Blade noise reduction device, and blade

Abstract

A blade noise reduction device (100), the blade noise reduction device (100) comprising a connecting main body (10) and sawtooth units (20). The connecting main body (10) is provided with a plurality of protrusions (11) and recesses (12) which are alternately distributed in a first direction (X). The plurality of sawtooth units (20) are connected to one end of the connecting main body (10) in a second direction (Y), and the sawtooth units (20) are arranged in the first direction (X). In the second direction (Y), the sawtooth units (20) and the recesses (12) are arranged so as to correspond to each other on a one-to-one basis, at least part of the orthographic projection of each protrusion (11) is located between two adjacent sawtooth units (20) and protrudes from the orthographic projections of the sawtooth units (20), and the second direction (Y) intersects the first direction (X). The blade noise reduction device can significantly reduce aerodynamic noises generated by a blade. Further provided is a blade.

Description

Blade noise reduction device and blade

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411786336.5, filed on December 5, 2024, entitled “Blade Noise Reduction Device, Blade and Wind Turbine Generator,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of wind power generation technology, and in particular relates to a blade noise reduction device and a blade. Background Technology

[0004] As the capacity of wind turbine generators increases, the required blade lengths also grow. This leads to a significant increase in radiated noise from the blades. For megawatt-class wind turbine generators, the noise primarily originates from the aerodynamic noise of the blades, especially the trailing edge noise of the turbulent boundary layer. Therefore, the development of noise-reducing accessories with significant noise reduction effects is crucial, and serrated trailing edges are currently the most widely used noise-reducing accessory for blades. However, research results indicate that the existing serrated trailing edges have unsatisfactory noise reduction effects, with very limited reduction and even rebound noise at high wind speeds, sometimes exceeding the noise level without serrated trailing edges.

[0005] Therefore, there is an urgent need for a blade noise reduction device and corresponding blades that can reduce aerodynamic noise. Summary of the Invention

[0006] This application provides a blade noise reduction device and a blade, wherein the blade noise reduction device can significantly reduce noise.

[0007] In a first aspect, embodiments of this application provide a blade noise reduction device, comprising: a connecting body having a plurality of protrusions and grooves alternately distributed along a first direction; a serrated unit having a plurality of serrated units connected to one end of the connecting body in a second direction, the serrated units being arranged along the first direction; wherein, along the second direction, each serrated unit is respectively provided with a corresponding groove, the orthographic projection of the protrusion is at least partially located between two adjacent serrated units and protrudes beyond the orthographic projection of the serrated unit, the second direction intersecting the first direction.

[0008] According to one aspect of the embodiments of this application, along the second direction, the maximum length dimension of the sawtooth unit is H, and the maximum length dimension of the groove is L, wherein L≤3H.

[0009] According to one aspect of the embodiments of this application, the maximum length dimension of the sawtooth unit is H along the second direction, and the distance between the highest point and the lowest point of the protrusion is A along the third direction, wherein H / 100≤A≤H / 5, and the first direction, the second direction and the third direction intersect each other.

[0010] According to one aspect of the embodiments of this application, the groove wall that encloses and forms the groove has a polygonal orthographic projection along a third direction, and the first direction, the second direction and the third direction are arranged to intersect each other.

[0011] According to one aspect of the embodiments of this application, the orthographic projection of the groove wall forming the groove along a third direction is an axisymmetric figure with a first axis of symmetry, and along the third direction, the orthographic projection of the tooth tip of the sawtooth unit is placed on the first axis of symmetry, and the lowest point of the groove in the third direction is located on the first axis of symmetry.

[0012] According to one aspect of the embodiments of this application, along the second direction and from the connecting body to the side of the sawtooth unit, the groove width in the first direction first increases and then decreases.

[0013] According to one aspect of the embodiments of this application, along a first direction, the maximum width of each groove is equal to the width of the oppositely arranged sawtooth unit, and every two adjacent grooves are connected at the maximum width position.

[0014] According to one aspect of the embodiments of this application, every two adjacent grooves are connected at the maximum width position point, and along the second direction, the vertical distance between the maximum width position point of connection and the tooth root of the sawtooth unit is S, and the maximum length dimension of the sawtooth unit is H, wherein S≤H.

[0015] According to one aspect of the embodiments of this application, along the second direction and from the connecting body to the sawtooth unit, the width of the protrusion in the first direction gradually decreases, and the height in the third direction gradually decreases, with the first direction, the second direction and the third direction intersecting each other.

