Blade noise reduction device, blade and wind generating set

Abstract

The invention discloses a blade noise reduction device, a blade and a wind generating set. The blade noise reduction device comprises a connecting body and a sawtooth unit. The connecting body is provided with a plurality of protrusions and grooves which are alternately distributed in the first direction. The plurality of sawtooth units are connected to one end of the connecting body in the second direction, and the sawtooth units are arranged in the first direction. Wherein in the second direction, each sawtooth unit is correspondingly provided with a groove, at least part of the orthographic projection of each protrusion is located between every two adjacent sawtooth units and protrudes out of the orthographic projection of the corresponding sawtooth unit, and the second direction intersects with the first direction. The blade noise reduction device can obviously reduce aerodynamic noise generated by the blade.

Description

Technical Field

[0001] The present application belongs to the technical field of wind power generation, and in particular relates to a blade noise reduction device, a blade and a wind power generator set. Background Art

[0002] As the capacity of wind turbines increases, the blades are required to be longer and longer. This leads to the increasing radiation noise of the blades. For large megawatt wind turbines, the noise mainly comes from the aerodynamic noise of the blades, especially the trailing edge noise of the turbulent boundary layer. Therefore, the development of noise reduction accessories with significant noise reduction effect is particularly important. The serrated trailing edge is currently the most widely used noise reduction accessory for blades. However, the research results show that the existing serrated trailing edge has an unsatisfactory noise reduction effect, the reduction is very limited, and rebound occurs at high wind speeds. The noise is even higher than when the serrated trailing edge is not installed.

[0003] Therefore, there is an urgent need for a blade noise reduction device capable of reducing aerodynamic noise, as well as corresponding blades and wind turbine generator sets. Summary of the invention

[0004] The present application provides a blade noise reduction device, a blade and a wind turbine generator set, wherein the blade noise reduction device can significantly reduce noise.

[0005] In a first aspect, an embodiment of the present application provides a blade noise reduction device, comprising: a connecting body, provided with a plurality of protrusions and grooves alternately distributed along a first direction; a sawtooth unit, wherein a plurality of sawtooth units are connected to one end of the connecting body in a second direction, and each sawtooth unit is arranged along the first direction; wherein, along the second direction, each sawtooth unit is respectively provided with a groove, an orthographic projection of the protrusion is at least partially located between two adjacent sawtooth units and protrudes from the orthographic projection of the sawtooth unit, and the second direction intersects with the first direction.

[0006] According to one aspect of the embodiment of the present 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.

[0007] According to one aspect of an embodiment of the present application, along the second direction, the maximum length dimension of the sawtooth unit is H, and along the third direction, the distance between the highest point and the lowest point of the protrusion is A, wherein H / 100≤A≤H / 5, and the first direction, the second direction and the third direction intersect with each other.

[0008] According to one aspect of the embodiment of the present application, the orthographic projection of the groove wall enclosing the groove along the third direction is polygonal, and the first direction, the second direction and the third direction are intersected in pairs.

[0009] According to one aspect of an embodiment of the present application, the orthographic projection of the groove wall that encloses the groove along the third direction presents an axially symmetrical 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.

[0010] According to one aspect of the embodiment of the present application, along the second direction and from the connecting body to one side of the sawtooth unit, the width of the groove in the first direction tends to increase first and then decrease.

[0011] According to one aspect of the embodiment of the present application, along the first direction, the maximum width of each groove is equal to the width of the oppositely arranged sawtooth units, and every two adjacent grooves are connected at the maximum width position.

[0012] According to one aspect of an embodiment of the present application, every two adjacent grooves are connected at the maximum width position point, and along the second direction, the vertical distance between the connected maximum width position point and the tooth root of the sawtooth unit is S, and the maximum length dimension of the sawtooth unit is H, where S≤H.

[0013] According to one aspect of an embodiment of the present application, along the second direction and in the direction from the connecting body to the sawtooth unit, the width of the protrusion in the first direction tends to gradually decrease, and the height in the third direction tends to gradually decrease, and the first direction, the second direction and the third direction are arranged to intersect each other.

