Wing knife device for fan blade, fan blade assembly and wind generating set

Abstract

The utility model provides a winged knife device for a fan blade, a fan blade assembly and a wind generating set. According to the utility model, the winged knife device comprises a knife holder which is provided with a first surface and a second surface which are opposite to each other, and the first surface is a mounting surface for mounting the winged knife device on the fan blade; the cutter body is fixed to the second surface of the cutter holder and extends from the second surface in the direction away from the first surface, the cutter body is provided with a first end and a second end which are opposite to each other in the length direction, the first end has a first height in the height direction perpendicular to the length direction, and the second end has a second height in the height direction perpendicular to the length direction. The second end has a second height Hr in the height direction, and the first height Hl is smaller than the second height. According to the winged knife device, the size of a stall separation area on a fan blade can be reduced so as to improve the aerodynamic characteristics of an impeller.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a wing blade device for a fan blade, a fan blade assembly and a wind power generator set. Background Art

[0002] Blades are key components for wind turbines to effectively capture wind energy. Stall is one of the important reasons for the reduction of efficiency of horizontal axis wind turbines, and flow separation near the blade surface is one of the main causes of wind turbine stall.

[0003] Affected by factors such as the blade airfoil, the airflow will experience different degrees of separation after passing through the leading edge of the blade. The airflow in the separation area will form a larger vortex due to the loss of the airfoil effect, which will increase the operating resistance of the blade and reduce the wind energy conversion efficiency of the unit.

[0004] In addition, during the actual operation of the unit, a pressure difference will be generated between the pressure surface and the suction surface of the blade. Under the action of the pressure difference, the boundary layer will flow from the root to the tip and accumulate at the tip, resulting in airflow separation, forming a tip vortex, generating induced drag, and the lift of the tip part will drop sharply. At the same time, the Reynolds number of the fluid in the root area is much lower than that in the tip area, and the flow is greatly affected by the viscous force. The gas near the boundary layer near the root area has a tendency to flow to the tip of the blade under the combined action of the centrifugal force and Coriolis force generated by the rotation of the blade. The change in the pitch of the blade at each position causes the airflow on the blade surface to form a radial flow from the center to the tip of the blade, resulting in a tendency for the flow separation to expand from the root to the tip of the blade, resulting in reduced aerodynamic efficiency.

[0005] If there is a large stall separation area on the blade surface, it will cause the impeller to stall, thus affecting the stable operation of the unit. Utility Model Content

[0006] One object of the utility model is to provide a blade device, a fan blade assembly and a wind turbine generator set which can reduce the size of the stall separation area on the fan blade to improve the aerodynamic characteristics of the impeller.

[0007] According to an embodiment of the utility model, a wing knife device for a fan blade is provided, the wing knife device comprising: a knife seat, having a first surface and a second surface opposite to each other, the first surface being a mounting surface for mounting the wing knife device on the fan blade; a knife body, fixed to the second surface of the knife seat, and extending from the second surface in a direction away from the first surface, wherein the knife body has a first end and a second end opposite to each other in a length direction, the first end having a first height in a height direction perpendicular to the length direction, and the second end having a second height H in the height direction. r , the first height Hl is smaller than the second height.

[0008] Optionally, along the length direction, from the first end to the second end, the height of the blade body in the height direction gradually increases.

[0009] Optionally, the knife body is arranged at the center of the knife seat in the width direction and is perpendicular to the knife seat, and the width direction is perpendicular to the length direction and the height direction.

[0010] Optionally, the blade body has a bottom fixed to the second surface and a top opposite to the bottom in the height direction, a dimension of the top in a width direction is smaller than a dimension of the bottom in the width direction, and the width direction is perpendicular to the length direction and the height direction.

[0011] Optionally, the tool holder has a leading edge end and a trailing edge end opposite to each other in the length direction, the leading edge end has a smaller dimension in the width direction than the trailing edge end, and the width direction is perpendicular to the length direction and the height direction.

