Calculation method for vortex-induced resonance region of wind turbine blade, and vortex suppression apparatus

Abstract

The present invention relates to the technical field of wind power devices. Provided are a calculation method for a vortex-induced resonance region of a wind turbine blade, and a vortex suppression apparatus. The method of the present invention comprises: first, acquiring the natural frequency of a wind turbine blade; then, segmenting the wind turbine blade to obtain a plurality of blade segments; next, separately calculating a vortex shedding frequency of the cross section of each blade segment under different wind speeds or different operating conditions; and finally, comparing the vortex shedding frequency of the cross section of each blade segment under different wind speeds or different operating conditions with the natural frequency, in order to determine a vortex-induced vibration region of the wind turbine blade. In the technical solution, a primary energy injection region of a wind turbine blade where vortex-induced vibration occurs, i.e., a vortex-induced vibration region, is identified, such that a vortex suppression apparatus is mounted in the vortex-induced vibration region, thereby improving the effectiveness of vortex suppression measures, and also reducing the ineffective arrangement of vortex suppression apparatuses, and thus saving costs.

Description

A method for calculating the vortex-induced resonance region of wind turbine blades and an anti-vortex-induced device Technical Field

[0001] This invention relates to the field of wind power equipment technology, and in particular to a method for calculating the vortex-induced resonance region of wind turbine blades and an anti-vortex-induced device. Background Technology

[0002] With the development of wind power generation technology and equipment, users are increasingly demanding higher standards for the efficiency, safety, and lifespan of wind turbines. At specific wind speeds, wind turbine blades exhibit periodic vibrations due to hydrodynamic effects. This vibration typically arises from vortices formed by the blades in flowing air. When the frequency of these vortices detaching is close to the blade's natural frequency, resonance occurs, causing significant blade vibration. Current technology employs anti-vortex-induced vibration devices on the turbine blades to suppress this vibration. If these devices are precisely installed in the vortex-induced resonance region, they achieve the desired effect. However, if the installation is inaccurate, the device becomes ineffective and fails to provide adequate protection. Therefore, the installation location of the anti-vortex-induced vibration device is crucial, necessitating a method to accurately identify the vortex-induced resonance region for effective placement of the device. Summary of the Invention

[0003] One objective of this invention is to provide a method for calculating the vortex-induced resonance region of wind turbine blades, thereby solving the technical problem that the ineffective arrangement of anti-vortex-induced devices affects the anti-vortex-induced effect in the prior art.

[0004] A further objective of this invention is to enable more accurate calculation of the vortex-induced vibration region.

[0005] Another object of the present invention is to provide an anti-vortex-induced device to improve the anti-vortex-induced effect.

[0006] Specifically, the present invention provides a method for calculating the vortex-induced resonance region of a wind turbine blade, comprising the following steps:

[0007] Obtain the natural frequency of the wind turbine blades;

[0008] The wind turbine blades are segmented to obtain multiple blade sections;

[0009] Calculate the vortex shedding frequency of each blade section under different wind speeds or operating conditions.

[0010] The vortex shedding frequency of each blade section under different wind speeds or operating conditions is compared with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade.

[0011] Optionally, the step of calculating the vortex shedding frequency of the cross section of each blade segment under different wind speeds or operating conditions specifically includes:

[0012] Obtain wind speed information and the airfoil chord length of each blade section;

[0013] Based on the wind speed information and the airfoil chord length of each blade section, the vortex shedding frequency of each blade section under different wind speeds is calculated.

[0014] Optionally, the vortex shedding frequency of each blade section at different wind speeds can be calculated using the following formula:

[0015] Sr = f D / U Formula (1);

[0016] Where Sr represents the Strouhal number, f represents the vortex shedding frequency, D represents the airfoil chord length of the blade section, and U represents the wind speed.

[0017] Optionally, the step of calculating the vortex shedding frequency of the cross section of each blade segment under different wind speeds or operating conditions specifically includes:

[0018] Simulations were performed on the cross section of each blade section under different angles of attack and different wind speeds to obtain the corrected Strouhal number of the cross section of each blade section under different operating conditions. The distance between free streamlines at the wake formed by the airflow passing through the cross section of each blade section and the free velocity at the flow separation point of the cross section of each blade section were also obtained.

[0019] The vortex shedding frequency of each blade section under different operating conditions is calculated based on the corrected Strauhal number, the distance between free streamlines in the wake formed by the airflow passing through the cross section of each blade section, and the free velocity at the flow separation point of each blade section.

[0020] Optionally, the vortex shedding frequency of each blade section under different operating conditions can be calculated according to the following formula:

[0021] Universal Sr = f D' / Us Formula (2);

[0022] Where Universal Sr represents the corrected Strouhal number, f represents the vortex shedding frequency, Us represents the free velocity at the flow separation point in the cross section of the blade section, and D' represents the distance between free streamlines in the wake formed by the airflow passing through the cross section of the blade section.

