A wind turbine blade vortex-induced vibration suppression unit, device and method

Abstract

The application discloses a wind turbine blade vortex-induced vibration suppression unit, device and method, the suppression unit comprises a synthetic jet exciter, a connecting pipe and a vibration suppression accessory, the synthetic jet exciter is arranged in a cavity of a blade shell, the vibration suppression accessory is attached to a suction surface of the blade shell, a cavity is formed in the vibration suppression accessory, an air inlet hole is arranged on the lower surface of the vibration suppression accessory, and at least one flow regulation unit is arranged on the upper surface of the vibration suppression accessory, the flow regulation unit is composed of an air outlet hole and a vortex generator which cooperate with each other, the air inlet hole and the air outlet hole are communicated with the cavity respectively, one end of the connecting pipe is connected with the synthetic jet exciter, and the other end of the connecting pipe is connected with the air inlet hole of the vibration suppression accessory through the suction surface of the blade shell. The vibration suppression unit is attached to the surface of the blade, the flow state of the surface of the blade is improved, the vibration of the blade can be effectively suppressed, the vibration suppression unit does not need to be removed when the blade normally operates, the method is simple and efficient, and the removal time and the labor cost are effectively saved.

Description

Technical Field

[0001] This invention relates to the technical field of wind power generation, and in particular to a vortex-induced vibration suppression unit, device and method for wind turbine blades. Background Technology

[0002] During installation or when the wind turbine is shut down and power is lost, the unit is in a power-off state, making yaw and pitch control impossible. Under certain operating conditions, vortices may form as air flows over the blades. When the vortex shedding frequency is close to the blade's natural frequency, the blade resonates, causing damage and affecting its service life.

[0003] Existing methods for preventing vortex-induced vibration typically fall into two categories: 1. Installing a backup power source (usually a diesel generator) on the wind turbine to power the turbine, allowing for yaw or pitch adjustments to alter the flow pattern on the blade surface. This method is costly, requires manual restarting of the diesel generator after a power outage, and may not respond promptly when multiple turbines are out of power, resulting in a significant workload. 2. Modifying the flow pattern on the blade surface by installing deflectors and vibration-damping mesh. This method is typically used during blade installation, where deflectors and vibration-damping mesh are installed on the blade and hoisted together. They are removed before grid connection. During power outages, installation requires a suspended platform or other methods, making installation difficult and time-consuming.

[0004] Therefore, there is an urgent need for a highly efficient, fast-responding, and widely applicable device and method for suppressing vortex-induced vibration in wind turbine generators. Summary of the Invention

[0005] The primary objective of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a wind turbine blade vortex-induced vibration suppression unit that can integrate the flow field on the blade surface through a vortex generator and jet, thereby changing the flow state on the blade surface and effectively suppressing blade vibration.

[0006] The second objective of this invention is to provide a device for suppressing vortex-induced vibration of wind turbine blades.

[0007] The third objective of this invention is to provide a method for suppressing vortex-induced vibration of wind turbine blades.

[0008] The first objective of this invention is achieved through the following technical solution: a wind turbine blade vortex-induced vibration suppression unit, comprising a synthetic jet exciter, a connecting pipe, and a vibration suppression accessory. The synthetic jet exciter is placed inside the blade shell cavity, and the vibration suppression accessory is attached to the suction surface of the blade shell. The vibration suppression accessory has a cavity inside, with an air inlet on its lower surface and at least one rectification unit on its upper surface. The rectification unit consists of a cooperating air outlet and a vortex generator. The air inlet and air outlet are respectively connected to the cavity. One end of the connecting pipe is connected to the synthetic jet exciter, and the other end passes through the suction surface of the blade shell and is connected to the air inlet of the vibration suppression accessory.

[0009] Preferably, the rectifier unit consists of a set of air outlets and two vortex generators, with the set of air outlets located between the two vortex generators.

[0010] Preferably, the two vortex generators are mirror-symmetrical.

[0011] Preferably, the air outlets between the two vortex generators are arranged in a triangular pattern.

[0012] Preferably, the rectifier units are spaced apart along the length of the vibration damping attachment.

[0013] The second objective of this invention is achieved through the following technical solution: a wind turbine blade vortex-induced vibration suppression device, comprising a micro wind turbine, a lifting mechanism, a power failure monitoring device, a battery, and the aforementioned suppression unit. The micro wind turbine is connected to the lifting mechanism, which drives the micro wind turbine to move up and down. The power failure monitoring device is connected to the lifting mechanism, the battery, and the wind turbine via electrical lines. The battery is connected to the micro wind turbine and the wind turbine via electrical lines. The suppression unit is connected to the micro wind turbine via a connecting line.

[0014] Preferably, the micro wind turbine is installed on top of the nacelle of the wind turbine generator set.

[0015] Preferably, the micro wind turbine is connected to the lifting mechanism via a mechanical mechanism.