[0014] According to one aspect of an embodiment of the present application, the orthographic projection of the protrusion in the third direction is an axially symmetrical structure having a second axis of symmetry, two adjacent grooves are symmetrically distributed relative to the second axis of symmetry, and two adjacent sawtooth units are symmetrically distributed relative to the second axis of symmetry.

[0015] According to one aspect of an embodiment of the present application, each protrusion includes a first surface and a second surface that are connected to each other, and the groove wall of each groove includes a third surface and a fourth surface that are connected to each other; wherein, the side of the third surface facing away from the fourth surface is connected to the adjacent second surface and forms a first boundary line, and the side of the fourth surface facing away from the third surface is connected to the adjacent first surface and forms a second boundary line, and the first boundary line and the second boundary line are symmetrically arranged in the second direction.

[0016] According to one aspect of the embodiments of the present application, two adjacent protrusions are arranged to be connected in the first direction, and along the second direction, the connecting line of the orthographic projections of the plurality of protrusions extends in a broken line trajectory or a curved trajectory.

[0017] In the second aspect, an embodiment of the present application provides a blade, comprising: a blade body, having a leading edge and a trailing edge relatively arranged in a second direction, the blade body having a windward surface and a leeward surface relatively arranged in a third direction, the second direction and the third direction being arranged to intersect each other; the blade noise reduction device in any embodiment of the first aspect is arranged at the trailing edge, and at least one of the windward surface and the leeward surface is connected to the blade noise reduction device.

[0018] In a third aspect, an embodiment of the present application provides a wind turbine generator set, comprising the blade in any embodiment of the second aspect.

[0019] The blade noise reduction device provided by the present application includes a connecting body and a plurality of sawtooth units connected to the connecting body. The connecting body is provided with a plurality of grooves and a plurality of protrusions, the sawtooth units and the connecting body are arranged along the second direction, and in the second direction, each sawtooth unit is respectively provided with a groove, and the orthographic projection of the protrusion is at least partially located between two adjacent sawtooth units and protrudes from the orthographic projection of the sawtooth unit, thereby enabling the airflow flowing through the connecting body to have a flow trajectory closer to the central axis of each sawtooth unit, thereby facilitating the combing of vortices in the air and achieving a better noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] Figure 1 is a schematic structural diagram of a blade noise reduction device provided by an embodiment of the present application;

[0022] Figure 2 is a structural schematic diagram of a blade noise reduction device provided by another embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of a blade noise reduction device provided by another embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of a blade noise reduction device provided in another embodiment of the present application;

[0025] Figure 5 is a schematic diagram of the structure of a blade provided by an embodiment of the present application;

[0026] Figure 6 It is a schematic diagram of the structure of a wind turbine generator set provided in one embodiment of the present application.

[0027] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0028] in:

[0029] 100-blade noise reduction device; 200-blade; 300-wind turbine generator set;

[0030] 10-connecting body; 20-sawtooth unit; 30-front edge; 40-rear edge;

[0031] 11- protrusion; 12- groove;

[0032] 111 - first surface; 112 - second surface; 121 - third surface; 122 - fourth surface;

[0033] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0034] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0035] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structures in the molding mold and molding method of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the meaning of "multiple" is more than two, and the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] With the development of wind power generation technology, the number of existing wind turbines has gradually increased. With the promotion and application of distributed units, the minimum distance between the installation location of wind turbines and residential areas has gradually shortened. At the same time, with the development of single-unit large-scale technology, the single-unit capacity of wind turbines has continued to increase, and the length and speed of their blades have also continued to increase, resulting in a gradual increase in noise during the operation of wind turbines.

[0038] On this basis, the applicant found that the noise reduction method used by existing wind turbine blades usually includes means such as setting a serrated structure on the trailing edge of the blade, but the existing serrated structure has poor control over the flow form of gas at the trailing edge of the blade and has low control stability.

[0039] In order to solve the above problems, an embodiment of the present application provides a blade noise reduction device, a blade and a wind turbine generator set, which further guides the vortex at the edge of the blade by adjusting the flow trajectory of the airflow flowing through the blade noise reduction device, thereby improving the noise reduction effect.