[0012] Optionally, the wing blade device is divided into at least two wing blade sections along the length direction.

[0013] Optionally, each wing blade segment includes a blade body segment and a bonding segment extending from the blade body segment toward another wing blade segment, the bonding segments of two adjacent wing blade segments are stacked together and bonded to each other, the thickness of the bonding segment is less than the thickness of the blade body segment, and each wing blade segment also includes a blade seat segment, and the ends of two adjacent blade seat segments are stacked and pressed together.

[0014] According to another embodiment of the utility model, a fan blade assembly is provided, which includes: a fan blade having a suction surface and a pressure surface; and at least one wing blade device as described above, wherein a blade seat of the at least one wing blade device is installed on the suction surface of the fan blade.

[0015] Optionally, the axial direction of the wing blade device is parallel to the axial direction of the fan blade, the length direction of the wing blade device is arranged along the chord direction of the fan blade, the trailing edge installation position of the wing blade device is flush with the trailing edge of the fan blade, and the leading edge installation position of the wing blade device is spaced apart from the leading edge of the fan blade.

[0016] Optionally, when the distance between the leading edge installation position of the blade device and the leading edge of the airfoil of the fan blade is L v The chord length of the fan blade at the installation position of the blade device is L chord When L v and L chord Satisfy 0≤Lv ≤0.1×L chord Optionally, when the length of the wing blade device is L fence When L fence and L chord Meet 0.9×L chord ≤L fence ≤0.95×L chord Optionally, when the height of one end of the blade device close to the leading edge of the fan blade is H L The height of the blade device at one end close to the trailing edge of the fan blade is H r When H L Meet 0.01×L chord ≤H L ≤0.02×L chord , H r Meet 0.1×L chord ≤H r ≤0.15×L chord .

[0017] Optionally, the at least one wing blade device is selected from a first wing blade device, a second wing blade device, a third wing blade device and a fourth wing blade device. blade When the distance between the first blade device and the blade root of the fan blade is d 1 Meet 0.15×L blade ≤d 1 ≤0.25×L blade , the distance d between the second blade device and the blade root of the fan blade 2 Meet 0.35×L blade ≤d 2 ≤0.45×L blade The distance d between the third blade device and the blade root of the fan blade is 3 Meet 0.5×L blade ≤d 3 ≤0.6×L blade The distance d between the fourth blade device and the blade root of the fan blade is 4 Meet 0.8×L blade ≤d 4 ≤0.9×L blade .

[0018] According to another embodiment of the present invention, a wind turbine generator set is provided. The wind turbine generator set includes the wind turbine blade assembly as described above.

[0019] The wing blade device according to the embodiment of the utility model can effectively improve the flow separation problem on the blade surface and the three-dimensional expansion problem of the airflow in the span direction from the blade root to the blade tip, thereby increasing the output of the blade, realizing the redistribution of lift, improving the utilization rate of the airflow, and improving the power generation efficiency of the wind turbine.

[0020] The blade device according to the embodiment of the utility model has the characteristics of simple structure, light weight, easy installation, etc., and is suitable for strengthening the blades of large wind turbine generator sets.

[0021] The blade device according to the embodiment of the utility model does not rely on external auxiliary force, has low cost and low maintenance difficulty, and can improve the operating safety of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other purposes, features and advantages of the present invention will become more apparent through the following detailed description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a boundary layer diagram schematically showing an airfoil section of a fan blade;

[0024] Figure 2 is a schematic diagram of the distribution of the blade blade device in the span direction of the fan blade according to an embodiment of the utility model;

[0025] Figure 3 is a perspective view of a wing knife device according to an embodiment of the utility model;

[0026] Figure 4 is a front view of a wing knife device according to an embodiment of the utility model;

[0027] Figure 5 is a top view of a wing knife device according to an embodiment of the utility model;

