Vortex-induced vibration suppression unit, device and method for blades of wind generating set

Abstract

The invention discloses a wind generating set 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 an inner cavity of a blade shell, the vibration suppression accessory is pasted to the suction face of the blade shell, a cavity is formed in the vibration suppression accessory, and the connecting pipe is connected with the synthetic jet exciter. An air inlet hole is formed in the lower surface of the connecting pipe, at least one rectifying unit is arranged on the upper surface of the connecting pipe, the rectifying unit is composed of an air outlet hole and a vortex generator which are matched with each other, and the air inlet hole and the air outlet hole are communicated with the cavity; and the other end penetrates through the suction surface of the blade shell and is connected with the air inlet of the suppression accessory. Through the vibration suppression unit attached to the surface of the blade, the flowing state of the surface of the blade is improved, vibration of the blade can be effectively suppressed, the blade does not need to be dismantled during normal operation, simpleness and high efficiency are achieved, and the dismantling time and the labor cost are effectively saved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a vortex-induced vibration suppression unit, device and method for blades of a wind generator set. Background Art

[0002] During the installation or shutdown of the wind turbine, the unit is in a power-off state, and the yaw and pitch control cannot be performed. Under certain working conditions, vortices will appear when air flows through the blades. When the vortex shedding frequency is close to the blade's natural frequency, the blade will resonate, causing damage to the blade and shortening its service life.

[0003] There are usually two existing methods for preventing vortex-induced vibration: 1. Install a backup power supply on the wind turbine to power the wind turbine (usually a diesel generator), perform yaw to the wind or pitch control, and thus change the flow state on the blade surface. This method has high equipment costs. After the unit is powered off, the diesel generator needs to be started manually. When multiple units are powered off, it cannot respond in time, and the workload is large. 2. Change the flow conditions on the blade surface by installing spoiler strips and anti-vibration mesh sleeves. This method is usually used during the lifting of the blades. The spoiler strips and anti-vibration mesh sleeves are installed on the blades. After the installation is completed, they are lifted together with the blades and removed before grid-connected operation. When the power is off during shutdown, a hanging basket or other methods are required for installation. The installation is more difficult and the construction period is long.

[0004] Therefore, there is an urgent need for a device and method for suppressing vortex-induced vibration of a wind turbine generator set that is efficient, fast-response, and highly applicable. Summary of the invention

[0005] The first purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a vortex-induced vibration suppression unit for blades of a wind turbine generator set, which can integrate the flow field on the blade surface through vortex generators and jets, change the flow state on the blade surface, and thus effectively suppress blade vibration.

[0006] A second object of the present invention is to provide a device for suppressing vortex-induced vibration of blades of a wind turbine generator set.

[0007] A third object of the present invention is to provide a method for suppressing vortex-induced vibration of blades of a wind turbine generator set.

[0008] The first purpose of the present invention is achieved through the following technical scheme: a vortex-induced vibration suppression unit for blades of a wind turbine generator set, comprising a synthetic jet exciter, a connecting pipe and a vibration suppression accessory, wherein the synthetic jet exciter is placed in the inner cavity of a blade shell, and the vibration suppression accessory is pasted on the suction surface of the blade shell. A cavity is formed inside the vibration suppression accessory, and an air inlet is provided on its lower surface, and at least one rectifying unit is provided on its upper surface. The rectifying unit is composed of an air outlet and a vortex generator that cooperate with each other, and the air inlet and the 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 thereof passes through the suction surface of the blade shell and is connected to the air inlet of the suppression accessory.

[0009] Preferably, the rectification unit consists of a group of air outlet holes and two vortex generators, and the group of air outlet holes is located between the two vortex generators.

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

[0011] Preferably, the air outlet holes between the two vortex generators are arranged in a triangle.

[0012] Preferably, the rectifier units are distributed at intervals along the length direction of the vibration suppression accessory.

[0013] The second purpose of the present invention is achieved through the following technical scheme: a device for suppressing vortex-induced vibration of blades of a wind turbine generator set, comprising a micro wind turbine generator, a lifting mechanism, a power failure monitoring device, a battery and the above-mentioned suppression unit, wherein the micro wind turbine generator is connected to the lifting mechanism, and the micro wind turbine generator is driven up and down by the lifting mechanism, the power failure monitoring device is respectively connected to the lifting mechanism, the battery and the wind turbine generator set through electrical lines, the battery is respectively connected to the micro wind turbine generator and the wind turbine generator set through electrical lines, and the suppression unit is connected to the micro wind turbine generator through a connecting line.

[0014] Preferably, the micro wind turbine is installed on the 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, a vibration suppression unit is installed on each blade of the wind turbine generator set.

