination of concrete towers.
- the tower 10 carries a nacelle 30 of a wind power plant, a generator, and an impeller 20.
- the wind turbine including the impeller 20 and the generator completes the task of acquiring wind energy and converting it into electrical energy.
- the converted electrical energy is transmitted through the power transmission cable 40 or the power transmission busbar.
- the power transmission cable 40 shown in the figure is taken out from the nacelle 30 and then limited by the cable retaining ring at the top of the tower 10, and the cable retaining ring is fixed to the cable retaining ring.
- the fixed plate 50 is then suspended along the inner wall of the tower 100 through the saddle face bracket 60 to the converter cabinet 70.
- a tower door 80 is also provided at the lower end of the tower 10.
- the converted electric energy is controlled by the switchgear of the wind power generator, and is transported to the converter (in the converter cabinet 70) for completing the electric power conversion task by means of the power transmission cable 40 or the power transmission busbar wire, and then passed through the converter. After processing, the electrical energy required to meet the grid connection rules can be obtained. Therefore, the tower 10 of the wind power generation equipment can be said to be the tower of the wind power generator, and mainly plays a supporting role in the wind power generator equipment.
- the tower 10 carries the structural wind load generated by the nacelle 30, the impeller 20, the generator or the downwind vibration and the crosswind direction vibration caused by the wind, that is, the wind-induced structural vibration problem.
- Figure 1-2 is a schematic diagram of tower tower hoisting.
- the tower 10 is currently installed in sections, as shown in FIG. 1-2.
- the first tower section 11 is first installed on the foundation foundation 90 of the tower 10, and then the other tower sections are hoisted one by one, after being connected to each other, the top of the tower 10 (Fig. 1 -
- the fifth tower section 15) of 2 is connected to the yaw system of the nacelle 30, the nacelle 30 is docked with the generator, and the generator (or gearbox) is then docked with the impeller 20.
- the base ring of the foundation foundation 90 connected to the first tower section 11 is cleaned, and the threads of the plurality of bolts (such as 120) are smeared and placed at the inner ring of the base ring, and the wind power is generated at the same time.
- the equipped control cabinet is hoisted into the base ring;
- the bolt is threaded from the bottom to the top, and the nut is tightened with an electric wrench, and at least the nut is tightened three times (after the completion of the lifting process of the entire wind power generation equipment) Then, use a torque wrench to tighten the tower connecting nut to the required torque value);
- the remaining tower section is the same as the hoisting process of the first tower section 11. After the uppermost tower section is hoisted, the hoisting cabin is prepared.
- the above-mentioned docking and connection installation processes are carried out under the condition that the local wind in the small-area environment of the wind farm is unpredictable. Therefore, during the hoisting installation process, gusts or constant small winds of varying sizes are often encountered. As mentioned above, these gusts or continuous winds may induce vibrations to the tower, destroying the stability of the enclosure and endangering the person and the scene. The safety of the equipment, delay the installation schedule. For example, after the fourth tower section 14 is hoisted, the fourth tower section 14 is vibrated, causing the fifth tower section 15 to be out of alignment; even the bolts that are tightened may break under shock, thereby jeopardizing safety.
- the safety requirements for the hoisting process of the wind power industry clearly stipulate that the hoisting of the blade group is prohibited when the wind speed is greater than 6 m/s; the hoisting of the engine room is strictly prohibited when the wind speed is greater than 8 m/s; the hoisting of the tower is strictly prohibited when the wind speed is greater than 10 m/s. It can be seen that the on-site lifting schedule and installation schedule are obviously limited by the local wind conditions. For the construction of high-altitude and high-altitude wind farms, the construction period is more susceptible.
- FIG. 2 is a schematic view showing the structure of a tower tube having a certain vibration suppression function in the prior art
- FIG. 3-1 to FIG. 3-6 are cylindrical vortex shedding (flow around the body) and Renault respectively.
- a schematic diagram of the relationship between the six intervals, the six intervals of the Reynolds number (Re) are from FIG. 3-1 to FIG. 3-6, respectively, Re ⁇ 5, 5 ⁇ Re ⁇ 40, 40 ⁇ Re ⁇ 150, 150 ⁇ Re ⁇ 3 ⁇ 10 5 , 3 ⁇ 10 5 ⁇ Re ⁇ 3 ⁇ 10 6 , Re > 3 ⁇ 10 6 .
- the structure is divided into a bluff body and a streamline like a wing or a sail of an aircraft.
- the cylinder wake is mainly characterized by turbulent wake after separation.
- the vortex shedding starts irregularly.
- the period of vortex frequency can be roughly determined, but vortex
- the interference force will no longer be symmetrical, but random.
- the wake behind the cylinder is very disordered, but it shows a regular vortex shedding.
- the vortex frequency is equal to the natural frequency of the tower and its basic vibration system of the structural system, which can be satisfied at a certain wind speed, but the natural frequency tower and its basic vibration system will have some feedback effect on the vortex shedding. So that the frequency of the vortex is “captured” by the vibration frequency of the tower and its basic vibration system within a certain wind speed range, so that it does not change with the wind speed within this wind speed range. This phenomenon is called Locking, locking will expand the wind speed range in which the tower structure is subject to vortex resonance.
- the tower height of modern large-scale MW-class wind turbines can reach 60-100m.
- the top of tower 10 is equipped with main components such as main frame, sub-frame, hub and blades (ie impeller 20).
- main components such as main frame, sub-frame, hub and blades (ie impeller 20).
