CN109113926B - Blade tip extending structure and method of wind power blade - Google Patents
Blade tip extending structure and method of wind power blade Download PDFInfo
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- CN109113926B CN109113926B CN201811338717.1A CN201811338717A CN109113926B CN 109113926 B CN109113926 B CN 109113926B CN 201811338717 A CN201811338717 A CN 201811338717A CN 109113926 B CN109113926 B CN 109113926B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 78
- 239000004744 fabric Substances 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 238000009787 hand lay-up Methods 0.000 claims abstract description 8
- 239000000805 composite resin Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011162 core material Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
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- 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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- Sustainable Development (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a blade tip extension structure and a method of a wind power blade, wherein a blade tip extension transition assembly is filled between the blade tips of new and old blades to carry out follow-up, so that the continuity of the movement of the new and old blade tips is ensured, meanwhile, the blade tips are effectively and reliably prolonged, the structure body of a basic blade tip is prevented from being cut off, the rigidity of the basic blade tip is effectively utilized, and the economic benefit is improved; in addition, the invention fully considers the stress transmission of the two main load directions of waving and shimmy between the new and old blade tips and considers the moment effect of blade tip bending-torsion coupling, and provides box-type beam cap and web combined connection, thereby effectively improving the connection reliability; for the connection of new and old blade tips, the invention also combines the mode of using hand lay-up glass cloth and vacuum bag pressing, avoids using adhesive, and further improves the connection reliability.
Description
Technical Field
The invention relates to the field of wind power blades, in particular to a blade tip extending structure and a blade tip extending method for extending an original wind power blade.
Background
Wind power blades are the most important parts of a wind generating set for capturing wind energy, and under the condition that the same wind resources and the pneumatic performances of the blades are similar, the larger the swept area of the blades is, the larger the generated energy of the blades is. In order to increase the power generation of the blade, various methods for increasing the power and the efficiency are presented in the prior art, wherein the extension of the blade tip is a very effective one. Compared with other modes, the cost for prolonging the blade tip is lower, and the recovery period is short, so that more and more manufacturers choose to prolong the original blade. In the prior art, the blade is lengthened in a mode of adding a blade tip extension section on the basis of the original blade, and the prevention of new blade tip falling is the most important for ensuring the reliability and effectiveness of blade tip installation. The structural design is to avoid abrupt change of rigidity and strictly control the thickness of the adhesive. However, in the prior art, most of blade tips of original blades are cut off, the length of the blades is prolonged by bonding a new prefabricated member with a longer blade tip extension section, and the main problem of the mode is that glass fiber reinforced plastic materials of the blade tips of the cut off parts are wasted, so that the structural design of the original blade tips cannot be fully utilized.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a blade tip extension structure and a method of a wind power blade, wherein a sandwich structure is filled between the blade tips of new and old blades to carry out follow-up, so that the continuity of the movement of the new and old blade tips is ensured, the blade tips are effectively and reliably prolonged, the original blade tip glass fiber reinforced plastic body is prevented from being cut off, the rigidity of the original blade tips is effectively utilized, and the economic benefit is improved; in addition, the invention fully considers the stress transmission of the two main load directions of waving and shimmy between the new and old blade tips and considers the moment effect of blade tip bending-torsion coupling, and provides box-type beam cap and web combined connection, thereby effectively improving the connection reliability; for the connection of new and old blade tips, the invention also combines the mode of using hand lay-up glass cloth and vacuum bag pressing, avoids using adhesive, and further improves the connection reliability.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the blade tip extension structure of the wind power blade comprises a basic blade tip section, a blade tip extension transition assembly, a prefabricated blade tip extension section and an extension transition zone skin, wherein the basic blade tip section and the prefabricated blade tip extension section are sequentially arranged along a blade pitch axis,
