Vortex generators and wind turbines

Abstract

The present invention relates to a vortex generator and a wind turbine generator set. The vortex generator includes: a base having a predetermined thickness, the base including a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged relative to each other in a first direction intersecting the thickness direction of the base, and the base being provided with a notch extending through the thickness direction; a fin group provided on the base, the fin group including fins arranged in pairs, one of the paired fins being connected to the first connecting portion and the other being connected to the second connecting portion, and the orthographic projection of each fin being staggered with the orthographic projection of the notch in the thickness direction. The vortex generator and wind turbine generator set provided by the embodiments of the present invention can effectively delay blade stall while reducing resistance to the fluid, thereby ensuring the power generation efficiency of the wind turbine generator set.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a vortex generator and a wind turbine generator set. Background Art

[0002] Blades are critical components of wind turbines, and their aerodynamic performance directly impacts their power generation efficiency. Stalling due to flow separation is unavoidable at the blade root, where the blade transitions from cylindrical to airfoil-shaped, reducing the blade's aerodynamic efficiency. The standard airfoil section from the mid-blade to the tip can also experience localized or widespread stall, resulting in power loss, if air density decreases, the blade surface becomes dirty, or the leading edge erodes / ices. To ensure blade aerodynamic performance, vortex generators are typically installed on the blades to control flow separation on the airfoil surface and delay stall.

[0003] Existing vortex generators have structural design deficiencies, resulting in a large resistance to the fluid from the base of the vortex generator after the vortex generator is connected to the blade, thereby affecting the power generation efficiency of the wind turbine generator set. Summary of the Invention

[0004] The embodiments of the present invention provide a vortex generator and a wind turbine generator set. The vortex generator can effectively delay blade stall and reduce resistance to fluid, thereby ensuring the power generation efficiency of the wind turbine generator set.

[0005] On the one hand, according to an embodiment of the present invention, a vortex generator is proposed, including: a base having a predetermined thickness, the base including a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged opposite to each other in a first direction intersecting with the thickness direction of the base, and a notch penetrating along the thickness direction is provided on the base; a fin group is provided on the base, the fin group including fins arranged in pairs, one of the fins arranged in a pair is connected to the first connecting portion and the other is connected to the second connecting portion, and along the thickness direction, the orthographic projection of each fin is staggered with the orthographic projection of the notch.

[0006] According to one aspect of an embodiment of the present invention, the base has a leading edge surface and a trailing edge surface oppositely arranged in a second direction, and the second direction intersects with the first direction and the thickness direction respectively, wherein the notch extends a predetermined length in the second direction.

[0007] According to one aspect of the embodiments of the present invention, at least one of the leading edge surface and the trailing edge surface is recessed along the second direction to form a notch.

[0008] According to one aspect of the embodiment of the present invention, the orthographic projection of the wall of the base forming the notch in the thickness direction is in the shape of an arc or a broken line, or a combination of the two.

[0009] According to one aspect of the embodiment of the present invention, the notch is located between the leading edge surface and the trailing edge surface, and the orthographic projection of the wall of the base forming the notch in the thickness direction is circular, elliptical or polygonal.

[0010] According to one aspect of the embodiments of the present invention, at least one of the leading edge surface and the trailing edge surface is inclined relative to the thickness direction.

[0011] According to one aspect of an embodiment of the present invention, the base has a first surface and a second surface that are opposite to each other in the thickness direction, and the fin is arranged to protrude from the second surface in the thickness direction; the leading edge surface intersects with the first surface to form a first intersection line and intersects with the second surface to form a second intersection line, and in the thickness direction, the orthographic projection of the first intersection line and the orthographic projection of the second intersection line are spaced apart and parallel along the second direction; and / or, the trailing edge surface intersects with the first surface to form a third intersection line and intersects with the second surface to form a fourth intersection line, and in the thickness direction, the orthographic projection of the third intersection line and the orthographic projection of the fourth intersection line are spaced apart and parallel along the second direction.

[0012] According to one aspect of an embodiment of the present invention, the first connecting portion has a first end face at one end facing away from the second connecting portion in the first direction, and the second connecting portion has a second end face at one end facing away from the first connecting portion in the first direction. In the second direction, one end of the first end face and the second end face converge toward one side close to each other and the other end disperse in a direction away from each other.

[0013] According to one aspect of an embodiment of the present invention, the base also includes a connecting wing located between the paired fins and connected to the fins, the orthographic projection of the connecting wing in the thickness direction is at least partially located within the orthographic projection of the notch, and a gap is formed between the connecting wing and the base in the thickness direction.

[0014] According to one aspect of an embodiment of the present invention, the connecting wing has a first guide surface and a second guide surface distributed sequentially in the thickness direction, the second guide surface is located on the side of the first guide surface away from the base, and the second guide surface is an arc-shaped surface convex in the thickness direction toward the side away from the first guide surface.

[0015] According to one aspect of the embodiment of the present invention, the first guide surface is an inclined surface, and the angle between the first guide surface and the thickness direction is in the range of 85° to 90°.

