CN111379660A - Wind power blade and fan - Google Patents

Wind power blade and fan Download PDF

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Publication number
CN111379660A
CN111379660A CN201811638031.4A CN201811638031A CN111379660A CN 111379660 A CN111379660 A CN 111379660A CN 201811638031 A CN201811638031 A CN 201811638031A CN 111379660 A CN111379660 A CN 111379660A
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CN
China
Prior art keywords
blade
suction surface
flexible
wind
flexible extension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811638031.4A
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Chinese (zh)
Inventor
李成良
郝赫为
李磊
周捍珑
方致阳
乔玉军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinomatech Wind Power Blade Co Ltd
Original Assignee
Sinomatech Wind Power Blade Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinomatech Wind Power Blade Co Ltd filed Critical Sinomatech Wind Power Blade Co Ltd
Priority to CN201811638031.4A priority Critical patent/CN111379660A/en
Publication of CN111379660A publication Critical patent/CN111379660A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a wind power blade and a fan. The blade body includes a suction side and a pressure side. The flexible extension part comprises a first end part and a second end part, the first end part is provided with a bending part, the bending part is connected to the suction surface, the second end part freely extends to the rear edge of the blade body, and the flexible extension part can generate passive deformation so as to change the flow track of the airflow along the suction surface.

Description

Wind power blade and fan
Technical Field
The invention relates to the field of wind power generation in general, and particularly relates to a wind power blade and a fan provided with the wind power blade.
Background
When the variable-pitch wind wheel blade operates, because the rotating speed of the blade root relative to the blade tip position in a rotating plane is lower, when the wind speed is the same, the section incidence angle near the maximum chord length is larger than the incidence angle at the blade tip position. With the increase of the wind speed, when the wind speed does not reach the rated wind speed, the incidence angle of the section near the maximum chord length is gradually increased, when the incidence angle reaches a higher value at the rated wind speed, the blade generates the maximum output power at the moment. With the increase of the wind speed, the blades perform a pitching action in order to maintain the rated power. When the wind speed is higher than the rated wind speed, the section attack angle near the maximum chord length is gradually increased along with the increase of the wind speed until the wind speed reaches the cut-out wind speed. Before the wind speed reaches the rated wind speed and in a part of wind speed section before the wind speed reaches the cut-out wind speed, the phenomenon of overlarge attack angles in different degrees appears near the maximum chord length, and the overlarge attack angles cause the separation of air flows, so that the generated energy is reduced.
In order to solve the above problems, it is often adopted in the prior art to add a deformable device on the trailing edge side of the suction surface of the blade, and the airfoil profile on the trailing edge side is changed by passive deformation of the deformable device, so as to change the airflow flow on the entire trailing edge side. However, most of deformable devices in the prior art are directly connected to the suction surface through adhesive, and the deformable devices often fall off from the suction surface in the long-time deformation motion process, so that the maintenance cost is increased, and the overall power generation amount is influenced.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned disadvantages of the prior art, and providing a wind turbine blade, which solves the problem of the prior art that the flexible bending portion is not firmly connected.
Another main object of the present invention is to overcome at least one of the above drawbacks of the prior art and to provide a wind turbine equipped with the above wind turbine blade.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to one aspect of the invention, a wind turbine blade is provided, comprising a blade body and a flexible extension. The blade body comprises a suction surface and a pressure surface; the flexible extension part comprises a first end part and a second end part, the first end part is provided with a bending part, the bending part is connected to the suction surface, the second end part freely extends to the rear edge of the blade body, and the flexible extension part can generate passive deformation so as to change the flow path of the airflow along the suction surface.
According to an embodiment of the present invention, the flexible extending portion includes an extending portion body and the bending portion, the bending portion is disposed at an end of the extending portion body facing the front edge of the blade body, and the bending portion includes a folded edge extending toward the rear edge of the blade body, and the folded edge is connected to the suction surface.
According to an embodiment of the present invention, a side of the bent portion facing the front edge of the blade body forms a slope.
According to an embodiment of the present invention, the bent portion includes a connecting portion, one end of the connecting portion starts from an end surface of the folded edge facing the front edge and extends toward the front edge along the suction surface, a side of the connecting portion facing the front edge of the blade body forms an inclined surface, and the connecting portion is connected to the suction surface.