the blade tip extension transition assembly is arranged in an extension transition area of the basic blade tip section and comprises a plurality of groups of shimmy direction supporting components and at least one group of waving direction supporting components, wherein,
the plurality of groups of shimmy direction supporting components are arranged on the basic blade tip section at intervals along the direction of the blade pitch axis, each group of shimmy direction supporting components comprises a front edge supporting piece and a tail edge supporting piece, the inner sides of each front edge supporting piece and each tail edge supporting piece are respectively provided with a mounting groove matched with the front edge and the tail edge of the basic blade tip section in shape, and each front edge supporting piece and each tail edge supporting piece are respectively fixedly arranged on the front edge and the tail edge of the basic blade tip section through the mounting grooves;
each group of the flapping direction supporting components comprises a pressure noodle-shaped extension piece and a suction noodle-shaped extension piece, the inner side surfaces of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece are respectively and fixedly arranged on the pressure surface and the suction surface of the basic blade tip section along the direction of the variable pitch axis of the blade along a shape, the chord direction arrangement positions of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece on the basic blade tip section are at least basically the same as the chord direction positions of the variable pitch axis of the blade, and the flapping direction supporting components are formed into beam caps of the extension transition areas;
-said prefabricated tip extension comprising a prefabricated box assembly and a prefabricated tip skin, wherein,
the prefabricated box assembly comprises an upper wall surface, a lower wall surface, a left wall surface and a right wall surface, wherein the upper wall surface and the lower wall surface are formed into a beam cap of the prefabricated blade tip extension section, the left wall surface and the right wall surface are formed into webs of the prefabricated blade tip extension section, the upper wall surface and the lower wall surface are fixedly connected to the inner side of the prefabricated blade tip skin along the length direction of the web, the chord direction arrangement positions of the upper wall surface and the lower wall surface are at least basically the same as the chord direction positions of the blade pitch axis,
the tail end of the prefabricated box type component in the length direction extends out of the prefabricated tip skin and is not covered by the prefabricated tip skin, the tail end of the prefabricated box type component and the tail end of the waving direction supporting component are mutually abutted along the axis direction of the variable pitch of the blade, and the two mutually abutted outer surfaces are connected by using unidirectional cloth,
the extended transition zone skin completely covers the tip extension transition assembly and the areas of the prefabricated tip extension sections not covered by the prefabricated tip skin, and the extended transition zone skin has a uniform aerodynamic profile surface with the surface areas of the base tip sections not provided with the tip extension assembly and the surface areas of the prefabricated tip skin.
Preferably, at least for the surface area of the base tip section where the tip extension transition assembly is located, the coating is polished and roughened prior to locating the tip extension transition assembly.
Preferably, the base blade tip section requires removal of the lightning receptor disposed on its surface prior to disposing the blade tip extension transition assembly.
Preferably, the shimmy direction supporting component, the waving direction supporting component and the left and right wall surfaces of the prefabricated box-shaped component are all fiber reinforced resin composite structural members, and core materials are filled in the fiber reinforced resin composite structural members.
Preferably, the shape of the outside surface of the shimmy direction support member and the flap direction support member substantially conforms to the aerodynamic profile surface.
Preferably, the shimmy direction supporting component and the flapwise direction supporting component are fixedly arranged on the basic blade tip section by using structural adhesive.
Preferably, the tangent lines of the pressure surface and the initial end surface of the suction surface of the prefabricated blade tip skin form included angles with the pitch axis of the blade.
Further, tangential directions of the starting end surfaces of the pressure surface and the suction surface of the prefabricated blade tip skin are opposite.
Preferably, the tangent lines of the pressure surface and the initial end surface of the suction surface of the skin of the extension transition zone form included angles with the pitch axis of the blade.
Further, tangential directions of the starting end surfaces of the pressure surface and the suction surface of the skin of the extension transition zone are opposite.
Preferably, the extended transition section skin covers the tip extension assembly and the area of the preformed tip extension section not covered by the preformed tip skin using hand lay-up and vacuum bagging.
Preferably, the tip portion of the prefabricated tip extension is provided with a lightning receptor.