[0016] According to one aspect of the embodiments of this application, the orthographic projection of the protrusion in the third direction has an axisymmetric structure with a second axis of symmetry, two adjacent grooves are symmetrically distributed with respect to the second axis of symmetry, and two adjacent sawtooth units are symmetrically distributed with respect to the second axis of symmetry.

[0017] According to one aspect of the embodiments of this application, each protrusion includes a first surface and a second surface that are connected together, and the groove wall of each groove includes a third surface and a fourth surface that are connected together; wherein, the side of the third surface away from the fourth surface is connected to the adjacent second surface to form a first boundary line, and the side of the fourth surface away from the third surface is connected to the adjacent first surface to form a second boundary line, and the first boundary line and the second boundary line are symmetrically arranged in a second direction.

[0018] According to one aspect of the embodiments of this application, two adjacent protrusions are connected in a first direction, and along a second direction, the orthographic projection line of a plurality of protrusions extends in a broken line trajectory or in a curved trajectory.

[0019] In a second aspect, embodiments of this application provide a blade, comprising: a blade body having a leading edge and a trailing edge disposed opposite to each other in a second direction, the blade body having a windward surface and a leeward surface disposed opposite to each other in a third direction, the second direction and the third direction being intersecting each other; and a blade noise reduction device as described in any embodiment of the first aspect, disposed at the trailing edge, with at least one of the windward surface and the leeward surface connected to the blade noise reduction device.

[0020] The blade noise reduction device provided in this application includes a connecting body and multiple serrated units connected to the connecting body. The connecting body has multiple grooves and multiple protrusions. The serrated units are arranged along a second direction with the connecting body. In this second direction, each serrated unit has a corresponding groove. The orthographic projection of the protrusion is at least partially located between two adjacent serrated units and protrudes beyond the orthographic projection of the serrated unit. This allows the airflow passing through the connecting body to have a flow trajectory closer to the central axis of each serrated unit, thereby helping to guide eddies in the air and achieving a better noise reduction effect. Attached Figure Description

[0021] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0022] Figure 1 is a schematic diagram of the structure of a blade noise reduction device provided in an embodiment of this application;

[0023] Figure 2 is a schematic diagram of the structure of a blade noise reduction device provided in another embodiment of this application;

[0024] Figure 3 is a schematic diagram of the structure of a blade noise reduction device provided in another embodiment of this application;

[0025] Figure 4 is a schematic diagram of the structure of a blade noise reduction device provided in another embodiment of this application;

[0026] Figure 5 is a schematic diagram of the blade structure provided in an embodiment of this application;

[0027] Figure 6 is a schematic diagram of the structure of a wind turbine generator set provided in an embodiment of this application.

[0028] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0029] in:

[0030] 100 - Blade noise reduction device; 200 - Blade; 300 - Wind turbine generator set;

[0031] 10 - Connecting body; 20 - Serrated unit; 30 - Leading edge; 40 - Trailing edge;

[0032] 11-Protrusion; 12-Groove;

[0033] 111 - First surface; 112 - Second surface; 121 - Third surface; 122 - Fourth surface;

[0034] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0035] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0036] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the molding die and molding method of this application. It should also be noted that, unless otherwise explicitly specified and limited, "multiple" means two or more, and the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. The terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application 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 limitations on this application. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0038] With the development of wind power generation technology, the number of existing wind turbine generators is gradually increasing. With the widespread application of distributed turbines, the minimum distance between wind turbine generator installation locations and residential areas is gradually decreasing. Simultaneously, with the development of technology towards larger single-unit sizes, the single-unit capacity of wind turbine generators is continuously increasing, as are their blade lengths and rotational speeds, leading to a gradual increase in noise during wind turbine generator operation.

[0039] Based on this, the applicant found that the noise reduction methods used in existing wind turbine blades usually include setting serrated structures at the trailing edge of the blade, but the existing serrated structures have poor control over the flow pattern of gas at the trailing edge of the blade and low control stability.

[0040] To address the aforementioned issues, this application provides a blade noise reduction device, a blade, and a wind turbine generator set. By adjusting the flow trajectory of the airflow passing through the blade noise reduction device, the vortex at the blade edge is further diverted, thereby improving the noise reduction effect.

[0041] It is understood that the following embodiments of this application are only used as an example of applying the blade noise reduction device to wind turbine blades. However, the application of the blade noise reduction device provided in the embodiments of this application is not limited to the following embodiments. It can also be used in other occasions where aerodynamic noise needs to be reduced and protected.

[0042] To better understand this application, a detailed description is provided below with reference to Figures 1 to 6.