According to an embodiment of the present invention, the flexible extending portion includes an extending portion body and the bending portion, the bending portion is disposed at an end of the extending portion body facing the front edge of the blade body, the suction surface is provided with an opening, and the bending portion is embedded in the opening.
According to an embodiment of the invention, the wind power blade further includes a limiting member, and the limiting member is disposed at one end of the bent portion extending into the suction surface and is accommodated in the blade body.
According to an embodiment of the invention, the flexible extension is plate-shaped.
According to an embodiment of the present invention, the bending portion is connected to a predetermined region of the suction surface, and the predetermined region is 40% to 95% of a chord length from a front edge of the blade body.
According to an embodiment of the invention, the wind turbine blade further comprises a stiffener, the stiffener comprising:
one end of the first reinforcing part is connected to one side, away from the suction surface, of the flexible extending part, and the other end of the first reinforcing part is connected to the suction surface;
and/or the presence of a gas in the gas,
one end of the second reinforcing member is connected to one side of the flexible extending portion, which faces the suction surface, and the other end of the second reinforcing member is connected to the suction surface.
According to an embodiment of the invention, the flexible extension is provided with a drainage structure.
According to an embodiment of the invention, the drainage structure comprises:
the drainage tube is connected to the flexible extending part, one end of the drainage tube is exposed out of the side wall of the flexible extending part, which is far away from the suction surface, and the other end of the drainage tube is exposed out of the side wall of the flexible extending part, which is far towards the suction surface;
and/or the presence of a gas in the gas,
a groove disposed on a surface of the flexible extension portion facing away from the suction surface, the groove extending from the first end to the second end of the flexible extension portion.
According to an embodiment of the invention, the flexible extension has a stiffening rib extending from the first end to the second end.
According to an embodiment of the invention, an end surface of the second end of the flexible extension exceeds a trailing edge of the blade body.
According to an embodiment of the invention, a chord wise length of a portion of the flexible extension beyond the trailing edge of the blade body is less than or equal to 20% of a chord length of the blade body.
According to an embodiment of the invention, the portion of the flexible extension that exceeds the trailing edge of the blade body has a bend.
According to an embodiment of the invention, the flexible extension part is a plurality of flexible extension parts, the flexible extension parts are arranged along the axial direction of the blade body, and the distance between two opposite end surfaces of two adjacent flexible extension parts is 0-200 mm.
According to another aspect of the invention, there is provided a wind turbine comprising a wind turbine blade as defined in any one of the above.
According to the technical scheme, the wind power blade has the advantages and positive effects that:
compared with the structure that one end of the flexible extending part is directly connected to the suction surface, the flexible extending part provided by the invention is indirectly connected to the suction surface through the bending part, so that the force acting on the flexible extending part is firstly transmitted to the bending part instead of directly acting on the connection part of the flexible extending part and the bending part, the separation of the flexible extending part and the suction surface caused by the force is effectively avoided, the probability that the flexible extending part falls off from the blade body is greatly reduced, and the maintenance cost is reduced.
In addition, one side of the bent part facing the front edge of the blade body is designed into an inclined plane, so that when airflow flows from the front edge to the rear edge along the suction surface, the airflow can smoothly pass through the inclined plane, and the phenomenon that the airflow changes suddenly at the position to influence the deformation of the flexible extension part is avoided.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic view of a first embodiment of a wind blade shown according to an exemplary embodiment.
FIG. 2 is a schematic view of a second embodiment of a wind blade shown according to an exemplary embodiment.
FIG. 3 is a schematic view of a third embodiment of a wind blade shown in accordance with an exemplary embodiment.
FIG. 4 is a schematic illustration of a wind blade provided with a first stiffener, according to an exemplary embodiment.
FIG. 5 is a schematic view illustrating a wind blade provided with a second stiffener according to an exemplary embodiment.
FIG. 6 is a schematic view illustrating a flexible extension having a drainage structure according to an exemplary embodiment.
FIG. 7 is a schematic view illustrating a flexible extension having reinforcing ribs according to an exemplary embodiment.
