EP2147210A2 - Pale pour turbines éoliennes présentant un axe de rotation vertical - Google Patents

Pale pour turbines éoliennes présentant un axe de rotation vertical

Info

Publication number
EP2147210A2
EP2147210A2 EP08758668A EP08758668A EP2147210A2 EP 2147210 A2 EP2147210 A2 EP 2147210A2 EP 08758668 A EP08758668 A EP 08758668A EP 08758668 A EP08758668 A EP 08758668A EP 2147210 A2 EP2147210 A2 EP 2147210A2
Authority
EP
European Patent Office
Prior art keywords
wing
vertical axis
section
blade
cross
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Withdrawn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
EP08758668A
Other languages
German (de)
English (en)
Inventor
Lucio Zancai
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.)
Ropatec Srl
Original Assignee
Ropatec Srl
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 Ropatec Srl filed Critical Ropatec Srl
Publication of EP2147210A2 publication Critical patent/EP2147210A2/fr
Withdrawn legal-status Critical Current

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
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • 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
    • 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
    • F05B2250/00—Geometry
    • F05B2250/10—Geometry two-dimensional
    • F05B2250/14—Geometry two-dimensional elliptical
    • 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
    • F05B2250/70—Shape
    • 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

Definitions

  • the wind turbines have a vertical axis of rotation, e.g. use of Darrieus type at least two spaced from the rotation axis wings; These wings can be straight, curved or in the shape of a helix. In general, these wings extend vertically straight, have rectangular more or less slender shape and have the cross-section of a wing.
  • the connection between the wings and the central hub consists of plates which are connected to the wing tips or of arms which are arranged like a spoke and in different ways, with or without the use of encompassing mounting brackets, are attached.
  • the support arms are usually two per wing, the one arm per wing systems are currently limited to wind generators of considerable dimensions.
  • the invention has as its object to provide a wing for wind turbines with vertical axis of rotation which, in relation to the weight and the
  • connection with the hub is favored by a single arm.
  • the invention proposes to provide the wing with a substantially elliptical outline with a straight or arrow-shaped arrangement, symmetrical according to a horizontal axis and possibly, in the case of a straight arrangement, also according to a vertical axis, wherein the cross section of the wing in the area is the largest of the horizontal axis of symmetry and decreases in the direction of both ends of the wing, top and bottom, such that a cross-section is formed in the region of the vertical axis elliptical shape or at least the maximum dimension in the horizontal axis and the minimum extent in the range the two ends has.
  • the elliptical outline of the wing allows the optimization of the aerodynamic and fluidodynamic efficiency and thus the Performance with a minimum of wing surface and therefore with a minimum of weight.
  • the section according to the vertical axis which has an elliptical or conical, symmetric or asymmetrical shape along the vertical axis makes it possible to achieve considerable stability of the wing shape with a sturdy mounting or connecting area for the support arm, this Area through the zone of the vertex or the apex of the curvature or conicity which substantially coincides with the area of the center of mass, possibly with the geometric center of the wing surface and the center of the aerodynamic and inertial loads acting on the wing, this area includes the intersection between the horizontal and the possible vertical axis of symmetry, or between the horizontal axis of symmetry and a substantial central line between the leading edge and the trailing edge of the wing, or between the horizontal axis of symmetry and the line which aerodynami connecting pressure centers; in the case of an elliptical wing
  • the section through the wing according to a vertical substantially central line or according to the possible vertical axis of symmetry, or in the case of an arrow-shaped wing according to a vertical axis which passes through the intersection of the lines through the printing centers, has an elliptical shape resulting from the curvature of the back and the abdominal surfaces, resulting in the creation of a resilient self-supporting and possibly reinforced wing structure in this area, which is provided for the efficient and stable permanent attachment of the support arm.
  • the oppositely arched back and abdominal surfaces of the wing in the case of a shell structure, impart a remarkable dimensional stability to the wing, due to the fact that the domes act as a self-supporting arch or cone structure which in particular acts on the loads which are perpendicular to the vertexes of the domes . resist.
  • