WO2022057988A1 - Pale d'éolienne - Google Patents

Pale d'éolienne Download PDF

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Publication number
WO2022057988A1
WO2022057988A1 PCT/DK2021/050281 DK2021050281W WO2022057988A1 WO 2022057988 A1 WO2022057988 A1 WO 2022057988A1 DK 2021050281 W DK2021050281 W DK 2021050281W WO 2022057988 A1 WO2022057988 A1 WO 2022057988A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
flange
outer shell
web flange
wind turbine
Prior art date
Application number
PCT/DK2021/050281
Other languages
English (en)
Inventor
Jonathan Smith
Original Assignee
Vestas Wind Systems A/S
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 Vestas Wind Systems A/S filed Critical Vestas Wind Systems A/S
Publication of WO2022057988A1 publication Critical patent/WO2022057988A1/fr

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Classifications

    • 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
    • F05B2230/00—Manufacture
    • F05B2230/50—Building or constructing in particular ways
    • 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
    • F05B2230/00—Manufacture
    • F05B2230/60—Assembly methods
    • 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
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/301—Cross-section characteristics
    • 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
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6003—Composites; e.g. fibre-reinforced
    • 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
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/70—Treatments or modification of materials
    • F05B2280/702—Reinforcements
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates generally to wind turbine blades and more specifically to an assembly comprising a wind turbine blade supported in a blade mould.
  • Modern wind turbine blades typically comprise a shell defining the aerodynamic contour of the blade and one or more longitudinally-extending spars which act as the main loadbearing structures of the blade.
  • a spar typically comprises a shear web which is configured to take up the shear loads experienced by the wind turbine blade in use.
  • the shear web is adhesively bonded between inner surfaces of opposing windward and leeward sides of the shell.
  • the shear web may comprise upper and lower flanges via which the web is bonded to the shell.
  • Excess adhesive is typically provided between the shear web and shell to account for slight variations in shell geometry and web positioning, thereby ensuring that the shear web is bonded to the shell along its length.
  • Non-destructive testing may for example involve emitting ultrasonic signals through the blade shell and receiving reflected signals to build up an image of the arrangement of materials in the shell and within the blade.
  • the ultrasonic signals are reflected at the boundary between a material and a less dense material, such as air. This method of testing may be used to determine the position of the web flanges and assess the quality of the joint between the flanges and shell, for example.
  • surplus adhesive squeezed from between the shear web and shell can introduce challenges to the inspection of the blade.
  • surplus adhesive from between the upper flange and the shell may land on or near to the lower flange, resulting in an irregular surface at the boundary with air inside the blade. This may cause NDT signals to be reflected outside the range of the receiver, resulting in incomplete or unreliable testing data.
  • surplus adhesive landing on or too near to the edge of the flange can make determining the actual position of the flange more challenging.
  • an assembly comprising a wind turbine blade and a blade mould, the wind turbine blade being supported in the blade mould.
  • the wind turbine blade comprises an aerodynamic outer shell having an upper side and a lower side.
  • the blade further comprises a shear web comprising a web panel, an upper web flange and a lower web flange.
  • the web panel extends between the upper web flange and the lower web flange.
  • the upper web flange is connected to the upper side of the outer shell and the lower web flange is connected to the lower side of the outer shell.
  • the upper and lower web flanges are asymmetrically arranged such that, when the wind turbine blade is supported in the blade mould, the upper web flange overhangs the lower web flange.
  • the upper web flange may be connected to the web panel at a proximal edge and the upper web flange extends to a distal edge which is an edge of the upper web flange furthest from the web panel.
  • the lower web flange may be connected to the web panel at a proximal edge and the lower web flange extends to a distal edge which is an edge of the lower web flange furthest from the web panel.
  • the distal edge of the upper web flange extends beyond the distal edge of the lower web flange in a chordwise direction (C) when the blade in the mould, i.e. the distal edges of the upper and lower flanges are not vertically aligned.
  • the web panel may have a first side facing a leading edge of the blade and a second side facing a trailing edge of the blade.
  • the upper web panel and the lower web panel are located on the same side of the web panel.
