GB2523414A - Turbine blade and method of manufacture - Google Patents

Turbine blade and method of manufacture Download PDF

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Publication number
GB2523414A
GB2523414A GB1407911.5A GB201407911A GB2523414A GB 2523414 A GB2523414 A GB 2523414A GB 201407911 A GB201407911 A GB 201407911A GB 2523414 A GB2523414 A GB 2523414A
Authority
GB
United Kingdom
Prior art keywords
foam
spar
shell
blade
shells
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.)
Granted
Application number
GB1407911.5A
Other versions
GB2523414B (en
GB201407911D0 (en
Inventor
Raul Cacho-Oses
Jacobus Klaassen
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.)
Marine Current Turbines Ltd
Original Assignee
Marine Current Turbines 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 Marine Current Turbines Ltd filed Critical Marine Current Turbines Ltd
Priority to GB1407911.5A priority Critical patent/GB2523414B/en
Publication of GB201407911D0 publication Critical patent/GB201407911D0/en
Priority to PCT/EP2015/053696 priority patent/WO2015124761A1/en
Publication of GB2523414A publication Critical patent/GB2523414A/en
Application granted granted Critical
Publication of GB2523414B publication Critical patent/GB2523414B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/121—Blades, their form or construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/18—Filling preformed cavities
    • 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
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
    • F03B13/264—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy using the horizontal flow of water resulting from tide movement
    • 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
    • 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
    • Y02E10/20—Hydro energy
    • 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
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
    • 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

Abstract

A turbine blade 1 for a water current e.g. tidal turbine or a wind turbine is manufactured by shaping and curing first and second blade shells 2, 3. A spar 7, 8 is installed in the first shell 2, and the internal volume of the blade is partially filled with foam sheets 9. A volume of a foam forming substance is provided in voids 12 between the foam sheets or the spar and an inner surface of the shells before fitting the second shell 3 to the first shell 2 to enclose the spar and foam sheets and the assembled blade is cured. This method ensures that the blade is fully filled with foam, but without the need to machine the foam sheets to the precise shape of the blade cavity.