[0040] It can be understood that the following embodiments of the present application only illustrate the application of the blade noise reduction device to wind turbine blades as an example, but the application of the blade noise reduction device provided in the embodiments of the present application is not limited to the following embodiments, and can also be used in other occasions where aerodynamic noise needs to be reduced and protected.

[0041] In order to better understand this application, Figures 1 to 6 Describe in detail.

[0042] Please also read Figures 1 to 4 , Figure 1 is a schematic diagram of the structure of a blade noise reduction device provided by an embodiment of the present application. Figure 2 is a schematic diagram of the structure of a blade noise reduction device provided by another embodiment of the present application. Figure 3 is a structural schematic diagram of a blade noise reduction device provided by another embodiment of the present application, Figure 4 It is a structural schematic diagram of a blade noise reduction device provided in another embodiment of the present application.

[0043] In a first aspect, an embodiment of the present application provides a blade noise reduction device 100, comprising: a connecting body 10, provided with a plurality of protrusions 11 and grooves 12 alternately distributed along a first direction X; a sawtooth unit 20, wherein a plurality of sawtooth units 20 are connected to one end of the connecting body 10 in a second direction Y, and each sawtooth unit 20 is arranged along the first direction X; wherein along the second direction Y, each sawtooth unit 20 is respectively provided with a groove 12, an orthographic projection of the protrusion 11 is at least partially located between two adjacent sawtooth units 20 and protrudes from the orthographic projection of the sawtooth unit 20, and the second direction Y is arranged to intersect with the first direction X.

[0044] The embodiment of the present application first provides a blade noise reduction device 100 (hereinafter referred to as the noise reduction device), including a connecting body 10 and a sawtooth unit 20, which are connected to each other and can be integrally formed to have a higher structural strength as a whole. The connecting body 10 at least partially extends 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 can be of the same shape and size and connected in the first direction X to facilitate processing and have a good noise reduction effect. The first direction X and the second direction Y can be arranged perpendicular to each other.

[0045] The connecting body 10 is provided with a plurality of protrusions 11 and grooves 12 arranged alternately in the first direction X in which it extends. These protrusions 11 and grooves 12 can be arranged alternately one by one. Each protrusion 11 can have the same or similar shape, size and setting position. Specifically, when each protrusion 11 is orthographically projected along the first direction X, the orthographic projection figures formed can overlap each other. The setting of the grooves 12 is similar to that of the protrusions 11, and will not be repeated here.

[0046] Optionally, the shape of the groove 12 may be circular, elliptical, polygonal, etc., and the shape of the protrusion 11 may be pyramidal, hemispherical, semi-ellipsoidal, etc.

[0047] It can be understood that the protrusions 11 and the grooves 12 are alternately arranged along the first direction X here, which means that the grooves 12 and the protrusions 11 are orthographically projected along the second direction Y, and then, except for the protrusions 11 / grooves 12 located at the edge, the orthographic projection of each of the other protrusions 11 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 the two are orthographically projected along the first direction X, the orthographic projection of the protrusion 11 and the orthographic projection of the groove 12 can overlap, partially overlap, or completely stagger.

[0048] Further, on the side surface of the noise reduction device provided with the protrusion 11 and the groove 12, the protrusion 11 is provided protrudingly relative to the surface of the sawtooth unit 20, and the groove 12 can be provided concavely relative to the protrusion 11. Optionally, the groove 12 can be provided concavely 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 flowing through the connection body 10. The other side surface opposite to the protrusion 11 and the groove 12 can be selected as a plane, arranged in accordance with the shape of the blade 200 to be connected, or having a concave-convex structure corresponding to the protrusion 11 and the groove 12, and the present application does not make any specific limitation.

[0049] When the noise reduction device is orthographically projected along the second direction Y, the orthographic projection of the protrusion 11 is located between the orthographic projections of two adjacent sawtooth units 20, and the orthographic projection of the groove 12 is at least partially overlapped with the orthographic 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 isosceles triangle structure of the sawtooth unit 20 as an example, the symmetry axis of the sawtooth unit 20 can pass through the center position of the groove 12 with the maximum depression depth. Correspondingly, the protrusions 11 alternately arranged with the grooves 12 are arranged corresponding to the spacing area between the sawtooth units 20.