According to another aspect of the present invention, there is also provided a tip extension method of a wind power blade corresponding to the tip extension structure described above, characterized in that the tip extension method includes the steps of,
the method comprises the following steps of (1) removing a lightning arrester arranged on the surface of a basic blade tip section, and carrying out polishing coating and roughening treatment on the surface area of the basic blade tip section, which is required to be provided with a blade tip extension transition assembly;
SS2. preparing a blade tip extension transition assembly comprising a plurality of sets of lag-shake direction support members, at least one set of flapwise direction support members, wherein,
the plurality of groups of shimmy direction supporting components are arranged on the basic blade tip section at intervals along the direction of the blade pitch axis, each group of shimmy direction supporting components comprises a front edge supporting piece and a tail edge supporting piece, the inner sides of each front edge supporting piece and each tail edge supporting piece are respectively provided with a mounting groove matched with the front edge and the tail edge of the basic blade tip section in shape, and each front edge supporting piece and each tail edge supporting piece are respectively fixedly arranged on the front edge and the tail edge of the basic blade tip section through the mounting grooves;
each group of the flapping direction supporting components comprises a pressure noodle-shaped extension piece and a suction noodle-shaped extension piece, the inner side surfaces of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece are respectively and fixedly arranged on the pressure surface and the suction surface of the basic blade tip section along the direction of the variable pitch axis of the blade along a shape, the chord direction arrangement positions of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece on the basic blade tip section are at least basically the same as the chord direction positions of the variable pitch axis of the blade, and the flapping direction supporting components are formed into beam caps of the extension transition areas;
SS3, preparing a prefabricated blade tip extension section, wherein the prefabricated blade tip extension section comprises a prefabricated box assembly and a prefabricated blade tip skin,
the prefabricated box assembly comprises an upper wall surface, a lower wall surface, a left wall surface and a right wall surface, wherein the upper wall surface and the lower wall surface are formed into a beam cap of the prefabricated blade tip extension section, the left wall surface and the right wall surface are formed into webs of the prefabricated blade tip extension section, the upper wall surface and the lower wall surface are fixedly connected to the inner side of the prefabricated blade tip skin along the length direction of the web, the chord direction arrangement positions of the upper wall surface and the lower wall surface are at least basically the same as the chord direction positions of the blade pitch axis,
the tail end of the prefabricated box assembly in the length direction extends out of the prefabricated blade tip skin and is not covered by the prefabricated blade tip skin, the tail end of the prefabricated box assembly and the tail end of the waving direction supporting component are mutually abutted along the variable-pitch axis direction of the blade, and the two mutually abutted outer surfaces are connected by using unidirectional cloth;
SS4, setting an extension transition zone skin, wherein the extension transition zone skin completely covers the blade tip extension transition assembly and the area of the prefabricated blade tip extension section, which is not covered by the prefabricated blade tip skin, and the extension transition zone skin and the surface area of the base blade tip section, which is not provided with the blade tip extension transition assembly, and the surface area of the prefabricated blade tip skin have the same aerodynamic appearance surface.
Preferably, in the steps SS2 and SS3, the shimmy direction support member, the flapwise direction support member, and the left and right wall surfaces of the prefabricated box assembly are all fiber reinforced resin composite structural members, and the interiors thereof are filled with core materials.
Preferably, in step SS2, the shape of the outside surface of the shimmy direction support member and the flap direction support member substantially conforms to the aerodynamic profile surface.
Preferably, in step SS2, the shimmy direction support component and the flapwise direction support component are fixedly disposed on the base blade tip section by using a structural adhesive.
Preferably, in step SS3, the tangent lines of the pressure surface and the suction surface of the prefabricated tip cover have an included angle with the pitch axis of the blade.
Further, in step SS3, the tangential directions of the starting end surfaces of the pressure surface and the suction surface of the prefabricated tip cover are opposite.
Preferably, in step SS4, the tangent lines of the pressure surface and the start end surface of the suction surface of the skin in the extension transition area form an included angle with the pitch axis of the blade.
Further, in step SS4, the tangential directions of the starting end surfaces of the pressure surface and the suction surface of the extended transition region skin are opposite.
Preferably, in step SS4, the extended transition section skin covers the tip extension assembly and the area of the prefabricated tip extension section not covered by the prefabricated tip skin using hand lay-up and vacuum bagging.