FIG. 8 is a schematic view illustrating the flexible extension extending beyond the trailing edge of the blade body according to an exemplary embodiment.
FIG. 9 is a schematic view of a first embodiment showing a flexible extension having a bend in a portion beyond a trailing edge of a blade body according to an exemplary embodiment.
FIG. 10 is a schematic view of a second embodiment showing a flexible extension having a bend in a portion beyond the trailing edge of the blade body in accordance with an exemplary embodiment.
FIG. 11 is a schematic view of a third embodiment showing a flexible extension having a bend in a portion beyond the trailing edge of the blade body in accordance with an exemplary embodiment.
FIG. 12 is a schematic view illustrating a wind blade provided with a plurality of flexible extensions according to an exemplary embodiment.
FIG. 13 is a schematic view of a wind turbine shown according to an exemplary embodiment.
Wherein the reference numerals are as follows:
1. a blade body; 11. a suction surface; 12. a pressure surface; 13. a leading edge; 14. a trailing edge; 15. a blade root; 16. a blade tip; 17. an opening;
2. a flexible extension; 21. a first end portion; 22. a second end portion; 24. an extension body; 25. a bending section; 251. folding edges; 252. a connecting portion; 26. a drainage tube; 27. a groove; 28. reinforcing ribs;
41. a first reinforcement; 42. a second reinforcement; 5. a limiting member; 100. a fan;
D. a chord direction; n, axial direction.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "top", "bottom", and the like, are also intended to have similar meanings. The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," "third," and "fourth," etc. are used merely as labels, and are not limiting as to the number of their objects.
In the following, some embodiments of the invention will be described in detail with reference to the accompanying drawings, and features in the embodiments described below can be combined with each other without conflict.
For the sake of convenience of the following description, the extending direction of the blade root and the blade tip is defined as the axial direction, the extending direction of the leading edge and the trailing edge is defined as the chord direction, the straight distance between the leading edge and the trailing edge is defined as the chord length, and the straight distance having the longest length of the chord length is the maximum chord length.
First embodiment
The invention provides a wind power blade which comprises a blade body 1 and a flexible extension part 2. The blade body 1 comprises a suction side 11 and a pressure side 12, a leading edge 13 and a trailing edge 14. The flexible extension 2 comprises a first end 21 and a second end 22, the first end 21 having a bend 25, the bend 25 being connected to the suction surface 11, the second end 22 being free to extend towards the trailing edge 14 of the blade body 1.
When the wind power blade works, the flexible extension part 2 can generate passive deformation, and then the rear edge side wing profile of the wind power blade is changed. The term "passive deformation" refers to the flexible extension 2 swinging toward or away from the suction surface 11 about its connection with the suction surface 11 under the influence or action of some external force. Additionally, it should be understood that the external force may be generated aerodynamically, by gravity, and/or by centrifugal forces (elastic forces, inertial forces, etc.). Specifically, when the wind speed reaches the rated wind speed and reaches a part of the wind speed section before the cut-out wind speed, the attack angle of the blade is too large, and the flexible extension part 2 is passively deformed.
Specifically, as shown in fig. 1, in the present embodiment, the flexible extension 2 includes an extension body 24 and a bent portion 25, the bent portion 25 is disposed at one end of the extension body 24 facing the front edge of the blade body 1, the bent portion 25 includes a folded edge 251 extending toward the rear edge of the blade body 1, the folded edge 251 is connected to the suction surface, and the folded edge 251 is disposed between the extension body 24 and the suction surface 11. In some embodiments, the edge 251 may be secured to the suction surface 11 by adhesive, may be attached by rivets, nuts and bolts, screws, etc., or other attachment means known in the art, although combinations of the above attachment means, such as adhesive and rivets, may also be used.
When the flexible extension 2 is deformed, the flexible extension 2 moves away from the suction surface 11, and if the first end 21 of the flexible extension 2 is directly connected to the suction surface 11, the connection between the flexible extension 2 and the suction surface 11 and the part close to the trailing edge 14 are separated due to the instability of the airflow, which affects the airfoil profile on the trailing edge side of the blade. Furthermore, the flexible extension part 2 will fall off from the suction surface 11 when the wind power blade moves for a long time.