[0016] According to one aspect of the embodiments of the present invention, in the thickness direction, the maximum thickness dimension of the connecting wing is less than or equal to the maximum thickness dimension of the base.

[0017] According to one aspect of the embodiments of the present invention, the extension length of the connecting wing in the second direction is greater than or equal to the maximum thickness dimension of the fin in the thickness direction.

[0018] According to one aspect of the embodiments of the present invention, in the second direction, an extension length of the connecting wing is less than or equal to an extension length of the notch.

[0019] According to one aspect of the embodiments of the present invention, the base and the connecting wings are arranged sequentially along the second direction, and in the thickness direction, the orthographic projection of the connecting wings and the orthographic projection of the base at least partially overlap with each other.

[0020] According to one aspect of an embodiment of the present invention, the base includes two or more first base bodies and second base bodies spaced apart along a first direction, the first connecting portion is formed on the first base body, the second connecting portion is formed on the second base body, the notch is located between the first base body and the second base body, and the end faces of the first base body and the second base body in the second direction are each an arc-shaped surface.

[0021] According to one aspect of the embodiments of the present invention, a groove is provided on the base, and at least one end of the base in the thickness direction is recessed to form the groove.

[0022] On the other hand, according to an embodiment of the present invention, a wind turbine generator set is proposed, including: a blade, the blade having a blade surface; the above-mentioned vortex generator, the vortex generator is connected to the blade surface through a base, and the fins arranged in pairs are distributed at intervals along the axial direction of the blade.

[0023] According to the vortex generator and wind turbine generator set provided by the embodiment of the present invention, the vortex generator includes a base and a fin group. The vortex generator can be connected to the blade through one side of the base in the thickness direction to achieve the connection between the fin group and the blade. The fins arranged in pairs in the fin group can control the flow separation on the blade airfoil surface and delay stall. Since a notch is provided on the base, and the orthographic projection of each fin is staggered with the orthographic projection of the notch along the thickness direction, the base can not only ensure the connection strength between the fin and the blade, but also reduce the area of ​​the fluid flowing through the base in the streamline direction, reduce the resistance of the base to the fluid, and ensure the power generation efficiency of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] Figure 1 1 is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0026] Figure 2 1 is a schematic structural diagram of a vortex generator according to an embodiment of the present invention;

[0027] Figure 3 is a top view of a vortex generator according to an embodiment of the present invention;

[0028] Figure 4 is a top view of a vortex generator according to another embodiment of the present invention;

[0029] Figure 5 is a top view of a vortex generator according to another embodiment of the present invention;

[0030] Figure 6 is a top view of a vortex generator according to another embodiment of the present invention;

[0031] Figure 7 is a top view of a vortex generator according to another embodiment of the present invention;

[0032] Figure 8 is a top view of a vortex generator according to another embodiment of the present invention;

[0033] Figure 9 is a top view of a vortex generator according to another embodiment of the present invention;

[0034] Figure 10 yes Figure 9 A top view of the vortex generator shown;

[0035] Figure 11 1 is a schematic structural diagram of a vortex generator according to another embodiment of the present invention;

[0036] Figure 12 yes Figure 11 A top view of the vortex generator shown;

[0037] Figure 13 yes Figure 12 Cross-sectional view along AA direction;

[0038] Figure 14 1 is a schematic diagram of fluid flow in a vortex generator according to another embodiment of the present invention and a vortex generator in the prior art;

[0039] Figure 15 1 is a schematic structural diagram of a vortex generator according to another embodiment of the present invention;

[0040] Figure 16 is a cross-sectional view of a base of a vortex generator according to another embodiment of the present invention in a second direction;

[0041] Figure 17 is a cross-sectional view of a base of a vortex generator according to another embodiment of the present invention in a second direction;

[0042] Figure 18 It is a cross-sectional view of a base of a vortex generator according to another embodiment of the present invention in a second direction.

[0043] in:

[0044] 100- vortex generator;

[0045] 10-base; 11-first connecting portion; 12-second connecting portion; 13-notch; 10a-front edge surface; 10b-rear edge surface; 10c-first surface; 10d-second surface; 10e-first end surface; 10f-second end surface; 14a-first seat; 14b-second seat; 15-groove; MM-first intersection line; NN-second intersection line; PP-third intersection line; QQ-fourth intersection line;

[0046] 20- fin group; 21- fin;

[0047] 30-connecting wing; 31-first guide surface; 32-second guide surface;

[0048] 200-tower;

[0049] 300-cabin;

[0050] 400-generator;

[0051] 500-impeller; 510-hub; 520-blade;

[0052] X-thickness direction; Y-first direction; Z-second direction.