[0043] Please refer to Figures 1 to 4 together. Figure 1 is a schematic diagram of the structure of a blade noise reduction device provided in one embodiment of this application. Figure 2 is a schematic diagram of the structure of a blade noise reduction device provided in another embodiment of this application. Figure 3 is a schematic diagram of the structure of a blade noise reduction device provided in yet another embodiment of this application. Figure 4 is a schematic diagram of the structure of a blade noise reduction device provided in yet another embodiment of this application.

[0044] In a first aspect, embodiments of this application provide a blade noise reduction device 100, comprising: a connecting body 10, having a plurality of protrusions 11 and grooves 12 alternately distributed along a first direction X; and serrated units 20, wherein a plurality of serrated units 20 are connected to one end of the connecting body 10 in a second direction Y, and each serrated unit 20 is arranged along the first direction X; wherein, along the second direction Y, each serrated unit 20 is respectively provided with a groove 12, and the orthographic projection of the protrusion 11 is at least partially located between two adjacent serrated units 20 and protrudes beyond the orthographic projection of the serrated unit 20, and the second direction Y intersects with the first direction X.

[0045] This application first provides a blade noise reduction device 100 (hereinafter referred to as the noise reduction device), including a connecting body 10 and sawtooth units 20, which are interconnected and optionally integrally formed to give the whole device high structural strength. The connecting body 10 extends at least partially along a first direction X, and a plurality of sawtooth units 20 are arranged along the first direction X and connected to one side of the connecting body 10 in a second direction Y. The plurality of sawtooth units 20 may have the same shape and size and are connected to each other in the first direction X to facilitate processing and to give the device a good noise reduction effect. The first direction X and the second direction Y may be perpendicular to each other.

[0046] The connecting body 10 has a plurality of alternating protrusions 11 and grooves 12 along its first extending direction X. These protrusions 11 and grooves 12 can be arranged alternately. Each protrusion 11 can have the same or similar shape, size and position. Specifically, if each protrusion 11 is orthographically projected along the first direction X, the resulting orthographic projections can overlap. The arrangement of the grooves 12 is similar to that of the protrusions 11, and will not be described again here.

[0047] Optionally, the shape of the groove 12 can be circular, elliptical, or polygonal, and the shape of the protrusion 11 can be pyramidal, hemispherical, or semi-ellipsoidal.

[0048] It is understandable that the alternating arrangement of protrusions 11 and grooves 12 along the first direction X means that when both grooves 12 and protrusions 11 are orthographically projected along the second direction Y, the orthographic projection of each protrusion 11, except for those located at the edges, is at least partially located between the orthographic projections of two adjacent grooves 12, and the orthographic projection of each groove 12 is at least partially located between the orthographic projections of two adjacent protrusions 11. When both are orthographically projected along the first direction X, the orthographic projections of protrusions 11 and grooves 12 can overlap, partially overlap, or be completely offset.

[0049] Furthermore, on the side surface of the noise reduction device where the protrusion 11 and the groove 12 are provided, the protrusion 11 protrudes from the surface of the sawtooth unit 20, and the groove 12 may be recessed relative to the protrusion 11. Optionally, the groove 12 may be recessed relative to the surface of the sawtooth unit 20 or flush with the surface of the sawtooth unit 20 to adjust the flow direction of the airflow passing through the connecting body 10. The other side surface opposite to the protrusion 11 and the groove 12 may be a plane, conform to the shape of the blade 200 to be connected, or have a concave-convex structure corresponding to the protrusion 11 and the groove 12. This application does not impose specific limitations on this comparison.

[0050] Projecting the entire noise reduction device along the second direction Y, the projection of the protrusion 11 lies between the projections of two adjacent sawtooth units 20, and the projection of the groove 12 at least partially overlaps with the projection of the sawtooth unit 20. Thus, along the second direction Y, the position of the groove 12 corresponds to the position of the sawtooth unit 20. Taking the sawtooth unit 20 as an isosceles triangle as an example, the axis of symmetry of the sawtooth unit 20 can pass through the center of the groove 12 where the depth is greatest. Correspondingly, the protrusions 11, alternating with the grooves 12, are positioned in the intervals between the sawtooth units 20.

[0051] By providing a protrusion 11 and a groove 12 on the connecting body 10, and positioning the groove 12 directly opposite the sawtooth unit 20, the flow direction of the airflow passing through the noise reduction device can be further adjusted. When the airflow flows through the noise reduction device in the direction from the connecting body 10 to the sawtooth unit 20, the protrusion 11 can divert the airflow, allowing more airflow to flow past both sides of the protrusion 11, while the groove 12 can concentrate the airflow, allowing more airflow to flow past the path near the center of the groove 12. This adjusts the flow direction of the airflow, directing it towards the tip of the sawtooth unit 20. Referring to Figure 4, flow direction A in Figure 4 represents the airflow direction without the protrusion 11 and groove 12, while flow direction B represents the airflow direction at the noise reduction device in this embodiment. Thus, by providing the noise reduction device, the distance between the airflow path and the sawtooth unit 20 can be increased, resulting in more uniform gas mixing and effectively improving the noise reduction effect.