[0023] Optionally, the step of calculating the vortex shedding frequency of the cross section of each blade segment under different wind speeds or operating conditions specifically includes:

[0024] Construct the target model;

[0025] The cross section of each blade segment is input into the target model to obtain the vortex shedding frequency of each blade segment under different operating conditions.

[0026] Optionally, the step of inputting the cross-section of each blade segment into the target model to obtain the vortex shedding frequency of the cross-section of each blade segment under different operating conditions specifically includes:

[0027] The geometric model of the wind turbine blade is input into the target model to determine the computational domain and boundary conditions;

[0028] The computational domain is divided into grids and its parameters are set.

[0029] The motion of the fan blades in the flow field is realized by using dynamic mesh technology and developing a UDF program;

[0030] The vortex-induced vibration of the wind turbine blades was simulated under different wind speeds and angles of attack.

[0031] The simulation results were extracted and calculated to obtain the vortex shedding frequency of each blade section under different operating conditions.

[0032] Optionally, the step of comparing the vortex shedding frequency of the cross section of each blade segment under different wind speeds or operating conditions with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade further includes:

[0033] Obtain the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region;

[0034] The final vortex-induced vibration region of the wind turbine blade is determined based on the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region.

[0035] Optionally, the natural frequencies of the wind turbine blades include a first-order natural frequency and a second-order natural frequency.

[0036] In particular, the present invention also provides a computer device including a memory, a processor, and a machine-executable program stored in the memory and running on the processor, wherein the processor executes the machine-executable program to implement the above-described calculation method.

[0037] In particular, the present invention also provides an anti-vortex-induced vibration device for a wind turbine blade, disposed in the vortex-induced vibration region of the wind turbine blade, the anti-vortex-induced vibration device comprising:

[0038] At least one set of tilted spoiler blocks, each set of tilted spoiler blocks including at least a first tilted spoiler block disposed at the leading edge of the wind turbine blade and at least one second tilted spoiler block disposed at the trailing edge of the wind turbine blade, wherein both the first tilted spoiler block and the second tilted spoiler block extend obliquely out of the wind turbine blade; and

[0039] At least one set of spanwise spoilers, each set of the spanwise spoilers includes at least one first spanwise spoiler arranged at the leading edge of the wind turbine blade and at least one second spanwise spoiler arranged at the trailing edge of the wind turbine blade, wherein the first spanwise spoiler and the second spanwise spoiler are both arranged along the extension direction of the wind turbine blade.

[0040] Optionally, the number of inclined baffle blocks is multiple, the number of spanwise baffle strips is multiple, and the multiple sets of inclined baffle blocks and multiple sets of spanwise baffle strips are arranged alternately along the extension direction of the wind turbine blades.

[0041] Optionally, in each group of inclined baffle blocks, the first inclined baffle block and the second inclined baffle block are both inclined toward the tip of the wind turbine blade or both are inclined toward the root of the wind turbine blade.

[0042] Optionally, in the multiple sets of tilted spoiler blocks, the first tilted spoiler blocks have the same tilting direction, and the second tilted spoiler blocks have the same tilting direction.

[0043] Optionally, in two adjacent groups of inclined spoiler blocks, the first inclined spoiler blocks have opposite inclination directions, and the second inclined spoiler blocks have opposite inclination directions.

[0044] Optionally, in each group of tilted baffle blocks, the first tilted baffle block is arranged on the pressure side or suction side of the wind turbine blade, and the second tilted baffle block is arranged on the side opposite to the first tilted baffle block.

[0045] Optionally, in the multiple sets of tilted baffle blocks, the first tilted baffle block is arranged on the pressure side or the suction side of the fan blade.

[0046] Optionally, in each group of spanwise deflectors, the first spanwise deflector is arranged on the pressure side or suction side of the wind turbine blade, and the second spanwise deflector is arranged on the side opposite to the first spanwise deflector.

[0047] Optionally, in two adjacent groups of spanwise deflector strips, the first spanwise deflector strips of the two groups are respectively arranged on the pressure side and the suction side of the wind turbine blade.

[0048] Optionally, in each group of spanwise spoilers, both the first spanwise spoiler and the second spanwise spoiler extend beyond the fan blades.

[0049] This invention first obtains the natural frequency of the wind turbine blade, then segments the blade to obtain multiple blade sections. Next, it calculates the vortex shedding frequency of each blade section under different wind speeds or operating conditions. Finally, it compares the vortex shedding frequency of each blade section under different wind speeds or operating conditions with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade. This technical solution clearly identifies the main energy injection region where vortex-induced vibration occurs in wind turbine blades, i.e., the vortex-induced vibration region. Installing anti-vortex-induced vibration devices in this region improves the effectiveness of anti-vortex-induced vibration measures and reduces the ineffective placement of these devices, thus saving costs.