[0053] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0054] The features and exemplary embodiments of various aspects of the present invention are described in detail below. In the detailed description that follows, many specific details are set forth in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is intended only to provide a better understanding of the present invention by illustrating examples of the present invention. In the accompanying drawings and the following description, at least some of the well-known structures and techniques are not shown in order to avoid unnecessary ambiguity in the present invention; and, for clarity, the sizes of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0055] The directional words appearing in the following description refer to the directions shown in the figures and do not limit the specific structure of the vortex generator and wind turbine generator set of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, 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 a direct connection or an indirect connection. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0056] like Figure 1 As shown, an embodiment of the present invention provides a wind turbine generator set, comprising a tower 200, a nacelle 300, a generator 400, and an impeller 500. The nacelle 300 is disposed at the top of the tower 200, and the generator 400 is disposed in the nacelle 300. It can be located inside the nacelle 300, or it can be located outside the nacelle 300. The impeller 500 includes a hub 510 and two or more blades 520 connected to the hub 510, and the two or more blades 520 are spaced apart around the central axis of the hub 510. The impeller 500 is connected to the rotor of the generator 400 through its hub 510. When wind force acts on the blades 520, it drives the hub 510 and the rotor of the generator 400 to rotate relative to the stator, thereby meeting the power generation requirements of the wind turbine generator set.

[0057] During operation, blades 520 inevitably experience stall due to flow separation at the transition zone from cylindrical to airfoil at the blade root, reducing aerodynamic efficiency at the blade root. Furthermore, the portion of the blade from the middle to the tip, which consists of a standard airfoil, experiences reduced air density. This can also lead to localized or widespread stall, resulting in power loss, if the blade 520 surface becomes dirty or the leading edge of the blade 520 corrodes or freezes. To ensure aerodynamic performance, vortex generators 100 are typically installed on blades 520 to control flow separation on the airfoil surface and delay stall.

[0058] In the existing vortex generator, the base of the vortex generator has a larger coverage area on the blade 520, so that after the vortex generator is connected to the blade, the base 10 in the vortex generator 100 has a larger resistance to the fluid, which affects the power generation efficiency of the wind turbine generator set.

[0059] In order to solve the above technical problems, the embodiment of the present invention further provides a vortex generator 100, which can effectively delay the stall of the blade 520 and reduce the resistance to the fluid, thereby ensuring the power generation efficiency of the wind turbine generator set. Figures 2 to 17 A vortex generator 100 for a generator according to an embodiment of the present invention is described in detail.

[0060] like Figure 2 as well as Figure 3As shown, a vortex generator 100 provided in an embodiment of the present invention includes a base 10 and a fin assembly 20. The base 10 has a predetermined thickness and includes a first connecting portion 11 and a second connecting portion 12. The first connecting portion 11 and the second connecting portion 12 are arranged opposite each other in a first direction Y intersecting with the thickness direction X of the base 10. The base 10 is provided with a notch 13 extending through the thickness direction X. The fin assembly 20 is disposed on the base 10 and includes fins 21 arranged in pairs. One of the paired fins 21 is connected to the first connecting portion 11 and the other is connected to the second connecting portion 12. Along the thickness direction X, the orthographic projection of each fin 21 is staggered with the orthographic projection of the notch 13.

[0061] The vortex generator 100 provided in the embodiment of the present invention can be produced or sold separately as an independent component. Of course, in some embodiments, the vortex generator 100 can also be used in the wind turbine provided in the above embodiment and serve as a component of the wind turbine. When used in a wind turbine, the vortex generator 100 provided in the embodiment of the present invention can be connected to the blade 520 through one side of the base 10 in the thickness direction X, thereby achieving a connection between the fin group 20 and the blade 520. The fins 21 arranged in pairs in the fin group 20 can be spaced apart along the axial direction of the blade 520 to control flow separation on the airfoil surface of the blade 520 and delay stall. Because the base 10 is provided with a notch 13, and the orthographic projections of each fin 21 are staggered with the orthographic projections of the notch 13 in the thickness direction X, the base 10 can not only ensure the connection strength between the fin 21 and the blade 520, but also reduce the area of ​​the fluid flowing through the base in the streamline direction, reducing the resistance of the base 10 to the fluid, and ensuring the power generation efficiency of the wind turbine.

[0062] Optionally, the size of the base 10 in the thickness direction X can be set according to the relative positions of the paired fins 21 and the connection strength between each of them and the blade 520, as long as the connection strength between the fins 21 and the blade 520 and the positional relationship requirements between the paired fins 21 can be met.

[0063] Optionally, the notch 13 provided on the base 10 can adopt various shapes, and can be a non-enclosed notch 13, such as an arc-shaped notch, a broken line notch, etc. Of course, it can also be a closed notch, such as a circular notch, an elliptical notch, a polygonal notch, etc., as long as it can meet the connection requirements between the base 10 and the blade 520 and can reduce the resistance of the base 10 to the fluid.

[0064] Optionally, the base 10 as a whole may be a plate-shaped structure, and the first direction Y may be perpendicular to the thickness direction X.

[0065] As an optional embodiment, the vortex generator 100 provided in an embodiment of the present invention has a base 10 having a leading edge surface 10a and a trailing edge surface 10b arranged opposite to each other in a second direction Z. The second direction Z intersects the first direction Y and the thickness direction X, respectively. The notch 13 extends a predetermined length in the second direction Z. Because the first connecting portion 11 and the second connecting portion 12 are spaced apart and opposite to each other in the first direction Y, that is, the paired fins 21 are spaced apart and opposite to each other in the first direction Y, fluid flows in the second direction Z and is controlled by the fins 21 to separate and flow along the airfoil surface of the blade 520. By providing the base 10 with the leading edge surface 10a and the trailing edge surface 10b in the second direction Z and extending the notch 13 to a predetermined length in the second direction Z, the area of ​​the base 10 flowing through in the streamline direction can be reliably reduced, thereby lowering the resistance of the base 10 to the fluid and ensuring the power generation efficiency of the wind turbine generator set.