- impeller 20 When the wind turbine is running, the load received by the tower 10 is affected by the natural wind, in addition to the gravity generated by the top part and the dynamic load generated by the rotation of the wind wheel, including the windward direction and the crosswind direction.
- the impeller When the wind blows the impeller, it generates bending moments and forces to the tower. This bending moment and force generated by the downwind direction is the main cause of the tower 10 being damaged.
- the eddy current generated when the wind bypasses the tower 10 also causes lateral vibration that causes the tower 10 to undergo resonance damage.
- the right and left sides of the wake produce pairs of oppositely-arranged and oppositely-rotating anti-symmetric vortices, namely the Karman vortex.
- the vortex exits the tower 10 at a certain frequency, causing the tower 10 to vibrate laterally perpendicular to the wind direction, also referred to as wind induced lateral vibration, ie, vortex induced vibration.
- wind induced lateral vibration ie, vortex induced vibration.
- a spiral 10a (or a spiral plate) is wound around the outer wall of the tower 10 for suppressing vortex shedding occurring on the surface of the tower 10.
- the spiral 10a (or spiral plate) has different lateral oscillation suppression effects when arranged at different pitches; the height increase of the spiral 10a is beneficial to destroy the vortex release period, and the vortex generation and distribution are more irregular, which is favorable for suppressing the vortex Vibration, while the noise, the resistance generated before and after the tower is gradually increased, and the amplitude of the pitch vibration along the wind direction will increase.
- the coverage of the spiral 10a (or spiral plate) on the surface of the tower affects the lateral oscillation suppression effect.
- the coverage reaches (or exceeds) 50%, the effect of suppressing lateral vibration is better, but at this time the spiral 10a (or The severe effects of wind-induced noise from the air flow on the natural environment are not allowed by ecological regulations; based on this, even if the spiral 10a (or spiral plate) is installed, it is only used in the hoisting phase, and long-term operation cannot be considered.
- the present invention provides an enclosure structure having an outer surface having a function of suppressing vortex-induced vibration, which can suppress vortex-induced vibration, thereby improving a situation in which the enclosure structure is restricted by wind conditions during installation, and Vortex-induced vibration can also be continuously suppressed after installation.
- An embodiment of the present invention provides an enclosure structure having an outer surface having a function of suppressing vortex-induced vibration, wherein an outer surface of the enclosure structure is provided with a plurality of annular grooves surrounding the enclosure structure, so that the enclosure structure is external Forming an annular groove and an annular boss on the surface;
- the outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed along the circumferential direction of the annular boss; the air guiding groove is inclined upward or downward, and the flow direction is A portion of the upwind flow of the annular boss is introduced into the annular groove adjacent the annular boss.
- the enclosure structure of the invention has a convex and concave outer surface, and an air guiding groove is arranged on the annular boss, and the technical effect and mechanism are as follows:
- a convex and concave outer surface is disposed on the outer surface of the tower, and the outer surface can be used to intervene in the natural air flow field, and the original upwind direction around the tower in the prior art is changed to form a flow around the tower.
- the boundary layer changes the flow field around the flow tower in the upwind direction, breaks the correlation between the flow and the flow state of the boundary layer, prevents the consistency of the pulsation pressure, and fundamentally prevents the cause of the vortex-induced vibration, that is, prevents the leeward behind the tower.
- the arrangement of the induced draft groove enables the flow of the upwind of the flow around the annular boss to be consumed, and the wind direction is deflected and blown into the annular groove, and invades at a certain oblique angle to achieve the function of gathering pressure and disorder, further breaking the ring shape.
- the boundary layer flow of the boss and the annular groove, the correlation of the flow state, the consistency of the pulsation, and the suppression of the vortex-induced vibration is to say, in the case where the outer surface of the air guiding groove and the convex-concave phase are combined, the tower section of the convex-concave outer surface is provided, and the boundary layer of the entire laminar flow is reliably broken, thereby suppressing the vortex-induced vibration.
- the tower of the present invention is provided with a convex-concave outer surface and an air guiding groove.
- the main mechanism for suppressing the vortex-induced vibration is to break the boundary layer and to eliminate the vortex-induced causes fundamentally, so that the depth of the annular groove is small. It does not affect the strength of the outer surface of the tower, and the noise is low. It can meet environmental standards, so it can be used not only in the installation stage, but also in the long-term after installation.
- the annular groove has a depth of 2-5 mm, is easy to manufacture, and can meet the requirement of breaking the boundary layer which is generally only 1-2 mm thick, and at the same time, the depth can prevent the mold from filling the annular groove in a humid environment.
- the present scheme starts from the cause of the vortex-induced vibration caused by the flow-off body, and the vortex-induced vibration suppressing effect is better, and no other vibration is induced.
- the boundary layer on the outer surface of the tower can be turbulent in advance.
- the air guiding groove changes the airflow direction and invades the annular groove at a certain oblique angle, or inhales under the upward wind direction to accelerate the mixing into the boundary layer corresponding to the annular boss, which is to destroy the laminar flow of the original boundary layer.
- the characteristic is that the turbulent flow occurs in advance, thereby suppressing the flow backflow around the reverse pressure gradient, suppressing or preventing the boundary layer from separating the outer surface of the tower, so that the partial or all passages of the tower are smaller than the aerodynamic coefficient C of the flow around the flow. .
- the amplitude of the vibration can be reduced to achieve the purpose of suppressing vibration.