In the present embodiment, when the extension body is deformed, the force applied to the extension body is directed in a direction away from the suction surface 11, and since the extension body is connected to the suction surface 11 via the folded edge 251, the direction in which the force acts on the folded edge 251 is directed toward the suction surface 11, and therefore, when the extension body is indirectly connected to the suction surface 11 via the folded edge 251, the force acting on the folded edge 251 is not directed away from the suction surface 11, and the folded edge 251 is not detached from the suction surface 11.
Further, with reference to fig. 1, in the present embodiment, the bending portion 25 includes a connecting portion 252, one end of the connecting portion 252 starts from a portion of the extending portion body close to the front edge 13 of the blade body 1, and the other end of the connecting portion 252 extends toward the front edge 13 and the inner direction of the blade body 1 and is connected to the folded edge 251. Accordingly, the connecting portion 252 forms a slope on the side facing the front edge 13 of the blade, so that when the airflow flows from the front edge 13 to the rear edge 14 along the suction surface 11, the airflow can smoothly pass through the slope, and the airflow is prevented from generating sudden changes at the slope to affect the deformation of the flexible extending portion 2.
In some embodiments, the angle between the slope formed by the connection portion 252 and the suction surface 11 may be 10 degrees to 45 degrees.
Further, in the present embodiment, the flexible extension 2 may be in a plate shape, and may be optionally reinforced with a fiber material, for example, the fiber material may include glass fiber, carbon fiber, polymer fiber, ceramic fiber, nano fiber, wood fiber, bamboo fiber, metal fiber, or the like, and combinations thereof.
Additionally, the orientation of the fibers may include multiaxial, uniaxial, biaxial, triaxial, or any other suitable orientation and/or combination thereof. Furthermore, the fiber content may vary depending on various desired properties of the flexible extension 2, such as its stiffness and/or weldability.
Further, in the present embodiment, the bent portion 25 is connected to a predetermined region of the suction surface 11, the predetermined region being 40% to 95%, preferably 40% to 70%, of a chord length from the front edge 13 of the blade body 1.
Specifically, the preset region may be provided near the maximum chord length position of the blade body 1, and preferably may be divided into two sections, i.e., a left section extending from the maximum chord length position toward the blade tip 16 and a right section extending from the maximum chord length position toward the blade root 15. The preset region is provided on the trailing edge side of the suction surface 11, and in the direction extending from the leading edge 13 to the trailing edge 14, the preset region starts at a position of 40% of the chord length and ends at a position of 95% of the chord length, and preferably, the preset region may be provided at a position of 40% of the chord length. The flexible extension part 2 is arranged in the preset area, so that the material cost of the flexible extension part 2 is saved, and the generation of passive deformation is ensured.
Further, the bonding width of the adhesive layer 3 in the chord direction D may be 50mm to 200mm, preferably 100 mm.
The connection process of the flexible extension 2 is explained in detail by taking 40% of the chord length and 100mm of the bonding width as an example: when the predetermined area is selected to be 40% of the chord length, the end surface of the first end portion 21 of the flexible extension 2 is aligned with the position of 40% of the chord length, and the distance of 100mm is measured from the chord direction D to the rear edge 14, which is the position where the first end portion 21 of the flexible extension 2 is bonded. Still further, the width of the flexible extension 2 in the axial direction N of the blade body 1 may be 0.5m-5m, such as 1m, 2m, 4m, etc.
Further, as shown in fig. 4, in the present embodiment, the wind turbine blade further includes a first reinforcing member 41, one end of the first reinforcing member 41 is connected to one side of the flexible extending portion 2 away from the suction surface 11, and the other end of the first reinforcing member 41 is connected to the suction surface 11 of the wind turbine blade.
Further, as shown in fig. 5, in the present embodiment, the wind power blade further includes a second reinforcing member 42, one end of the second reinforcing member 42 is connected to the side of the flexible extending portion 2 facing the suction surface 11, and the other end of the second reinforcing member 42 is connected to the suction surface 11 of the wind power blade.
In other embodiments, both the first reinforcement 41 and the second reinforcement 42 may be employed.