[0050] By providing the protrusion 11 and the groove 12 on the connection body 10 and arranging the groove 12 and the sawtooth unit 20 at a position facing each other, the flow direction of the airflow passing through the noise reduction device can be further adjusted. When the airflow passes through the noise reduction device in the direction from the connection body 10 to the sawtooth unit 20, the protrusion 11 can split the airflow so that the airflow flows more from both sides of the protrusion 11, and the groove 12 can concentrate the airflow so that the airflow flows more along the path close to the center area of ​​the groove 12, thereby adjusting the flow direction of the airflow so that it flows more toward the tip of the sawtooth unit 20. Please refer to Figure 4 ,Depend on Figure 4 The flow direction A is the flow direction of the airflow when the protrusion 11 and the groove 12 are not provided, and the flow direction B is the flow direction of the airflow at the noise reduction device in the embodiment of the present application. Therefore, by providing the noise reduction device, the distance between the airflow path and the spacing area between the sawtooth unit 20 can be increased, so that the gas mixing is more uniform, and the noise reduction effect is effectively improved.

[0051] In some optional 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.

[0052] Along the second direction Y in which the connecting body 10 and the sawtooth unit 20 are arranged, the maximum length dimension of the sawtooth unit 20 is recorded as Hmm, and the extension dimension of the groove 12 is recorded as Lmm. It can be understood that the second direction Y is regarded as perpendicular to the first direction X, and the maximum length dimension here refers to the length dimension of the orthographic projection figure formed by orthographically projecting the groove 12 and the sawtooth unit 20 along the first direction X in the second direction Y.

[0053] Further, the maximum length dimension L of the groove 12 may be less than or equal to 3 times the maximum length dimension H of the sawtooth unit 20, that is, L≤3H. In the embodiment where the connecting body 10 has a larger extension dimension along the second direction Y, the extension dimension of the groove 12 may be increased accordingly, and its dimension in the first direction X may be designed according to the width of the sawtooth unit 20 and the setting position of the protrusion 11.

[0054] By limiting the size of the groove 12 within the aforementioned range, the possibility of the groove 12 being too long, resulting in the noise reduction device requiring too much installation space, can be reduced, while the possibility of the airflow gathering effect being reduced due to the excessive size can be reduced.

[0055] In some optional embodiments, along the second direction Y, the maximum length dimension of the sawtooth unit 20 is H, and along the third direction Z, the distance between the highest point and the lowest point of the protrusion 11 is A, wherein H / 100≤A≤H / 5, and the first direction X, the second direction Y and the third direction Z intersect with each other.

[0056] Similar to the aforementioned definition of the length dimension, the maximum length dimension of the sawtooth unit 20 in the second direction Y is recorded as H, and at the same time, in the third direction Z, i.e., the thickness direction of the noise reduction device, the extension dimension of the protrusion 11 is recorded 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, and can be selected as the dimension of the top of the protrusion 11 protruding from 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.

[0057] On this basis, the size A of the protrusion 11 is set to be between H / 100 and H / 5. By limiting the protruding size of the protrusion 11, the possibility that the protrusion 11 is too low, resulting in an insignificant airflow diversion effect, can be reduced. At the same time, the possibility that the protrusion 11 is too high, resulting in increased costs, excessive airflow obstruction, and impact can be reduced.

[0058] In some optional embodiments, the orthographic projection of the groove wall enclosing the groove 12 along the third direction Z is polygonal, and the first direction X, the second direction Y and the third direction Z are intersected in pairs.

[0059] Optionally, when the groove 12 is provided, the groove wall enclosing the groove 12 can be set to a polygon, so that it is easy to process and easy to connect with the protrusion 11. Exemplarily, the groove 12 can include multiple polygonal wall portions, which are assembled and enclosed to form the groove 12. Along the third direction Z, the orthographic projection of the entire groove wall can be polygonal, and by adjusting the angle between each wall portion, the area with the largest concave depth of the groove 12 is formed at the junction between adjacent wall portions.

[0060] By setting the groove 12 to a polygon, it is convenient to set the groove wall to a plurality of wall portions that are assembled with each other. At the same time, setting the groove wall to a polygon facilitates controlling the flow direction of the airflow passing therethrough. While making the flow direction approach the concave part of the groove 12, the flow direction can be further regulated by the extended square of the boundary line between adjacent wall portions, thereby further improving the noise reduction effect.