[0028] Figure 6 It is a schematic diagram of a wing knife device according to an embodiment of the utility model;

[0029] Figure 7 Schematic diagram of a first wing blade segment and a second wing blade segment of a wing blade device according to an embodiment of the utility model;

[0030] Figure 8 Schematic diagram of a second wing blade segment and a third wing blade segment of a wing blade device according to an embodiment of the utility model;

[0031] Fig. 9 Schematic diagram of a third wing blade segment and a fourth wing blade segment of a wing blade device according to an embodiment of the utility model;

[0032] Fig.10Schematic diagram of a fourth wing blade segment and a fifth wing blade segment of a wing blade device according to an embodiment of the utility model;

[0033] Fig.11 is a schematic diagram of a fifth wing blade segment and a sixth wing blade segment of a wing blade device according to an embodiment of the utility model;

[0034] Fig.12 It is an airfoil diagram of a state in which a wing blade device according to an embodiment of the utility model is installed on a fan blade;

[0035] Fig.13 yes Fig.12 A top view of

[0036] Fig.14 It is the limiting streamline diagram of the suction surface of the prototype fan blade;

[0037] Fig.15 It is the limiting streamline diagram of the suction surface of the fan blade after installing a wing blade device.

[0038] Explanation of the symbols in the drawings: 10-fan blade, 11-pressure surface, 12-suction surface, 20-boundary layer, 30-wing blade device, 30-1-first wing blade segment, 30-2-second wing blade segment, 30-3-third wing blade segment, 30-4-fourth wing blade segment, 30-5-fifth wing blade segment, 30-6-sixth wing blade segment, 30a-first wing blade device, 30b-second wing blade device, 30c-third wing blade device, 30d-fourth wing blade device, 31-blade seat, 31-1-first blade seat Segment, 31-2-second knife seat segment, 31-3-third knife seat segment, 31-4-fourth knife seat segment, 31-5-fifth knife seat segment, 31-6-sixth knife seat segment, 31a-first surface, 31b-second surface, 31c-front edge end, 31d-rear edge end, 32-knife body, 32-1-first knife body segment, 32-2-second knife body segment, 32-3-third knife body segment, 32-4-fourth knife body segment, 32-5-fifth knife body segment, 32-6-sixth knife body segment, 32a-bottom. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] As described in the background technology section, flow separation near the blade surface is one of the main causes of wind turbine stall. Figure 1 Schematic diagram of the boundary layer of the airfoil section of the fan blade is shown schematically. Figure 1 As shown, the fan blade 10 has a pressure surface 11 and a suction surface 12. The airflow separation on the suction surface 12 generates a boundary layer 20. The chord length of the airfoil section is L blade , the boundary layer length is L layer Flow separation near the suction surface 12 of the fan blade 10 will cause a sharp drop in the aerodynamic performance of the fan. The utility model can effectively prevent the radial flow from the blade root to the blade tip by installing a wing blade device on the suction surface of the fan blade, thereby realizing the redistribution of lift, reducing the size of the stall separation area on the blade, and improving the aerodynamic characteristics of the impeller.

[0042] Figure 2 FIG. 1 is a schematic diagram of the distribution of the blade blade device in the span direction of the fan blade according to an embodiment of the utility model. Figure 2 As shown, the length of the fan blade 10 is L blade N blade devices 30 a , 30 b , 30 c and 30 d are installed along the span direction of the wind turbine blade 10 . Figure 2 4, but the present invention is not limited thereto, and N may be at least one. The blade devices 30a, 30b, 30c, and 30d are distributed along the span direction of the fan blade 10, and may be installed on the skin of the fan blade 10, for example.

[0043] Below, we will refer to Figures 3 to 11 The blade device 30 for a wind turbine blade according to an embodiment of the present invention is described in detail. It should be understood that the blade device 30 may refer to any one of the blade devices 30a, 30b, 30c and 30d.