It should be understood by those skilled in the art that the first reinforcing member 41 and the second reinforcing member 42 may be made of cloth, the first reinforcing member 41 and the second reinforcing member 42 may be connected by adhesive, by rivets, nuts and bolts, screws, etc., or by other connecting means known in the art, and of course, a combination of the above connecting means, such as adhesive and rivets, may also be used.
Further, as shown in fig. 6, in the present embodiment, the flexible extension 2 is provided with a flow guiding structure for guiding the air flow from the suction side 11 to the pressure side 12 of the blade body 1.
Specifically, the drainage structure may include a drainage tube 26, the drainage tube 26 is connected to the flexible extension portion 2, one end of the drainage tube 26 is exposed to a side of the flexible extension portion 2 away from the suction surface 11, and the other end of the drainage tube 26 is exposed to a side of the flexible extension portion 2 facing the suction surface 11. The draft tube 26 can rapidly divert the flow of air on the suction side 11 to the pressure side 12.
In other embodiments, the drainage structure may comprise a groove 27 provided at a side surface of the flexible extension 2 facing away from the suction surface 11, the groove 27 extending from the first end 21 to the second end 22 of the flexible extension 2. The grooves 27 can rapidly channel the air flow at the leading edge 13 of the blade to the trailing edge 14 and thus to the side of the pressure surface 12.
Of course, in other embodiments, the flexible extension 2 may include both the drain 26 and the groove 27.
Further, as shown in fig. 7, in the present embodiment, the flexible extension portion 2 has a reinforcing rib 28, and the reinforcing rib 28 extends from the first end portion 21 to the second end portion 22 of the flexible extension portion 2. In the present invention, the number of the reinforcing ribs 28 may be one, two or more, the cross-sectional shape of the reinforcing ribs 28 may be triangular, rectangular or other shapes, and the reinforcing ribs 28 may be disposed on a side surface of the flexible extension portion 2 facing away from the suction surface 11, on a side surface of the flexible extension portion 2 facing toward the suction surface 11, or on both side surfaces.
Further, as shown in fig. 8, in the present embodiment, the end surface of the second end 22 of the flexible extension portion 2 exceeds the rear edge 14 of the wind power blade, and such design can effectively increase the labor saving of the wind power blade and simultaneously weaken the separation of the airflow.
Further, the chord direction D length of the excess portion is less than or equal to 20% of the chord length of the blade body 1.
Further, in the present embodiment, the portion of the second end 22 of the flexible extension 2 beyond the trailing edge 14 of the wind turbine blade has a bend, and the bend may be toward the suction surface 11 or away from the suction surface 11. As shown in fig. 9 and 10, the bent portion 25 may be bent in a zigzag form, and as shown in fig. 11, the bent portion 25 may be bent in an arc form. The flexible extension 2 extends towards the rear edge 14 at an angle of 0 degrees, and the bending angle may be-30 to 30 degrees. When the bending part is bent upwards, the negative pressure formed at this time is larger, so that the flexible extension part 2 is subjected to a larger force in a direction away from the pressure surface 12, and is more easily deformed.
Further, as shown in fig. 12, in the present embodiment, the number of the flexible extensions 2 is plural, the plural flexible extensions 2 are arranged along the axial direction N of the blade body 1, and the distance between the two opposite end surfaces of two adjacent flexible extensions 2 is 0 to 200 mm.
The plurality of flexible extensions 2 may be arranged in the entire axial direction N of the blade body 1, i.e. from the blade root 15 to the blade tip 16. Preferably, the plurality of flexible extensions 2 may be sequentially arranged in the direction of the blade root 15 and the blade tip 16, respectively, with the maximum chord length of the blade body 1 as a central axis.
Second embodiment
The second embodiment is a schematic modification of the first embodiment, and the same technical features as those of the first embodiment will not be described in detail, but the difference is that:
as shown in fig. 2, the bent portion 25 includes a connecting portion 252, one end of the connecting portion 252 starts from an end surface of the folded edge 251 facing the front edge 13 and extends toward the front edge 13 along the suction surface 11, one side of the connecting portion 252 facing the front edge 13 of the blade body 1 forms an inclined surface, and the connecting portion 252 is connected to the suction surface 11. In other words, the cross-sectional shape of the bending portion 25 along the chord direction D may be substantially triangular, and one end of the extension body near the front edge 13 is integrally formed at the top of the triangle. Accordingly, the connecting portion 252 and the folded edge 251 are connected to the suction surface 11 at the same time, so that the connecting area between the connecting portion 252 and the folded edge 251 is increased, the connecting firmness is ensured, and the passive deformation of the extension portion body cannot be influenced due to the increase of the connecting area.