[0050] Furthermore, this invention first simulates the cross-section of each blade segment under different angles of attack and wind speeds to obtain the corrected Strouhal number of each blade segment under different operating conditions. It also obtains the distance between free streamlines in the wake formed by the airflow passing through the cross-section of each blade segment and the free velocity at the flow separation point of each blade segment. Then, based on the corrected Strouhal number, the distance between free streamlines in the wake formed by the airflow passing through the cross-section of each blade segment, and the free velocity at the flow separation point of each blade segment, the vortex shedding frequency of each blade segment under different operating conditions is calculated. The above technical solution fully considers the cross-sectional shape of different blade segments and its influence on the Strouhal number under different angles of attack and wind speeds. Using two-dimensional numerical simulation, the cross-sectional shape of different blade segments is calculated under different angles of attack and wind speeds to obtain the corrected Strouhal number under different operating conditions. This allows for a more accurate calculation of the vortex shedding frequency, thus enabling a more precise determination of the vortex-induced vibration region.

[0051] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0052] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0053] Figure 1 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to an embodiment of the present invention;

[0054] Figure 2 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention;

[0055] Figure 3 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention;

[0056] Figure 4 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention;

[0057] Figure 5 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention;

[0058] Figure 6 is a schematic diagram of the vortex-induced resonance region for stimulating various orders of vortex-induced vibration phenomena of wind turbine blades according to an embodiment of the present invention.

[0059] Figure 7 is a schematic diagram of the final vortex-induced resonance region of the vortex-induced vibration phenomenon of each order of the wind turbine blade according to an embodiment of the present invention.

[0060] Figure 8 is a schematic block diagram of a computer device according to an embodiment of the present invention;

[0061] Figure 9 is a schematic structural diagram of an anti-vortex-induced device installed in the vortex-induced vibration region of a wind turbine blade according to an embodiment of the present invention.

[0062] Figure 10 is a schematic enlarged view of part A in Figure 9;

[0063] Figure 11 is a schematic structural diagram of an anti-vortex-induced device according to an embodiment of the present invention;

[0064] Figure 12 is a schematic structural diagram of an anti-vortex device according to another embodiment of the present invention;

[0065] Figure 13 is a schematic structural diagram of an anti-vortex-induced device according to yet another embodiment of the present invention;

[0066] Figure 14 is a schematic structural diagram of an anti-vortex-induced device according to another embodiment of the present invention.

[0067] Figure label:

[0068] 100 - Computer equipment; 110 - Processor; 120 - Memory; 130 - Machine-executable program; 200 - Wind turbine blade; 300 - Anti-vortex-induced device; 310 - Inclined spoiler block group; 320 - Spanning spoiler strip group; 311 - First inclined spoiler block; 312 - Second inclined spoiler block; 321 - First spanning spoiler strip; 322 - Second spanning spoiler strip. Detailed Implementation

[0069] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0070] In the description of this embodiment, it should be understood that the terms "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0071] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0072] Unless otherwise expressly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0074] Figure 1 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to an embodiment of the present invention. As shown in Figure 1, in one embodiment, the method for calculating the vortex-induced resonance region of a wind turbine blade includes the following steps:

[0075] Step S100: Obtain the natural frequency of the wind turbine blades;

[0076] Step S200: Divide the wind turbine blades into segments to obtain multiple blade sections;

[0077] Step S300: Calculate the vortex shedding frequency of each blade section under different wind speeds or operating conditions.

[0078] Step S400: Compare the vortex shedding frequency of each blade section under different wind speeds or operating conditions with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade.

[0079] This embodiment clarifies the main energy injection area for vortex-induced vibration of wind turbine blades, namely the vortex-induced vibration area, so that anti-vortex-induced vibration devices can be installed in the vortex-induced vibration area, thereby improving the effectiveness of anti-vortex-induced vibration measures and reducing the ineffective arrangement of anti-vortex-induced vibration devices, thus saving costs.

[0080] In step S100, the natural frequencies of the wind turbine blades include the first-order natural frequency and the second-order natural frequency. The mode shape of the wind turbine blades can be obtained simultaneously with the natural frequencies. It can be understood that the vortex shedding frequency calculated in this embodiment is compared with both the first-order and second-order natural frequencies to determine the vortex-induced vibration regions at different natural frequencies.

[0081] In step S200, the wind turbine blades can be segmented at equal intervals. In other embodiments, the wind turbine blades can also be segmented according to other segmentation rules.

[0082] Figure 2 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention. As shown in Figure 2, in some embodiments, step S300 specifically includes:

[0083] Step S310: Obtain wind speed information and the airfoil chord length of each blade section;

[0084] Step S320: Calculate the vortex shedding frequency of each blade section at different wind speeds based on the wind speed information and the airfoil chord length of each blade section.

