Flow separation active control noise reduction device for wind turbine blade

Abstract

The utility model belongs to the field of wind power generation, particularly relates to a flow separation active control noise reduction device for a wind turbine blade, and aims to solve the problems that when wind flow passes through the surface of a tower drum, formed alternate vortexes easily cause vortex-induced vibration, and the vibration is transmitted to the wind blade through the tower drum, so that the wind blade also vibrates, and the noise is reduced. In order to solve the problems that vibration of the wind blades affects the stability of the wind blades, and the power generation efficiency and the service life of the wind blades are possibly reduced, the following scheme is provided: the wind power generation device comprises a tower drum, a wind turbine cabin is fixedly mounted at the top end of the tower drum, and three blade bodies are fixedly arranged on the outer wall of one side of the wind turbine cabin. During use, when wind blows through the turbulent flow strips, the track of the wind is disordered, unstable turbulent flow is formed, and vortexes with stable frequency are prevented from being formed, so that noise around the tower drum is reduced, vortex-induced vibration is prevented from being easily caused by formed alternate vortexes, and vibration is prevented from being transmitted to the wind blades through the tower drum.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to an active flow separation control noise reduction device for wind turbine blades. Background Technology

[0002] During operation, wind turbine blades often experience flow separation due to the complexity of airflow and the irregularity of the blade surface. Flow separation not only reduces the efficiency of wind turbines but also generates significant noise, affecting the surrounding environment and the normal operation of equipment. Therefore, developing an effective active control noise reduction device for flow separation is of great significance for improving wind turbine performance and reducing noise pollution.

[0003] In existing wind turbine blades, the blades are often stably supported by the tower. However, during the rotation of the wind turbine blades, the alternating vortices formed when the wind flows over the surface of the tower can easily cause vortex-induced vibration. This vibration is transmitted through the tower to the blades, causing them to vibrate as well. Consequently, the vibration of the blades not only affects their stability but may also reduce their power generation efficiency and service life.

[0004] To address the aforementioned issues, this utility model document proposes an active flow separation control noise reduction device for wind turbine blades. Utility Model Content

[0005] This invention provides an active flow separation control noise reduction device for wind turbine blades, which solves the problem in the prior art where alternating vortices formed when the airflow passes over the tower surface can easily cause vortex-induced vibration, and the vibration can be transmitted to the wind turbine blades through the tower, causing the wind turbine blades to vibrate as well. As a result, the vibration of the wind turbine blades not only affects their stability, but may also reduce their power generation efficiency and service life.

[0006] This utility model provides the following technical solution:

[0007] Active flow separation control noise reduction device for wind turbine blades, including:

[0008] The tower has a wind turbine nacelle fixedly installed at its top. Three blade bodies are fixedly installed on one side of the outer wall of the wind turbine nacelle, and a serrated flap is fixedly installed on the outer side of each blade body.

[0009] The turbulence-disrupting mechanism, installed on the outer wall of the tower, is used to disrupt the wind's trajectory and prevent the formation of stable vortices.

[0010] In one possible design, the aerodynamic mechanism includes a pull rope, a deflector strip, a screw, and a limiting ring. The pull rope is disposed on the outer wall of the tower, and multiple deflector strips are fixedly installed on the pull rope. Each deflector strip is in the shape of a triangular prism.

[0011] In one possible design, the two screws are respectively fixedly disposed at both ends of the pull rope, and each of the limiting rings is fixedly disposed on the outer wall of the screw to limit the screw.

[0012] In one possible design, a fixing ring is fixedly provided on the top outer wall of the tower, and a first retaining ring and a second retaining ring are provided on the bottom outer wall of the tower. The bottom side of the fixing ring and the top side of the first retaining ring are both provided with through holes for the screw to pass through. Each screw has a locking nut threadedly connected to its outer wall for locking and fixing the screw.

[0013] In one possible design, the outer walls of the first retaining ring and the second retaining ring are each fixed with two connecting plates. The four connecting plates are divided into two groups, and each group of connecting plates is connected and fixed by fasteners. Each group of fasteners consists of bolts and nuts.

[0014] In one possible design, a noise reduction plate is fixedly installed on the outer side of each blade body, and multiple air passage holes are opened on one side of the noise reduction plate.

[0015] In this application, during use, the tower first serves as the support structure for the wind turbine, with the wind turbine nacelle fixedly installed at its top. The nacelle contains key components such as the wind turbine's transmission system and generator. Three blade bodies are fixedly installed on one outer wall of the wind turbine nacelle. The blade bodies are the main components of the wind turbine that capture wind energy and convert it into mechanical energy. Each blade body has a serrated flap fixedly installed on its outer side. The design of the serrated flap helps to form turbulence at the edge of the blade body, reducing flow separation and thus reducing noise. Next, the pull rope is arranged along the outer wall of the tower, and multiple deflector strips are fixedly installed on the pull rope. Since the deflector strips are all triangular prisms and made of plastic foam, when the wind blows over the deflector strips, the wind trajectory will be disrupted, forming unstable turbulence and preventing the formation of stable frequency vortices. This reduces noise around the tower and prevents the alternating vortices from easily causing vortex-induced vibration. It also prevents vibration from being transmitted through the tower to the wind blades, causing the wind blades to vibrate as well, further enhancing the stability of the wind blades and improving power generation efficiency and service life.