Third embodiment
As shown in fig. 3, in the present embodiment, the flexible extension portion 2 includes an extension portion main body 24 and a bent portion 25, the bent portion 25 is provided at one end of the extension portion main body 24 facing the front edge 13 of the blade main body 1, the suction surface 11 has an opening 17, and the bent portion 25 can be fitted into the opening 17.
It should be understood that one end of the bent portion 25 may be connected to the extending portion body 24, and the other end of the bent portion 25 extends toward the suction surface, and the extending direction may be perpendicular to the suction surface, or may form an acute angle or an obtuse angle with the suction surface.
In the present embodiment, the number of the openings 17 is not limited, and may be one, two or more, and the plurality of openings 17 may be provided at intervals. The shape of the opening 17 may be rectangular, hole-shaped or other shapes. When the number of openings 17 is multiple, the flexible extension 2 has the same number of bends 25, accordingly. Meanwhile, a part of the bent portion 25 may be fitted into the opening 17, or the whole bent portion 25 may be fitted into the opening 17.
Further, with reference to fig. 3, in the present embodiment, the wind turbine blade further includes a limiting member 5, and the limiting member 5 is disposed at one end of the bending portion 25 extending into the suction surface and is accommodated in the blade body 1. Specifically, the limiting member 5 may be an adhesive glue, which is coated at the opening 17, and the bent portion 25 can be firmly fixed at the opening 17 by the adhesive glue. The limiting part 5 may also be a limiting block, which is fixedly connected to one end of the bending part 25, which extends into the blade body 1, and the projection of the limiting block on the suction surface 11 along the chord direction D is greater than the length of the opening 17 in the chord direction, so that the limiting block can block the opening 17, and the bending part 25 is prevented from falling off from the opening 17. The limiting member 5 may also be a component known in the art and will not be described in detail herein.
Fan implementation mode
As shown in fig. 13, the present invention further provides a fan, which includes the wind power blade, and in the operation process of the fan 100, since the flexible extending portion 2 is indirectly connected to the suction surface 11 through the bending portion 25, the force acting on the flexible extending portion 2 is firstly transmitted to the bending portion 25, but not directly acting on the connection between the flexible extending portion 2 and the bending portion 25, so that the separation of the flexible extending portion 2 and the suction surface 11 due to the force is effectively avoided, the probability of the flexible extending portion 2 falling off from the blade body 1 is greatly reduced, and the maintenance cost is reduced.
It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the description. The invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for carrying out the invention and will enable those skilled in the art to utilize the invention.

Claims (17)

1. A wind turbine blade, comprising:
a blade body including a suction side and a pressure side; and
the flexible extension part comprises a first end part and a second end part, the first end part is provided with a bending part, the bending part is connected to the suction surface, the second end part freely extends to the rear edge of the blade body, and the flexible extension part can generate passive deformation so as to change the flow path of the airflow along the suction surface.
2. The wind turbine blade as claimed in claim 1, wherein the flexible extension portion comprises an extension portion body and the bent portion, the bent portion is disposed at an end of the extension portion body facing the front edge of the blade body, and the bent portion comprises a folded edge extending towards the rear edge of the blade body, and the folded edge is connected to the suction surface.
3. The wind turbine blade as claimed in claim 2, wherein the bent portion forms a slope on a side facing the front edge of the blade body.
4. The wind turbine blade as claimed in claim 2, wherein the bent portion comprises a connecting portion, one end of the connecting portion starts from an end surface of the folded edge facing the leading edge and extends towards the leading edge along the suction surface, one side of the connecting portion facing the leading edge of the blade body forms an inclined surface, and the connecting portion is connected to the suction surface.