[0066] Optionally, the second direction Z is perpendicular to the first direction Y and the thickness direction X. This ensures that the vortex generator 100 separates the flow on the airfoil surface of the blade 520 to delay the stall of the blade 520 .

[0067] In some optional embodiments, the vortex generator 100 provided by the embodiment of the present invention has at least one of the leading edge surface 10a and the trailing edge surface 10b of the base 10 recessed along the second direction Z to form a notch 13. The above arrangement facilitates the formation of the notch 13.

[0068] like Figure 2 as well as Figure 3 As shown, optionally, only the front edge surface 10 a of the base 10 may be recessed along the second direction Z to form a notch 13 .

[0069] like Figure 4 As shown, only the rear edge surface 10 b of the base 10 may be recessed along the second direction Z to form the notch 13 .

[0070] like Figures 5 to 7 As shown, of course, in some embodiments, the leading edge surface 10a and the trailing edge surface 10b of the base 10 can also be recessed along the second direction Z to form a notch 13, thereby reducing the coverage area of ​​the blade 520 when the base 10 is connected to the blade 520 and reducing the resistance of the base 10 to the fluid.

[0071] As an optional embodiment, the orthographic projection of the wall surface of the base 10 forming the notch 13 in the thickness direction X is either an arc shape or a broken line shape, or a combination of both. This configuration can reduce the coverage area of ​​the blade 520 when the vortex generator 100 is used on the blade 520, while also guiding the flow direction of the fluid, thereby meeting the performance requirements of the vortex generator 100.

[0072] Optionally, the orthographic projection of the wall surface of each notch 13 formed in the base 10 in the thickness direction X may be in the shape of an arc or a broken line, or a combination of the two.

[0073] like Figure 2 as well as Figure 3 As shown, for example, the front edge surface 10a of the base 10 can be recessed along the second direction Z to form a notch 13, and the wall surface of the base 10 forming the notch 13 can be projected in an arc shape in the thickness direction X.

[0074] like Figure 4 As shown, in some examples, the rear edge surface 10b of the base 10 may be recessed along the second direction Z to form a notch 13, and the orthographic projection of the notch 13 of the base 10 in the thickness direction X may be arc-shaped.

[0075] like Figure 5 As shown, in some embodiments, the front edge surface 10a and the rear edge surface 10b of the base 10 can also be recessed along the second direction Z to form a notch 13, and the orthographic projection of the wall surface of each notch 13 of the base 10 in the thickness direction X is arc-shaped.

[0076] Of course, the above-mentioned limitation that the orthographic projection of the wall surface of each notch 13 formed by the base 10 in the thickness direction X is an arc shape is an optional implementation method, and the orthographic projection of the wall surface of each notch 13 formed by the base 10 in the thickness direction X can also be a broken line shape.

[0077] like Figure 6 As shown, optionally, taking the formation of notches 13 at the leading edge surface 10a and the formation of notches 13 at the trailing edge surface 10b as an example, the orthographic projection of the wall surface of the notch 13 at the leading edge surface 10a formed by the base 10 in the thickness direction X may be a broken line, which may include a first line segment aa and a second line segment bb, and one end of the first line segment aa and the second line segment bb may intersect with each other. Alternatively, the orthographic projection of the wall surface of the notch 13 at the trailing edge surface 10b formed by the base 10 in the thickness direction X may be a broken line, which may include a third line segment cc and a fourth line segment dd, and one end of the third line segment cc and the fourth line segment dd may intersect with each other.

[0078] Optionally, when the orthographic projection of the wall surface of the base 10 forming each notch 13 in the thickness direction X is in the shape of a broken line, the form of the broken line is not limited to the above embodiment.

[0079] like Figure 7As shown, in some embodiments, the orthographic projection of the wall surface of the notch 13 formed at the leading edge surface 10a of the base 10 in the thickness direction X may include a first line segment ee, a second line segment ff, and a third line segment gg, wherein the first line segment ee, the second line segment ff, and the third line segment gg are arranged sequentially, and two adjacent line segments intersect. Alternatively, the orthographic projection of the wall surface of the notch 13 formed at the trailing edge surface 10b of the base 10 in the thickness direction X may include a fourth line segment hh, a fifth line segment ii, and a sixth line segment jj, wherein the fourth line segment hh, the fifth line segment ii, and the sixth line segment jj are arranged sequentially, and two adjacent line segments intersect. This form of notch 13 can also reduce the obstruction to the fluid and ensure the performance requirements of the vortex generator 100.

[0080] It is understandable that the wall surface of each notch 13 formed by the base 10 is not limited to being arc-shaped or broken line-shaped, but can also be a combination of the two, as long as it can reduce the area occupied by the vortex generator 100 on the blade 520 when used in a wind turbine generator set and reduce the obstruction to the fluid.