[0044] like Figure 3 and Figure 4 As shown, the blade device 30 for a fan blade according to an embodiment of the utility model may include: a blade seat 31, having a first surface 31a and a second surface 31b opposite to each other, the first surface 31a is a mounting surface for mounting the blade device 30 to the fan blade 10; a blade body 32, fixed to the second surface 31b of the blade seat 31, and extending from the second surface 31b in a direction away from the first surface 31a. According to an embodiment of the utility model, as Figure 4As shown, the blade body 32 has a first end and a second end opposite to each other in the length direction, and the first end has a first height H in a height direction perpendicular to the length direction. l , the second end has a second height H in the height direction r , the first height H l Less than the second height H r .

[0045] like Figure 1 As shown, since the height of the boundary layer 20 on the suction surface 12 of the fan blade 10 gradually increases from the leading edge to the trailing edge of the fan blade 10, when the first height H of the blade body 32 according to the embodiment of the utility model is l Less than the second height H r When the airflow is radially directed from the blade root to the blade tip, the radial flow can be effectively prevented, thereby achieving the redistribution of lift, reducing the size of the stall separation area on the fan blade 10, and improving the aerodynamic characteristics of the impeller.

[0046] According to the embodiment of the utility model, when the chord length of the fan blade 10 at the installation position of the blade device 30 is L chord When the first height H l Can meet 0.01×L chord ≤H l ≤0.02×L chord , the second height H r Can meet 0.1×L chord ≤H r ≤0.15×L chord , so as to effectively prevent the radial flow of air from the blade root to the blade tip.

[0047] According to the embodiments of the present utility model, Figure 4 As shown, preferably, in order to more effectively prevent radial crossflow of airflow from the blade root to the blade tip, corresponding to the shape of the boundary layer 20, along the length direction, from the first end to the second end, the height of the blade body 32 gradually increases.

[0048] According to an embodiment of the present invention, the length of the blade device 30 may be greater than the length L of the boundary layer 20 of the airfoil section at the installation position. layer The height of the blade device 30 can be greater than the thickness of the boundary layer 20 of the airfoil section at the installation position. Therefore, the radial crossflow of the airflow from the blade root to the blade tip can be effectively prevented.

[0049] As an example, when the length of the wing blade device 30 is L fence The chord length of the fan blade 10 at the installation position of the blade device 30 is L chord When L fence and L chord Meet 0.9×L chord≤L fence ≤0.95×L chord , so as to effectively prevent the radial flow of air from the blade root to the blade tip.

[0050] According to the embodiments of the present utility model, Figure 3 As shown, the first surface 31a and the second surface 31b of the blade holder 31 may be arc-shaped. The first surface 31a is the mounting surface of the blade device 30, that is, the blade device is mounted on the fan blade 10 through the first surface 31a. For example, the first surface 31a can be mounted on the suction surface 12 of the fan blade 10 by bonding, punching connection or bolt connection. The first surface 31a may have a profile that is substantially the same as the profile of the suction surface 12 of the fan blade 10 to avoid a seam between the first surface 31a and the suction surface 12 of the fan blade 10. The blade holder 31 may be mounted so that the length direction corresponds to the chord direction of the fan blade 10.

[0051] When the blade seat 31 is installed with its length direction corresponding to the chord direction of the fan blade 10 , the width direction (a direction perpendicular to the length direction and the height direction) of the blade device 30 may correspond to the span direction of the fan blade 10 .

[0052] According to the embodiments of the present utility model, Figure 5 As shown, the blade holder 31 has a leading edge end 31c and a trailing edge end 31d opposite to each other in the length direction, and the dimension of the leading edge end 31c in the width direction is smaller than the dimension of the trailing edge end 31d in the width direction to save materials and reduce weight. The leading edge end 31c is close to the leading edge of the fan blade 10, and the trailing edge end 31d is close to the trailing edge of the fan blade 10.