Compared with the prior art, the wind power blade tip extension structure and method have the advantages that the tip extension transition assembly is filled between the tips of the new blade and the old blade to carry out follow-up, so that the continuity of the movement of the new blade tip and the old blade tip is ensured, meanwhile, the tips are effectively and reliably prolonged, the structural body of the base blade tip is prevented from being cut off, the rigidity of the base blade tip is effectively utilized, and the economic benefit is improved; in addition, the invention fully considers the stress transmission of the two main load directions of waving and shimmy between the new and old blade tips and considers the moment effect of blade tip bending-torsion coupling, and provides box-type beam cap and web combined connection, thereby effectively improving the connection reliability; for the connection of new and old blade tips, the invention also combines the mode of using hand lay-up glass cloth and vacuum bag pressing, avoids using adhesive, and further improves the connection reliability.
Drawings
FIG. 1 is a schematic view of a tip extension of a wind turbine blade of the present invention;
FIG. 2 is a schematic view of a base tip section structure;
FIG. 3 is a schematic view of the structure of the shimmy direction support member;
FIG. 4 is a schematic view of the structure of a shimmy direction support member disposed on a base blade tip section;
FIG. 5 is a schematic view of a swing direction support member structure;
FIG. 6 is a schematic view of a structure in which a roll and flap direction support member is simultaneously disposed on a base tip section;
FIG. 7 is a schematic view of the structure of a prefabricated box assembly;
FIG. 8 is a schematic view of a prefabricated tip skin;
FIG. 9 is a schematic view of a preformed tip extension;
FIG. 10 is a schematic illustration of the connection between a base tip section and a preformed tip extension.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and examples.
As shown in fig. 1 to 10, the tip extension structure of the wind power blade of the present invention includes a base tip section 100, a tip extension transition assembly 200, a prefabricated tip extension section 300, and an extension transition zone skin 400, where the base tip section 100 and the prefabricated tip extension section 300 are sequentially arranged along a blade pitch axis 500.
As shown in fig. 2 to 6, the tip extension transition assembly 200 is disposed in an extension transition area of the base tip section 100, and includes a plurality of sets of shimmy direction supporting components 210 and at least one set of flapwise direction supporting components 220, where the plurality of sets of shimmy direction supporting components 210 are disposed on the base tip section 100 at intervals along a direction of a blade pitch axis 500, each set of shimmy direction supporting components 210 includes a leading edge supporting component 211 and a trailing edge supporting component 212, an installation groove adapted to a shape of a leading edge and a trailing edge of the base tip section 100 is disposed on an inner side of each of the leading edge supporting component and the trailing edge supporting component, and each of the leading edge supporting component and the trailing edge supporting component is fixedly disposed on the leading edge and the trailing edge of the base tip section 100 through the installation groove thereof; each set of the flapwise direction support member 220 includes a pressure-noodle-shaped extension member and a suction-noodle-shaped extension member, the inner side surfaces of the pressure-noodle-shaped extension member and the suction-noodle-shaped extension member are respectively and fixedly disposed on the pressure surface and the suction surface of the base tip section 100 along the direction of the blade pitch axis 500, and the chord-wise disposition positions of the pressure-noodle-shaped extension member and the suction-noodle-shaped extension member on the base tip section 100 are at least substantially the same as the chord-wise position of the blade pitch axis 500, and the flapwise direction support member 220 is formed as a spar cap for extending the transition region.
7-10, the prefabricated tip extension 300 includes a prefabricated box assembly 310 and a prefabricated tip skin 320, where the prefabricated box assembly includes an upper wall 311, a lower wall 311, and a left wall 312, the upper wall 311 and the lower wall 311 are formed as a beam cap of the prefabricated tip extension 300, the left wall 312 and the right wall 312 are formed as a web of the prefabricated tip extension 300, the upper wall and the lower wall are fixedly connected to an inner side of the prefabricated tip skin 320 along a length direction thereof, and a chord-wise arrangement position of the upper wall 311 and the lower wall is at least substantially the same as a chord-wise position of the blade pitch axis 500; the ends of the prefabricated box assembly 310 in the length direction extend out of the prefabricated tip skin 320 and are not covered by the prefabricated tip skin 320, the ends of the prefabricated box assembly 310 and the ends of the flapwise direction support member 220 are abutted to each other along the blade pitch axis 500 direction, and are connected using unidirectional cloth 600 on the outer surfaces where the two are abutted to each other.