- the inventor's research found that when the tower draws energy from the same vortex as its own frequency, the structural vibration shape of the upper part of the tower will change, and the changed tower envelope structure will have an effect on the airflow.
- the energy concentrated on the fundamental frequency of the tower structure is getting larger and larger, which stimulates the vortex-induced resonance of the tower structure.
- the outer surface of the tower is convex and concave, which interferes with the upward wind flow, and the air guiding groove also forms an upward and downward angle of attack on the outer surface of the annular boss (ie, changes the local aerodynamic shape), thereby making the wind up.
- the flow has a certain turbulence intensity.
- the upwind flow has a certain turbulence intensity
- the upwind has already carried various energy vortices, and has energy of various frequency components. These energy dispersions are large and pulsating.
- the outer surface of the cylinder is used, the integration of the outer surface structure of the tower on the upwind flow occurs on the basis of the vortex in the upwind flow. It is not easy to objectively transform it into a vortex with the same fundamental frequency of the tower vibration on the basis of the chaotic upwind flow. Therefore, the interference of the convex and concave surface and the induced draft groove suppresses the vortex induced vibration.
- Figure 1-1 is a schematic diagram of the structure of wind power generation equipment
- Figure 1-2 is a schematic view of the tower section hoisting
- FIG. 2 is a schematic view showing the structure of a tower having a certain vibration suppression function
- Figures 3-1 to 3-6 are schematic diagrams showing the relationship between cylindrical vortex shedding (flow around the body) and Reynolds number;
- FIG. 4 is a schematic structural view of a first embodiment of a retaining structure provided by the present invention.
- Figure 5 is a partial plan view showing the outer surface of Figure 4.
- Figure 6 is a schematic view of four adjacent air guiding grooves on the annular boss of Figure 4.
- Figure 7 is a schematic diagram showing the relationship between the Storocha number of the outer surface of the tower and the Reynolds number
- Figure 8 is a partial schematic view showing the position of the air outlets of the upper and lower air guiding grooves of the annular groove of Figure 6;
- Figure 9 is a schematic view showing the structure of a second embodiment of the outer surface of the outer surface of the tower.
- Figure 10 is a partial schematic view showing the position of the air outlets of the upper and lower air guiding grooves of the annular groove of Figure 9 being displaced;
- Figure 11 is a schematic view showing the structure of the annular groove of the outer surface of the tower in a wave shape
- Figure 12 is a schematic view showing a structure in which a turbulent projection is provided in an annular groove
- Figure 13 is a schematic structural view of the turbulent projection of Figure 12;
- Figure 14 is a schematic view showing different structures of the annular groove on the outer surface of the tower;
- Figure 15 is a schematic view showing the comparison of the width of the annular groove on the outer surface of the tower and the height of the annular boss;
- Figure 16 is a schematic view of a tower with a vibration monitoring device on the inner wall.
- FIG. 4 is a schematic structural view of a first embodiment of a retaining structure according to the present invention
- FIG. 5 is a partial plan view showing the outer surface of FIG. 4, for the convenience of viewing and understanding, the left side of FIG. 100 is a front view, the right side of FIG. 5 is a schematic view of the outer surface of the tower 100, and FIGS. 8, 10, 11, and 14 are also shown in the same manner
- FIG. 6 is four adjacent sluice grooves on the annular boss of FIG. Schematic diagram of the trough.
- the enclosure structure is specifically the tower 100 of the wind turbine generator.
- the following is also exemplified by the example.
- the top of the tower cylinder 100 is provided with a nacelle 200, the nacelle 200 is connected to a generator, a hub, the hub is connected to the blade 300, and the bottom of the tower 100 is Connected to the tower base 400.
- the outer surface of the tower 100 is provided with a plurality of annular grooves 101 surrounding the tower 100.
- the outer surface of the tower 100 is formed with a plurality of annular grooves 101 and annular bosses 102 which are arranged between the concave and convex portions.
- the outer surface of the annular boss 102 is provided with a plurality of air guiding grooves 102a, and the plurality of air guiding grooves 102a are distributed along the circumferential direction of the annular boss 102, that is, distributed along the circumferential direction of the tower 100.
- the air guiding groove 102a provided on the annular boss 102 is inclined upward or downward and communicates with the annular groove 101. Then, the flow to the upwind direction of the annular boss 102 is partially flowed into the air guide groove 102a to form an air flow which is deflected upward or downward in the wind direction, and is introduced into the adjacent annular groove 101.
- the second row of annular grooves 101 is taken as an example, and the upper and lower adjacent annular bosses 102 are adjacent to a row of the air guiding grooves 102a of the annular groove 101 (the annular boss 102 is annular).
- the air guiding groove 102a which is also distributed along the circumferential direction, forms a "row" after being unfolded, and a part of the upward wind flow around the annular annular boss 102 is introduced into the annular groove 101, that is, the annular groove 101 is up and down. There is airflow.
- FIG. 5 the second row of annular grooves 101 is taken as an example, and the upper and lower adjacent annular bosses 102 are adjacent to a row of the air guiding grooves 102a of the annular groove 101 (the annular boss 102 is annular).
- the air guiding groove 102a which is also distributed along the circumferential direction, forms a "row" after being unfolded, and a part of the upward wind flow around the annular annular boss
- the air guiding groove 102a when there is a large amount of airflow in the annular groove 101, the air guiding groove 102a will suck a part of the airflow from the annular groove 101 under the upward wind direction, and the four directions in FIG.