[0081] At the same time, the orthographic projection of the wall surface of the notch 13 at the position where the leading edge surface 10a of the base 10 is formed in the thickness direction X and the orthographic projection of the wall surface of the notch 13 at the position where the trailing edge surface 10b of the base 10 is formed in the thickness direction X can be the same, or of course they can be different. For example, both can be arc-shaped, or both can be broken line-shaped. Of course, one can also be arc-shaped and the other can be broken line-shaped, which is not specifically limited here.

[0082] It is understandable that the vortex generator 100 provided in the above embodiments is illustrated by taking as an example that at least one of the leading edge surface 10a and the trailing edge surface 10b is recessed along the second direction Z to form the notch 13. This is an optional implementation, but is not limited to the above method.

[0083] like Figure 8 As shown, in some other examples, the notch 13 may also be located between the leading edge surface 10a and the trailing edge surface 10b. The orthographic projection of the wall of the base 10 forming the notch 13 in the thickness direction X is closed and may be a polygon, such as a quadrilateral. In some embodiments, the orthographic projection of the wall of the base 10 forming the notch 13 in the thickness direction X may also be circular, elliptical, or polygonal. This can also reduce the area occupied by the vortex generator 100 on the blade 520 when used in a wind turbine, thereby reducing the obstruction to the fluid.

[0084] like Figure 9 as well as Figure 10As shown, as an optional embodiment, in the vortex generator 100 provided in the above-mentioned embodiments of the present invention, at least one of the leading edge surface 10a and the trailing edge surface 10b is arranged obliquely relative to the thickness direction X. This arrangement reduces the flow separation effect caused by the thickness of the base 10 when the fluid flows through, further reduces the obstruction of the base 10 to the fluid, and allows the fluid to flow more smoothly between the two fins 21 arranged in pairs.

[0085] Optionally, the leading edge surface 10a can be tilted relative to the thickness direction X, and the trailing edge surface 10b can be tilted relative to the thickness direction X. Of course, in some examples, the leading edge surface 10a and the trailing edge surface 10b can also be tilted relative to the thickness direction X respectively.

[0086] In some optional embodiments, the base 10 has a first surface 10c and a second surface 10d disposed opposite each other in the thickness direction X. The fin 21 is disposed so as to protrude from the second surface 10d in the thickness direction X. The leading edge surface 10a intersects with the first surface 10c to form a first intersection line MM and intersects with the second surface 10d to form a second intersection line NN. In the thickness direction X, the orthographic projection of the first intersection line MM and the orthographic projection of the second intersection line NN are spaced apart and parallel to each other along the second direction Z. Through the above arrangement, the leading edge surface 10a of the base 10 can be inclined relative to the thickness direction X to reduce obstruction of the fluid by the leading edge surface 10a.

[0087] Optionally, when the first intersection line MM is an arcuate line, the second intersection line NN is also an arcuate line, the first intersection line MM and the second intersection line NN transition with equal curvature, and the transition surface is a conical surface. If the first intersection line MM is a straight line or a broken line, the second intersection line NN is correspondingly a straight line or a broken line, and the corresponding transition surface between the first intersection line MM and the second intersection line NN is a plane or two or more sequentially intersecting planes.

[0088] As an optional embodiment, the trailing edge surface 10b intersects the first surface 10c to form a third intersection line PP, and intersects the second surface 10d to form a fourth intersection line QQ. In the thickness direction X, the orthographic projection of the third intersection line PP and the orthographic projection of the fourth intersection line QQ are spaced apart and parallel along the second direction Z. This arrangement allows the trailing edge surface 10b of the base 10 to be tilted relative to the thickness direction X, thereby reducing the obstruction of the trailing edge surface 10b to the fluid.

[0089] Optionally, when the third intersection line PP is an arc line, the fourth intersection line QQ is also an arc line, the third intersection line PP and the fourth intersection line QQ have equal curvature transitions, and the transition surface is a conical surface. If the third intersection line PP is a straight line or a broken line, the fourth intersection line QQ is correspondingly a straight line or a broken line, and the transition surface between the third intersection line PP and the fourth intersection line QQ is a plane or two or more planes intersecting in sequence.

[0090] In some optional embodiments, the first connecting portion 11 has a first end face 10e at one end facing away from the second connecting portion 12 in the first direction Y, and the second connecting portion 12 has a second end face 10f at one end facing away from the first connecting portion 11 in the first direction Y. In the second direction Z, the first end face 10e and the second end face 10f converge toward one side close to each other at one end and disperse toward a direction away from each other at the other end. Through the above arrangement, the paired fins 21 can converge toward one side close to each other at one end in the second direction Z and disperse toward a direction away from each other at the other end, which is beneficial to controlling the flow separation on the airfoil surface of the blade 520 and delaying stall. Moreover, on the basis of satisfying the arrangement of the paired fins 21 and the connection strength between the fins 21 and the blade 520, the coverage area of ​​the base 10 on the blade 520 can be further reduced, thereby reducing the obstruction to the fluid.