  • the distal edges of both the upper web flange and the lower web flanges may be located between the web panel and the leading edge, or the distal edges of both the upper web flange and the lower web flange may be located between the web panel and the trailing edge.
  • the shear web may be rotated such that, when the wind turbine blade is supported in the blade mould, the shear web panel is non-vertical.
  • the shear web may be rotated such that, when the wind turbine blade is supported in the blade mould, the shear web panel is inclined at an angle in the range of 1 degree to 20 degrees relative to a vertical axis.
  • the shear web may be rotated such that the shear web panel is inclined at an angle in the range of 1 degree to 10 degrees relative to a vertical axis. More preferably still, the shear web may be rotated such that the shear web panel is inclined at an angle in the range of 1 degree to 5 degrees relative to a vertical axis.
  • the upper web flange and the lower web flange may be of substantially equal width.
  • the upper web flange may be wider than the lower web flange.
  • a first angle defined between the web panel and the upper web flange may be greater than a second angle defined between the web panel and the lower web flange.
  • the first angle may be at least 5 degrees greater than the second angle.
  • the upper web flange may be adhesively bonded to the upper side of the outer shell.
  • the lower web flange may be adhesively bonded to the lower side of the outer shell.
  • the upper side of the outer shell of the wind turbine blade may comprise a first longitudinal reinforcing structure.
  • the lower side of the outer shell may comprise a second reinforcing structure.
  • the upper web flange may be connected to the first longitudinal reinforcing structure.
  • the lower web flange may be connected to the second longitudinal reinforcing structure.
  • the first and second reinforcing structures may be spar caps, stringers, or thickened sections of the shell laminate for example.
  • the reinforcing structures are preferably integrated, e.g. embedded, in the laminate structure of the shell.
  • the reinforcing structures may instead be joined to an inner surface of the shell laminate.
  • the reinforcing structures may be formed of fibre-reinforced polymer.
  • the reinforcing structures may be formed of carbon fibre reinforced polymer.
  • the first and second reinforcing structures may be symmetrically arranged. When the wind turbine blade is supported in the blade mould, the first reinforcing structure may not substantially overhang the second reinforcing structure.
  • the first and second longitudinal reinforcing structure may be of substantially equal width.
  • the shear web may be a trailing edge web.
  • the wind turbine blade may further comprise a main shear web arranged in a first plane.
  • the trailing edge web may be arranged in a second plane that is inclined relative to the first plane.
  • a method of manufacturing a wind turbine blade comprises providing an outer shell structure having an upper side and a lower side, and providing a shear web comprising a web panel, an upper web flange and a lower web flange, the web panel extending between the upper web flange and the lower web flange.
  • the method further comprises arranging the shear web between the upper and lower sides of the outer shell structure, and adhesively bonding at least the upper web flange to the upper side of the outer shell structure.
  • the shear web is arranged such that the upper web flange overhangs the lower web flange during bonding of the upper web flange to the upper side of the outer shell, such that excess adhesive that is squeezed out from between the upper web flange and the outer shell substantially does not collect on the lower web flange.
  • a wind turbine blade comprising an aerodynamic outer shell having an upper side and a lower side.
  • the wind turbine blade further comprises a shear web comprising a web panel, an upper web flange and a lower web flange.
  • the web panel extends between the upper web flange and the lower web flange.
  • the upper web flange is adhesively bonded to the upper side of the outer shell and the lower web flange is connected to the lower side of the outer shell.
  • the upper and lower web flanges are asymmetrically arranged such that the upper web flange overhangs the lower web flange during manufacture of the wind turbine blade according to the method described above.
  • the upper side of the outer shell may be one of a windward or a leeward side.
  • the lower side of the outer shell may be the other of the windward or leeward side.