- the two air guiding grooves 102a on the right side of the air groove 102a are sucked from the corresponding annular groove 101, and the extracted air flow is accelerated to be mixed into the boundary layer of the outer surface of the annular boss 102.
- a convex and concave outer surface is disposed on the outer surface of the tower 100, and the outer surface is used to intervene in the natural air flow field, and the original upwind flow around the tower 100 in the prior art is changed to the tower 100.
- the boundary layer formed by the flow changes the flow field around the flow tower 100, and breaks the correlation between the flow and the flow state of the boundary layer, prevents the consistency of the pulsation pressure, and fundamentally prevents the cause of the vortex-induced vibration, that is, blocks
- the occurrence of the Karman vortex phenomenon on both sides of the leeward side behind the tower 100 prevents the vortex response of the tower 100 and the amplification of the vortex response, and suppresses the tower 100 from being induced to vibrate.
- the arrangement of the air guiding groove 102a is such that the kinetic energy of the upward wind flow around the annular boss 102 is consumed, and the wind direction is deviated and then blown into the annular groove 101, and invades at a certain oblique angle to achieve agglomeration and disorder.
- the function further breaks the boundary layer flow of the annular boss 102 and the annular groove 101, the fluid state correlation, the consistency of the pulsation, and the suppression of the vortex-induced vibration.
- the tower 100 of the convex-concave outer surface is provided, and the boundary layer of the entire laminar flow is reliably broken, thereby suppressing the vortex-induced vibration.
- the tower 100 of the present invention is provided with a convex-concave outer surface and an air-guiding groove 102a.
- the main mechanism for suppressing the vortex-induced vibration is to break the boundary layer and aim to fundamentally eliminate the vortex-induced cause, so the depth of the annular groove 101 Smaller, it will not affect the strength of the outer surface of the tower 100, and the noise will be low. It can meet the environmental standards of noise, so it can be used not only in the installation stage but also after the installation.
- the annular groove 101 has a depth of 2-5 mm, is easy to manufacture, and can meet the requirement of breaking the boundary layer which is generally only 1-2 mm thick, and at the same time, the depth can prevent the mold from filling the annular groove in a humid environment. This is almost negligible with respect to the spiral groove formed by the spiral in the background art, so that the noise problem of the spiral is solved. Further, from the mechanism of suppressing the vortex-induced vibration, the present scheme starts from the cause of the vortex-induced vibration caused by the flow-off body, and the vortex-induced vibration suppressing effect is better, and no other vibration is induced.
- the boundary layer of the outer surface of the tower 100 can be turbulent in advance.
- the air guiding groove 102a changes the airflow direction and invades the annular groove 101 at a certain oblique angle, or inhales in the upward wind direction to accelerate the mixing into the boundary layer corresponding to the annular boss 102, and destroys the original boundary layer.
- the laminar flow characteristics cause the turbulent flow to occur in advance, thereby suppressing the flow recirculation backflow under the back pressure gradient, suppressing or preventing the boundary layer from separating the outer surface of the tower 100, so that the tower 100 is partially segmented (partially provided with the annular boss 102, the ring
- the paragraph or all of the paragraphs of the groove 101 become smaller with respect to the aerodynamic coefficient C of the flow around the flow because the resistance of the bypass tower 100 is lowered.
- ⁇ (Re, St) is the frequency at which the vortex shedding, and ⁇ t as a whole is a variable; It is a Reynolds number and is a dimensionless number.
- ⁇ is the wind flow density on the tower 100
- U is the wind speed of the tower 100 on the wind direction
- C is the aerodynamic coefficient of the structural section of the tower 100;
- the aerodynamic coefficient is also called the wind carrier type coefficient, which is the ratio of the pressure (or suction) formed by the wind on the surface of the engineering structure to the theoretical wind pressure calculated according to the flow velocity. It reflects the distribution of stable wind pressure on the engineering structure and the surface of the building, and varies with the shape, dimensions, shielding conditions and airflow direction of the building;
- D is a characteristic dimension when the outer surface of the tower 100 is traversed by the fluid; it is a characteristic dimension of the spatial structure formed by the obstacle facing the fluid when the fluid passes through the obstacle and flows around the obstacle, and is a general term in the field of heat transfer. In this embodiment, it refers to the characteristic dimension of the enclosing structure (here, the outer surface shape of the tower) and the fluid contact surface (here, the air flow), and generally takes the width of the structure perpendicular to the wind direction, and the tower 100 is at the corresponding height. Outer diameter.
- R e is the Reynolds number
- the lateral amplitude variation of the tower 100 structure caused by the vortex force is:
- K is the stiffness of the tower 100 structural system (which may include the nacelle);
- ⁇ is the logarithmic decay rate (about 0.05).
- the structure of the tower 100 may undergo vortex-induced resonance, and the amplitude of the vibration at this time is:
- the definition of the Storoja number describes the relationship between the vortex shedding frequency, the wind speed and the diameter of the cylinder.
- f is the vortex frequency, Hz
- U is the wind speed of the tower 100 on the wind direction
- D is a characteristic dimension when the outer surface of the tower 100 structure is swept by a fluid.
- D in this embodiment refers to the outer diameter of the tower 100 at different heights.
- the path will change.
- the path around the periphery of the tower 100 forms an approximately elliptical shape, as described above for the aerodynamic shape.