[0016] Next, screws are fixed at both ends of the pull rope to secure it and the deflector strip to the tower. The limiting rings on the outer wall of the screw help to limit its movement, preventing loosening or displacement during use. Simultaneously, they can be tightened and fixed by engaging with the locking nut. Utilizing the fixing rings, first retaining ring, and second retaining ring on the outer wall of the tower, with through holes for the screw to pass through, the screw is locked in place by the locking nut after passing through the through holes. This ensures the stability of the pull rope and deflector strip, facilitating installation, fixing, and quick disassembly. Two connecting plates are fixedly installed on the outer walls of both the first and second retaining rings. The connecting plates are connected and fixed by fasteners consisting of bolts and nuts, so that the first and second retaining rings can be installed and fixed on the tower. They are also easy to disassemble, which improves convenience. The noise reduction plate fixed on the outer side of each blade body, through multiple air passages of the noise reduction plate, helps to further reduce the noise generated by the blade body during operation. These multiple air passages allow air to pass through, and at the same time, they use the acoustic characteristics of the holes to absorb and scatter noise, thereby achieving the noise reduction effect.

[0017] In this utility model, the active control noise reduction device for flow separation of wind turbine blades, through the turbulence mechanism, can disrupt the wind trajectory when the wind blows over the turbulence strip, forming unstable turbulence, preventing the formation of vortices with stable frequency, thereby reducing noise around the tower and preventing the alternating vortices from easily causing vortex-induced vibration.

[0018] In this invention, the active control noise reduction device for flow separation of wind turbine blades, through the setting of serrated flaps, noise reduction plates and air vents, helps to form turbulence at the edge of the blade body, reduce flow separation, thereby reducing noise, and also helps to further reduce the noise generated by the blade body during operation.

[0019] In this invention, when the wind blows over the spoiler strip, the wind trajectory is disrupted, forming unstable turbulence, preventing the formation of stable frequency vortices, thereby reducing noise around the tower, preventing the alternating vortices from easily causing vortex-induced vibration, and avoiding the vibration from being transmitted through the tower to the wind blades, causing the wind blades to also vibrate, further enhancing the stability of the wind blades, improving power generation efficiency and service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the active flow separation control and noise reduction device for wind turbine blades provided in an embodiment of the present invention.

[0021] Figure 2 A schematic diagram of the blade body structure of the flow separation active control noise reduction device for wind turbine blades provided in this embodiment of the present invention;

[0022] Figure 3 This is one of the schematic diagrams of the disassembled state structure of the turbulence mechanism of the active control noise reduction device for flow separation of wind turbine blades provided in this embodiment of the present invention;

[0023] Figure 4 This is the second schematic diagram of the turbulence mechanism in the split state of the active control noise reduction device for flow separation of wind turbine blades provided in this embodiment of the present invention.

[0024] Figure label:

[0025] 1. Tower; 2. Wind turbine nacelle; 3. Blade body; 4. Serrated flap; 5. Noise reduction plate; 6. Air vent; 7. Cable; 8. Deflector strip; 9. Fixing ring; 10. Through hole; 11. Screw; 12. Limiting ring; 13. Locking nut; 14. Fastener; 15. First retaining ring; 16. Second retaining ring; 17. Connecting plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Please refer to Figures 1-4 Noise reduction device, including:

[0029] The tower 1 has a wind turbine nacelle 2 fixedly installed at its top. Three blade bodies 3 are fixedly installed on one side of the outer wall of the wind turbine nacelle 2. The nacelle contains key components such as the wind turbine's transmission system and generator. The blade body 3 is the main component of the wind turbine that captures wind energy and converts it into mechanical energy. A serrated flap 4 is fixedly installed on the outer side of each blade body 3. The design of the serrated flap 4 helps to form turbulence at the edge of the blade body 3, reduce flow separation, and thus reduce noise.

[0030] A turbulence-disrupting mechanism is installed on the outer wall of the tower 1 to disrupt the wind's trajectory and prevent the formation of stable-frequency vortices. The turbulence-disrupting mechanism includes a pull rope 7, turbulence-disrupting strips 8, a screw 11, and a limiting ring 12. The pull rope 7 is installed on the outer wall of the tower 1, and multiple turbulence-disrupting strips 8 are fixedly installed on the pull rope 7. Each turbulence-disrupting strip 8 is triangular in shape. The pull rope 7 is arranged along the outer wall of the tower, and multiple turbulence-disrupting strips 8 are fixedly installed on the pull rope 7. Since the turbulence-disrupting strips 8 are triangular in shape and made of plastic foam, the wind's trajectory will be disrupted when the wind blows over the turbulence-disrupting strips 8, forming unstable turbulence and preventing the formation of stable-frequency vortices, thereby reducing noise around the tower 1.