[0091] Optionally, in a specific implementation, the paired fins 21 can be stacked with the base 10 when connected to the base 10, for example, they can be stacked on the second surface 10d of the base 10 in the thickness direction X and connected to the second surface 10d by bonding or other means. Of course, this is an optional connection method. In some other embodiments, one of the paired fins 21 can be connected to the first end surface 10e of the first connecting portion 11 that is away from the second connecting portion 12 in the first direction Y, and the other fin 21 can be connected to the second end surface 10f of the second connecting portion 12 that is away from the first connecting portion 11 in the first direction Y. As long as the relative positions of the paired fins 21 can be fixed and the connection requirements between the blades 520 can be met, it is acceptable.

[0092] like Figures 11 to 13 As shown, as an optional embodiment, the fins 21 arranged in pairs can be fixed only by the base 10. Of course, this is an optional embodiment. In some embodiments, other connecting structures can also be connected between the fins 21 arranged in pairs.

[0093] As an optional embodiment, the base 10 further includes a connecting wing 30 positioned between and connected to the paired fins 21. The orthographic projection of the connecting wing 30 in the thickness direction X is at least partially located within the orthographic projection of the notch 13, and a gap is formed between the connecting wing 30 and the base 10 in the thickness direction X. The provision of the connecting wing 30 can improve the positioning of the paired fins 21 and the strength of their connection. Furthermore, when the vortex generator 100 is used with a blade 520, it can be connected to the blade 520 through the base 10. Because a gap is formed between the connecting wing 30 and the base 10 in the thickness direction X, when the vortex generator 100 is connected to the blade 520 through the base 10, a gap is also formed between the connecting wing 30 and the blade surface of the blade 520. This allows the blade 520 to generate favorable boundary layer flow in the area where the vortex generator 100 is located during operation, resulting in a fuller boundary layer velocity profile and reduced flow losses caused by the base 10.

[0094] As an optional embodiment, the vortex generator 100 provided in an embodiment of the present invention has a connecting wing 30 having a first guide surface 31 and a second guide surface 32 distributed sequentially in the thickness direction X. The second guide surface 32 is located on the side of the first guide surface 31 facing away from the base 10. The second guide surface 32 is an arc-shaped surface that convexly extends away from the first guide surface 31 in the thickness direction X. This arrangement allows the second guide surface 32 to guide the streamlines of the fluid toward the surface of the blade 520. The first guide surface 31 is a straight or airfoil-shaped design, which facilitates the formation of the connecting wing 30 and can guide the airflow.

[0095] As an optional embodiment, the first guide surface 31 is an inclined surface, and the angle between the first guide surface 31 and the thickness direction X ranges from 85° to 90°, including 85°. When the vortex generator 100 is used on and connected to the blade 520, the first guide surface 31 forms an angle within the range of 0° to 5° with the surface of the blade 520. This means that the connecting wing 30 structure has a designed positive angle of attack, and the gap formed between the first guide surface 31 and the surface of the blade 520 gradually decreases in the second direction Z. This ensures that the distance from the leading edge of the connecting wing 30, located near the base 10, to the surface of the blade 520 is greater than the distance from the trailing edge of the connecting wing 30, located away from the base 10, to the surface of the blade 520, thereby accelerating the fluid flowing through it.

[0096] like Figure 14As shown in FIG. 1 , the vortex generator 100 provided in the embodiment of the present invention is compared with the base solution in the prior art through its local flow field and velocity distribution diagram. The vortex generator 100 provided in the embodiment of the present invention takes two points B in the wake area of ​​the base 10, while the prior art base takes point A in the wake area of ​​the base. For the base in the prior art, since its leading edge and trailing edge surfaces are not inclined, and there is no gap connecting the wing 30, the base 10 and the blade 520, the wake area will produce local separation and backflow, forming the following Figure 14 The velocity distribution of point A in the middle. The vortex generator 100 provided by the embodiment of the present invention has at least one of the leading edge surface 10a and the trailing edge surface 10b inclined and the connecting wing 30 structure. Through the connecting wing 30 structure, the flow velocity of the airflow flowing through the base 10 is accelerated, and the boundary layer is fuller, thereby reducing or even eliminating the flow resistance and loss caused by the base 10, forming a Figure 14 Velocity distribution at point B.

[0097] As an optional embodiment, the vortex generator 100 provided in the embodiment of the present invention can have an airfoil design of the connecting wing 30 that adopts a thin airfoil shape design such as NACA0012 to guide the streamline of the fluid to flow toward the surface of the blade 520.

[0098] In some optional embodiments, the maximum thickness of the connecting wing 30 in the thickness direction X is less than or equal to the maximum thickness of the base 10. Through the above configuration, the thickness of the connecting wing 30 can be minimized, and the resistance to the fluid can be minimized while meeting the requirements of the position between the fins 21 and the connection strength.

[0099] In some optional embodiments, the extension length of the connecting wing 30 in the second direction Z is greater than or equal to the maximum thickness of the fin 21 in the thickness direction X. Through the above configuration, the extension length of the connecting wing 30 in the second direction Z can be as long as possible, so as to better accelerate the fluid flowing through the vortex generator 100.