Description

TURBINE BLADE AND METHOD OF MANUFACTURE
This invention relates to a method of manufacturing a turbine blade and a blade so manufactured, in particular for use in water current turbines. However, the invention may also be applied to wind turbines.
Both wind and water current turbine blades are typically manufactured as two shells which are joined together. For water current turbine blades, the shells are also provided with some sort of filling to give support against the pressure of the water.
Generally, wind turbine blades are hollow. However, with a filled blade, it can be difficult to close the two shells to form a complete foam filled blade, without creating gaps, or large voids between the foam and inner blade shell surfaces/skins. The inner blade surfaces/skins are not in contact with the mould surfaces, the mould surface only interfaces with the outer blade surface, so the inner blade surface is subject to larger variation than the outer blade surface. Thus, larger tolerances between the foam filling and the inner blade surfaces/skin are needed to avoid crushing where there is too much filling material or voids where there is too little filling material.
GB2460021 describes a blade for an underwater turbine in which foam material is placed in a void formed between two skins. The blade may also have bulkheads and a means by which the blade can be flooded or drained. Using this type of flooded blade in underwater turbines exposes other blade components to salt water, which can be corrosive, or allows build up of marine organisms, so a blade construction which keeps out the sea water is preferable.
GB247 103 describes a blade for an underwater turbine made as a hollow spar within outer skins and with a plurality of spaced apart foam ribs within the skins to prevent the spar from deforming under changes in external pressure. In this type of blade, only a small part of the blade, in the root region, is filled with water to prevent fatigue in that region. This reduces the effects of moving water within the blade, but still has issues with regard to corrosion or marine organism build up, albeit on a smaller scale.
An alternative is to make blades which are filled with foam cut from one or more solid blocks, as in the case with the mdders of some boats. However, a blade filled with cut foam is expensive to manufacture and requires lot of rework in the workshop to accommodate machined foam blocks in the internal shape of the blade shell that meets all manufacturing tolerances, Integrating the machined foam blocks with the shells of the blade using resins, or adhesives may then cause the blade to fall outside acceptable manufacturing tolerances.
In accordance with a first aspect of the present invention, a method of manufacturing a turbine blade comprises shaping first and second blade shells and curing the shells; installing a spar in the first shell; partially filling a volume, defined by the first and second shells and the spar, with foam sheets; providing a volume of a foam forming substance in voids formed between the foam sheets or the spar and an inner surface of the shells; fitting the second shell to the first shell to enclose the spar and foam sheets; and curing the assembled blade.
Preferably, the foam forming substance is at least partially in contact with some of the foam sheets and the spar before fitting the second shell to the first shell, after the second shell has been fitted.
Preferably, the foam forming substance expands into the voids formed between the foam sheets or the spar and an inner surface of the second shell, Preferably, the curing of the assembled blade hardens the foam formed by the expansion of the foam forming substance.
Preferably, the method comprises determining a total volume of voids within the shells after inserting the spar and foam sheets; calculating a volume of foam forming substance required for that volume of voids; and supplying that volume of foam forming substance into the voids in the first shell, In accordance with a second aspect of the present invention, a turbine blade comprises first and second blade shells sealed on their leading and trailing edges and containing a longitudinally extending spar, a plurality of foam sheets at least some of which are in contact with the spar, and foam filling formed in situ within the shells in voids around the foam sheets and spar from a foam forming material in accordance with a method according to the first aspect, An example of a turbine blade and a method of manufacturing a turbine blade according to the present invention will now be described with reference to the accompanying drawings in which: Figure 1 shows a cross-section through an example of a foam filled turbine blade according to the present invention, with foam sheets oriented in the chord-wise direction; Figure 2 illustrates standard rectangular foam sheets for use in constructing the turbine blade of the present invention; Figure 3 is a cross-section through part of an example of a foam filled turbine blade constmcted according to the present invention, with foam sheets oriented in a span-wise direction; Figure 4 is a cross-section through part of an example of a foam filled turbine blade according to the present invention, with foam sheets oriented in the chord-wise direction; Figure 5 is a top view of an example of a turbine blade constructed according to the present invention, with foam sheets oriented in a span-wise direction; and, Figures 6a to 6c illustrate an example of a method of manufacturing a foam filled turbine blade according to the present invention.
An example of a turbine blade 1 according to the present invention is illustrated in Fig 1, showing a cross-section through a foam filled blade. A turbine blade formed with a sealed shell which does not flood is typically formed by combining two outer shells, bonding these to a spar and sealing the edges of the shell halves together. The use of a filling gives the blade skins buckling resistance, avoids internal flooding and provides shear strength to counter the pressure loads, which are particularly problematic in an underwater environment. In this example, the blade comprises two outer shells or skins 2, 3 which have been formed in moulds, An outer surface 4 of the shells, the mould surface, was in contact th the mould surface during manufacture of the shell and so has a well defined surface shape. An inner surface 11 of each shell has a less well defined surface shape. At a leading edgeS and trailing edge 6 of each shell, adhesive 10 is used to bond the two shells together, Between the shells 2, 3 a spar 7, or other structural member, which may be in the form of a box beam with a void 13, an open framework, in which case the void 13 may also be filled with foam, or another suitable construction, runs along the length of the blade 1. A spar cap 8a, 8b is positioned between the structural member 7 and an inner surface 11 of the shell 2, 3.