5. The wind turbine blade as claimed in claim 1, wherein the flexible extension portion includes an extension portion body and the bending portion, the bending portion is disposed at an end of the extension portion body facing a front edge of the blade body, the suction surface is provided with an opening, and the bending portion is embedded in the opening.
6. The wind power blade according to claim 5, wherein the wind power blade further comprises a limiting member, and the limiting member is disposed at one end of the bent portion extending into the suction surface and is accommodated in the blade body.
7. The wind blade as set forth in claim 1 wherein said flexible extension is plate-like.
8. The wind power blade according to claim 1, wherein the bent portion is connected to a preset region of the suction surface, and the preset region is 40% -95% of a chord length from a front edge of the blade body.
9. The wind blade as claimed in any of claims 1-8, further comprising a stiffener, the stiffener comprising:
one end of the first reinforcing part is connected to one side, away from the suction surface, of the flexible extending part, and the other end of the first reinforcing part is connected to the suction surface;
and/or the presence of a gas in the gas,
one end of the second reinforcing member is connected to one side of the flexible extending portion, which faces the suction surface, and the other end of the second reinforcing member is connected to the suction surface.
10. Wind turbine blade according to any of claims 1 to 8, wherein the flexible extension is provided with a flow guiding structure.
11. The wind blade as set forth in claim 10, wherein the flow-directing structure comprises:
the drainage tube is connected to the flexible extending part, one end of the drainage tube is exposed out of the side wall of the flexible extending part, which is far away from the suction surface, and the other end of the drainage tube is exposed out of the side wall of the flexible extending part, which is far towards the suction surface;
and/or the presence of a gas in the gas,
a groove disposed on a surface of the flexible extension portion facing away from the suction surface, the groove extending from the first end to the second end of the flexible extension portion.
12. The wind blade of any of claims 1-8 wherein the flexible extension has a stiffening rib extending from the first end to the second end.
13. The wind blade of any of claims 1-8 wherein the end face of the second end of the flexible extension extends beyond the trailing edge of the blade body.
14. The wind blade of claim 13 wherein the portion of the flexible extension beyond the trailing edge of the blade body has a chordwise length less than or equal to 20% of a chord length of the blade body.
15. The wind blade of claim 13 wherein the portion of the flexible extension beyond the trailing edge of the blade body has a bend.
16. The wind power blade according to any one of claims 1 to 8, wherein the number of the flexible extensions is plural, the plural flexible extensions are arranged along the axial direction of the blade body, and the distance between two opposite end surfaces of two adjacent flexible extensions is 0-200 mm.
17. A wind turbine comprising a wind blade according to any of claims 1 to 16.
CN201811638031.4A 2018-12-29 2018-12-29 Wind power blade and fan Pending CN111379660A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102549258A (en) * 2009-10-08 2012-07-04 Lm玻璃纤维制品有限公司 Wind turbine blade with longitudinally extending flow guiding device having a plate-shaped element
CN102705176A (en) * 2012-05-18 2012-10-03 上海交通大学 Wind turbine blade with embedded diversion pipe capable of controlling tip vortex
US20170218916A1 (en) * 2014-08-05 2017-08-03 Lm Wp Patent Holding A/S Wind turbine blade provided with surface mounted device
US20180258912A1 (en) * 2017-03-09 2018-09-13 General Electric Company Flexible Extension for Wind Turbine Rotor Blades
CN209414039U (en) * 2018-12-29 2019-09-20 中材科技风电叶片股份有限公司 Wind electricity blade and blower

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102549258A (en) * 2009-10-08 2012-07-04 Lm玻璃纤维制品有限公司 Wind turbine blade with longitudinally extending flow guiding device having a plate-shaped element
CN102705176A (en) * 2012-05-18 2012-10-03 上海交通大学 Wind turbine blade with embedded diversion pipe capable of controlling tip vortex
US20170218916A1 (en) * 2014-08-05 2017-08-03 Lm Wp Patent Holding A/S Wind turbine blade provided with surface mounted device
US20180258912A1 (en) * 2017-03-09 2018-09-13 General Electric Company Flexible Extension for Wind Turbine Rotor Blades
CN209414039U (en) * 2018-12-29 2019-09-20 中材科技风电叶片股份有限公司 Wind electricity blade and blower

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