As shown in fig. 1, the extended transition section skin 400 completely covers the tip extension transition assembly 200 and the areas of the prefabricated tip extension section 300 not covered by the prefabricated tip skin, and the extended transition section skin 400 has a uniform aerodynamic profile surface with the surface areas of the base tip section 100 not provided with the tip extension transition assembly 200 and the surface areas of the prefabricated tip skin. Preferably, the extended transition section skin 400 covers the tip extension assembly 200 and the areas of the preformed tip extension section 300 not covered by the preformed tip skin 320 using hand lay-up and vacuum bagging.
As a preferred embodiment, at least for the surface area of the base tip section 100 where the tip extension transition assembly 200 is located, the coating may need to be ground and roughened prior to locating the tip extension transition assembly 200. In addition, the base tip section 100 requires removal of the lightning receptor disposed on its surface prior to the tip extension transition assembly 200 being disposed.
Preferably, the shimmy direction support member 210, the flapwise direction support member 220, and the left and right wall surfaces 312 of the prefabricated box assembly 310 are all fiber reinforced resin composite structural members, and the interiors thereof are filled with core materials. The shape of the outer side surfaces of the shimmy direction support member 210 and the flapwise direction support member 220 substantially coincides with the aerodynamic profile surface. The roll direction support member 210, the flapwise direction support member 220 are fixedly disposed on the base tip section 100 using structural glue.
Preferably, the tangent of the pressure side and suction side start surfaces of the preformed tip cover 320 are angled with respect to the blade pitch axis 500, and the tangent of the pressure side and suction side start surfaces of the preformed tip cover 320 are oriented in opposite directions. Similarly, the tangent of the beginning end of the pressure and suction sides of the extended transition skin 400 is at an angle to the blade pitch axis 500, and the tangent of the beginning end of the pressure and suction sides of the extended transition skin 400 is in the opposite direction.
By utilizing the blade tip extension structure, when the blade tip of the wind power blade is extended, the blade tip extension structure comprises the following steps:
the method comprises the following steps of (1) removing a lightning arrester arranged on the surface of a basic blade tip section 100, and carrying out polishing coating and roughening treatment on the surface area of the basic blade tip section 100, in which a blade tip extension transition assembly 200 is required to be arranged;
SS2. preparing a tip extension transition assembly 200, the tip extension transition assembly 200 comprising a plurality of sets of lag direction support members 210, at least one set of flapwise direction support members 220, wherein,
the plurality of groups of shimmy direction supporting components 210 are arranged on the basic blade tip section 100 at intervals along the direction of the blade pitch axis 500, each group of shimmy direction supporting components 210 comprises a front edge supporting piece 211 and a tail edge supporting piece 212, the inner sides of each front edge supporting piece 211 and each tail edge supporting piece 212 are respectively provided with a mounting groove matched with the front edge and the tail edge of the basic blade tip section 100 in shape, and each front edge supporting piece 211 and each tail edge supporting piece 212 are respectively fixedly arranged on the front edge and the tail edge of the basic blade tip section 100 through the mounting grooves;
each set of the flapwise direction support component 220 comprises a pressure noodle-shaped extension and a suction noodle-shaped extension, the inner side surfaces of the pressure noodle-shaped extension and the suction noodle-shaped extension are respectively and fixedly arranged on the pressure surface and the suction surface of the basic blade tip section 100 along the direction of the blade pitch axis 500 along a shape, the chord-wise arrangement positions of the pressure noodle-shaped extension and the suction noodle-shaped extension on the basic blade tip section 100 are at least basically the same as the chord-wise positions of the blade pitch axis 500, and the flapwise direction support component 220 is formed into a beam cap for extending the transition region; the shape of the outside surfaces of the shimmy direction support member 210 and the flapwise direction support member 220 substantially conforms to the overall aerodynamic profile surface. And the lag direction support member 210, the flap direction support member 220 are fixedly disposed on the base tip section 100 using structural glue.