- D is the equivalent diameter of the aeroelastic ellipse (heat transfer terminology, which is the diameter of an imaginary circular cross section, that is, the diameter of a non-circular cross section converted into a circular cross section according to the circumference).
- heat transfer terminology which is the diameter of an imaginary circular cross section, that is, the diameter of a non-circular cross section converted into a circular cross section according to the circumference.
- the Storocha number can be obtained according to the Reynolds number.
- the relationship with the Reynolds number can be referred to Figure 7.
- Figure 7 is a schematic diagram of the relationship between the Storocha number and the Reynolds number on the outer surface of the tower.
- the horizontal axis is the Reynolds number and the vertical axis is the Toroha number.
- the Storocha number is a constant of 0.20.
- the Storocha number jumps to 0.30 first, then increases to 0.43, and then when the Reynolds number is equal to 2 ⁇ 10.
- the Stoloha number, D, and U are all available parameters, and f can also be calculated according to the formula of the Stollha number. Accordingly, the amplitude A can also be calculated.
- the inventors have found that when the tower 100 draws energy from the same vortex as its own frequency, the structural vibration pattern of the upper portion of the tower 100 changes, and the changed tower 100 retaining structure will generate airflow. The effect is to make the energy concentrated on the fundamental frequency of the tower 100 structure larger and larger, thereby exciting the vortex-induced resonance of the tower 100 structure.
- the outer surface of the tower 100 is convex and concave, disturbing the upward wind flow, and the air guiding groove 102a also forms an upward and downward angle of attack (ie, changing the local aerodynamic shape) near the upper and lower surfaces of the annular boss 102. Therefore, the upwind flow has a certain turbulence intensity.
- the upwind flow has a certain turbulence intensity
- the upwind has already carried various energy vortices, and has energy of various frequency components. These energy dispersions are large and pulsating.
- the outer surface of the cylinder 100 is used, the integration of the outer surface structure of the tower 100 with the upwind flow occurs on the basis of the vortex in the upwind flow.
- the annular groove 101 and the annular boss 102 may be disposed at the upper portion of the tower 100.
- the entire tower 100 or other sections of the tower 100 may be provided with a convex and concave outer surface to suppress the vortex.
- the role of vibration compared with the lower part, the vibration of the upper part is more obvious, the vibration destructive force is stronger, and the requirement for suppressing vibration is greater. Therefore, only the convex outer surface can be provided on the upper portion to meet the vibration suppression requirement of the tower 100. .
- a convex and concave outer surface is arranged, indicated by a dashed box.
- the upwind flow around the tower 100 is divided into two sections as a whole, in two cases.
- the upper part has a convex-concave outer surface section, and the lower part has no convex-concave surface section; this also breaks the upper and lower correlation of the overall wind direction flow along the outer surface of the tower cylinder 100, prevents the pulsation pressure consistency, and fundamentally prevents the vortex-induced cause .
- the tower 100 with the upper and lower concave surface of the upper portion is in close contact with the outer surface of the tower 100, and the boundary layer separation and the Karman vortex phenomenon are not formed on the rear outer surface, which hinders the vortex on the rear side of the upper tower 100. Formed; the flow velocity of the lower flow is low, and there is no interference of the outer surface of the convex and concave surface. In essence, the situation that the vortex shedding and the lower vortex shedding frequency of the upper tower 100 are consistent in the prior art are completely disturbed, so that they will weaken and reduce the joint action.
- the second case is the appearance of surface features (convex and concave surfaces) in the upper section, breaking the local correlation, preventing the pulsating pressure from being consistent, and fundamentally preventing the vortex.
- Correlation is an important feature of the pulsating wind, where it is related to the pulsating wind speed at two points in space or the pulsating pressure at two points at different heights on the surface of the tower 100.
- the correlation coefficient ⁇ is defined as
- the covariance is the time average of the product of the pulsating wind speed at two altitudes.
- Each wind speed value on the right side of the equation is subtracted from the respective average with
- u(t) is the turbulent component of the downwind direction, that is, the pulsating wind speed component in the direction of the average wind speed.
- the numerator indicates that the tower 100 has different wind speeds at two different heights, and the covariance of the pulsating wind speed.
- the covariance is the time average of the product of the pulsating wind speed at two altitudes.
- the overall intensity of turbulence can be measured by the standard deviation of the wind speed or the root mean square.
- the average component is subtracted from the wind speed, and then the remainder is quantified by the deviation. After the square is deviated, the average is averaged, and finally, the wind speed unit is obtained. Physical quantity, standard deviation is obtained.
- the correlation coefficient is defined by the correlation coefficient.
- the covariance of the wind speed at different heights is divided by the standard deviation to obtain the correlation coefficient between the two wind speeds at different heights. The smaller the correlation, the better, hindering the frequency of the vortex at different heights after the vortex is formed, breaking the frequency. Consistency aggregates and grows vortex-induced resonance energy, ie, prevents the growth of vortex-induced resonance, and even causes vortex-induced resonance to disappear.
- ⁇ (y i -y j ) is the correlation coefficient of the pulsating wind force per paragraph.
- Fig. 4 shows that a convex outer surface is provided at the lower L height section of the top of the tower 100, and the height L is preferably equal to or larger than the length of the blade 300. It will be appreciated that during rotation of the blade 300, the blade 300 may periodically appear above the top of the tower 100 or correspond to the outer surface of the tower 100.