[0061] In some optional embodiments, the orthographic projection of the groove wall that encloses the groove 12 along the third direction Z presents an axially symmetrical figure having a first axis of symmetry, and along the third direction Z, the orthographic projection of the tooth tip of the sawtooth unit 20 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.

[0062] As mentioned above, the groove 12 in the noise reduction device is arranged opposite to the sawtooth unit 20 in the second direction Y. When the noise reduction device is orthographically projected along the third direction Z, the orthographic projection of the groove 12 can be an axisymmetric figure and be symmetrically arranged about the first symmetry axis. At the same time, the orthographic projection of the tip area of ​​the sawtooth unit 20 away from the connecting body 10 can overlap with the first symmetry axis. For example, if the sawtooth unit 20 is a triangle, one of the vertices of the triangle formed by its orthographic projection can be located on the first symmetry axis.

[0063] Furthermore, the orthographic projection of the sawtooth unit 20 along the third direction Z may be optionally arranged to be axially symmetrical about the first symmetry axis, so as to further enable the sawtooth unit 20 to be arranged opposite to the groove 12 .

[0064] The groove 12 may be recessed relative to the protrusion 11 and the sawtooth unit 20, and the position where the recess depth is the largest may be adjusted accordingly by adjusting the groove wall shape and angle, etc. The position where the recess depth of the groove 12 is the largest is recorded as the lowest point of the groove 12, and then along the third direction Z, the orthographic projection of the lowest point of the groove 12 may be located on the first symmetry axis.

[0065] In addition, in the embodiments where the lowest point of the groove 12 is a region with a certain area or a line with a certain extension size, the geometric center of the positive projection of the region can be located on the first symmetry axis, or the lowest line can be extended along a straight line and coincide with the first symmetry axis. It can be further selected that the inclination angles of the groove walls adjacent to the lowest point / lowest line / lowest region are the same and the inclination directions are symmetrical, so as to further improve the uniformity of the airflow distribution after guidance.

[0066] By arranging the groove 12 and the sawtooth unit 20 to have an axially symmetrical structure with respect to the first symmetry axis, the groove 12 can be further arranged opposite to the sawtooth unit 20, and the groove 12 can guide the airflow to flow toward the tip of the sawtooth unit 20, thereby improving the noise reduction effect.

[0067] In some optional embodiments, along the second direction Y and from the connecting body 10 to one side of the sawtooth unit 20 , the width of the groove 12 in the first direction X tends to increase first and then decrease.

[0068] Optionally, in the direction from the connecting body 10 to the sawtooth unit 20, the width of the groove 12 may be increased first and then decreased, that is, the widest position of the groove 12 is located in the middle area in the second direction Y. For example, the positive projection of the groove 12 along the third direction Z may be a rhombus, a circle, an ellipse or other polygons. Optionally, the change trend of increasing first and then decreasing here may be a uniform change or a step-by-step change, etc., and the present application does not make any specific limitation on this on the basis of being able to guide the airflow more smoothly.

[0069] The noise reduction effect can be further improved by adjusting the width variation of the groove 12 .

[0070] In some optional 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 arranged adjacent to each other at the maximum width position.

[0071] As mentioned above, the groove 12 in the embodiment of the present application is arranged opposite to 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. On this basis, the overall width of the groove 12 can be the same as that of the sawtooth unit 20, and adjacent grooves 12 can be arranged in contact.

[0072] Specifically, each groove 12 may have the same shape and size, and may be arranged in sequence in the first direction X. Each groove 12 is arranged in contact with an adjacent groove 12 at a position where its width dimension is the largest, that is, the area where the width dimension of each groove 12 is the largest is flush with the position in the second direction Y, so that the groove 12 forms a structural form in which the grooves 12 correspond one-to-one with the sawtooth units 20 and have the same width correspondence.

[0073] By arranging the groove 12 to be opposite to 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.