Layers of foam sheets 9, or other low density material, as shown in Fig.2, are fitted around the spar 7. In the example of Fig. 1, the foam sheets are oriented in the chord-wise direction, In voids formed between the foam sheets, spar and shell inner surface, a foam forming material, such as foaming epoxy, is provided, As discussed above, conventionally, a lot of extra work is required in order to machine the foam to fit the inner surface of the shells correctly. The present invention overcomes this problem by using standard sheets of foam, as shown in Fig.2, manufactured to approximately fill the volume between the spar and the shell inner surface and then using a foam forming substance to fill the remaining gaps. The sheets of foam may either be loose within the shells, or grouped together prior to fitting and then inserted into the shell to fit the void of the blade with a small margin clear around the edges. This means that there is no likelihood of crushing when the shells are joined over the foam filling. In some parts there may be larger gaps due to the straight foam edges not exactly following the curved contour of the blade.
The present invention uses a foam forming substance to fill the voids with foam without there being excess material that needs to be removed, or which causes crushing and distortion of the blade surface, The presence of excess material in a closed space tends to lead to damage to the turbine shell shape, as the excess cannot simply be wiped off as may be done with the adhesive along the leading and trailing edges of wind turbine blades where they join. The foam forming substance expands as much as is needed to fill the gaps, which may be up to 6 times the original volume, For best results, it is preferred that the gaps left between the foam sheets and the inner surface of the shell do not exceed 300mm at any point. The combination of foam sheeting and foam forming substance enables complete foam filled regions of the blade to be formed, without concerns about tight tolerances in the foam and/or the need to carry out multi-axis CNC milling of foam blocks, An approximation of the volume of remaining voids may be used to determine the volume to be filled by the foam forming substance and hence the amount of the foam forming mixture required.
Fig,3 shows in more detail part of the trailing edge section 6 of the blade I with span-wise arranged foam sheets 9, In voids between the inner surface 11 of the shells 2, 3 and the foam sheets 9, foam forming substance 12 is applied to create a foam filling. Fig,4 shows a cross-section through the same portion of the trailing edge 6, but using foam sheets 9 oriented in the chord-wise direction, with a foam forming substance 12 to create the foam filling in the voids. Fig.5 is a top view of the blade 1, with the foam sheets 9 oriented in the span-wise direction, as in Fig.3. The structural supporting spar 7 can be seen with foam sheets on either side and voids 14 formed where the foam sheets do not follow the curvature of the shell 2, An example of a method of manufacturing a blade according to the present invention will be described in more detail with reference to Figs.6a to 6c. As shown in Fig.6a, one shell half 2 is formed and cured and laid with its inner surface 3 facing upwards to receive the spar 7. In this example a spar cap 8 fixes the position of the spar in the shell half The spar cap 8 may have a layer of adhesive 15 applied between it and the inner surface of the shell half 2 where the spar is to be positioned, and adhesive 17 may be applied to a surface of the spar before it is inserted onto the spar cap.
A second shell half 3 shown in Fig.6b is also formed and cured, ready to assemble with the first shell half 2. As can be seen in Fig.6c, the required number of sheets of foam 9 are positioned around, over and under the spar, as required and then a foam forming substance 12 is poured into at least part of the first shell half 2, around the spar 7 and sheets of foam 9. The sheets of foam may have a span-wise or chord-wise orientation in the shells. Further foam forming substance is poured over the spar and sheets of foam, as required, before the second shell half 5 is lowered into place and into contact with the first shell half 2 and the spar 7 and the construction so formed is then cured.
Before joining the shell halves 2, 5 any of those surfaces of the first shell half 2 and the spar 7 which will contact the second shell half S may be coated with adhesive 16 to assist in the process of bonding the spar to the skin. Adhesive 10 may be applied to the trailing edge 6 and leading edge 5 of the first shell half 2, as well as over the spar 7, and the edges are then sealed, If preferred, the adhesive may be applied to the inner surface of the second shell half instead. Generally, the shell halves remain in their mould before assembly because the mould is used to apply heat for curing and maintain both shells aligned in the assembly process. The alignment of one shell half with the other shell half is then provided by the mould alignment system.
The effect of the curing step is to harden the adhesive, thereby sealing the two shell halves together and also to cure the foam forming substance 8, The foam forming process is typically a chemical reaction initiated by adding a foaming agent to a base substance and mixing this before pouring the mixed foam forming substance 12 into the first shell half and bringing the two shell halves 2, 3 together. The mixing step immediately sets off an exothermic reaction and the mixture is poured into the shell half 2 and over the foam sheets and spar which will be covered by the other shell half, The exothermic reaction is allowed to stabilize. The foaming process continues afier the shells 2, 3 have been closed until the process has finished and the foam has expanded to fill the voids 14 around the spar and foam sheets and with the inner surface of the shells. Once completed, energy may be applied to cure the foam forming substance and the structural adhesive.
The present invention provides a blade that is substantially completely filled, either with foam sheets 9, or with foam 12 which has formed in the shells 2, 3 to fill any voids 14 between the foam sheets, the spar and the inner surface of the shells. This combination of standard foam sheets 9 and foam forming material 12 avoids the need for any machining process for the foam filling, or other manual process to fill the internal volume of the blade, yet uses a relatively small amount of foam forming substance to complete a construction which is otherwise made from standard foam sheets. The resulting blade has sufficient structural support from the combination of foam sheets, foam forming substance and the spar 7 to resist the forces applied by the water in use, without exposing the inner part of the blade to seawater.