- the back surface of the blade 300 (the side facing the upward wind direction is the front side) is an air flow; and at the outer surface position of the tower 100, the back surface of the blade 300 faces the outer surface of the tower 100, at this time, the air flow is
- the back of the blade 300 is prone to a phenomenon of stagnation of the airflow, causing the corresponding blade 300 to pulsate along the bending moment of the wind direction when passing in front of the tower 100, and transmitting to the blade root causes pulsating load fatigue to the pitch bearing. damage.
- the circumference of the tower of the annular groove 101 is reduced, the airflow can pass faster, the gap with the air flow state of the back blade 300 is reduced, the stagnation phenomenon is slowed, and the pitch bearing is reduced.
- each of the annular bosses 102 is provided with an air guiding groove 102a for introducing an upwind flow into the adjacent upper and lower annular grooves 101, respectively.
- each of the annular grooves 101 has a flow from the top to the bottom, and a flow from the bottom to the top, enhancing the interference to the inner boundary layer of the annular groove 101, and the ring shape.
- the outer surface of the boss 102 separates the airflow upward and downward, and enhances the interference to the boundary layer of the outer surface of the annular boss 102, so that the airflow interference of the annular boss 102 and the annular groove 101 is enhanced, thereby further enhancing the suppression of the vortex The ability to vibrate.
- FIG. 8 is a partial schematic view showing the position of the air outlets of the upper and lower air guiding grooves 102a of the annular groove 101 of FIG.
- the windward direction is introduced to the upper and lower air guiding grooves 102a in the same annular groove 101, and the positions are in one-to-one correspondence, that is, the position of the air outlet of the air guiding groove 102a corresponds to the annular groove 101.
- the airflow drawn from the next two air guiding grooves 102a merges into the annular groove 101, it can collide, cause vortices, strengthen interference, and increase the overall vortex momentum, which helps to prevent the occurrence of the flow around the body.
- Both ports of the air guiding groove 102a can be used as an air outlet.
- one port of the air guiding groove 102a is an air inlet and the other is an air outlet.
- FIG. 9 is a schematic structural view of a second embodiment of the outer surface of the outer surface of the tower 100;
- FIG. 10 is an upper and lower air guiding groove 102a of the annular groove 101 of FIG.
- the upper and lower air guiding grooves 102a are introduced into the same annular groove 101, and the position is displaced, that is, the air outlet position of the air guiding groove 102a is staggered in the circumferential direction. Then, the airflow drawn by the upper and lower adjacent air guiding grooves 102a flows into the annular groove 101, and then flows in the annular groove 101 and excites to form a pulsating flow, specifically, pulsation in the height direction, and pulsation occurs.
- Driving force is applied to form a pulsating flow.
- the pulsating driving force can promote the transition of the boundary layer in advance (the transition of the laminar flow state to the turbulent flow boundary layer), forming a turbulent flow, and having a higher momentum suppression backflow phenomenon under the reverse pressure gradient occurs, further suppressing Or the boundary layer is prevented from separating the surface of the tower 100, and the vortex-induced vibration caused by the flow-off body is suppressed.
- each annular boss 102 is provided with two rows of the air guiding grooves 102a, and each row of the air guiding grooves 102a are staggered in the circumferential direction in an upward inclination and a downward inclination.
- four adjacent air guiding grooves 102a form a diamond shape similar to the inner contraction.
- the air guiding groove 102a on the left side of the diamond shape serves as a main drainage function when the wind direction
- the air guiding groove 102a on the right side of the diamond serves as the main drainage.
- the air guiding grooves 102a having different inclination directions are staggered so that the air guiding grooves 102a of each row of the air guiding grooves 102a can be drained into the corresponding annular grooves 101 regardless of the wind direction, and are not affected by the wind direction. limit.
- the air guiding grooves 102a on the annular boss 102 can be drained to the upper and lower annular grooves 101 of the annular boss 102 regardless of the wind direction. It can be understood that when the upper row of the air guiding grooves 102a in the two rows of the annular boss 102 in FIG. 5 are aligned, only when the wind direction is from left to right or from right to left, the airflow around the annular boss 10 is An annular groove 101 is introduced.
- the inclination directions of the upper and lower rows of the air guiding grooves 102a are different, and the drainage requirements of different wind directions can also be satisfied, but only a plurality of annular grooves 101 are not introduced with airflow.
- the upper and lower positions of the two rows of the air guiding grooves 102a may be one-to-one correspondence, and the oblique directions are also opposite.
- the airflows sucked up and down may be merged to "blow" the outer surface of the annular boss 102. As shown in FIG.
- the two right air guiding grooves 102a are respectively sucked from the upper and lower annular grooves 101. After the airflow, the air is blown to the right side to interfere with the boundary layer of the outer surface of the annular boss 102, and the laminar flow is destroyed, which also promotes the early transition of the boundary layer and suppresses the vortex-induced vibration formed by the flow-through body.
- the two rows of air guiding grooves 102a can also be dislocated.
- the airflow sucked from the annular groove 101 forms a vortex, increases the rotational momentum of the overall vortex, and enhances the viscous force of the boundary layer at the annular boss 102.
- the draft groove 102a is curved.
- the direction of the arc groove protruding from the upwind flow around the annular boss 102 is the same as the direction of the airflow drawn by it. In this way, more airflow can be smoothly taken into the annular groove 101, and the airflow flows more smoothly, and the flow of the drainage flow naturally forms a vortex when flowing out from the air outlet at the arc, thereby increasing the entry into the corresponding annular groove 101.