SS3, preparing a prefabricated tip extension 300, the prefabricated tip extension 300 comprising a prefabricated box assembly 310 and a prefabricated tip skin 320, wherein,
the prefabricated box assembly 310 includes upper and lower wall surfaces 311 and left and right wall surfaces 312, the upper and lower wall surfaces 311 are formed as a spar cap of the prefabricated tip extension 300, the left and right wall surfaces 312 are formed as webs of the prefabricated tip extension 300, the upper and lower wall surfaces 311 are fixedly connected to the inner side of the prefabricated tip skin 320 along the length direction thereof, and the chord-wise arrangement positions of the upper and lower wall surfaces 311 are at least substantially the same as the chord-wise positions of the blade pitch axis 500,
the end of the prefabricated box assembly 310 in the length direction extends out of the prefabricated tip skin 320 and is not covered by the prefabricated tip skin 320, the end of the prefabricated box assembly 310 and the end of the flapping direction support member 220 are mutually abutted along the direction of the blade pitch axis 500, and the two are connected by using unidirectional cloth 600 on the mutually abutted outer surfaces; the tangent lines of the pressure surface and the initial end surface of the suction surface of the prefabricated tip cover 320 have an included angle beta with the blade pitch axis 500.
SS4. Providing an extended transition zone skin 400, the extended transition zone skin 400 fully covering the tip extension transition assembly 200 and the areas of the prefabricated tip extension section 300 not covered by the prefabricated tip skin 320, and the extended transition zone skin 400 having a uniform aerodynamic profile surface with the surface areas of the base tip section 100 not provided with the tip extension transition assembly 200 and the surface areas of the prefabricated tip skin 320. The tangent line of the initial end surfaces of the pressure surface and the suction surface of the extension transition region skin 400 has an included angle beta with the blade pitch axis 500, and the tangent directions of the initial end surfaces of the pressure surface and the suction surface of the extension transition region skin 400 are opposite.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (19)
1. The blade tip extension structure of the wind power blade comprises a basic blade tip section, a blade tip extension transition assembly, a prefabricated blade tip extension section and an extension transition zone skin, wherein the basic blade tip section and the prefabricated blade tip extension section are sequentially arranged along a blade pitch axis,
the blade tip extension transition assembly is arranged in an extension transition area of the basic blade tip section and comprises a plurality of groups of shimmy direction supporting components and at least one group of waving direction supporting components, wherein,
the plurality of groups of shimmy direction supporting components are arranged on the basic blade tip section at intervals along the direction of the blade pitch axis, each group of shimmy direction supporting components comprises a front edge supporting piece and a tail edge supporting piece, the inner sides of each front edge supporting piece and each tail edge supporting piece are respectively provided with a mounting groove matched with the front edge and the tail edge of the basic blade tip section in shape, and each front edge supporting piece and each tail edge supporting piece are respectively fixedly arranged on the front edge and the tail edge of the basic blade tip section through the mounting grooves;
each group of the flapping direction supporting components comprises a pressure noodle-shaped extension piece and a suction noodle-shaped extension piece, the inner side surfaces of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece are respectively and fixedly arranged on the pressure surface and the suction surface of the basic blade tip section along the direction of the variable pitch axis of the blade along a shape, the chord direction arrangement positions of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece on the basic blade tip section are at least the same as the chord direction positions of the variable pitch axis of the blade, and the flapping direction supporting components are formed into beam caps of the extension transition areas;