[0085] This embodiment is equivalent to calculating the vortex shedding frequency using the classical definition method. When fluid flows through a structure submerged in it, flow separation occurs, generating a series of regularly arranged vortices behind the structure. Specifically, the vortex shedding frequency of each blade section at different wind speeds is calculated using the following formula:

[0086] Sr = f D / U Formula (1);

[0087] Where Sr represents the Strouhal number, f represents the vortex shedding frequency, D represents the airfoil chord length of the blade section, and U represents the wind speed.

[0088] Here, the Strauhal number is a dimensionless parameter that is related to the cross-sectional shape and Reynolds number. It is simply considered as the Sr of a circular cross-section, and within the current Reynolds number range, Sr is treated as a constant. The wind speed is specifically the average incoming wind speed. Because the Sr of the wind turbine blades has been simplified, the vortex-induced vibration region needs to be safely enlarged after using this method to calculate the vortex-induced vibration region. Formula (1) is essentially the first method for calculating the vortex-induced vibration region.

[0089] Figure 3 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention. As shown in Figure 3, in some embodiments, step S300 specifically includes:

[0090] Step S330: Simulate the cross section of each blade section under different angles of attack and different wind speeds to obtain the corrected Strouhal number of the cross section of each blade section under different operating conditions, and obtain the distance between free streamlines at the wake formed by the airflow passing through the cross section of each blade section and the free velocity at the flow separation point of the cross section of each blade section.

[0091] Step S340: Calculate the vortex shedding frequency of each blade section under different operating conditions based on the corrected Strauhal number, the distance between free streamlines in the wake formed by the airflow passing through the cross section of each blade section, and the free velocity at the flow separation point of each blade section.

[0092] Specifically, the vortex shedding frequency of each blade section under different operating conditions is calculated using the following formula:

[0093] Universal Sr = f D' / Us Formula (2);

[0094] Where Universal Sr represents the corrected Strouhal number, f represents the vortex shedding frequency, Us represents the free velocity at the flow separation point in the blade section, and D' represents the distance between free streamlines in the wake formed by the airflow passing through the cross section of the blade section.

[0095] In the calculation of formula (1) above, the cross-sectional shape of different blade sections and their influence on the Strouhal number under different angles of attack and wind speeds are ignored. This embodiment fully considers the cross-sectional shape of different blade sections and their influence on the Strouhal number under different angles of attack and wind speeds. With the help of two-dimensional numerical simulation, two-dimensional numerical simulation calculations are performed on the cross-sectional shape of different blade sections under different angles of attack and different wind speeds to obtain the corrected Strouhal number under different operating conditions. Thus, the vortex shedding frequency can be calculated more accurately, so as to determine the vortex-induced vibration region more accurately. Here, this embodiment is equivalent to using a semi-theoretical and semi-empirical mathematical model correction method, and formula (2) is equivalent to the second method for calculating the vortex-induced vibration region.

[0096] Figure 4 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention. As shown in Figure 4, in some embodiments, the step of calculating the vortex shedding frequency of the cross section of each blade segment under different wind speeds or different operating conditions specifically includes:

[0097] Step S350: Construct the target model;

[0098] Step S360: Input the cross section of each blade segment into the target model to obtain the vortex shedding frequency of each blade segment under different operating conditions.

[0099] Figure 5 is a schematic flowchart of a method for calculating the vortex-induced resonance region of a wind turbine blade according to another embodiment of the present invention. As shown in Figure 5, step S360 specifically includes:

[0100] Step S361: Input the geometric model of the wind turbine blade into the target model to determine the computational domain and boundary conditions;

[0101] Step S362: Grid the computational domain and set its parameters;

[0102] Step S363: The motion of the fan blades in the flow field is realized by using dynamic mesh technology and developing a UDF program;

[0103] Step S364: Simulate vortex-induced vibration of the wind turbine blades under different wind speeds and angles of attack;

[0104] Step S365: Extract the simulation results and perform calculations and analysis to obtain the vortex shedding frequency of each blade section under different working conditions.

[0105] In the calculation process of formula (2), the three-dimensional effect of the wake vortex after the airflow passes through the fan blade is ignored. However, this embodiment takes into account the three-dimensional effect of the wake vortex after the airflow passes through the fan blade. The vortex shedding frequency is calculated by using a three-dimensional model, which can obtain a more accurate vortex shedding frequency. This calculation method is equivalent to the third method for calculating the vortex-induced vibration region.