[0100] In some optional embodiments, the extension length of the connecting wing 30 in the second direction Z is less than or equal to the extension length of the notch 13. This arrangement allows the connecting wing 30 to be confined within the region of the notch 13. While ensuring an acceleration effect on the fluid, it also avoids increasing the overall footprint of the vortex generator 100 due to an excessively long connecting wing 30, thereby reducing resistance to the fluid.

[0101] As an optional implementation, when the vortex generator 100 provided in an embodiment of the present invention includes a connecting wing 30, the base 10 and the connecting wing 30 are arranged in sequence along the second direction Z, and in the thickness direction X, the orthographic projection of the connecting wing 30 and the orthographic projection of the base 10 at least partially overlap with each other. Of course, this is an optional implementation.

[0102] like Figure 15 As shown, in some other embodiments, the base 10 may include two or more first base bodies 14a and second base bodies 14b spaced apart along the first direction Y, with the first connecting portion 11 formed on the first base body 14a, the second connecting portion 12 formed on the second base body 14b, the notch 13 located between the first base body 14a and the second base body 14b, and the end surfaces of the first base body 14a and the second base body 14b in the second direction Z being arcuate surfaces. This can also meet the performance requirements of the vortex generator 100 and reduce the resistance to the fluid.

[0103] like Figures 16 to 18 As shown, as an optional embodiment, the vortex generator 100 provided in the above embodiments of the present invention further includes a groove 15 provided on the base 10. At least one end of the base 10 in the thickness direction X is recessed to form the groove 15. By providing the groove 15, the size of the base 10 in the thickness direction X can be reduced, directly reducing the projected area in the flow direction, which is equivalent to reducing the area blocking the flow of fluid, further reducing the resistance to the fluid.

[0104] like Figure 16 As shown, optionally, a groove 15 may be formed at one end of the base 10 in the thickness direction X. Figure 17 as well as Figure 18 As shown, in some other examples, grooves 15 may be formed at both ends of the base 10 in the thickness direction X to meet the requirement of reducing the thickness of the base 10 .

[0105] Optionally, in the thickness direction X, the thickness of the first connecting portion 11 and the second connecting portion 12 of the base 10 for connecting to the fin 21 are respectively greater than the thickness of the area between the first connecting portion 11 and the second connecting portion 12, thereby ensuring the connection strength between the fin 21 and the blade 520.

[0106] When the vortex generators 100 provided in the above-mentioned embodiments of the present invention are used in a wind turbine, the number of vortex generators 100 included in the blades 520 of each wind turbine can be set according to demand, and can be one or more than two. When there are more than two, the fins 21 arranged in pairs are distributed at intervals along the axial direction of the blade 520.

[0107] Optionally, when the vortex generator 100 does not include the connecting wing 30, the application range of the vortex generator 100 along the axial direction of the blade 520, from the blade root to the blade tip, may be 0-100%. When the vortex generator 100 includes the connecting wing 30, the application range of the vortex generator 100 along the axial direction of the blade 520, from the blade root to the blade tip, may be 0-70%. The specific position of the vortex generator 100 on the blade 520 to which it is applied can be determined based on the structural form of the vortex generator 100.

[0108] The vortex generator 100 and wind turbine generator set provided by the embodiment of the present invention include a base 10 and a fin group 20. The vortex generator 100 can be connected to the blade 520 through one side of the base 10 in the thickness direction X, thereby realizing the connection between the fin group 20 and the blade 520. The paired fins 21 of the fin group 20 can control the flow separation on the airfoil surface of the blade 520 and delay stall. Because the base 10 is provided with a notch 13, and the orthographic projection of each fin 21 is staggered with the orthographic projection of the notch 13 along the thickness direction X, the base 10 can not only ensure the connection strength between the fin 21 and the blade 520, but also reduce the area of ​​the base 10, reduce the resistance of the base 10 to the fluid, and ensure the power generation efficiency of the wind turbine generator set. The wind turbine generator set provided by the embodiment of the present invention, because it includes the vortex generator 100 provided by each of the above embodiments, can improve the utilization rate of wind energy and have higher power generation efficiency.

[0109] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A vortex generator (100), characterized in that: include: A base (10) having a predetermined thickness, the base (10) comprising a first connecting portion (11) and a second connecting portion (12), the first connecting portion (11) and the second connecting portion (12) being arranged relative to each other in a first direction (Y) intersecting a thickness direction (X) of the base (10), and a notch (13) penetrating along the thickness direction (X) being provided on the base (10); A fin group (20) is arranged on the base (10), the fin group (20) includes fins (21) arranged in pairs, one of the fins (21) arranged in pairs is connected to the first connecting portion (11) and the other is connected to the second connecting portion (12), along the thickness direction (X), the orthographic projection of each fin (21) and the orthographic projection of the notch (13) are staggered, and the fins (21) arranged in pairs in a second direction (Z) intersecting the thickness direction (X) have one end converging toward a side close to each other and the other end dispersing in a direction away from each other; The base (10) further comprises a connecting wing (30) located between the fins (21) arranged in pairs and connected to the fins (21), the orthographic projection of the connecting wing (30) in the thickness direction (X) being at least partially located within the orthographic projection of the notch (13), and a gap being formed between the connecting wing (30) and the base (10) in the thickness direction (X), the connecting wing (30) having a first guide surface (31) and a second guide surface (32) distributed in sequence in the thickness direction (X), the second guide surface (32) being located on the side of the first guide surface (31) facing away from the base (10), the second guide surface (32) being an arcuate surface protruding toward the side away from the first guide surface (31) in the thickness direction (X), and the side of the fin (21) facing away from the base (10) protruding from the second guide surface (32) along the thickness direction (X).