Claims (6)

  1. CLAIMSL A method of manufacturing a turbine blade, the method comprising shaping first and second blade shells and curing the shells; installing a spar in the first shell; partially filling a volume, defined by the first and second shells and the spar, with foam sheets; providing a volume of a foam forming substance in voids formed between the foam sheets or the spar and an inner surface of the shells; fitting the second shell to the first shell to enclose the spar and foam sheets; and curing the assembled blade.
  2. 2. A method according to claim 1, wherein the foam forming substance is at least partially in contact with some of the foam sheets and the spar before fitting the second shell to the first shell, after the second shell has been fitted.
  3. 3. A method according to claim 1 or claim 2, wherein the foam forming substance expands into the voids formed between the foam sheets or the spar and an inner surface of the second shell.
  4. 4. A method according to claim 3, wherein the curing of the assembled blade hardens the foam formed by the expansion of the foam forming substance.
  5. 5. A method according to claim 3 or claim 4, wherein the method comprises determining a total volume of voids within the shells after inserting the spar and foam sheets; calculating a volume of foam forming substance required for that volume of voids; and supplying that volume of foam forming substance into the voids in the first shell.
  6. 6. A turbine blade comprising first and second blade shells sealed on their leading and trailing edges and containing a longitudinally extending spar, a plurality of foam sheets at least some of which are in contact with the spar, and foam filling formed in situ within the shells in voids around the foam sheets and spar from a foam forming material in accordance with a method according to any preceding claim.Amendment to the claims have been filed as followsCLAIMSL A method of manufacturing a turbine blade, the method comprising shaping first and second blade shells and curing the shells; installing a spar in the first shell; partially filling a volume, defined by the first and second shells and the spar, with foam sheets; providing a volume of a foam forming substance in voids formed between the foam sheets or the spar and an inner surface of the shells; fitting the second shell to the first shell to enclose the spar and foam sheets; and curing the assembled blade.2. A method according to claim 1, wherein the foam forming substance is at least partially in contact with some of the foam sheets and the spar before fitting the second shell to the first shell.3. A method according to claim 1 or claim 2, wherein the foam forming substance LI') 15 expands into the voids formed between the foam sheets or the spar and an inner surface of the second shell. (04. A method according to claim 3, wherein the curing of the assembled blade hardens the foam formed by the expansion of the foam forming substance.5. A method according to claim 3 or claim 4, wherein the method comprises determining a total volume of voids within the shells after inserting the spar and foam sheets; calculating a volume of foam forming substance required for that volume of voids; and supplying that volume of foam forming substance into the voids in the first shell.6. A turbine blade comprising first and second blade shells sealed on their leading and trailing edges and containing a longitudinally extending spar, a plurality of foam sheets at least some of which are in contact with the spar, and foam filling formed in situ within the shells in voids around the foam sheets and spar from a foam forming material in accordance with a method according to any preceding claim.
GB1407911.5A 2014-02-24 2014-02-24 Turbine blade and method of manufacture Expired - Fee Related GB2523414B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1407911.5A GB2523414B (en) 2014-02-24 2014-02-24 Turbine blade and method of manufacture
PCT/EP2015/053696 WO2015124761A1 (en) 2014-02-24 2015-02-23 Foam-filled turbine blade and method of manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1407911.5A GB2523414B (en) 2014-02-24 2014-02-24 Turbine blade and method of manufacture
GB1403152.0A GB2523370B (en) 2014-02-24 2014-02-24 Blade manufacturing method