[0016] Preferably, the micro wind turbine is a horizontal-axis wind turbine with a tail rudder or a vertical-axis wind turbine.

[0017] Preferably, each blade of the wind turbine generator is equipped with a suppression unit.

[0018] Preferably, the suppression unit is installed on the suction surface of the blade shell, and the installation range is 70-90% of the blade span.

[0019] Preferably, each blade can be equipped with multiple suppression units.

[0020] The third objective of this invention is achieved through the following technical solution: a method for suppressing vortex-induced vibration of wind turbine blades, which utilizes the aforementioned suppression device to effectively suppress vortex-induced vibration of wind turbine blades. The specific implementation process is as follows:

[0021] First, the power outage monitoring device monitors the operating status of the wind turbine generator set. When the generator set stops and loses power, the micro wind turbine generator is raised through the lifting mechanism. Then, the micro wind turbine generator starts working to provide power to the suppression unit. The suppression unit improves the flow state on the blade surface through jet and eddy current generators, thereby suppressing blade vibration. When the wind turbine generator set is powered back on, the suppression unit is turned off and the micro wind turbine generator is retracted.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. By installing a power outage monitoring device, the present invention can monitor the operating status of wind turbine generator sets. When the generator set is shut down and power is lost, no manual intervention is required, and a timely response can be made, reducing the risk of blade vortex-induced vibration.

[0024] 2. This invention provides power to the suppression unit by installing a micro wind turbine and a battery on the top of the nacelle, thus ensuring the continuous and stable operation of the suppression unit.

[0025] 3. This invention improves the flow state on the blade surface by attaching the suppression unit to the blade surface, which can effectively suppress the vibration of the blade. Moreover, the blade does not need to be removed during normal operation, which is simple and efficient and effectively saves removal time and labor costs.

[0026] 4. The air vents are designed in a triangular arrangement so that the airflow does not interfere with each other when it flows over the leading edge.

[0027] 5. The two vortex generators of the rectifier unit are designed to be mirror-symmetrical, which helps to ensure the uniformity of the flow field in multiple directions and reduce flow resistance.

[0028] 6. The rectifier unit consists of a set of exhaust ports and two symmetrical vortex generators. This design allows the vortex generators and exhaust ports to work together to better change the flow state on the blade surface when the blade vibrates, thereby suppressing vortex-induced vibration of the blade. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the suppression unit.

[0030] Figure 2 This is a three-dimensional view of the vibration damping attachment.

[0031] Figure 3 This is a top view of the vibration damping attachment.

[0032] Figure 4 This is one of the side views of the vibration damping attachment.

[0033] Figure 5 This is the second side view of the vibration damping attachment.

[0034] Figure 6 This is a schematic diagram of the installation of the suppression device on a wind turbine generator set.

[0035] Figure 7 This is a diagram showing the connections of the various components of the suppression device.

[0036] Figure 8 This is a flowchart of the suppression method. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0040] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Furthermore, the terms used in this specification include any and all combinations of the associated listed items.

[0041] Example 1

[0042] like Figures 1 to 5As shown, this embodiment discloses a vortex-induced vibration suppression unit for wind turbine blades, including a synthetic jet exciter 61, a connecting pipe 62, and a vibration suppression attachment 63. The synthetic jet exciter 61 is placed inside the blade shell cavity, and the vibration suppression attachment 63 is attached to the suction surface of the blade shell. The vibration suppression attachment 63 has a cavity 631 formed inside, with an air inlet 632 on its lower surface and at least one rectification unit on its upper surface. The rectification unit consists of a set of air outlets 633 and two vortex generators 634. The set of air outlets 633 is located between the two vortex generators 634, which are mirror-symmetrical, helping to ensure the uniformity of the flow field in multiple directions and reduce flow resistance. The air inlet 632 and the air outlet 633 are respectively connected to the cavity 631. One end of the connecting pipe 62 is connected to the synthetic jet exciter 61, and the other end passes through the suction surface of the blade shell and is connected to the air inlet 632 of the vibration suppression attachment 63.

[0043] Specifically, the air outlets 633 between the two vortex generators 634 are arranged in a triangular pattern, so that the airflow does not affect each other when it flows over the leading edge.

[0044] Specifically, depending on the situation, there may be multiple rectifier units, which are spaced apart along the length of the vibration damping attachment.

[0045] Example 2

[0046] like Figure 6 and Figure 7 As shown, this embodiment discloses a vortex-induced vibration suppression device for wind turbine blades, including a micro wind turbine 1, a lifting mechanism 2, a power failure monitoring device 3, a battery 4, and the suppression unit 6 described in Embodiment 1. The micro wind turbine 1 is installed on the top of the nacelle of the wind turbine 7. The micro wind turbine 1 is connected to the lifting mechanism 2 through a mechanical mechanism, and the lifting mechanism 2 drives the micro wind turbine 1 to move up and down. The power failure monitoring device 3 is connected to the lifting mechanism 2, the battery 4, and the wind turbine 7 through electrical lines. The battery 4 is connected to the micro wind turbine 1 and the wind turbine 7 through electrical lines. The suppression unit is connected to the micro wind turbine 1 through a connecting line 5.