  • Figure 1 is a schematic exploded view of a wind turbine blade comprising a plurality of shear webs arranged inside an outer shell comprising an upper side and a lower side;
  • Figure 2 is a schematic perspective view of a mould used to form one of the sides of the outer shell
  • Figure 3 is a schematic cross-sectional view of an assembly comprising a wind turbine blade supported in a mould, wherein the blade comprises shear webs with substantially vertical web panels and substantially symmetrical upper and lower web flanges;
  • Figure 4 is a schematic cross-sectional view of the assembly wherein the wind turbine blade supported in the mould comprises a shear web having an upper flange that is wider than the lower web flange such that it overhangs the lower flange;
  • Figure 5 is an enlarged view of Figure 4 showing a trailing edge portion of the wind turbine blade in more detail
  • Figure 6 is a schematic cross-sectional view of the assembly wherein the wind turbine blade supported in the mould comprises a shear web that is rotated such that the web panel is non-vertical and the upper and lower flanges are asymmetrically arranged; and
  • Figure 7 is an enlarged view of Figure 6 showing a trailing edge portion of the wind turbine blade in more detail.
  • FIG. 1 is a schematic exploded view of a wind turbine blade 10.
  • the blade 10 extends longitudinally in a spanwise direction (S) between a root end 12 and a tip end 14, and transversely in a chordwise direction (C) between a leading edge 16 and a trailing edge 18.
  • the blade 10 comprises an aerodynamic outer shell 20 that has an upper side 22a and a lower side 22b.
  • the shell 20 may be formed of a first (e.g. windward) half shell 24a and a second (e.g. leeward) half shell 24b.
  • the upper side of the shell 22a may comprise the windward half shell 24a
  • the lower side of the shell 22b may comprise the leeward half shell 24b.
  • the half shells 24a, 24b are of composite construction, formed of materials such as glass-fibre reinforced plastic (GFRP). When the half shells 24a, 24b are connected together, the shell 20 defines a substantially hollow interior.
  • GFRP glass-fibre reinforced plastic
  • the wind turbine blade 10 comprises a shear web 26 that extends longitudinally in the spanwise direction (S) inside the shell 20, i.e. inside the hollow interior of the blade 10.
  • the wind turbine blade 10 may comprise a plurality of shear webs 26, such as a trailing edge shear web 26a and a main shear web 26b.
  • Each shear web 26 forms part of a spar structure which is configured to absorb bending and torsional loading of the blade 10 in use.
  • the shear webs 26 comprise a web panel 28 that extends between upper and lower web flanges 30a, 30b.
  • the upper web flange 30a is connected to the upper side of the shell 22a
  • the lower web flange 30b is connected to the lower side of the shell 22b.
  • the shear web 26 is preferably bonded to the shell 20 by adhesive between the flanges 30a, 30b and a respective inner surface 32a, 32b of the shell 20.
  • each half shell may be formed separately in a respective mould.
  • Figure 2 shows a mould 34 which may, for example, be used to form the leeward half shell 24b.
  • the mould 34 comprises a mould surface 36 shaped to form a half shell 24 with an aerodynamic contour.
  • the various materials forming the half shell 24 are arranged on the mould surface 36 in a layup 38.
  • parts of the shell 20 may have a composite sandwich structure, comprising core material 40 arranged between skins comprising fibrous material 42.
  • the fibrous material 42 may comprise fibres such as glass fibres provided in non-crimp fabrics or chopped strand mats or woven fabrics for example. Additional materials such as reinforcing fibres may be arranged in the mould 34 in some examples to form longitudinally-extending reinforcing structures that are embedded in the laminate structure of the shell 20.
  • the fibrous material 42 is so-called pre-preg material, which is fibrous material that is pre-impregnated with resin prior to being arranged in the mould 34.
  • the materials arranged in the mould 34 may comprise dry fibrous material 42.
  • the layup 38 may be infused with resin, for example in a vacuum- assisted resin transfer moulding (VARTM) process.
  • VARTM vacuum- assisted resin transfer moulding
  • Figure 2 shows a mould 34 configured to form the leeward side of the shell 22b
  • the same process may be followed to form the windward side of the shell 22a, and this is not repeated herein for conciseness.
  • the half shells 24a, 24b may be joined together in a join-up process to form the complete aerodynamic outer shell 20.
  • the join-up process typically involves arranging the half shells 24a, 24b one on top of the other, as shown in Figures 3, 4 and 6 for example.
  • the windward half shell 24a may be arranged on top of the leeward half shell 24b and the two shells may be bonded together with adhesive applied along the leading and trailing edges 16, 18.
  • each shear web 26 is arranged between the half shells 24a, 24b and connected between respective inner surfaces 32a, 32b as will now be described in more detail with reference to the remaining figures.