[0074] In some optional embodiments, every two adjacent grooves 12 are connected at the maximum width position point, and along the second direction Y, the vertical distance between the connected maximum width position point and the tooth root of the sawtooth unit 20 is S, and the maximum length dimension of the sawtooth unit 20 is H, where S≤H.

[0075] In the embodiment where the grooves 12 are connected along the first direction X, the minimum vertical spacing between the connecting point between two adjacent grooves 12 and the root of the sawtooth unit 20 along the second direction Y is recorded as S, and the size of the sawtooth unit 20 in the second direction Y is recorded as H, then S should be less than or equal to H.

[0076] It can be understood that, in the second direction Y, the connection point between the grooves 12 can be located in the connecting body 10 and spaced apart from the sawtooth unit 20, or the groove 12 can partially extend to the sawtooth unit 20, in which case the connection 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 or equal to 0.

[0077] By limiting the distance between the junction point of the groove 12 and the tooth root 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 flow to the sawtooth unit 20, and reducing the possibility of the airflow dispersing again to the gaps on both sides of the sawtooth unit 20, thereby maintaining a good noise reduction effect.

[0078] In some optional embodiments, along the second direction Y and in the direction from the connecting body 10 to the sawtooth unit 20, the width of the protrusion 11 in the first direction X tends to gradually decrease, and the height in the third direction Z tends to gradually decrease, and the first direction X, the second direction Y and the third direction Z are arranged to intersect each other.

[0079] The connecting body 10 is provided with a protrusion 11, which can protrude from the groove 12 and the surface of the sawtooth unit 20. At the same time, the orthographic projection shape of the protrusion 11 in the third direction Z can be set accordingly according to the setting position and arrangement of the groove 12.

[0080] Exemplarily, along the direction from the connecting body 10 to the sawtooth unit 20, the width dimension of the protrusion 11 may tend to gradually decrease, and may be arranged corresponding to the area in the groove 12 where the 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 staggered with each other, so as to flexibly adjust the shapes and sizes of the two.

[0081] Similar to the width dimension, the protruding height of the protrusion 11 can also tend to decrease in the direction from the connecting body 10 to the sawtooth unit 20, thereby diverting the wind to both sides in the front section facing the wind, allowing the airflow to flow to the groove 12 position and then flow through the sawtooth unit 20, thereby making the gas mixing more uniform and the noise reduction effect more obvious.

[0082] In some optional embodiments, the orthographic projection of the protrusion 11 in the third direction Z is an axisymmetric structure having a second axis of symmetry, two adjacent grooves 12 are symmetrically distributed relative to the second axis of symmetry, and two adjacent serration units 20 are symmetrically distributed relative to the second axis of symmetry.

[0083] Similar to the groove 12, the protrusion 11 may be selected to be an axisymmetric structure. Specifically, the protrusion 11 is orthographically projected along the third direction Z, and the orthographic projection figure formed can be symmetrically arranged about the second symmetry axis, and the second symmetry axis 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.

[0084] On this basis, the two sawtooth units 20 adjacent to the second symmetry axis are projected along the third direction Z, and the orthographic projections of the two sawtooth units 20 can also be symmetrically arranged about the second symmetry axis, that is, each protrusion 11 can be arranged opposite to the interval between the two sawtooth units 20, and have the same spacing as that between adjacent sawtooth units 20, so that the protrusion 11 can divert the airflow more evenly to both sides, thereby further improving the noise reduction effect.

[0085] In some optional embodiments, each protrusion 11 includes a first surface 111 and a second surface 112 that are connected to each other, and the groove wall of each groove 12 includes a third surface 121 and a fourth surface 122 that are connected to each other; wherein, the side of the third surface 121 facing away from the fourth surface 122 is connected to the adjacent second surface 112 and forms 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 and forms a second boundary line, and the first boundary line and the second boundary line are symmetrically arranged in the second direction Y.

[0086] In the connection body 10, the protrusion 11 may include a first surface 111 and a second surface 112 which are arranged in contact with 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.

[0087] 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, which may be selected as the bottom of the groove 12 and pass through the position where the groove 12 has the maximum depression depth.

[0088] On this basis, the two surfaces included in 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, and 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.

