GB2479875A - Corrugated internal structural body component for an airfoil, eg a wind turbine blade - Google Patents

Corrugated internal structural body component for an airfoil, eg a wind turbine blade Download PDF

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Publication number
GB2479875A
GB2479875A GB1006960A GB201006960A GB2479875A GB 2479875 A GB2479875 A GB 2479875A GB 1006960 A GB1006960 A GB 1006960A GB 201006960 A GB201006960 A GB 201006960A GB 2479875 A GB2479875 A GB 2479875A
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GB
United Kingdom
Prior art keywords
iso
grid
shape
airfoil
structural
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.)
Withdrawn
Application number
GB1006960A
Other versions
GB201006960D0 (en
Inventor
Warren Barratt Leigh
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1006960A priority Critical patent/GB2479875A/en
Publication of GB201006960D0 publication Critical patent/GB201006960D0/en
Publication of GB2479875A publication Critical patent/GB2479875A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • 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
    • F05B2250/00—Geometry
    • F05B2250/60—Structure; Surface texture
    • F05B2250/61—Structure; Surface texture corrugated
    • 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
    • Y02E10/721—
    • 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
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the 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

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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

A lightweight, stiff and strong iso-grid (corrugated) shaped component 2 forms the internal structural body within a structural sheath (14, fig.3) of an airfoil, eg wind turbine blade. The iso-grid component 2 may be formed from upper and lower skins 9,10 forming pockets 11. The iso-grid 2 maybe extruded externally at the base of the blade or airfoil so that it can form a circular or part circular closed attachment hub. The iso-grid 2 can be manufactured from a variety of isotropic, or quasi-isotropic or orthotropic materials such as metals or composites, eg 3D composite weave material. The final shape can be adjusted to suit the design by cutting the continuous 3D weave material at the appropriate length and shape to fit within the blade airfoil geometry. The iso-grid internal structure maybe bonded to its mating aerodynamic shape outer sleeve (14) by a suitable matrix material. The iso-grid may be applied wing tip to wing tip either on the inside of the pressure surface or the suction surface of an airfoil, thus providing unbroken structural continuity on at least one face.

Description

Background.
Wind turbines offer a means of converting wind energy to electrical energy. The initial energy conversion takes place through the blades resulting from the wind velocity impact on the blades providing momentum resulting in a revolving motion of the blade system around a horizontal or vertical axis.
The wind turbine blades must be capable of sufficient strength to resist breaking due to centrifugal loads and wind bending loads. The blades must be of low weight to minimize centrifugal loads and the effect on the supporting structure and relatively high stiffness so that undesirable blade deflections are avoided or minimized.
Summary of Invention.
The objective of the invention is to provide a structural internal component (Iso-grid) as part of an airfoil or a wind turbine blade, that offers a low weight designable stiffness and strength. The iso-grid can be manufactured from a variety of materials, preferably composite 3D-weave material using automated manufacturing methods. The iso-grid is then cut to length and if necessary individual adjacent runs of iso-grid cut at length to suit the aerodynamic profile. The iso-grid placed within an outer skin, much like an envelope which can be airfoil shape. The outerskin may also be a structural composite material so that the two structural items can be fastened and or bonded together to form an integral structural blade or airfoil component.
Detailed description of the Drawings.
1. Hub.
This is the region which is formed from an extended iso-grid and has been cut to a profile shape resulting in a circular-section or some other suitable shape such as a Fish Tail plate so that the wind turbine may be connected to a rotating device.
2. Iso-grid.
This is the material which has been formed to a corrugated shape. A 3D composite material weave is suitable for this invention.
3. Trimmed length.
The iso-grid material is cut to the required (Trimmed) length based on structural, aerodynamic, manufacturing or performance influences as required.
4. Tip.
Tip of the wind turbine blade or airfoil.
5. Spine.
The wind turbine blade or airfoil's structural spine is formed by the iso-grid centre corrugated section which extends towards the tip (t) and provides structural spinal strength and stiffness to the connecting airfoil shape and to the complete product.
6. The bond or stitched line.
This is the longitudinal position along which the corrugated iso-grid is stitched or bonded.
7. Iso-Pitch.
The distance between the stitched or bonded lines defines the iso-grid pitch.
8. Tubes Aspect ratio.
Defines the iso-grid's tube's aspect ratio which may be equal so that the dimension 8a = dimension 8b resulting in a circular section or 8a not equal 8b resulting in a non-circulare section.
9. Upper skin of the iso-grid.
10. Lower skin of the iso-grid.
11. Iso-grid pocket.
Formed and may remain hollow of filled for a required or designed length.
12. Fastening holes.
Structural sized fastener holes.
13. Fish tail hub.
Connection feature.
14. Airfoil Sheath.
This is the outer aerodynamic surface material which is stitched or co-bonded to the iso-grid during manufacture of the airfoil structure. This outer surface material maybe a sleeve type structure, to which the iso-grid is inserted, or the sleeve may be formed by an upper and lower surface material bonded along the peripheral mating edges, or formed by an overwrapped sheet onto the iso-grid and bonded at suitable locations..
15. Stitch/Bond Line.
Outerskin to Inner Isogrid stitch/bond line.
16. Leading edge (LE) wall This is a composite Leading edge (LE) wall which may be an inherent part of the upper and/or lower skin.
17. Trailing edge (TE) wall.
This is a composite Trailing edge (TE) wall which may be an inherent part of the upper and/or lower skin.