[0052] In some alternative embodiments, along the second direction Y, the maximum length dimension of the sawtooth unit 20 is H, and the maximum length dimension of the groove 12 is L, wherein L≤3H.

[0053] Along the second direction Y connecting the main body 10 and the sawtooth unit 20, the maximum length of the sawtooth unit 20 is denoted as Hmm, and the extension dimension of the groove 12 is denoted as Lmm. It can be understood that the second direction Y is considered to be perpendicular to the first direction X. The maximum length here refers to the length of the orthographic projection of the groove 12 and the sawtooth unit 20 along the first direction X in the second direction Y.

[0054] Furthermore, the maximum length L of the groove 12 can be less than or equal to three times the maximum length H of the serrated unit 20, i.e., L≤3H. In embodiments where the connecting body 10 has a larger extension dimension along the second direction Y, the extension dimension of the groove 12 can be increased accordingly, and its dimension in the first direction X can be designed according to the width of the serrated unit 20 and the setting position of the protrusion 11.

[0055] By limiting the size of the groove 12 to the aforementioned range, it is possible to reduce the possibility that the installation space required for the noise reduction device is too large due to the excessive length of the groove 12, and at the same time reduce the possibility that the airflow gathering effect will decrease due to the excessive length.

[0056] In some alternative embodiments, the maximum length dimension of the sawtooth unit 20 is H along the second direction Y, and the distance between the highest and lowest points of the protrusion 11 is A along the third direction Z, wherein H / 100≤A≤H / 5, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0057] Similar to the aforementioned length dimension limitation, the maximum length dimension of the sawtooth unit 20 in the second direction Y is denoted as H, and the extension dimension of the protrusion 11 in the third direction Z, i.e., the thickness direction of the noise reduction device, is denoted as A. It can be understood that the dimension of the protrusion 11 here refers to the extension dimension from the top of the protrusion 11 to the root of the protrusion 11, which can be optionally the dimension by which the top of the protrusion 11 protrudes beyond the sawtooth unit 20. Optionally, the first direction X, the second direction Y, and the third direction Z can be arranged perpendicularly to each other.

[0058] Based on this, the size A of the protrusion 11 is set to be between H / 100 and H / 5. By limiting the protrusion size of the protrusion 11, the possibility that the protrusion 11 is too low and the diversion effect on the airflow is not obvious can be reduced. At the same time, the possibility that the protrusion 11 is too high and the cost increases, as well as the possibility that it will obstruct the airflow too much and be impacted can be reduced.

[0059] In some optional embodiments, the groove wall that encloses the groove 12 is polygonal in the orthographic projection along the third direction Z, and the first direction X, the second direction Y and the third direction Z are arranged to intersect each other.

[0060] Optionally, when setting the groove 12, the groove wall enclosing the groove 12 can be set as a polygon to facilitate processing and connection with the protrusion 11. For example, the groove 12 may include multiple polygonal wall portions, which are joined together to form the groove 12. Along the third direction Z, the overall orthographic projection of the groove wall can be polygonal, and by adjusting the included angles between the individual wall portions, the area with the greatest recess depth of the groove 12 is formed at the junction between adjacent wall portions.

[0061] By setting the groove 12 as a polygon, it is easy to set the groove wall as multiple interlocking walls. At the same time, setting the groove wall as a polygon makes it easier to control the flow direction of the airflow passing through it. While making the flow direction closer to the recess of the groove 12, the flow direction can be further adjusted by the extended square of the boundary line between adjacent walls, thereby further improving the noise reduction effect.

[0062] In some alternative embodiments, the orthographic projection of the groove wall forming the groove 12 along the third direction Z is an axisymmetric figure with a first axis of symmetry, and the orthographic projection of the tooth tip of the sawtooth unit 20 along the third direction Z is placed on the first axis of symmetry, and the lowest point of the groove 12 in the third direction Z is located on the first axis of symmetry.

[0063] As previously described, the groove 12 and the sawtooth unit 20 in the noise reduction device are directly opposite each other in the second direction Y. If the noise reduction device is projected orthographically along the third direction Z, the orthographic projection of the groove 12 can be an axisymmetric figure, symmetrically arranged about the first axis of symmetry. Simultaneously, the orthographic projection of the sawtooth unit 20 away from the tip region of the connecting body 10 can overlap with the first axis of symmetry. Taking the sawtooth unit 20 as a triangle as an example, one vertex of the triangle formed by its orthographic projection can be located on the first axis of symmetry.