[0089] By making the top surface of the protrusion 11 and the groove wall of the groove 12 include two intersecting surfaces, the structure of the connecting body 10 can be simplified and made easier to process, and the protrusion 11 and the groove 12 can be tightly connected, reducing the required installation space and improving space utilization. At the same time, by making the intersection lines symmetrical, the protrusion 11 and the groove 12 can be regular in shape and evenly distributed, thereby further improving the effect of the noise reduction device in reducing aerodynamic noise.

[0090] In some optional embodiments, two adjacent protrusions 11 are arranged to be connected in the first direction X, and along the second direction Y, a connecting line of the orthographic projections of the plurality of protrusions 11 extends in a zigzag trajectory or a curved trajectory.

[0091] Similar to the arrangement of the grooves 12, adjacent protrusions 11 can also be arranged in connection in the first direction X, and can further be optionally connected at the position where the protrusion size and width size are the largest. The connection point can be close to the side edge of the connecting body 10 away from the sawtooth unit 20.

[0092] For example, in the embodiment where the protrusion 11 has the first surface 111 and the second surface 112, each protrusion 11 may further include an end surface, which is located at the end of the connecting body 10 away from the sawtooth unit 20 and may be arranged perpendicular to the second direction Y. The protrusion 11 formed at this time is a part of a quadrangular pyramid, the bottom surface of the quadrangular pyramid may be a rhombus, and the cross section along the short axis or long axis of the bottom surface of the rhombus is divided into two parts, and the protrusion 11 may have the same shape as one of the parts, and the side of the truncated cross section is used as the end surface.

[0093] On this basis, the plurality of protrusions 11 are projected orthographically along the second direction Y, and the edge line formed by the protrusion from the surface of one side of the sawtooth unit 20 can be selected to form interconnected broken lines or curves to provide a good diversion effect on the airflow.

[0094] The noise reduction device in the embodiment of the present application was applied to a wind turbine generator set 300 with a wind rotor diameter of about 150m and tested. At the rated wind speed (10m / s), the test results are shown in the following table.

[0095] Table 1

[0096]

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

[0098] See also Figure 5 , Figure 52 is a schematic diagram of the structure of a blade 200 provided by an embodiment of the present application. In the second aspect, the embodiment of the present application provides a blade 200, comprising: a blade 200 body, having a leading edge 30 and a trailing edge 40 arranged relatively in a second direction Y, the blade 200 body having a windward surface and a leeward surface arranged relatively in a third direction Z, the second direction Y and the third direction Z being arranged to intersect each other; the blade noise reduction device 100 in any embodiment of the first aspect, arranged at the trailing edge 40, at least one of the windward surface and the leeward surface being connected to the blade noise reduction device 100.

[0099] An embodiment of the present application further provides a blade 200 comprising the blade noise reduction device 100 in any embodiment of the first aspect, and the blade 200 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 bonding, clamping, crimping, riveting, fastener connection or integrated molding. This application does not make any specific restrictions 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 provided with the protrusion 11 and the groove 12 can be set away from the blade 200 body, and the other side surface opposite can be set in the same shape as the blade 200 body, so that the connection between the two is 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. Thus, the blade 200 body has a leading edge 30 and a trailing edge 40 relative to each other in the second direction Y, and the noise reduction device is connected and arranged at the trailing edge 40. At the same time, the blade 200 body has a windward surface and a leeward surface relative to each other in the third direction Z, and at least one of the windward surface and the leeward surface is provided with the noise reduction device.

[0102] Optionally, the blade 200 may be provided with noise reduction devices connected to both the windward surface and the leeward surface to further improve the noise reduction effect. In the embodiment where noise reduction devices are provided on both opposite surfaces, the noise reduction devices respectively connected to the two surfaces may be mutually staggered or overlapped in the first direction X. When overlapping, 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 the windward surface being provided with a noise reduction device as an example, the blade 200 may include one or more noise reduction devices. In the embodiment of multiple noise reduction devices, the multiple noise reduction devices may be arranged at intervals or in a continuous manner along the extension direction of the trailing edge.