Claims (8)

  1. Claims.1. The Iso-grid is a corrugated (ribbed) sheet form Fig.1 (2) made from any material with isotropic, orthotropic, anisotropic or composite properties, indeed any material that offers structural stiffness and strength and is encased within a structural sleeve of thin sheet skin material (14), made from any material with isotropic, orthotropic, anisotropic or composite properties, and the Iso-Grid (Fig.1) forms the interior shape and behaves in a structural manner, and the combined Iso-grid (2) within its sleeve (14), is shaped to form the aerodynamic profile form of the wind turbine blade or wing profile (Fig.2), whereas, the Iso-grid (2) is a male component part formed from either one or many parts and is placed within the female sleeve, so that the iso-grid material is cut to its required trimmed length.
    Fig.1 (4), and that the iso-grid material is cut appropriately to its desired shape at the intended hub-end of the blade, so that its shape forms the hub-component (1) by the joining of the upper iso-grid skin (9) to the lower iso-grid skin (10), and the upper (9) and lower (10) iso-grid skins that form the hub component (1) may each be of semi-circular shape so that when the two halves are joined they form a circular section shape (1), which is a convenient shape to mate with a complimentary connection detail such as that which connects to a rotating feature, and the upper (9) and lower (10) iso-grid skins that proceed to form the hub connection detail may be shaped so that when upper and lower skins are combined by suitably joining, form a fishtail" shape Fig.3 (13), basically a flat feature flanged which could accommodate a number of bolt holes (12) to enable attachment to a connection component such as a that which connects to a rotating hub, and the iso-grid may be a 3D composite weave material such as carbonfibre or glass fibre with a suitable matrix material such as epoxy, vinyester or polyester etc, and circular profiling as is the form of the iso-grid extended region is suitable for a circular hub shape.Fig.1. (1)
  2. 2. With reference to claim 1, the isogrid (2) architecture is primarily a lightweight internal structural feature that supplies shape, form, stiffness, strength and structural integrity to the component.
  3. 3. With reference to claim 1, the Iso-grid (2) may structurally replace stringers or foam core items and is located within and is part of the structural blade or wing concept either for the partial length or throughout the length of the component.
  4. 4. With reference to claim 1, the iso-grid maybe a symmetric and shape so that the upper skin (9) rib-pitch is equal to the lower skin rib-pitch (10).
  5. 5. With reference to claim 1, the stitch line or bond line (6) of the 3D iso-grid or 3D-weave material enables empty pockets (11) of iso-grid to be formed along the iso-grid structure.
  6. 6. With reference to claim 1, the iso-grid pocket is defined in claim 1 above maybe formed to be circular or non-circular.
  7. 7. With reference to claim 1, the iso-grid in cross-section (Fig.4) may be designed so that the upper or lower skin could have a Leading edge (LE) or Trailing edge (TE) wall which may be an additional part or indeed an inherent part of the upper or lower skin, fastened during assembly or co-bonded or stitched in place.
  8. 8. With reference to claim 1, the iso-grid in cross-section, as shown in Fig.1 and Fig.2, where the upper and lower skin mate at the Leading and Trailing edge respectively. A Land area would be allowed for mutual contact bonding area for the upper and lower skins.
GB1006960A 2010-04-27 2010-04-27 Corrugated internal structural body component for an airfoil, eg a wind turbine blade Withdrawn GB2479875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1006960A GB2479875A (en) 2010-04-27 2010-04-27 Corrugated internal structural body component for an airfoil, eg a wind turbine blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1006960A GB2479875A (en) 2010-04-27 2010-04-27 Corrugated internal structural body component for an airfoil, eg a wind turbine blade