  • the web panel 28 of each shear web 26 in this example is oriented substantially vertically when the blade 10 is supported in the mould 34.
  • the vertically-oriented web panels 28 of each shear web 26 extend between respective pairs of upper and lower flanges 30a, 30b which are substantially the same width.
  • the flanges 30a and 30b are substantially vertically aligned, i.e.
  • edges 44a of the upper web flanges 30a are directly above the corresponding edges 44b of the lower web flanges 30b.
  • the shear webs 26 are typically arranged with one of the half shells 24 first before the half shells 24 are arranged together to form the complete outer shell 20.
  • Adhesive 46 is arranged such that the upper and lower flanges 30a, 30b of the shear webs 26 are respectively connected to the upper and lower sides 22a, 22b of the shell 20 by adhesive 46 when the half shells 24a, 24b are arranged on top of one another to complete the outer shell 20.
  • excess adhesive 46 may be squeezed out from the regions between the flanges 30a, 30b and the shell 20.
  • excess adhesive 46 squeezed from between the upper web flange 30a and the upper side of the shell 22a may fall under gravity and collect on or near to the lower web flange 30b.
  • surplus adhesive collecting on or too near to the lower flange 32b can interfere with non-destructive testing signals, such as ultrasonic signals, resulting in poor or unreliable testing data.
  • Excess adhesive 46 can make inspection of joints between the shell 20 and both the trailing edge and main shear webs 26a, 26b challenging.
  • non-destructive testing from outside of the blade 10 is relied on more heavily for inspection of the trailing edge web joints due to access constraints, whereas it may be possible to visually inspect the main shear web joints from within the shell 20.
  • the shear webs 26 of the blades 10 shown by way of example in the remaining figures are configured to mitigate the issues related to excess adhesive 46 squeezing out from the regions between the flanges 30a, 30b of the shear webs 26 and the outer shell 20 of the blade 10.
  • the trailing edge shear web 26a is arranged such that the upper web flange 30a overhangs the lower web flange 30b.
  • the flanges 30a, 30b are connected at their respective proximal edges 48a, 48b to the web panel 28 and extend in a generally chordwise direction (C) to a distal edge 44a, 44b which is the edge of the flange 30 furthest from the web panel 28.
  • the distal edge 44a of the upper flange 30a extends beyond the distal edge 44b of the lower flange 30b in the chordwise direction (C) when the blade 10 is supported in the mould 34.
  • the overhang of the upper web flange 30a results from the configuration of the web flanges 30a, 30b whilst the shear web panel 28 may be oriented substantially vertically.
  • the upper flange 30a of the web 26a may be wider than the lower web flange 30b. With the blade 10 supported in the mould, the upper flange 30a may therefore extend further from the shear web panel 28 in a generally chordwise direction (C) than the lower flange 30b.
  • the distal edge 44a of the upper flange 30a may extend beyond the distal edge 44b of the lower flange 30b in the chordwise direction (C) when the blade 10 is supported in the mould 34, i.e. the distal edges 44a, 44b of the upper and lower flanges 30a, 30b are not vertically aligned.
  • Excess adhesive 46 squeezed out during bonding of the upper web flange 30a to the upper side 22a of the outer shell 20 does not fall and collect on the lower web flange 30b because of the overhanging upper flange 30a. Such adhesive 46 instead falls and collects on the inner surface 32b of the lower half shell 24b.
  • the widths of the upper and lower web flanges 30a, 30b are configured such that any surplus adhesive 46 falling onto the shell 24b lands sufficiently far away from the distal edge 44b of the lower web flange 30b.
  • the web flanges 30a, 30b are preferably configured such that the upper flange 30a extends at least 12.5 mm, preferably at least 25 mm, beyond the distal edge 44b of the lower flange 30b in the chordwise direction (C).
  • Such an overhang helps to ensure that any surplus adhesive 46 lands far enough away from the distal edge 44b of the flange 30b that the non-destructive testing apparatus can accurately determine the edge 44b of the flange 30b and produce a clear image of the joint between the shear web 26 and shell 20.
  • the outer shell 20 of the blade 10 may be reinforced to take up loads experienced by the blade 10 in use and improve the structural rigidity of the blade 10.