[0053] As an example, the dimension W of the front edge end 31c in the width direction is l Meet 40mm≤W l ≤60mm, the width dimension W of the rear edge 31d r Meet 80mm≤W r ≤100 mm. As an example, along the length direction, from the front edge end 31 c to the rear edge end 31 d, the size of the blade seat 31 in the width direction gradually increases.

[0054] As an example, the thickness T of the seat 31 is h Meet 3mm≤T h ≤8mm. The entire thickness of the knife seat 31 may be uniform, but the present invention is not limited thereto. As an example, both ends of the knife seat 31 in the width direction adopt a chamfered structure, and the chamfer width W h Meet 5mm≤W h ≤16mm.

[0055] According to an embodiment of the present invention, the blade body 32 is arranged at the center of the blade seat 31 in the width direction and is perpendicular to the blade seat 31. As an example, a circular arc segment transition may be adopted between the blade body 32 and the blade seat 31.

[0056] According to an embodiment of the present invention, the blade body 32 has a bottom 32a fixed to the second surface 31b and a top 32b opposite to the bottom 32a in the height direction, and the size of the top 32b in the width direction is smaller than the size of the bottom 32a in the width direction to save materials and reduce weight. Figure 3 As shown, the blade body 32 is a thin vertical plate, the cross section of the vertical plate is wide at the bottom and narrow at the top, and the cross section is generally a trapezoidal quadrilateral structure, but the utility model is not limited thereto. For example, the cross section of the blade body 32 is in other shapes such as stepped or wavy.

[0057] According to an embodiment of the present invention, the dimension T of the bottom 32a in the width direction is b Meet 5mm≤T b ≤8mm, the width dimension T of the top 32b t Meet 2mm≤T t ≤5mm. In addition, if Figure 3 As shown, along the length direction, from the bottom 32a to the top 32b, the size of the blade body 32 in the width direction gradually decreases to facilitate a uniform transition.

[0058] like Figure 6 As shown, in order to facilitate transportation and processing and to conform to the shape of the suction surface 12 of the wind turbine blade 10, according to an embodiment of the present invention, the blade device 30 can be divided into at least two blade sections along the length direction. Figure 6 A total of six flap segments are shown in FIG. 1 , namely, a first flap segment 30 - 1 , a second flap segment 30 - 2 , a third flap segment 30 - 3 , a fourth flap segment 30 - 4 , a fifth flap segment 30 - 5 and a sixth flap segment 30 - 6 .

[0059] According to an embodiment of the utility model, each wing blade segment includes a blade body segment and a bonding segment extending from the blade body segment toward another wing blade segment (similar to a fan-shaped segment fanning outward), and the bonding segments of two adjacent wing blade segments are stacked together and bonded to each other. By bonding the bonding segments of two adjacent wing blade segments, a gap can be avoided on the joint surface. As an example, the thickness of the bonding segment is less than the thickness of the blade body segment. In addition, as an example, the thickness of the two bonding segments after bonding can be substantially equal to the thickness of the blade body segment.

[0060] According to an embodiment of the utility model, each wing blade segment further includes a blade seat segment, and the ends of two adjacent blade seat segments are overlapped and pressed together.

[0061] Specifically, Figure 7As shown, the first wing segment 30-1 may include a first blade seat segment 31-1 and a first blade body segment 32-1, and the second wing segment 30-2 may include a second blade seat segment 31-2 and a second blade body segment 32-2. The ends of the first blade seat segment 31-1 and the second blade seat segment 31-2 may be overlapped and pressed together. In addition, the first wing segment 30-1 may include a bonding segment extending from the first blade seat segment 31-1 toward the second wing segment 30-2, and the second wing segment 30-2 may include a bonding segment extending from the second blade seat segment 31-2 toward the first wing segment 30-1, and the bonding segment of the first wing segment 30-1 and the bonding segment of the second wing segment 30-2 are overlapped and bonded to each other.