[0106] Figure 6 is a schematic diagram of the vortex-induced resonance region for inducing vortex-induced vibration phenomena of various orders of wind turbine blades according to an embodiment of the present invention. As shown in Figure 6, in step S400, by comparing the vortex shedding frequency with the natural frequency, the cross-sectional regions of the vortex shedding frequency near the natural frequencies of various orders of wind turbine blades under different wind speeds or different operating conditions are identified. These cross-sectional regions are the vortex-induced vibration regions for inducing vortex-induced vibration phenomena of various orders of wind turbine blades, i.e., the key regions.

[0107] Figure 7 is a schematic diagram of the final vortex-induced resonance region of various orders of vortex-induced vibration phenomena of wind turbine blades according to an embodiment of the present invention. As shown in Figure 7, in some embodiments, step S400 further includes the following:

[0108] Step 1: Obtain the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region;

[0109] Step 2: Determine the final vortex-induced vibration region of the wind turbine blades based on the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region.

[0110] In this embodiment, when calculating the vortex-induced vibration region of each order, the relative energy contribution of the vortex-induced vibration region to the wind turbine blade is related to the mode amplitude, frequency and wind speed of the vortex-induced vibration region. By comprehensively considering the above parameters, the main injection region of vortex vibration energy of the wind turbine blade under each mode can be determined, and the final vortex-induced vibration region is obtained, which is the circled region in Figure 7. Arranging anti-vortex-induced devices in the circled region can improve the anti-vortex-induced effect.

[0111] When airflow passes over wind turbine blades, it generates periodically alternating vortices in the wake on both sides of the blades, causing periodic changes on the blade surface and thus generating periodic vortex-induced forces. When the wind speed increases to a certain value, the vortex shedding frequency becomes close to the natural frequency of the wind turbine blades, exciting vortex-induced resonance. In practical applications, vortex-induced vibration in the direction of wobbling is prone to occur after blade transportation and installation but before grid connection; therefore, it is necessary to obtain the natural frequencies of the wind turbine blades.

[0112] When vortex-induced resonance occurs in wind turbine blades, their amplitude increases significantly, causing a violent interaction between the blade motion and the airflow—a phenomenon known as aeroelasticity. This aeroelasticity causes the vortex shedding frequency to be controlled by the natural frequency of the wind turbine blades. That is, even when wind speed changes cause the Stolaha frequency to deviate from the blades' natural frequency to a certain extent, the vortex shedding frequency will still be locked near the blades' natural frequency. In other words, when vortex-induced resonance occurs in wind turbine blades, the vortex-induced frequency will not change with wind speed within a certain wind speed range. Therefore, the vortex-induced vibration region can be calculated using three methods, and finally, the main injection region of vortex-induced vibration energy in each mode of the wind turbine blades can be calculated, i.e., the final vortex-induced vibration region.

[0113] Figure 8 is a schematic block diagram of a computer device 100 according to an embodiment of the present invention. As shown in Figure 8, this embodiment also provides a computer device 100, which includes a memory 120, a processor 110, and a machine-executable program 130 stored in the memory 120 and running on the processor 110. When the processor 110 executes the machine-executable program, it implements the computational method in any of the above embodiments. The processor 110 may be a central processing unit (CPU), a digital processing unit, etc. The processor 110 sends and receives data through a communication interface. The memory 120 is used to store the machine-executable program 130 executed by the processor 110. The memory 120 can be any medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, or it may be a combination of multiple memories 120. The above-described computational program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or external storage device via a network (e.g., the Internet, a local area network, a wide area network, and / or a wireless network). Here, the memory 120 and the processor 110 can be integrated together or set up separately.

[0114] Figure 9 is a schematic structural diagram of an anti-vortex-induced vibration device 300 installed in the vortex-induced vibration region of a wind turbine blade 200 according to an embodiment of the present invention. Figure 10 is a schematic enlarged view of part A in Figure 9. Figure 11 is a schematic structural diagram of an anti-vortex-induced vibration device 300 according to an embodiment of the present invention. Figure 12 is a schematic structural diagram of an anti-vortex-induced vibration device 300 according to another embodiment of the present invention. Figure 13 is a schematic structural diagram of an anti-vortex-induced vibration device 300 according to yet another embodiment of the present invention. Figure 14 is a schematic structural diagram of an anti-vortex-induced vibration device 300 according to yet another embodiment of the present invention. As shown in Figures 9 to 14, in a specific embodiment, the anti-vortex-induced vibration device 300 of the wind turbine blade 200 is arranged in the vortex-induced vibration region of the wind turbine blade 200. The anti-vortex-induced vibration device 300 includes at least one set of inclined baffle blocks 310 and at least one set of spanwise baffle strips 320. Each set of inclined spoiler blocks 310 includes at least a first inclined spoiler block 311 disposed at the leading edge of the wind turbine blade 200 and at least a second inclined spoiler block 312 disposed at the trailing edge of the wind turbine blade 200. Both the first inclined spoiler block 311 and the second inclined spoiler block 312 extend obliquely out of the wind turbine blade 200. Each set of spanwise spoilers includes at least a first spanwise spoiler 321 disposed at the leading edge of the blade and at least a second spanwise spoiler 322 disposed at the trailing edge of the blade. Both the first spanwise spoiler 321 and the second spanwise spoiler 322 are arranged along the extension direction of the wind turbine blade 200. Here, the first inclined spoiler block 311, the second inclined spoiler block 312, the first spanwise spoiler 321, and the second spanwise spoiler 322 are all installed on the wind turbine blade 200 by straps. By changing the chord length of the wind turbine blade 200, the vortex shedding frequency of the cross section of the wind turbine blade 200 can be changed, thus affecting the injection of vortex-induced vibration energy. The first inclined spoiler block 311 and the second inclined spoiler block 312 of each group of inclined spoiler blocks 310 can be understood as being in the same phase as the wind turbine blade 200. The first spanwise spoiler strip 321 and the second spanwise spoiler strip 322 of each group of spanwise spoiler strips 320 can be understood as being in the same phase as the wind turbine blade 200.