[0064] Furthermore, the orthographic projection of the sawtooth unit 20 along the third direction Z can be configured to be axially symmetrical about the first axis of symmetry, so that the sawtooth unit 20 is directly opposite the groove 12.

[0065] The groove 12 can be recessed relative to the protrusion 11 and the sawtooth unit 20. The position of the maximum recess depth can be adjusted by adjusting the shape and angle of the groove wall. The position of the maximum recess depth of the groove 12 is recorded as the lowest point of the groove 12. Then, along the third direction Z, the orthographic projection of the lowest point of the groove 12 can be located on the first axis of symmetry.

[0066] Furthermore, in embodiments where the lowest point of the groove 12 is a region with a certain area or a line with a certain extension dimension, the geometric center of the orthographic projection of this region can be located on the first axis of symmetry, or the lowest line can be extended along a straight line and coincide with the first axis of symmetry. Further options include making the inclination angles of each groove wall adjacent to the lowest point / lowest line / lowest region the same and the inclination directions symmetrical, to further improve the uniformity of the airflow distribution after guidance.

[0067] By setting the groove 12 and the sawtooth unit 20 to be axially symmetrical about the first axis of symmetry, the groove 12 and the sawtooth unit 20 can be positioned directly opposite each other, and the groove 12 can guide the airflow to the tip of the sawtooth unit 20, thereby improving the noise reduction effect.

[0068] In some alternative embodiments, along the second direction Y and pointing from the connecting body 10 to the side of the sawtooth unit 20, the groove width of the groove 12 in the first direction X first increases and then decreases.

[0069] Optionally, in the direction from the connecting body 10 to the sawtooth unit 20, the width of the groove 12 can first increase and then decrease, that is, the widest position of the groove 12 is located in the middle region in the second direction Y. For example, the orthographic projection of the groove 12 along the third direction Z can be rhomboid, circular, elliptical, or other polygonal shapes. Optionally, the trend of first increasing and then decreasing can be a uniform change or a stepped change, etc., and this application does not impose specific limitations on this as long as it can guide the airflow relatively smoothly.

[0070] The noise reduction effect can be further improved by adjusting the variation of the width of the groove 12.

[0071] In some alternative embodiments, along the first direction X, the maximum width of each groove 12 is equal to the width of the oppositely arranged sawtooth unit 20, and every two adjacent grooves 12 are connected at the maximum width position.

[0072] As previously described, in this embodiment, the groove 12 is positioned directly opposite the sawtooth unit 20 in the second direction Y, and is used to gather and guide the airflow to the position corresponding to the tip of the sawtooth unit 20. Furthermore, the overall width of the groove 12 can be the same as that of the sawtooth unit 20, and adjacent grooves 12 can be connected together.

[0073] Specifically, each groove 12 can have the same shape and size, and are arranged sequentially in the first direction X. Each groove 12 is connected to the adjacent groove 12 at the position where its width is the largest, that is, the area with the largest width of each groove 12 is flush with the position in the second direction Y, so that the grooves 12 form a structure that corresponds one-to-one with the sawtooth unit 20 and has the same width correspondence.

[0074] By setting the groove 12 to be directly opposite the sawtooth unit 20 and having the same width, the ability of the groove 12 to guide the airflow to flow near the central axis and tip area of ​​the sawtooth unit 20 can be further improved, thereby further improving the noise reduction effect.

[0075] In some optional embodiments, every two adjacent grooves 12 connect at the point of maximum width along the second direction Y. The vertical distance between the point of maximum width where they connect and the root of the tooth of the sawtooth unit 20 is S. The maximum length dimension of the sawtooth unit 20 is H, where S≤H.

[0076] In the embodiment where the grooves 12 are connected along the first direction X, the minimum vertical distance between the point where two adjacent grooves 12 connect and the root of the tooth of the sawtooth unit 20 along the second direction Y is denoted as S, and the size of the sawtooth unit 20 in the second direction Y is denoted as H. Then S should be less than or equal to H.

[0077] It is understandable that, in the second direction Y, the contact point between the grooves 12 can be located in the connecting body 10 and spaced apart from the sawtooth unit 20, or the grooves 12 can extend partially to the sawtooth unit 20, in which case the contact point can be located at the boundary line between the connecting body 10 and the sawtooth unit 20, that is, S can be selected as a value greater than 0 or equal to 0.