[0062] Similarly, if Figure 8 As shown, the third blade segment 30-3 may include a third blade seat segment 31-3 and a third blade body segment 32-3, and the ends of the second blade seat segment 31-2 and the third blade seat segment 31-3 may be overlapped and pressed together. The bonding segment extending from the third blade body segment 32-3 toward the second blade body segment 32-2 may overlap and bond with the bonding segment extending from the second blade body segment 32-2 toward the third blade body segment 32-3.

[0063] Similarly, if Fig. 9 As shown, the fourth blade wing segment 30-4 may include a fourth blade seat segment 31-4 and a fourth blade body segment 32-4, and the ends of the third blade seat segment 31-3 and the fourth blade seat segment 31-4 may be overlapped and pressed together. The bonding segment extending from the fourth blade body segment 32-4 toward the third blade body segment 32-3 may overlap and bond with the bonding segment extending from the third blade body segment 32-3 toward the fourth blade body segment 32-4.

[0064] Similarly, if Fig.10 As shown, the fifth blade segment 30-5 may include a fifth blade seat segment 31-5 and a fifth blade body segment 32-5, and the ends of the fourth blade seat segment 31-4 and the fifth blade seat segment 31-5 may be overlapped and pressed together. The bonding segment extending from the fifth blade body segment 32-5 toward the fourth blade body segment 32-4 may overlap and bond with the bonding segment extending from the fourth blade body segment 32-4 toward the fifth blade body segment 32-5.

[0065] Similarly, if Fig.11 As shown, the sixth blade wing segment 30-6 may include a sixth blade seat segment 31-6 and a sixth blade body segment 32-6, and the ends of the fifth blade seat segment 31-5 and the sixth blade seat segment 31-6 may be overlapped and pressed together. The bonding segment extending from the sixth blade body segment 32-6 toward the fifth blade body segment 32-5 may overlap and bond with the bonding segment extending from the fifth blade body segment 32-5 toward the sixth blade body segment 32-6.

[0066] Although the above description describes that the wing blade device 30 is divided into six wing blade segments, the utility model is not limited thereto, and the wing blade device 30 can be divided into at least two wing blade segments along the length direction (corresponding to the chord direction of the fan blade 10). In addition, the wing blade device 30 may not be segmented. For example, the entire wing blade device 30 may be an integral part, or optionally, the blade seat 31 is an integral part, the blade body 32 is an integral part, and the blade seat 31 and the blade body 32 are fixed together.

[0067] The following, combined Figure 2 , Fig.12 and Fig.13 A fan blade assembly according to an embodiment of the present invention is described.

[0068] According to an embodiment of the utility model, a fan blade assembly can also be provided, such as Fig.12 and Fig.13 As shown, the fan blade assembly includes a fan blade 10 and at least one blade device 30. The fan blade 10 may have a pressure surface 11 and a suction surface 12, and a blade seat 31 of at least one blade device 30 may be mounted on the suction surface 12 of the fan blade 10.

[0069] According to the embodiments of the present utility model, Fig.12 As shown, the axial direction of the flap device 30 is parallel to the axial direction of the fan blade 10, the length direction of the flap device 30 is arranged along the chord direction of the fan blade 10, the trailing edge installation position of the flap device 30 is flush with the trailing edge of the fan blade 10, and the leading edge installation position of the flap device 30 is spaced apart from the leading edge of the fan blade 10.

[0070] like Fig.13 As shown, when the distance between the leading edge installation position of the blade device 30 and the leading edge of the airfoil of the fan blade 10 is L v The chord length of the fan blade 10 at the installation position of the blade device 30 is L chord When L v and L chord Satisfy 0≤L v ≤0.1×L chord , optionally, satisfying 0.05×L chord ≤L v ≤0.1×L chord The distance L between the leading edge installation position of the blade device 30 and the leading edge of the airfoil of the fan blade 10 is v Greater than 0.1×L chord , the boundary layer 20 may not be completely covered.