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

[0019] Preferably, a plurality of vibration suppression units may be installed on each blade.

[0020] The third object of the present invention is achieved by the following technical solution: a method for suppressing vortex-induced vibration of blades of a wind turbine generator set, using the above-mentioned suppression device to effectively suppress vortex-induced vibration of blades of a wind turbine generator set, and the specific implementation process is as follows:

[0021] First, the power-off monitoring device monitors the operating status of the wind turbine generator set. When the unit is shut down and the power is cut off, the micro wind turbine generator is lifted by the lifting mechanism, and then the micro wind turbine generator starts to work to provide power to the vibration suppression unit. The suppression unit improves the flow state on the blade surface through the jet and vortex generator, thereby suppressing the vibration of the blade. When the wind turbine generator set is restored to power, the vibration suppression unit is turned off and the micro wind turbine generator is folded.

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

[0023] 1. The present invention can monitor the operating status of the wind turbine generator set by installing a power-off monitoring device. When the unit is shut down and the power is cut off, no human intervention is required and a timely response can be made to reduce the risk of vortex-induced vibration of the blades.

[0024] 2. The present invention provides electric energy for the vibration suppression unit by installing a micro wind turbine and a battery on the top of the nacelle, thereby ensuring the continuous and stable operation of the suppression unit.

[0025] 3. The present invention improves the flow state on the blade surface by attaching a vibration suppression unit to the blade surface, which can effectively suppress the vibration of the blade. When the blade is operating normally, it does not need to be removed, which is simple and efficient, and effectively saves removal time and labor costs.

[0026] 4. The air outlet holes are arranged in a triangular shape so that the airflow does not affect each other when passing through 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 group of air outlets and two symmetrical vortex generators. This design ensures that when the blade vibrates, the vortex generators and the air outlets cooperate with each other to better change the flow state on the blade surface, thereby suppressing the vortex-induced vibration of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the inhibition unit.

[0030] Figure 2 A three-dimensional diagram of the vibration suppression accessory.

[0031] Figure 3 A top view of the vibration suppression accessory.

[0032] Figure 4 One of the side views of the vibration suppression accessory.

[0033] Figure 5 This is the second side view of the vibration suppression accessory.

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

[0035] Figure 7 This is a connection diagram of the components of the suppression device.

[0036] Figure 8 Flow chart of the inhibition method. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It should be noted that when an 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 intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0040] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the terms used in this specification include any and all combinations of the relevant listed items.

[0041] Example 1

[0042] like Figures 1 to 5As shown, this embodiment discloses a vortex-induced vibration suppression unit for blades of a wind turbine generator set, including a synthetic jet exciter 61, a connecting pipe 62 and a vibration suppression attachment 63, wherein the synthetic jet exciter 61 is placed in the inner cavity of the blade shell, and the vibration suppression attachment 63 is pasted on the suction surface of the blade shell. A cavity 631 is formed inside the vibration suppression attachment 63, and an air inlet 632 is provided on its lower surface, and at least one rectifying unit is provided on its upper surface, wherein the rectifying unit is composed of a group of air outlet holes 633 and two vortex generators 634, wherein the group of air outlet holes 633 is located between the two vortex generators 634, and the two vortex generators 634 are mirror-symmetrical, which helps to ensure the uniformity of the flow field in multiple directions and reduce the flow resistance, wherein the air inlet hole 632 and the air outlet hole 633 are respectively connected to the cavity 631, and one end of the connecting pipe 62 is connected to the synthetic jet exciter 61, and the other end thereof passes through the suction surface of the blade shell and is connected to the air inlet hole 632 of the suppression attachment 63.

[0043] Specifically, the air outlet holes 633 between the two vortex generators 634 are arranged in a triangle shape, so that the airflows do not affect each other when flowing through the leading edge.

[0044] Specifically, depending on the circumstances, there may be a plurality of rectifier units, which are spaced apart and distributed along the length direction of the vibration suppression accessory.

[0045] Example 2

[0046] like Figure 6 and Figure 7 As shown, this embodiment discloses a vortex-induced vibration suppression device for blades of a wind turbine generator set, comprising 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 Example 1, wherein the micro wind turbine 1 is installed on the top of a nacelle of a wind turbine generator set 7, the micro wind turbine 1 is connected to the lifting mechanism 2 through a mechanical mechanism, and the micro wind turbine 1 is driven to move up and down by the lifting mechanism 2, the power failure monitoring device 3 is respectively connected to the lifting mechanism 2, the battery 4 and the wind turbine generator set 7 through electrical lines, the battery 4 is respectively connected to the micro wind turbine 1 and the wind turbine generator set 7 through electrical lines, and 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 vibration suppression unit 6. According to actual conditions, multiple vibration 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 blades of a wind turbine generator set, and uses the suppression device described in Example 2 to effectively suppress vortex-induced vibration of blades of a wind turbine generator set, such as Figure 8 The specific implementation process is as follows:

[0051] First, the power-off monitoring device 3 monitors the operating status of the wind turbine generator set 7. When the unit is shut down and the power is cut off, the micro wind turbine generator 1 is lifted by the lifting mechanism 2, and then the micro wind turbine generator 1 starts to work to provide power to the vibration suppression unit 6. The suppression unit 6 improves the flow state on the blade surface through the jet and vortex generator 634, thereby suppressing the vibration of the blade. When the wind turbine generator set 7 is powered on again, the vibration suppression unit 6 is turned off and the micro wind turbine generator 1 is folded.

[0052] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vortex-induced vibration suppression unit for blades of a wind turbine generator set, characterized in that: The invention comprises a synthetic jet exciter (61), a connecting pipe (62) and a vibration suppression accessory (63), wherein the synthetic jet exciter (61) is placed in the inner cavity of a blade shell, the vibration suppression accessory (63) is adhered to the suction surface of the blade shell, a cavity (631) is formed inside the vibration suppression accessory (63), an air inlet (632) is provided on the lower surface of the vibration suppression accessory (63), and at least one rectifying unit is provided on the upper surface of the vibration suppression accessory (63), wherein the rectifying unit is composed of an air outlet (633) and a vortex generator (634) which cooperate with each other, 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 thereof passes through the suction surface of the blade shell and is connected to the air inlet (632) of the suppression accessory (63).

2. A vortex-induced vibration suppression unit for wind turbine blades according to claim 1, characterized in that: The rectifying unit is composed of a group of air outlet holes (633) and two vortex generators (634), and the group of air outlet holes (633) is located between the two vortex generators (634).

3. A vortex-induced vibration suppression unit for wind turbine blades according to claim 2, characterized in that: The two vortex generators (634) are mirror-symmetrical.

4. A vortex-induced vibration suppression unit for blades of a wind turbine generator set according to claim 3, characterized in that: The air outlet holes (633) between the two vortex generators (634) are arranged in a triangle.

5. A vortex-induced vibration suppression unit for blades of a wind turbine generator set according to claim 4, characterized in that: The rectifier units are distributed at intervals along the length direction of the vibration suppression attachment.

6. A device for suppressing vortex-induced vibration of blades of a wind turbine generator set, characterized in that: The invention comprises a micro wind turbine (1), a lifting mechanism (2), a power failure monitoring device (3), a battery (4) and a suppression unit as claimed in any one of claims 1 to 5, wherein the micro wind turbine (1) is connected to the lifting mechanism (2), and the micro wind turbine (1) is driven to move up and down by the lifting mechanism (2); the power failure monitoring device (3) is respectively connected to the lifting mechanism (2), the battery (4) and the wind turbine generator set (7) through electrical lines; the battery (4) is respectively connected to the micro wind turbine (1) and the wind turbine generator set (7) through electrical lines; and the suppression unit is connected to the micro wind turbine (1) through a connecting line (5).

7. A device for suppressing vortex-induced vibration of blades of a wind turbine generator set according to claim 6, characterized in that: The micro wind generator (1) is installed on the top of the nacelle of the wind generator set (7) and is connected to the nacelle lifting mechanism (2) through a mechanical mechanism; the micro wind generator (1) is a horizontal axis wind generator with a tail rudder or a vertical axis wind generator.

8. The device for suppressing vortex-induced vibration of blades of a wind turbine generator set according to claim 6, characterized in that: Each blade of the wind power generator set (7) is equipped with a vibration suppression unit, which is installed on the suction surface of the blade shell and has an installation range of 70-90% of the blade span.

9. A device for suppressing vortex-induced vibration of blades of a wind turbine generator set according to claim 8, characterized in that: Multiple vibration suppression units are installed on each blade.

10. A method for suppressing vortex-induced vibration of blades of a wind turbine generator set, characterized in that: The suppression device according to any one of claims 6 to 9 is used to effectively suppress the vortex-induced vibration of the blades of a wind turbine generator set. The specific implementation process is as follows: First, the power failure monitoring device (3) monitors the operating state of the wind turbine generator set (7). When the wind turbine generator set is shut down and the power is cut off, the micro wind turbine generator (1) is lifted up by the lifting mechanism (2). Then, the micro wind turbine generator (1) starts to work and provides electric energy to the vibration suppression unit. The suppression unit improves the flow state on the blade surface through the jet and vortex generator (634), thereby suppressing the vibration of the blade. When the wind turbine generator set (7) is powered on again, the vibration suppression unit is turned off and the micro wind turbine generator (1) is folded up.

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