Publications (3)

Publication Number Publication Date
GB201407911D0 GB201407911D0 (en) 2014-06-18
GB2523414A true GB2523414A (en) 2015-08-26
GB2523414B GB2523414B (en) 2016-02-17

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GB1407911.5A Expired - Fee Related GB2523414B (en) 2014-02-24 2014-02-24 Turbine blade and method of manufacture
GB1403152.0A Expired - Fee Related GB2523370B (en) 2014-02-24 2014-02-24 Blade manufacturing method

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Application Number Title Priority Date Filing Date
GB1403152.0A Expired - Fee Related GB2523370B (en) 2014-02-24 2014-02-24 Blade manufacturing method

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WO (1) WO2015124761A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111561419A (en) * 2020-06-11 2020-08-21 国电联合动力技术(保定)有限公司 Design method for filling core material at rear edge of wind power blade

Citations (2)

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NL9100816A (en) * 1991-05-10 1992-12-01 Aerpac Holding B V Hollow plastic structure-reinforcement method - by joining sections by inflating and hardening adhesive auxiliary plastic structure
US20110031759A1 (en) * 2009-08-05 2011-02-10 Nitto Denko Corporation Foam filling material for wind power generator blades, foam filling member for wind power generator blades, wind power generator blade, wind power generator, and method for producing the wind power generator blade

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Publication number Priority date Publication date Assignee Title
DE1059770B (en) * 1957-01-23 1959-06-18 Rhein West Flug Fischer & Comp Process for the production of aircraft wings and tail surfaces
FR2617119B1 (en) * 1987-06-26 1989-12-01 Aerospatiale BLADE OF COMPOSITE MATERIALS, WITH STRUCTURAL CORE AND PROFILED COVERING COVERING, AND MANUFACTURING METHOD THEREOF
DK171333B1 (en) * 1992-11-05 1996-09-09 Bonus Energy As Wind turbine blade
US7732044B2 (en) * 2002-09-04 2010-06-08 Foam Matrix, Inc. Foam core-surface reinforced article and method
US9512818B2 (en) * 2012-01-18 2016-12-06 Pika Energy LLC Low-cost molded wind turbine blade

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
NL9100816A (en) * 1991-05-10 1992-12-01 Aerpac Holding B V Hollow plastic structure-reinforcement method - by joining sections by inflating and hardening adhesive auxiliary plastic structure
US20110031759A1 (en) * 2009-08-05 2011-02-10 Nitto Denko Corporation Foam filling material for wind power generator blades, foam filling member for wind power generator blades, wind power generator blade, wind power generator, and method for producing the wind power generator blade

Also Published As

Publication number Publication date
GB2523370A (en) 2015-08-26
GB2523414B (en) 2016-02-17
GB201403152D0 (en) 2014-04-09
GB2523370B (en) 2016-08-10
GB201407911D0 (en) 2014-06-18
WO2015124761A1 (en) 2015-08-27

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Effective date: 20180224