- the vortex momentum prevents the vortex-induced vibration caused by the vortex shedding and suppresses the vortex-induced vibration. As shown in FIG.
- the left air guiding groove 102a drains from the left to the right upwind, and the arc is protruded to the right, and the right side air guiding groove 102a is drained (non-suction function) from right to left.
- the upward wind is flowing, and the arc is protruding to the left, so it is a rhombic that is indented.
- the shape of the air guiding groove 102a is not limited to an arc shape, and other curved shapes such as smooth may be used, and of course, may be linear.
- the depth of the air guiding groove 102a and the depth of the annular groove 101 may be equal, for example, also set to 2-5 mm.
- the equal depth on the one hand, facilitates the smooth drainage of the draft channel 102a into the annular groove 101, and on the other hand, facilitates the smooth flow of airflow in the annular groove 101 through the draft groove 102a.
- FIG. 11 is a schematic view showing the structure of the annular groove 101 on the outer surface of the tower 100 in a wave shape.
- the air guiding groove 102a is not shown.
- the annular groove 101 may be disposed in a wave shape along the circumferential direction of the tower 100.
- the interfacial structure of the wave structure can drive and induce fluid vibrations in the annular groove 101.
- This basic vibration induces a higher level of harmonic motion in the inner boundary layer of the annular groove 101, which can excite the fluid flow from the laminar flow.
- the turbulent flow has higher momentum to suppress the occurrence of backflow of the flow around the reverse pressure gradient, which in turn inhibits or prevents the boundary layer from separating the outer surface of the tower 100 and suppresses vortex-induced vibration.
- FIG. 12 is a schematic structural view of the turbulent protrusion 103 disposed in the annular groove 101.
- the bottom of the annular groove 101 may be provided with a plurality of turbulent protrusions 103 distributed along the circumference of the tower 100.
- the turbulent protrusion 103 can excite the airflow to form a radial surface pulsation along the tower 100 (with the aforementioned The wavy pulsation direction is vertical) and is periodically excited to pulsate.
- the pulse dynamics here can also make the boundary layer turn ahead, and cause the boundary layer to turn turbulently to form turbulence and suppress vortex-induced vibration.
- FIG. 13 is a schematic structural view of the turbulent protrusion 103 of FIG.
- the curved surface of the turbulent projection 103 faces outward, and when the airflow passes, the resistance to the airflow can be reduced to ensure that the formed pulsation has a certain momentum.
- a plurality of lateral ribs 103a are also provided on the outer surface of the turbulent projection 103 such that the entire turbulent projection 103 forms a convex ridge structure, similar to the "speed bump" on the road, and the turbulent projection 103
- the friction of the outer surface is increased, the adhesion of the boundary layer is increased, and the boundary layer is prevented from being driven by the overall wind direction, which is favorable for the formation of radial pulsation, and the effect is more obvious under the condition of high wind speed.
- the number of turbulent projections 103 distributed in the circumferential direction of the tower 100 gradually increases because the tower 100 tends from top to bottom.
- the circumference becomes longer, and in order to secure the required pulsation frequency, the number of turbulent protrusions 103 is distributed more downwards.
- annular boss 102 and the annular groove 101 there are various ways of forming the annular boss 102 and the annular groove 101.
- an adhesive tape for example, a urethane tape
- This method is simple in operation and low in cost. And easy to replace.
- the tower 100 type enclosure structure generally needs to form an anticorrosive coating on the outer surface, and the anticorrosive coating layer can also be formed by a vacuum impregnation process, and the anticorrosive coating layer forms the annular groove 101 and the air guiding groove 102a during vacuum impregnation. .
- This method is also easy to implement in the process, and the formed structure is integrated with the anti-corrosion coating and is more reliable.
- annular groove 101 and the annular boss 102 In addition to the above-mentioned tape sticking, vacuum impregnation to form the annular groove 101 and the annular boss 102, it can also be cut directly on the outer surface of the tower 100 type of retaining structure.
- a plastic layer may be laid on the outer surface of the enclosure, and then an annular groove 101 is formed on the plastic layer to form an annular boss 102 accordingly.
- FIG. 14 is a schematic diagram showing different structures of the annular groove 101 on the outer surface of the tower 100.
- the annular grooves 101 of different cross-sectional shapes are shown in the same drawing, and are formed during actual processing. It is sufficient to have the annular groove 101 of the same cross section.
- the cross section of the annular groove 101 may be an upper arc shape, a U shape as shown in the lower part, or other shapes such as a curve, a trapezoid, etc., wherein when the arc shape is set, the air flow is more favorable. Flows backward to prevent vortex-induced vibration.
- FIG. 15 is a schematic view showing the width of the annular groove 101 on the outer surface of the tower 100 and the width of the annular boss 102.
- the width of the annular boss 102 and the annular groove 101 may preferably be set as follows:
- H 1 is the width of the annular groove 101
- H 2 is the width of the annular boss 102.
- the definition of the width here is conventionally understood, in fact, the size of the annular groove 101 and the annular boss 102 in the height direction of the tower 100.
- the width of the annular groove 101 is smaller than the width of the annular boss 102 and preferably greater than one tenth of the width of the annular boss 102. Because the annular groove 101 needs a certain width, the convergence of the airflow in the air guiding groove 102a is satisfied, the congestion phenomenon is prevented from being too narrow, and the cross-sectional area of the flow is prevented from being too wide, and the above-mentioned size design can ensure the function of the accelerated airflow. .
- the depth of the annular groove 101 may gradually increase from the bottom to the top.