[0115] Referring to Figures 11 to 14, there are multiple sets of inclined baffle block groups 310 and multiple sets of spanwise baffle strip groups 320. These multiple sets of inclined baffle block groups 310 and multiple sets of spanwise baffle strip groups 320 are arranged alternately along the extension direction of the wind turbine blade 200. In this embodiment, the spanwise baffle strips are closely arranged between adjacent sets of inclined baffle block groups 310, causing continuous disturbance to the external dimensions of the wind turbine blade 200 and disrupting the continuous energy injection along the blade span.

[0116] Referring to Figure 11, both the first inclined baffle block 311 and the second inclined baffle block 312 protrude inclinedly from the fan blade 200, and the inclination angle is determined according to specific design requirements. Preferably, the first inclined baffle block 311 and the second inclined baffle block 312 are arranged symmetrically along the centerline of the fan blade 200.

[0117] In some embodiments, in each group of tilted baffle blocks 310, the first tilted baffle block 311 and the second tilted baffle block 312 are both tilted toward the tip of the wind turbine blade 200 or both are tilted toward the root of the wind turbine blade 200. Referring to Figure 11, that is, in each group of tilted baffle blocks 310, the first tilted baffle block 311 and the second tilted baffle block 312 are both tilted to the left or to the right.

[0118] Referring to Figures 11 and 12, in some embodiments, the first inclined baffle blocks 311 in adjacent groups of inclined baffle block groups 310 have opposite inclination directions, and the second inclined baffle blocks 312 have opposite inclination directions. Here, if the first inclined baffle blocks 311 of one group are inclined towards the root of the fan blade 200, then the first inclined baffle blocks 311 of the other group are inclined towards the tip of the fan blade 200. If the second inclined baffle blocks 312 of one group are inclined towards the root of the fan blade 200, then the second inclined baffle blocks 312 of the other group are inclined towards the tip of the fan blade 200. The first inclined baffle blocks 311 and the second inclined baffle blocks 312 in each group of inclined baffle block groups 310 have the same inclination direction.

[0119] Referring to Figures 13 and 14, in some embodiments, the first tilted baffle 311 in the multiple sets of tilted baffle blocks 310 has the same tilting direction, and the second tilted baffle 312 has the same tilting direction.

[0120] Referring to Figures 11 to 14, in each group of inclined baffle blocks 310, the first inclined baffle block 311 is arranged on the pressure side or suction side of the fan blade 200, and the second inclined baffle block 312 is arranged on the opposite side to the first inclined baffle block 311. This can be understood as follows: if the first inclined baffle block 311 is arranged on the pressure side of the fan blade 200, then the second inclined baffle block 312 is arranged on the suction side of the fan blade 200. Similarly, if the first inclined baffle block 311 is arranged on the suction side of the fan blade 200, then the second inclined baffle block 312 is arranged on the pressure side of the fan blade 200. This embodiment uses a spiral arrangement to avoid generating in-phase vortex-induced forces on the fan blade 200, thus preventing vibration excitation.

[0121] Referring to Figures 11 to 14, in some embodiments, the first inclined baffle 311 in the multiple sets of inclined baffle block groups 310 is arranged on either the pressure side or the suction side of the fan blade 200. This can be understood as follows: the first inclined baffle 311 in the multiple sets of inclined baffle block groups 310 is arranged on the pressure side of the fan blade 200, and the second inclined baffle 312 is arranged on the suction side of the fan blade 200. The first inclined baffle 311 in the multiple sets of inclined baffle block groups 310 is arranged on the suction side of the fan blade 200, and the second inclined baffle 312 is arranged on the pressure side of the fan blade 200.