[0031] Two screws 11 are fixedly installed at both ends of the pull rope 7. Each limiting ring 12 is fixedly installed on the outer wall of the screw 11 to limit the screw 11. The screws 11 are fixedly installed at both ends of the pull rope 7 to fix the pull rope 7 and the baffle strip 8 to the tower 1. The limiting rings 12 fixed on the outer wall of the screw 11 help to limit the screw 11 and prevent it from loosening or shifting during use. At the same time, they can be tightened and fixed by cooperating with the locking nut 13.

[0032] A fixing ring 9 is fixedly installed on the top outer wall of the tower 1, and a first retaining ring 15 and a second retaining ring 16 are installed on the bottom outer wall of the tower 1. The bottom side of the fixing ring 9 and the top side of the first retaining ring 15 are provided with through holes 10 for the screw 11 to pass through. Each screw 11 is threaded with a locking nut 13 on its outer wall for locking and fixing the screw 11. Through the through holes 10 on these rings for the screw 11 to pass through, the screw 11 is locked and fixed by the locking nut 13 after passing through the through holes 10, thereby ensuring the stability of the pull rope 7 and the deflector 8, so as to facilitate installation, fixing and quick disassembly.

[0033] The outer walls of the first retaining ring 15 and the second retaining ring 16 are each fixed with two connecting plates 17. The four connecting plates 17 are divided into two groups. Each group of connecting plates 17 is connected and fixed by fasteners 14. Each group of fasteners 14 consists of bolts and nuts. The connecting plates 17 are connected and fixed by fasteners 14 consisting of bolts and nuts, so that the first retaining ring 15 and the second retaining ring 16 can be installed and fixed on the tower 1. At the same time, it is also easy to disassemble and improves convenience.

[0034] This application can be used in the field of wind power generation, or in other fields applicable to this application.

[0035] Example 2

[0036] refer to Figure 1 and Figure 2 An improvement based on Example 1: an active flow separation control noise reduction device for wind turbine blades, which is applied to the field of wind power generation;

[0037] Each blade body 3 is fixedly equipped with a noise reduction plate 5 on its outer side. Multiple air passage holes 6 are opened on one side of the noise reduction plate 5. The diameter of the air passage holes 6 is 3-10mm and the spacing is 10-35mm. This helps to further reduce the noise generated by the blade body 3 during operation. These multiple air passage holes 6 allow air to pass through, and at the same time, they use the acoustic characteristics of the holes to absorb and scatter noise, thereby achieving the effect of noise reduction.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations, but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A flow separation active control noise reduction device for wind turbine blades, characterized in that, include: The tower (1) has a wind turbine nacelle (2) fixedly installed at the top of the tower (1). Three blade bodies (3) are fixedly installed on one side of the outer wall of the wind turbine nacelle (2). A serrated flap (4) is fixedly installed on the outer side of each blade body (3). The turbulence mechanism is set on the outer wall of the tower (1) to disrupt the wind trajectory and prevent the formation of a stable frequency vortex. The turbulence mechanism includes a pull rope (7), turbulence strips (8), screws (11) and limiting rings (12). The pull rope (7) is set on the outer wall of the tower (1). Multiple turbulence strips (8) are fixedly installed on the pull rope (7). Each turbulence strip (8) is in the shape of a triangular prism.

2. The active flow separation control and noise reduction device for wind turbine blades according to claim 1, characterized in that, The two screws (11) are fixedly installed at both ends of the pull rope (7), and each limiting ring (12) is fixedly installed on the outer wall of the screw (11) to limit the screw (11).

3. The active flow separation control and noise reduction device for wind turbine blades according to claim 2, characterized in that, A fixing ring (9) is fixedly provided on the top outer wall of the tower (1), and a first retaining ring (15) and a second retaining ring (16) are provided on the bottom outer wall of the tower (1). A through hole (10) for the screw (11) to pass through is provided on the bottom side of the fixing ring (9) and the top side of the first retaining ring (15). A locking nut (13) is threadedly connected to the outer wall of each screw (11) for locking and fixing the screw (11).

4. The active flow separation control and noise reduction device for wind turbine blades according to claim 3, characterized in that, The outer walls of the first retaining ring (15) and the second retaining ring (16) are each fixedly provided with two connecting plates (17). The four connecting plates (17) are in two groups. Each group of connecting plates (17) is connected and fixed by fasteners (14). Each group of fasteners (14) consists of bolts and nuts.

5. The active flow separation control and noise reduction device for wind turbine blades according to claim 1, characterized in that, Each blade body (3) is fixedly provided with a noise reduction plate (5) on its outer side, and a plurality of air passage holes (6) are provided on one side of the noise reduction plate (5).

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