[0071] In addition, return to reference Figure 2 When the fan blade assembly includes four wing blade devices, the distance d between the first wing blade device 30a and the blade root of the fan blade 10 is 1Meet 0.15×L blade ≤d 1 ≤0.25×L blade The distance d between the second blade device 30b and the blade root of the fan blade 10 is 2 Meet 0.35×L blade ≤d 2 ≤0.45×L blade The distance d between the third blade device 30c and the blade root of the fan blade 10 is 3 Meet 0.5×L blade ≤d 3 ≤0.6×L blade The distance d between the fourth blade device 30d and the blade root of the fan blade 10 is 4 Meet 0.8×L blade ≤d 4 ≤0.9×L blade , so as to effectively prevent the radial flow of air from the blade root to the blade tip at the airflow separation areas at the blade root, blade middle and blade tip.

[0072] Although it is described above that the fan blade assembly includes four wing devices, the present invention is not limited thereto. The fan blade assembly according to an embodiment of the present invention may include at least one of the first to fourth wing devices 30a to 30d.

[0073] The other features of the wing knife device are the same as those described above and will not be described repeatedly here.

[0074] According to another embodiment of the utility model, a wind turbine generator set including the wind turbine blade assembly as described above can also be provided.

[0075] Fig.14 is the limiting streamline diagram of the suction surface of the prototype fan blade. Specifically, Fig.14 The airflow separation flow along the blade span of a 90m long fan blade under a wind speed range of 13-15m / s. Fig.14 This is the limiting streamline diagram of the suction surface of the fan blade.

[0076] Fig.15 is Fig.14 The suction surface limit streamline diagram after the first blade device 30a is installed on the basis of the fan blade. Fig.14 and Fig.15 It can be found that the first wing blade device 30a can directly prevent the separation flow along the blade span direction from a physical level. In addition, not only the separation flow along the blade span direction on the right side of the first wing blade device 30a is reduced, but also the separation flow along the blade chord length is suppressed.

[0077] The wing knife device according to the utility model can achieve beneficial technical effects not limited to the following description.

[0078] According to the wing blade device of the utility model, the flow separation problem on the blade surface and the three-dimensional expansion problem of the airflow in the span direction from the blade root to the blade tip can be effectively improved, the output of the blade can be increased, the lift can be redistributed, the airflow utilization rate can be improved, and the power generation efficiency of the wind turbine can be improved.

[0079] The blade device according to the embodiment of the utility model has the characteristics of simple structure, light weight, easy installation, etc., and is suitable for strengthening the blades of large wind turbines. The entire blade device can improve the out-of-plane stiffness of the wind turbine blades, play the effect of reducing vibration and reducing the aerodynamic load of the blades, and realize the redistribution of the load borne by the blades.

[0080] In addition, the blade device according to the embodiment of the utility model does not rely on external auxiliary force, has low cost and low maintenance difficulty, and can improve the operating safety of the wind turbine generator set.

[0081] Although the exemplary embodiments of the present invention have been described in detail with reference to exemplary embodiments thereof, those skilled in the art will understand that various changes in form and details may be made thereto without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A blade device for a fan blade, characterized in that: The wing knife device (30) comprises: A blade seat (31) having a first surface (31a) and a second surface (31b) opposite to each other, wherein the first surface (31a) is a mounting surface for mounting the blade device (30) on the fan blade (10); a blade body (32) fixed to the second surface (31b) of the blade seat (31) and extending from the second surface (31b) in a direction away from the first surface (31a), The blade body (32) has a first end and a second end opposite to each other in the length direction, the first end has a first height in a height direction perpendicular to the length direction, and the second end has a second height H in the height direction. r , the first height H l is smaller than the second height.

2. The wing blade device according to claim 1, characterized in that: Along the length direction, from the first end to the second end, the height of the blade body (32) in the height direction gradually increases.