[0122] Referring to Figures 11 to 14, in some embodiments, in each group of spanwise deflector strips 320, the first spanwise deflector strip 321 is arranged on the pressure side or suction side of the fan blade 200, and the second spanwise deflector strip 322 is arranged on the side opposite to the first spanwise deflector strip 321. Here, if the first spanwise deflector strip 321 is arranged on the pressure side of the fan blade 200, then the second spanwise deflector strip 322 is arranged on the suction side of the fan blade 200. If the first spanwise deflector strip 321 is arranged on the suction side of the fan blade 200, then the second spanwise deflector strip 322 is arranged on the pressure side of the fan blade 200.

[0123] In some embodiments, two sets of first spanwise deflectors 321 in two adjacent sets of spanwise deflector groups 320 are respectively arranged on the pressure side and suction side of the fan blade 200. Here, if one set of first spanwise deflectors 321 is arranged on the pressure side of the fan blade 200, then the other set of first spanwise deflectors 321 is arranged on the suction side of the fan blade 200. Furthermore, if one set of second spanwise deflectors 322 is arranged on the pressure side of the fan blade 200, then the other set of second spanwise deflectors 322 is arranged on the suction side of the fan blade 200. In each set of spanwise deflector groups 320, the first spanwise deflector 321 and the second spanwise deflector 322 are respectively arranged on the pressure side and suction side of the fan blade 200.

[0124] Referring to Figures 12 and 13, in some embodiments, the first spanwise spoiler 321 and the second spanwise spoiler 322 in each spanwise spoiler group 320 extend beyond the fan blade 200. Referring to Figures 11 and 14, in another embodiment, the outermost edges of the first spanwise spoiler 321 and the second spanwise spoiler 322 in each spanwise spoiler group 320 are flush with the fan blade 200, that is, they do not protrude from the fan blade 200. The specific design can be customized according to design requirements.

[0125] In this embodiment, inclined baffle block groups 310 and spanwise baffle strip groups 320 can be arranged in the calculated final vortex-induced vibration region. Inclined baffle block groups 310 are installed every 3m at the leading and trailing edges of the wind turbine blade 200 by elastic straps, and spanwise baffle strip groups 320 are closely arranged between the inclined baffle block groups 310.

[0126] Figures 11 to 14 illustrate four arrangement schemes for the inclined spoiler block group 310 and the spanwise spoiler strip group 320. In other embodiments, the arrangement can also be made according to specific design requirements.

[0127] In this embodiment, inclined turbulence blocks and spanwise turbulence strips are arranged in the vortex-induced vibration region of the fan blade 200. On the one hand, the airflow passing through the fan blade 200 is subjected to significant irregular disturbances, which can effectively suppress the vortex-induced vibration of the fan blade 200. On the other hand, the vortex-induced vibration region clarifies the arrangement range of the anti-vortex-induced device 300, increases the effectiveness of the anti-vortex-induced device 300, and reduces unnecessary arrangement of the anti-vortex-induced device 300, reducing the impact on the paint surface of the fan blade 200 and the amount of disassembly work required for the anti-vortex-induced device 300.

[0128] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A method of calculating a vortex-induced vibration resonance region of a wind turbine blade, characterized in that, Includes the following steps: Obtain the natural frequency of the wind turbine blades; The wind turbine blades are segmented to obtain multiple blade sections; Calculate the vortex shedding frequency of each blade section under different wind speeds or operating conditions. The vortex shedding frequency of each blade section under different wind speeds or operating conditions is compared with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade.

2. The calculation method according to claim 1, characterized in that, The steps for calculating the vortex shedding frequency of each blade section under different wind speeds or operating conditions specifically include: Obtain wind speed information and the airfoil chord length of each blade section; Based on the wind speed information and the airfoil chord length of each blade section, the vortex shedding frequency of each blade section under different wind speeds is calculated.

3. The calculation method according to claim 2, characterized in that, The vortex shedding frequency of each blade section at different wind speeds is calculated using the following formula: Sr = f D / U Formula (1); Where Sr represents the Strouhal number, f represents the vortex shedding frequency, D represents the airfoil chord length of the blade section, and U represents the wind speed.

4. The computational method of claim 1, wherein, The steps for calculating the vortex shedding frequency of each blade section under different wind speeds or operating conditions specifically include: Simulations were performed on the cross section of each blade section under different angles of attack and different wind speeds to obtain the corrected Strouhal number of the cross section of each blade section under different operating conditions. The distance between free streamlines at the wake formed by the airflow passing through the cross section of each blade section and the free velocity at the flow separation point of the cross section of each blade section were also obtained. The vortex shedding frequency of each blade section under different operating conditions is calculated based on the corrected Strauhal number, the distance between free streamlines in the wake formed by the airflow passing through the cross section of each blade section, and the free velocity at the flow separation point of each blade section.