[0078] By limiting the distance between the contact point of the groove 12 and the root of the tooth of the sawtooth unit 20, the distance between the groove 12 and the sawtooth unit 20 can be shortened accordingly, thereby shortening the path of the airflow after the direction is adjusted by the groove 12 to the sawtooth unit 20, reducing the possibility of the airflow spreading to the gaps on both sides of the sawtooth unit 20 again, thus maintaining the good noise reduction effect.

[0079] In some optional embodiments, along the second direction Y and from the connecting body 10 to the sawtooth unit 20, the width of the protrusion 11 gradually decreases in the first direction X and the height gradually decreases in the third direction Z, and the first direction X, the second direction Y and the third direction Z are arranged to intersect each other.

[0080] The connecting body 10 is provided with a protrusion 11, which can protrude from the surface of the groove 12 and the sawtooth unit 20. At the same time, the orthographic projection shape of the protrusion 11 in the third direction Z can be set according to the setting position and arrangement of the groove 12.

[0081] For example, along the direction from the connecting body 10 to the sawtooth unit 20, the width of the protrusion 11 can gradually decrease and can be set to correspond to the area in the groove 12 whose width gradually increases in this direction, so that the arrangement areas of the groove 12 and the protrusion 11 in the second direction Y are partially offset from each other, so as to flexibly adjust the shape and size of both.

[0082] Similar to the width dimension, the protrusion height of the protrusion 11 can also decrease in the direction from the connecting body 10 to the sawtooth unit 20, thereby diverting the wind to both sides at the front end, causing the airflow to flow to the groove 12 and then through the sawtooth unit 20, thus making the gas mixing more uniform and the noise reduction effect more obvious.

[0083] In some alternative embodiments, the orthogonal projection of the protrusion 11 onto the third direction Z has an axisymmetric structure with a second axis of symmetry, two adjacent grooves 12 are symmetrically distributed with respect to the second axis of symmetry, and two adjacent sawtooth units 20 are symmetrically distributed with respect to the second axis of symmetry.

[0084] Similar to the groove 12, the protrusion 11 can also be an axisymmetric structure. Specifically, when the protrusion 11 is orthographically projected along the third direction Z, the resulting orthographic projection can be symmetrical about a second axis of symmetry, which can extend along the second direction Y. The orthographic projection formed by the protrusion 11 can be an isosceles triangle, a semicircle, a trapezoid, or other polygons.

[0085] Based on this, the two sawtooth units 20 adjacent to the second axis of symmetry are projected orthogonally along the third direction Z. The orthogonal projections of the two sawtooth units 20 can also be symmetrically arranged about the second axis of symmetry. That is, each protrusion 11 can be positioned directly opposite the gap between the two sawtooth units 20 and the same distance between it and the adjacent sawtooth units 20, so that the protrusion 11 can distribute the airflow more evenly and low to both sides, thereby further improving the noise reduction effect.

[0086] In some optional embodiments, each protrusion 11 includes a first surface 111 and a second surface 112 that are connected together, and the groove wall of each groove 12 includes a third surface 121 and a fourth surface 122 that are connected together; wherein, the side of the third surface 121 facing away from the fourth surface 122 is connected to the adjacent second surface 112 to form a first boundary line, and the side of the fourth surface 122 facing away from the third surface 121 is connected to the adjacent first surface 111 to form a second boundary line, and the first boundary line and the second boundary line are symmetrically arranged in the second direction Y.

[0087] In the connecting body 10, the protrusion 11 may include a first surface 111 and a second surface 112 that are connected to each other. The intersection line formed by the intersection of the two surfaces may be a protruding ridge in the protrusion 11, and the protruding vertex of the intersection line is recorded as the position where the protrusion size of the protrusion 11 is the largest. The intersection line may extend along a straight line.

[0088] Similarly, the groove wall of the groove 12 may include a third surface 121 and a fourth surface 122, which intersect to form an intersection line. This intersection line may be selected as the bottom of the groove 12 and pass through the position where the groove 12 has the greatest recess depth.

[0089] Based on this, the two surfaces of the groove wall of the groove 12 are respectively connected to the two surfaces of the protrusions 11 on both sides. Taking a groove 12 with a first protrusion 11 and a second protrusion 11 on both sides as an example, the third surface 121 of the groove 12 is connected to the second surface 112 of the first protrusion 11 and intersects to form a first boundary line. The third surface 121 is connected to the first surface 111 of the second protrusion 11 and intersects to form a second boundary line. The two boundary lines are symmetrically arranged in the second direction Y.