  • the upper and lower sides 22a, 22b of the shell 20 may optionally comprise longitudinally-extending reinforcing structures 50a, 50b, as shown in Figure 5.
  • the shell 20 may be configured with longitudinally extending thickened portions to provide additional structural support to the blade 10.
  • the reinforcing structures 50 may comprise additional reinforcing components such as spar caps or stringers.
  • the reinforcing structures 50 are preferably embedded within the shell laminate 20 as shown in Figure 5, although in other examples the reinforcing structures 50 may be joined to the inner surfaces 32a, 32b of the shell 20.
  • the reinforcing structures 50 may be formed of fibre- reinforced polymer, such as carbon fibre in preferred examples.
  • the reinforcing structures 50 may be formed of a stack of carbon fibre reinforced polymer pultrusions in some examples.
  • the reinforcing structures 50a, 50b of the upper and lower sides of the shell 22a, 22b may be substantially the same width. Further, the reinforcing structures 50a, 50b may be symmetrically arranged, i.e. the reinforcing structures may be substantially vertically aligned. As such, in preferred examples, the reinforcing structure 50a of the upper side of the shell 22a does not substantially overhang the reinforcing structure 50b of the lower side of the shell 22b when the blade 10 is supported in the mould 34.
  • the upper web flange 30a is connected to the reinforcing structure 50a of the upper side 22a of the shell 20 if the blade 10 comprises such a reinforcing structure 50a.
  • the lower side 22b of the shell 20 comprises a reinforcing structure 50b
  • the lower web flange 30b is preferably connected to this reinforcing structure 50b.
  • the shear web 26 and reinforcing structures 50a, 50b may together form a longitudinally-extending reinforcing spar.
  • the blade 10 shown in the example of Figure 5 optionally comprises reinforcing structures 50, such reinforcing structures may not be included in other examples.
  • the upper and lower web flanges 30a, 30b may simply be connected to upper and lower sides 22a, 22b of the shell laminate 20.
  • Figures 6 and 7 show a further example of the blade 10 supported in a mould 34 and comprising a shear web 26 arranged such that the upper web flange 30a overhangs the lower web flange 30b.
  • the shear web 26 may be rotated in order to offset the upper and lower flanges 30a, 30b and create the required overhang X.
  • the web panel 28 may be non-vertical when the wind turbine blade 10 is supported in the blade mould 34.
  • the shear web panel 28 may be inclined relative to a vertical axis V at an angle a> which is preferably in the range of 1 degree to 20 degrees.
  • the shear web panel 28 may be inclined relative to the vertical axis V at an angle a> in the range of 1 degree to 5 degrees.
  • the main shear web 26b may be arranged in a first plane Pi
  • the trailing edge web 26a may be arranged in a second plane P2 that is inclined relative to the first plane Pi, as shown in Figure 6 for example.
  • the upper and lower flanges 30a, 30b may be offset, i.e. not vertically aligned, despite being substantially the same width. As such, excess adhesive 46 squeezed out during bonding of the upper web flange 30a to the upper side 22a of the outer shell 20 does not fall and collect on the lower web flange 30b.
  • the flanges 30a, 30b may therefore be configured to provide the same surface area via which to bond the shear web 26 to the shell 20 as a symmetrical shear web such as that shown in Figure 3, whilst also negating the issues relating to excess squeezed adhesive 46 collecting on the lower flange 30b.
  • Figure 7 shows a trailing edge portion of the blade 10 comprising a rotated trailing edge shear web 26a in more detail.
  • the upper and lower flanges 30a, 30b may extend from the web panel 28 at different angles. For example, a first angle a defined between the web panel 28 and the upper web flange 30a may be greater than a second angle /3 defined between the web panel 28 and the lower web flange 30b. As such, the upper and lower flanges 30a, 30b may be substantially parallel to the corresponding inner surface 32a, 32b of the upper or lower side 22a, 22b of the shell 20, despite the shear web 26a being rotated.
  • the first angle a is at least 5 degrees greater than the second angle /3. This helps to ensure that when the upper and lower flanges 30a, 30b are bonded to the upper and lower sides 22a, 22b of the shell 20, the flanges 30 are sufficiently offset in the chordwise direction (C) that adhesive squeezed from the joint with the upper side 22a does not land on the lower flange 30b.