3. The wing blade device according to claim 1, characterized in that: The knife body (32) is arranged at the center of the knife seat (31) in the width direction and is perpendicular to the knife seat (31), and the width direction is perpendicular to the length direction and the height direction.

4. The wing blade device according to claim 1, characterized in that: The blade body (32) has a bottom (32a) fixed to the second surface (31b) and a top (32b) opposite to the bottom (32a) in the height direction, the top (32b) having a smaller dimension in the width direction than the bottom (32a) in the width direction, and the width direction is perpendicular to the length direction and the height direction.

5. The wing blade device according to claim 1, characterized in that: The knife seat (31) has a front edge end (31c) and a rear edge end (31d) opposite to each other in the length direction, the dimension of the front edge end (31c) in the width direction is smaller than the dimension of the rear edge end (31d) in the width direction, and the width direction is perpendicular to the length direction and the height direction.

6. The wing blade device according to any one of claims 1 to 5, characterized in that: The wing blade device (30) is divided into at least two wing blade sections along the length direction.

7. The wing blade device according to claim 6, characterized in that: Each wing blade segment includes a blade body segment and a bonding segment extending from the blade body segment toward another wing blade segment, the bonding segments of two adjacent wing blade segments are stacked together and bonded to each other, and the thickness of the bonding segment is less than the thickness of the blade body segment. Each wing blade segment also includes a blade seat segment, and the ends of two adjacent blade seat segments are overlapped and pressed together.

8. A fan blade assembly, characterized in that: The fan blade assembly comprises: A fan blade (10) having a suction surface and a pressure surface; According to at least one blade device (30) according to any one of claims 1 to 7, a blade seat (31) of the at least one blade device (30) is mounted on the suction surface (12) of the fan blade (10).

9. The fan blade assembly according to claim 8, characterized in that: The axial direction of the wing blade device (30) is parallel to the axial direction of the fan blade (10), the length direction of the wing blade device (30) is arranged along the chord direction of the fan blade (10), the trailing edge installation position of the wing blade device (30) is flush with the trailing edge of the fan blade (10), and the leading edge installation position of the wing blade device (30) is spaced apart from the leading edge of the fan blade (10).

10. The fan blade assembly according to claim 9, characterized in that: When the distance between the leading edge installation position of the blade device (30) and the leading edge of the airfoil of the fan blade (10) is L v The chord length of the fan blade (10) at the installation position of the blade device (30) is L chord When L v and L chord Satisfy 0≤L v ≤0.1×L chord , When the length of the wing blade device (30) is L fence When L fence and L chord Meet 0.9×L chord ≤L fence ≤0.95×L chord , When the height of one end of the wing blade device (30) close to the leading edge of the fan blade (10) is H L The height of the blade device (30) at one end close to the trailing edge of the fan blade (10) is H r When H L Meet 0.01×L chord ≤H L ≤0.02×L chord , H r Meet 0.1×L chord ≤H r ≤0.15×L chord .

11. The fan blade assembly according to claim 9, characterized in that: The at least one wing knife device (30) is selected from a first wing knife device (30a), a second wing knife device (30b), a third wing knife device (30c) and a fourth wing knife device (30d), When the length of the fan blade (10) is L blade When the distance d1 between the first blade device (30a) and the blade root of the fan blade (10) satisfies 0.15×L blade ≤d1≤0.25×L blade The distance d2 between the second blade device (30b) and the blade root of the fan blade (10) satisfies 0.35×L blade ≤d2≤0.45×L blade The distance d3 between the third blade device (30c) and the blade root of the fan blade (10) satisfies 0.5×L blade ≤d3≤0.6×L blade The distance d4 between the fourth blade device (30d) and the blade root of the fan blade (10) satisfies 0.8×L blade ≤d4≤0.9×L blade .

12. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a wind turbine blade assembly according to any one of claims 8 to 11.

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