[0090] By making the top surface of the protrusion 11 and the groove wall of the groove 12 both include two intersecting surfaces, the structure of the connecting body 10 can be simplified and made easier to process. At the same time, the protrusion 11 and the groove 12 can be tightly connected, reducing the required installation space and improving space utilization. Meanwhile, by making the intersection lines symmetrically arranged, the protrusion 11 and the groove 12 can be made to have regular shapes and uniform distribution, thereby further improving the effect of the noise reduction device in reducing aerodynamic noise.

[0091] In some optional embodiments, two adjacent protrusions 11 are connected in the first direction X, and the orthographic projection line of the plurality of protrusions 11 extends in a broken line or a curved line along the second direction Y.

[0092] Similar to the arrangement of the grooves 12, adjacent protrusions 11 can also be connected in the first direction X, and can be further selected to be connected at the position where the protrusion size and width size are the largest. This connection point can be close to the edge of the connecting body 10 away from the sawtooth unit 20.

[0093] For example, in the embodiment where the protrusion 11 has a first surface 111 and a second surface 112, each protrusion 11 may further include an end face located at the end of the connecting body 10 away from the sawtooth unit 20 and optionally perpendicular to the second direction Y. The protrusion 11 formed in this case is part of a square pyramid, the base of which may be rhomboid, and is divided into two parts along the cross-section containing the minor or major axis of the rhomboid base. The protrusion 11 may have the same shape as one of the parts, and the side of the cross-section cut off serves as the aforementioned end face.

[0094] Based on this, if multiple protrusions 11 are projected together along the second direction Y, the edge lines formed by them protruding from one side surface of the sawtooth unit 20 can be selected as interconnected broken lines or curves to provide a good diversion effect for the airflow.

[0095] The noise reduction device in this application embodiment was applied to a wind turbine generator set 300 with a rotor diameter of about 150m and tested. The test results are shown in the table below at the rated wind speed (10m / s).

[0096] Table 1

[0097] According to the test results in Table 1, the noise reduction device provided in this application embodiment can effectively reduce the noise of the wind turbine generator set 300.

[0098] Please refer to Figure 5, which is a structural schematic diagram of a blade 200 provided in one embodiment of this application. In a second aspect, this application provides a blade 200, comprising: a blade 200 body having a leading edge 30 and a trailing edge 40 disposed opposite to each other in a second direction Y; the blade 200 body having a windward surface and a leeward surface disposed opposite to each other in a third direction Z; the second direction Y and the third direction Z intersecting each other; and a blade noise reduction device 100 as described in any embodiment of the first aspect, disposed at the trailing edge 40, with at least one of the windward surface and the leeward surface connected to the blade noise reduction device 100.

[0099] This application also provides a blade 200 that includes the blade noise reduction device 100 in any embodiment of the first aspect, which can be applied to a wind turbine generator set 300.

[0100] Specifically, the blade 200 includes a blade 200 body and a noise reduction device connected to the blade 200 body. The blade 200 body and the noise reduction device can be connected by methods such as bonding, snap-fitting, pressing, riveting, fastener connection, or integral molding. This application does not impose specific limitations on this, as long as the aerodynamic shape of the blade 200 body and the noise reduction device is not damaged. When connecting the noise reduction device to the blade 200 body, the side surface with the protrusion 11 and the groove 12 can be positioned away from the blade 200 body, while the opposite side surface can conform to the shape of the blade 200 body to make the connection between the two more stable and reliable.

[0101] In the blade 200, the axial direction of the blade 200 body can be parallel or nearly parallel to the first direction X of the noise reduction device, and the chord direction of the blade 200 body can be parallel or nearly parallel to the second direction Y. Therefore, the blade 200 body has opposing leading edges 30 and trailing edges 40 in the second direction Y, and the noise reduction device is connected and disposed at the trailing edge 40. Simultaneously, the blade 200 body has opposing windward and leeward surfaces in the third direction Z, and at least one of the windward and leeward surfaces is provided with a noise reduction device.

[0102] Optionally, the blade 200 may be equipped with noise reduction devices on both the windward and leeward sides to further improve the noise reduction effect. In embodiments where noise reduction devices are provided on both opposite sides, the noise reduction devices connected to the two sides may be staggered or overlapped in the first direction X. When overlapped, the noise reduction devices on both sides may be arranged in a "back-to-back" manner, so that the protrusion 11 and the groove 12 are located on the side away from each other.

[0103] Taking a noise reduction device on the windward side as an example, the blade 200 may include one or more noise reduction devices. In embodiments with multiple noise reduction devices, the multiple noise reduction devices may be arranged at intervals or adjacent to each other along the extension direction of the trailing edge.