  • the shear web 26 is rotated such that the upper flange 30a extends at least 12.5 mm, preferably at least 25 mm, beyond the distal edge 44b of the lower flange 30b in the chordwise direction (C) as described above with reference to the example of Figure 4.
  • the upper flange 30a is connected to the upper side 22a of the outer shell 20, and the lower flange 30b is connected to the lower side 22b.
  • the flanges 30a, 30b may be bonded to the respective upper and lower sides 22a, 22b of the shell 20 by adhesive 46.
  • the shell 20 comprises reinforcing structures 50a and/or 50b, such as spar caps or stringers
  • the upper and lower flanges 30a, 30b are preferably connected to such reinforcing structures 50a, 50b as previously described.
  • the wind turbine blades 10 comprise shear webs 26 having asymmetrically arranged upper and lower web flanges 30a, 30b.
  • the upper web flange 30a overhangs the lower web flange 30b when the blade 10 is supported in the mould 34.
  • the flanges 30a, 30b are therefore not vertically aligned, and adhesive 46 squeezed out from between the upper flange 30a and the upper side 22a of the shell 20 does not land and collect on or too near to the lower flange 30b.
  • the asymmetrically arranged flanges 30a, 30b therefore facilitate improvements in the accuracy and reliability of non-destructive testing of the blade 10 due to the absence of surplus adhesive 46 collecting on or too near to the lower flange 30b.
  • the blade 10 supported in the mould 34 may comprise a shear web 26 having both a web panel 28 that is inclined relative to a vertical axis V, and an upper web flange 30a that is wider than the lower web flange 30b.
  • one or more of the webs 26 may be l-shaped in cross section, comprising upper and lower flanges 30a, 30b extending on both a first and second side of the web panel 28. Any references herein to an upper or lower flange 30a, 30b will be understood to relate to upper and lower flanges 30a, 30b on the same side of the shear web 26 in such an example.
  • the description provided herein with reference to the trailing edge web 26a as an example is equally applicable to features of the main shear web 26b.
  • the main shear web 26b and/or trailing edge shear web 26a may comprise an inclined web panel 28, wider upper web flange 30a or any other combination of features described herein.

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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

Selon un premier aspect, l'invention concerne un ensemble comprenant une pale d'éolienne supportée dans un moulage de pale. La pale d'éolienne comprend une coque externe aérodynamique ayant un côté supérieur et un côté inférieur. La pale comprend en outre une bande de cisaillement comprenant un panneau de bande, une bride de bande supérieure et une bride de bande inférieure. Le panneau de bande s'étend entre la bride de bande supérieure et la bride de bande inférieure. La bride de bande supérieure est reliée au côté supérieur de la coque externe et la bride de bande inférieure est reliée au côté inférieur de la coque externe. Les brides de bande supérieure et inférieure sont agencées de manière asymétrique de telle sorte que, lorsque la pale d'éolienne est supportée dans le moulage de pale, la bride de bande supérieure surplombe la bride de bande inférieure.
PCT/DK2021/050281 2020-09-15 2021-09-14 Pale d'éolienne WO2022057988A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA202070591 2020-09-15
DKPA202070591 2020-09-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110176928A1 (en) * 2008-06-23 2011-07-21 Jensen Find Moelholt Wind turbine blade with angled girders
DK201670994A1 (en) * 2016-12-15 2018-07-13 Vestas Wind Systems A/S IMPROVEMENTS RELATING TO THE MANUFACTURE OF WIND TURBINE BLADES
US10487797B2 (en) * 2011-12-16 2019-11-26 Vestas Wind Systems A/S Wind turbine blades

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110176928A1 (en) * 2008-06-23 2011-07-21 Jensen Find Moelholt Wind turbine blade with angled girders
US10487797B2 (en) * 2011-12-16 2019-11-26 Vestas Wind Systems A/S Wind turbine blades
DK201670994A1 (en) * 2016-12-15 2018-07-13 Vestas Wind Systems A/S IMPROVEMENTS RELATING TO THE MANUFACTURE OF WIND TURBINE BLADES

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