2. The vortex generator (100) according to claim 1, characterized in that The base (10) has a front edge surface (10a) and a rear edge surface (10b) arranged opposite to each other in the second direction (Z), and the second direction (Z) intersects with the first direction (Y) and the thickness direction (X) respectively, wherein the notch (13) extends a predetermined length in the second direction (Z).

3. The vortex generator (100) according to claim 2, characterized in that At least one of the leading edge surface (10a) and the trailing edge surface (10b) is recessed along the second direction (Z) to form the notch (13).

4. The vortex generator (100) according to claim 3, characterized in that The orthographic projection of the wall surface of the base (10) forming the notch (13) in the thickness direction (X) is in the shape of an arc or a broken line, or a combination of the two.

5. The vortex generator (100) according to claim 2, characterized in that The notch (13) is located between the leading edge surface (10a) and the trailing edge surface (10b); the orthographic projection of the wall of the base (10) forming the notch (13) in the thickness direction (X) is circular, elliptical or polygonal.

6. The vortex generator (100) according to claim 2, characterized in that At least one of the leading edge surface (10a) and the trailing edge surface (10b) is arranged to be inclined relative to the thickness direction (X).

7. The vortex generator (100) according to claim 6, characterized in that The base (10) has a first surface (10c) and a second surface (10d) arranged opposite to each other in the thickness direction (X), and the fin (21) is arranged to protrude from the second surface (10d) in the thickness direction (X); The leading edge surface (10a) intersects with the first surface (10c) to form a first intersection line (MM) and intersects with the second surface (10d) to form a second intersection line (NN), and in the thickness direction (X), the orthographic projection of the first intersection line (MM) and the orthographic projection of the second intersection line (NN) are spaced apart and arranged in parallel along the second direction (Z); and / or, the trailing edge surface (10b) intersects with the first surface (10c) to form a third intersection line (PP) and intersects with the second surface (10d) to form a fourth intersection line (QQ), and in the thickness direction (X), the orthographic projection of the third intersection line (PP) and the orthographic projection of the fourth intersection line (QQ) are spaced apart and arranged in parallel along the second direction (Z).

8. The vortex generator (100) according to claim 2, characterized in that The first connecting portion (11) has a first end surface (10e) at one end facing away from the second connecting portion (12) in the first direction (Y), and the second connecting portion (12) has a second end surface (10f) at one end facing away from the first connecting portion (11) in the first direction (Y). In the second direction (Z), one end of the first end surface (10e) and the second end surface (10f) converge toward one side close to each other and the other end disperse in a direction away from each other.

9. The vortex generator (100) according to claim 1, characterized in that The first flow-guiding surface (31) is an inclined surface, and the angle between the first flow-guiding surface (31) and the thickness direction (X) is in the range of 85° to 90°.

10. The vortex generator (100) according to claim 1, characterized in that In the thickness direction (X), the maximum thickness dimension of the connecting wing (30) is less than or equal to the maximum thickness dimension of the base (10); and / or, the extension length of the connecting wing (30) in the second direction (Z) is greater than or equal to the maximum thickness dimension of the fin (21) in the thickness direction (X); And / or, in the second direction (Z), the extension length of the connecting wing (30) is less than or equal to the extension length of the notch (13).

11. The vortex generator (100) according to claim 1, characterized in that The base (10) and the connecting wing (30) are arranged in sequence along the second direction (Z), and in the thickness direction (X), the orthographic projection of the connecting wing (30) and the orthographic projection of the base (10) at least partially overlap with each other; Alternatively, the base (10) includes two or more first base bodies (14a) and second base bodies (14b) spaced apart along the first direction (Y), the first connecting portion (11) is formed on the first base body (14a), the second connecting portion (12) is formed on the second base body (14b), the notch (13) is located between the first base body (14a) and the second base body (14b), and the end faces of the first base body (14a) and the second base body (14b) in the second direction (Z) are arcuate surfaces.

12. The vortex generator (100) according to any one of claims 1 to 11, characterized in that A groove (15) is provided on the base (10), and at least one end of the base (10) in the thickness direction (X) is recessed to form the groove (15).

13. A wind turbine generator set, characterized in that: include: a blade (520), wherein the blade (520) has a blade surface; The vortex generator (100) according to any one of claims 1 to 12, wherein the vortex generator (100) is connected to the blade surface via the base (10), and the fins (21) arranged in pairs are spaced apart along the axial direction of the blade (520).

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