- the vibration damage of the tower 100 is gradually increased from the bottom to the top. Therefore, the increase in the depth of the annular groove 101 from the bottom to the top can conform to the suppression requirement of the vortex-induced vibration.
- the width of the annular groove 101 can also be gradually increased.
- the tower 100 is taken as an example to illustrate the enclosure structure. It should be understood that the enclosure structure of the present invention is not limited to the tower 100, and other structures having similar structures may be used. It also has a structure for vortex-induced vibration suppression requirements, such as a television tower.
- FIG. 16 is a schematic diagram of the tower 100 with the vibration monitoring device 104 disposed on the inner wall.
- the vibration monitoring device 104 is provided, and the wireless receiving device can be disposed on the ground, so that the operator can grasp the vibration state of the tower 100 on the ground. It helps to facilitate the lifting of the wind turbine when installing wind turbines at high altitudes, on top of high mountains or on the mountainside.
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Abstract
Description
Claims (16)
- 外表面具有抑制涡激振动功能的围护结构,其特征在于,所述围护结构的外表面设有若干环绕所述围护结构的环形凹槽(101),使所述围护结构的外表面形成凹凸相间的环形凹槽(101)、环形凸台(102);且,所述环形凸台(102)外表面设有若干引风沟槽(102a),若干所述引风沟槽(102a)沿所述环形凸台(102)的周向分布;所述引风沟槽(102a)向上或向下倾斜,将流向所述环形凸台(102)的部分上风向来流引入与所述环形凸台(102)相邻的所述环形凹槽(101)内。
- 如权利要求1所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,每个所述环形凸台(102)设有向上以及向下倾斜的所述引风沟槽(102a),以将所述上风向来流引入与所述环形凸台(102)相邻的上、下所述环形凹槽(101)内。
- 如权利要求2所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,引入上风向来流至同一所述环形凹槽(101)内的上、下所述引风沟槽(102a),位置一一对应,或位置相互错离。
- 如权利要求2所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述环形凸台(102)设有两排所述引风沟槽(102a),每一排所述引风沟槽(102a)依序按照向上倾斜、向下倾斜交错布置。
- 如权利要求4所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,两排所述引风沟槽(102a)中,上排、下排的所述引风沟槽(102a)位置一一对应,且倾斜方向相反。
- 如权利要求4所述的外表面具有抑制涡激振动功能的围护结构,其 特征在于,所述引风沟槽(102a)为弧形或其他曲线形。
- 如权利要求1所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述引风沟槽(102a)的深度与所述环形凹槽(101)的深度相等。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述环形凹槽(101)沿所述围护结构的周向呈波浪状设置。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述环形凹槽(101)和/或所述环形凸台(102)的底部设有沿所述围护结构周向分布的绊流凸起(103)。
- 如权利要求9所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述绊流凸起(103)一侧表面贴附于所述环形凹槽(101)的底部,另一侧表面呈弧形,且所述绊流凸起(103)的外表面设有若干横向凸棱(103a)。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述环形凸台(102)由胶带粘结于所述围护结构的外表面形成,相邻所述胶带之间形成所述环形凹槽(101);或,所述围护结构的外表面通过真空浸渍工艺形成防腐涂层,所述防腐涂层在真空浸渍时形成所述环形凹槽(101)和所述引风沟槽(102a)。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,从下至上,所述环形凹槽(101)的深度逐渐增加,和/或,所述环形凹槽(101)的宽度逐渐增加。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述围护结构为风力发电机组的塔筒(100)或电视塔。
- 如权利要求14所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述环形凹槽(101)、所述环形凸台(102)均设于所述塔筒(100)的上部,设有所述环形凹槽(101)、所述环形凸台(102)的所述塔筒(100)的段落高度大于所述塔筒(100)顶部的叶片(300)的长度。
- 如权利要求1-7任一项所述的外表面具有抑制涡激振动功能的围护结构,其特征在于,所述围护结构内壁设有振动监测装置(104)。
Priority Applications (4)
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AU2018271387A AU2018271387B2 (en) | 2017-09-11 | 2018-04-24 | Enclosure having outer surface with vortex-induced vibration suppression function |
EP18811121.5A EP3480457B1 (en) | 2017-09-11 | 2018-04-24 | Exterior-enclosed construction with outer surface having function of suppressing vortex-induced vibration |
ES18811121T ES2885110T3 (es) | 2017-09-11 | 2018-04-24 | Construcción cerrada al exterior con superficie externa que tiene una función de supresión de vibración inducida por vórtice |
US16/306,539 US11131109B2 (en) | 2017-09-11 | 2018-04-24 | Enclosure having outer surface with vortex-induced vibration suppression function |
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CN201710812913.7A CN107461302B (zh) | 2017-09-11 | 2017-09-11 | 外表面具有抑制涡激振动功能的围护结构 |
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CN108253524A (zh) * | 2017-12-22 | 2018-07-06 | 西安科技大学 | 双多棱柱仿动态自然风发生器 |
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EP3480457A1 (en) | 2019-05-08 |
US11131109B2 (en) | 2021-09-28 |
AU2018271387B2 (en) | 2019-08-29 |
US20210222451A1 (en) | 2021-07-22 |
ES2885110T3 (es) | 2021-12-13 |
CN107461302B (zh) | 2018-10-02 |
EP3480457B1 (en) | 2021-05-26 |
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CN107461302A (zh) | 2017-12-12 |
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