-said prefabricated tip extension comprising a prefabricated box assembly and a prefabricated tip skin, wherein,
the prefabricated box assembly comprises an upper wall surface, a lower wall surface, a left wall surface and a right wall surface, wherein the upper wall surface and the lower wall surface are formed into a beam cap of the prefabricated blade tip extension section, the left wall surface and the right wall surface are formed into webs of the prefabricated blade tip extension section, the upper wall surface and the lower wall surface are fixedly connected to the inner side of the prefabricated blade tip skin along the length direction of the web, the chord direction arrangement positions of the upper wall surface and the lower wall surface are at least the same as the chord direction positions of the blade pitch axes,
the tail end of the prefabricated box type component in the length direction extends out of the prefabricated tip skin and is not covered by the prefabricated tip skin, the tail end of the prefabricated box type component and the tail end of the waving direction supporting component are mutually abutted along the axis direction of the variable pitch of the blade, and the two mutually abutted outer surfaces are connected by using unidirectional cloth,
the extended transition zone skin completely covers the tip extension transition assembly and the area of the prefabricated tip extension section not covered by the prefabricated tip skin, and the extended transition zone skin has a uniform aerodynamic profile surface with the surface area of the base tip section not provided with the tip extension assembly and the surface area of the prefabricated tip skin;
at least for the surface area of the basic blade tip section where the blade tip extension transition assembly is arranged, polishing a coating layer and roughening the surface before arranging the blade tip extension transition assembly;
before the base blade tip section is provided with the blade tip extension transition assembly, a lightning arrester arranged on the surface of the base blade tip section needs to be removed.
2. The tip extension structure of a wind power blade according to claim 1, wherein the lag direction supporting member, the flapwise direction supporting member, and the left and right wall surfaces of the prefabricated box assembly are fiber reinforced resin composite structural members, and the interiors thereof are filled with core materials.
3. The tip extension structure of a wind power blade according to claim 1, wherein the shape of the outside surface of the edgewise support member and the flapwise support member is identical to the aerodynamic profile surface.
4. The tip extension structure of a wind power blade according to claim 1, wherein the edgewise support member and the flapwise support member are fixedly disposed on the base tip section using a structural adhesive.
5. The tip extension structure of a wind power blade according to claim 1, wherein tangents of a pressure surface and a suction surface of the prefabricated tip skin form an included angle with a pitch axis of the blade.
6. The tip extension structure of a wind power blade according to claim 5, wherein tangential directions of a pressure surface and a suction surface of the prefabricated tip skin are opposite.
7. The wind power blade tip extension structure according to claim 1, wherein tangents of the start end surfaces of the pressure surface and the suction surface of the extension transition region skin form an included angle with the blade pitch axis.
8. The wind power blade tip extension structure according to claim 5, further characterized in that tangential directions of the start end surfaces of the pressure surface and the suction surface of the extension transition zone skin are opposite.
9. The tip extension structure of a wind power blade according to claim 1, wherein the extension transition zone skin covers the tip extension assembly and the areas of the prefabricated tip extension section not covered by the prefabricated tip skin using hand lay-up and vacuum bagging.
10. The tip extension structure of a wind power blade according to claim 1, wherein a tip portion of the prefabricated tip extension is provided with a lightning arrester.