Publications (2)

Publication Number Publication Date
GB201006960D0 GB201006960D0 (en) 2010-06-09
GB2479875A true GB2479875A (en) 2011-11-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020169393A1 (en) * 2019-02-18 2020-08-27 Wobben Properties Gmbh Wind turbine component for a wind turbine tower, wind turbine tower, rotor blade, wind turbine and method for producing a wind turbine component

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB545090A (en) * 1940-11-22 1942-05-11 Boulton Aircraft Ltd Improvements in and relating to the forming of tubular or like members from impregnated fibrous material
US3095180A (en) * 1959-03-05 1963-06-25 Stalker Corp Blades for compressors, turbines and the like
EP0199914A2 (en) * 1985-04-27 1986-11-05 Dornier Gmbh Wing and tail surfaces structure for aircraft
US5129787A (en) * 1991-02-13 1992-07-14 United Technologies Corporation Lightweight propulsor blade with internal spars and rigid base members
US20020012587A1 (en) * 2000-07-27 2002-01-31 Farrar Peter G.G. Gas turbine engine blade
WO2009155921A1 (en) * 2008-06-23 2009-12-30 Danmarks Tekniske Universitet A wind turbine blade with angled girders
US20100009126A1 (en) * 2008-07-12 2010-01-14 The Boeing Company Method and Apparatus for Forming a Corrugated Web Having a Continuously Varying Shape

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB545090A (en) * 1940-11-22 1942-05-11 Boulton Aircraft Ltd Improvements in and relating to the forming of tubular or like members from impregnated fibrous material
US3095180A (en) * 1959-03-05 1963-06-25 Stalker Corp Blades for compressors, turbines and the like
EP0199914A2 (en) * 1985-04-27 1986-11-05 Dornier Gmbh Wing and tail surfaces structure for aircraft
US5129787A (en) * 1991-02-13 1992-07-14 United Technologies Corporation Lightweight propulsor blade with internal spars and rigid base members
US20020012587A1 (en) * 2000-07-27 2002-01-31 Farrar Peter G.G. Gas turbine engine blade
WO2009155921A1 (en) * 2008-06-23 2009-12-30 Danmarks Tekniske Universitet A wind turbine blade with angled girders
US20100009126A1 (en) * 2008-07-12 2010-01-14 The Boeing Company Method and Apparatus for Forming a Corrugated Web Having a Continuously Varying Shape

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020169393A1 (en) * 2019-02-18 2020-08-27 Wobben Properties Gmbh Wind turbine component for a wind turbine tower, wind turbine tower, rotor blade, wind turbine and method for producing a wind turbine component

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