[0104] Optionally, while meeting the size limitations of the protrusion 11 and groove 12 in the noise reduction device in the aforementioned embodiments, the specific size parameters of the noise reduction device can be designed according to parameters such as the chord length, twist angle and relative thickness of the local area connected to the blade 200 body, so as to further improve the overall flow control effect of the blade 200.

[0105] Please refer to Figure 6, which is a structural schematic diagram of a wind turbine generator set 300 provided in one embodiment of this application. In a third aspect, embodiments of this application provide a wind turbine generator set 300, including the blades 200 in any embodiment of the second aspect.

[0106] The blade 200 and wind turbine generator 300 in this embodiment have all the beneficial effects of the blade noise reduction device 100 in the first aspect. For details, please refer to the specific description of the blade noise reduction device 100 in the above embodiments. This embodiment will not repeat the description here.

[0107] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A blade noise reduction device, comprising: The connecting body is provided with multiple protrusions and grooves that are alternately distributed along the first direction; A sawtooth unit, wherein a plurality of the sawtooth units are connected to one end of the connecting body in a second direction, and each of the sawtooth units is arranged along the first direction; In this configuration, along the second direction, each of the sawtooth units is respectively arranged in a one-to-one correspondence with each of the grooves, and the orthographic projection of the protrusion is at least partially located between two adjacent sawtooth units and protrudes beyond the orthographic projection of the sawtooth unit. The second direction intersects with the first direction.

2. The blade noise reduction device according to claim 1, wherein, Along a third direction, the groove is recessed relative to the surface of the sawtooth unit, and the first direction, the second direction, and the third direction intersect each other.

3. The blade noise reduction device according to claim 1, wherein, Along the first direction, the protrusions and the grooves are arranged alternately, and the maximum extension dimension of each sawtooth unit and the maximum extension dimension of each groove are the same.

4. The blade noise reduction device according to claim 1, wherein, The axis of symmetry of the sawtooth unit passes through the center of the groove where the depth of the recess is the greatest.

5. The blade noise reduction device according to claim 1, wherein, The groove wall that encloses and forms the groove has a polygonal orthographic projection along a third direction, and the first direction, the second direction and the third direction are arranged to intersect each other; The groove wall that encloses the groove has an axisymmetric shape with a first axis of symmetry when projected along the third direction. The orthographic projection of the tooth tip of the sawtooth unit is placed on the first axis of symmetry along the third direction, and the lowest point of the groove in the third direction is located on the first axis of symmetry.

6. The blade noise reduction device according to claim 1, wherein, Along the second direction and from the connecting body to one side of the sawtooth unit, the groove width in the first direction first increases and then decreases; Along the first direction, the maximum width of each groove is equal to the width of the oppositely arranged sawtooth unit, and each pair of adjacent grooves are connected at the maximum width position.

7. The blade noise reduction device according to claim 6, wherein, Every two adjacent grooves connect at the point of maximum width. Along the second direction, the perpendicular distance between the point of maximum width where they connect and the root of the tooth of the sawtooth unit is S. The maximum length dimension of the sawtooth unit is H, where S≤H.

8. The blade noise reduction device according to any one of claims 1 to 7, wherein, Along the second direction and from the connecting body to the sawtooth unit, the width of the protrusion gradually decreases in the first direction and the height gradually decreases in the third direction. The first direction, the second direction, and the third direction intersect each other. The protrusion, when projected onto the third direction, has an axisymmetric structure with a second axis of symmetry. Two adjacent grooves are symmetrically distributed with respect to the second axis of symmetry, and two adjacent sawtooth units are symmetrically distributed with respect to the second axis of symmetry.

9. The blade noise reduction device according to claim 8, wherein, Each of the protrusions includes a first surface and a second surface that are connected to each other, and the groove wall of each of the grooves includes a third surface and a fourth surface that are connected to each other; The third surface, on the side away from the fourth surface, is connected to the adjacent second surface to form a first boundary line, and the fourth surface, on the side away from the third surface, is connected to the adjacent first surface to form a second boundary line. The first boundary line and the second boundary line are symmetrically arranged in the second direction.

10. A leaf, comprising: The blade noise reduction device as described in any one of claims 1 to 9; The blade body has a leading edge and a trailing edge that are arranged opposite to each other in a second direction. The blade body has a windward side and a leeward side that are arranged opposite to each other in a third direction. The first direction, the second direction and the third direction are arranged to intersect each other. The blade noise reduction device is disposed on the trailing edge. At least one of the windward side and the leeward side is connected to the blade noise reduction device.

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