[0104] Optionally, on the basis of complying with the size restrictions on the protrusions 11 and the grooves 12 in the noise reduction device in the aforementioned embodiments, the specific size parameters of the noise reduction device can be designed accordingly according to parameters such as the chord length, torsion 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] See also Figure 6 , Figure 6 3 is a schematic diagram of the structure of a wind turbine generator set 300 provided in one embodiment of the present application. In a third aspect, an embodiment of the present application provides a wind turbine generator set 300, comprising a blade 200 in any embodiment of the second aspect.

[0106] The blade 200 and the wind turbine generator set 300 in the embodiment of the present application 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, and this embodiment will not be repeated here.

[0107] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A blade noise reduction device, characterized in that: include: A connecting body, provided with a plurality of protrusions and grooves alternately distributed along a first direction; A sawtooth unit, wherein a plurality of the sawtooth units are connected to one end of the connecting body in the second direction, and each of the sawtooth units is arranged along the first direction; Among them, along the second direction, each of the sawtooth units is correspondingly provided with the groove, the orthographic projection of the protrusion is at least partially located between two adjacent sawtooth units and protrudes from the orthographic projection of the sawtooth unit, and the second direction intersects with the first direction.

2. The blade noise reduction device according to claim 1, characterized in that: 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.

3. The blade noise reduction device according to claim 1, characterized in that: Along the second direction, the maximum length dimension of the sawtooth unit is H, and along the third direction, the distance between the highest point and the lowest point of the protrusion is A, wherein H / 100≤A≤H / 5, and the first direction, the second direction and the third direction intersect with each other.

4. The blade noise reduction device according to claim 1, characterized in that: The orthographic projection of the groove wall enclosing the groove along the third direction is polygonal, and the first direction, the second direction and the third direction are arranged to intersect each other.

5. The blade noise reduction device according to claim 4, characterized in that: The orthographic projection of the groove wall enclosing the groove along the third direction is an axially symmetrical 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.

6. The blade noise reduction device according to claim 1, characterized in that: Along the second direction and from the connecting body to one side of the sawtooth unit, the width of the groove in the first direction increases first and then decreases.

7. The blade noise reduction device according to claim 6, characterized in that: Along the first direction, the maximum width of each of the grooves is equal to the width of the sawtooth units arranged opposite to each other, and every two adjacent grooves are arranged adjacent to each other at the maximum width position.

8. The blade noise reduction device according to claim 7, characterized in that: Every two adjacent grooves are connected at the maximum width position point, and along the second direction, the vertical distance between the connected maximum width position point and the tooth root of the sawtooth unit is S, and the maximum length dimension of the sawtooth unit is H, wherein S≤H.

9. The blade noise reduction device according to any one of claims 1 to 8, characterized in that: Along the second direction and from the connecting body to the direction of the sawtooth unit, the width of the protrusion in the first direction tends to gradually decrease, and the height in the third direction tends to gradually decrease, and the first direction, the second direction and the third direction are arranged to intersect each other.

10. The blade noise reduction device according to claim 9, characterized in that: The orthographic projection of the protrusion in the third direction is an axisymmetric structure having a second axis of symmetry, two adjacent grooves are symmetrically distributed relative to the second axis of symmetry, and two adjacent sawtooth units are symmetrically distributed relative to the second axis of symmetry.

11. The blade noise reduction device according to claim 10, characterized in that: 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; Among them, the side of the third surface facing away from the fourth surface is connected to the adjacent second surface and forms a first boundary line, the side of the fourth surface facing away from the third surface is connected to the adjacent first surface and forms a second boundary line, and the first boundary line and the second boundary line are symmetrically arranged in the second direction.

12. The blade noise reduction device according to any one of claims 1 to 8, characterized in that: Two adjacent protrusions are arranged in connection with each other in the first direction, and along the second direction, a connecting line of the orthographic projections of a plurality of the protrusions extends in a broken line trajectory or a curved line trajectory.

13. A blade, characterized in that: include: The blade noise reduction device according to any one of claims 1 to 12; The blade body has a leading edge and a trailing edge arranged opposite to each other in a second direction, the blade body has a windward surface and a leeward surface 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 arranged at the trailing edge, and at least one of the windward surface and the leeward surface is connected to the blade noise reduction device.

14. A wind turbine generator set, characterized in that: Comprising a blade as claimed in claim 13.

Images