[0047] Specifically, the micro wind turbine 1 is a horizontal-axis wind turbine with a tail rudder or a vertical-axis wind turbine.

[0048] Specifically, each blade of the wind turbine generator set 7 is equipped with a suppression unit 6. Depending on the actual situation, multiple suppression units 6 can be installed on each blade. The suppression unit 6 is installed on the suction surface of the blade shell, and the installation range is 70-90% of the blade span.

[0049] Example 3

[0050] This embodiment discloses a method for suppressing vortex-induced vibration of wind turbine blades. The suppression device described in Embodiment 2 effectively suppresses vortex-induced vibration of wind turbine blades. Figure 8 As shown, the specific implementation process is as follows:

[0051] First, the power outage monitoring device 3 monitors the operating status of the wind turbine generator set 7. When the unit stops and loses power, the micro wind turbine generator 1 is raised by the lifting mechanism 2. Then, the micro wind turbine generator 1 starts to work and provides power to the suppression unit 6. The suppression unit 6 improves the flow state on the blade surface through the jet and eddy current generator 634, thereby suppressing the vibration of the blade. When the wind turbine generator set 7 is powered back on, the suppression unit 6 is turned off and the micro wind turbine generator 1 is retracted.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for suppressing vortex-induced vibration of wind turbine blades, characterized in that, The device includes a micro wind turbine (1), a lifting mechanism (2), a power outage monitoring device (3), a battery (4), and a suppression unit. The suppression unit includes a synthetic jet exciter (61), a connecting pipe (62), and a vibration damping accessory (63). The synthetic jet exciter (61) is placed inside the blade shell cavity, and the vibration damping accessory (63) is attached to the suction surface of the blade shell. The vibration damping accessory (63) has a cavity (631) inside, with an air inlet (632) on its lower surface and at least one rectification unit on its upper surface. The rectification unit consists of a cooperating air outlet (633) and a vortex generator (634). The air inlet (632) and the air outlet (633) are respectively connected to the cavity (631). One end of the connecting pipe (62) is connected to the synthetic jet exciter (61), and the other end passes through the suction surface of the blade shell and is connected to the air inlet (632) of the vibration damping accessory (63). The rectifier unit consists of a set of air outlets (633) and two eddy current generators (634). The set of air outlets (633) is located between the two eddy current generators (634). The two eddy current generators (634) are mirror symmetrical. The air outlets (633) between the two eddy current generators (634) are arranged in a triangle. The rectifier unit is distributed at intervals along the length of the vibration damping accessory. The micro wind turbine (1) is connected to the lifting mechanism (2). The lifting mechanism (2) drives the micro wind turbine (1) to move up and down. The power failure monitoring device (3) is connected to the lifting mechanism (2), the battery (4) and the wind turbine generator set (7) through electrical lines. The battery (4) is connected to the micro wind turbine (1) and the wind turbine generator set (7) through electrical lines. The suppression unit is connected to the micro wind turbine (1) through the connecting line (5).

2. The wind turbine blade vortex-induced vibration suppression device according to claim 1, characterized in that, The micro wind turbine (1) is installed on the top of the nacelle of the wind turbine generator set (7) and is connected to the lifting mechanism (2) through a mechanical mechanism; the micro wind turbine (1) is a horizontal axis wind turbine with a tail rudder or a vertical axis wind turbine.

3. The wind turbine blade vortex-induced vibration suppression device according to claim 1, characterized in that, Each blade of the wind turbine generator set (7) is equipped with a suppression unit, which is installed on the suction surface of the blade shell, and the installation range is 70-90% of the blade span.

4. The wind turbine blade vortex-induced vibration suppression device according to claim 3, characterized in that, Each blade is equipped with multiple suppression units.

5. A method for suppressing vortex-induced vibration of wind turbine blades, characterized in that, The suppression device according to any one of claims 1 to 4 effectively suppresses vortex-induced vibration of wind turbine blades. The specific implementation process is as follows: First, the power outage monitoring device (3) monitors the operating status of the wind turbine generator set (7). When the generator set stops and loses power, the micro wind turbine generator (1) is raised by the lifting mechanism (2). Then the micro wind turbine generator (1) starts to work and provides power to the suppression unit. The suppression unit improves the flow state on the blade surface through the jet and eddy current generator (634), thereby suppressing the vibration of the blade. When the wind turbine generator set (7) is powered on again, the suppression unit is turned off and the micro wind turbine generator (1) is retracted.

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