11. A method for extending the tip of a wind power blade by using the tip extending structure of the wind power blade according to any one of claims 1 to 10, characterized in that the method for extending the tip comprises the following steps,
SS1, removing a lightning arrester arranged on the surface of a basic blade tip section, and carrying out polishing coating and roughening treatment on the surface area of the basic blade tip section, which is required to be provided with a blade tip extension transition assembly;
SS2, preparing a blade tip extension transition assembly, wherein the blade tip extension transition assembly comprises a plurality of groups of shimmy direction supporting components and at least one group of waving direction supporting components,
the plurality of groups of shimmy direction supporting components are arranged on the basic blade tip section at intervals along the direction of the blade pitch axis, each group of shimmy direction supporting components comprises a front edge supporting piece and a tail edge supporting piece, the inner sides of each front edge supporting piece and each tail edge supporting piece are respectively provided with a mounting groove matched with the front edge and the tail edge of the basic blade tip section in shape, and each front edge supporting piece and each tail edge supporting piece are respectively fixedly arranged on the front edge and the tail edge of the basic blade tip section through the mounting grooves;
each group of the flapping direction supporting components comprises a pressure noodle-shaped extension piece and a suction noodle-shaped extension piece, the inner side surfaces of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece are respectively and fixedly arranged on the pressure surface and the suction surface of the basic blade tip section along the direction of the variable pitch axis of the blade along a shape, the chord direction arrangement positions of the pressure noodle-shaped extension piece and the suction noodle-shaped extension piece on the basic blade tip section are at least the same as the chord direction positions of the variable pitch axis of the blade, and the flapping direction supporting components are formed into beam caps of the extension transition areas;
SS3. Preparing a prefabricated tip extension comprising a prefabricated box assembly and a prefabricated tip skin, wherein,
the prefabricated box assembly comprises an upper wall surface, a lower wall surface, a left wall surface and a right wall surface, wherein the upper wall surface and the lower wall surface are formed into a beam cap of the prefabricated blade tip extension section, the left wall surface and the right wall surface are formed into webs of the prefabricated blade tip extension section, the upper wall surface and the lower wall surface are fixedly connected to the inner side of the prefabricated blade tip skin along the length direction of the web, the chord direction arrangement positions of the upper wall surface and the lower wall surface are at least the same as the chord direction positions of the blade pitch axes,
the tail end of the prefabricated box assembly in the length direction extends out of the prefabricated blade tip skin and is not covered by the prefabricated blade tip skin, the tail end of the prefabricated box assembly and the tail end of the waving direction supporting component are mutually abutted along the variable-pitch axis direction of the blade, and the two mutually abutted outer surfaces are connected by using unidirectional cloth;
and SS4, setting an extension transition zone skin, wherein the extension transition zone skin completely covers the blade tip extension transition assembly and the area of the prefabricated blade tip extension section which is not covered by the prefabricated blade tip skin, and the extension transition zone skin and the surface area of the base blade tip section which is not provided with the blade tip extension assembly and the surface area of the prefabricated blade tip skin have the same aerodynamic appearance surface.
12. The method according to claim 11, wherein in steps SS2 and SS3, the lag-vibration direction supporting member, the flapping direction supporting member, and the left and right wall surfaces of the prefabricated box assembly are each fiber-reinforced resin composite structural members, and the inside of each of the fiber-reinforced resin composite structural members is filled with a core material.
13. The method of extending a tip of a wind power blade according to claim 11, wherein in step SS2, the shape of the outside surface of the edgewise support member and the flapwise support member is identical to the aerodynamic profile surface.
14. The method for extending the tip of a wind power blade according to claim 11, wherein in step SS2, the edgewise support member and the flapwise support member are fixedly disposed on the base tip section using a structural adhesive.
15. The method for extending the tip of a wind power blade according to claim 11, wherein in step SS3, the tangent line of the starting end surfaces of the pressure surface and the suction surface of the prefabricated tip skin forms an included angle with the pitch axis of the blade.
16. The method for extending the tip of a wind power blade according to claim 15, wherein in step SS3, tangential directions of the starting end surfaces of the pressure surface and the suction surface of the prefabricated tip skin are opposite.
17. The method for extending the tip of a wind power blade according to claim 11, wherein in step SS4, a tangent line of a pressure surface and a suction surface of the extended transition area skin has an included angle with the pitch axis of the blade.
18. The method for extending the tip of a wind turbine blade according to claim 17, wherein in step SS4, tangential directions of the starting end surfaces of the pressure surface and the suction surface of the extended transition area skin are opposite.
19. The method of tip extension of a wind turbine blade of claim 11, wherein in step SS4, the extension transition zone skin covers the tip extension assembly and the areas of the prefabricated tip extension sections not covered by the prefabricated tip skin using hand lay-up and vacuum bagging.
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| CN201811338717.1A CN109113926B (en) | 2018-11-12 | 2018-11-12 | Blade tip extending structure and method of wind power blade |
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| CN201811338717.1A CN109113926B (en) | 2018-11-12 | 2018-11-12 | Blade tip extending structure and method of wind power blade |
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| CN109113926A (en) | 2019-01-01 |
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