5. The computational method of claim 4, wherein, The vortex shedding frequency of each blade section under different operating conditions is calculated using the following formula: Universal Sr = f D' / Us Formula (2); Where Universal Sr represents the corrected Strouhal number, f represents the vortex shedding frequency, Us represents the free velocity at the flow separation point in the cross section of the blade section, and D' represents the distance between free streamlines in the wake formed by the airflow passing through the cross section of the blade section.

6. The computational method of claim 1, wherein, The steps for calculating the vortex shedding frequency of each blade section under different wind speeds or operating conditions specifically include: Construct the target model; The cross section of each blade segment is input into the target model to obtain the vortex shedding frequency of each blade segment under different operating conditions.

7. The computational method of claim 6, wherein, The step of inputting the cross section of each blade segment into the target model to obtain the vortex shedding frequency of each blade segment under different operating conditions specifically includes: The geometric model of the wind turbine blade is input into the target model to determine the computational domain and boundary conditions; The computational domain is divided into grids and its parameters are set. The motion of the fan blades in the flow field is realized by using dynamic mesh technology and developing a UDF program; The vortex-induced vibration of the wind turbine blades was simulated under different wind speeds and angles of attack. The simulation results were extracted and calculated to obtain the vortex shedding frequency of each blade section under different operating conditions.

8. The computational method of claim 1, wherein, The step of comparing the vortex shedding frequency of each blade section under different wind speeds or operating conditions with the natural frequency to determine the vortex-induced vibration region of the wind turbine blade further includes: Obtain the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region; The final vortex-induced vibration region of the wind turbine blade is determined based on the mode shape amplitude, frequency, and wind speed corresponding to the vortex-induced vibration region.

9. The calculation method according to claim 1, characterized in that, The natural frequencies of the wind turbine blades include the first-order natural frequency and the second-order natural frequency.

10. A computer device, characterized by It includes a memory, a processor, and a machine-executable program stored in the memory and running on the processor, wherein the processor, when executing the machine-executable program, implements the computation method according to any one of claims 1 to 9.

11. A vortex-induced device for a wind turbine blade, c h a r a c t e r i s e d in that Arranged in the vortex-induced vibration region of the wind turbine blades, the anti-vortex device includes: At least one set of tilted spoiler blocks, each set of tilted spoiler blocks including at least a first tilted spoiler block disposed at the leading edge of the wind turbine blade and at least one second tilted spoiler block disposed at the trailing edge of the wind turbine blade, wherein both the first tilted spoiler block and the second tilted spoiler block extend obliquely out of the wind turbine blade; and At least one set of spanwise spoilers, each set of the spanwise spoilers includes at least one first spanwise spoiler arranged at the leading edge of the wind turbine blade and at least one second spanwise spoiler arranged at the trailing edge of the wind turbine blade, wherein the first spanwise spoiler and the second spanwise spoiler are both arranged along the extension direction of the wind turbine blade.

12. The anti-vortex device according to claim 11, characterized in that, The number of inclined baffle blocks is multiple, and the number of spanwise baffle strips is multiple. The multiple sets of inclined baffle blocks and multiple sets of spanwise baffle strips are arranged alternately along the extension direction of the wind turbine blades.

13. The anti-vortex device according to claim 12, characterized in that, In each group of inclined baffle blocks, the first inclined baffle block and the second inclined baffle block are inclined toward the tip of the wind turbine blade or toward the root of the wind turbine blade.

14. The anti-vortex device according to claim 13, characterized in that, In the multiple sets of tilted spoiler blocks, the tilting direction of the first tilted spoiler block is the same, and the tilting direction of the second tilted spoiler block is the same.

15. The anti-vortex device according to claim 13, characterized in that, In two adjacent groups of inclined spoiler blocks, the first inclined spoiler block has an opposite tilt direction, and the second inclined spoiler block has an opposite tilt direction.

16. The anti-vortex-induced device according to claim 13, characterized in that, In each group of tilted baffle blocks, the first tilted baffle block is arranged on the pressure side or suction side of the wind turbine blade, and the second tilted baffle block is arranged on the opposite side to the first tilted baffle block.

17. The anti-vortex device according to claim 16, characterized in that, In the multiple sets of tilted turbulence block groups, the first tilted turbulence block is arranged on the pressure side or the suction side of the fan blade.

18. The anti-vortex device according to claim 12, characterized in that, In each group of spanwise deflectors, the first spanwise deflector is arranged on the pressure side or suction side of the wind turbine blade, and the second spanwise deflector is arranged on the side opposite to the first spanwise deflector.

19. The anti-vortex-induced device according to claim 18, characterized in that, In two adjacent groups of spanwise deflector strips, the first spanwise deflector strips in the two groups are respectively arranged on the pressure side and the suction side of the wind turbine blade.

20. The anti-vortex device according to claim 12, characterized in that, In each group of spanwise spoilers, both the first spanwise spoiler and the second spanwise spoiler extend beyond the wind turbine blades.

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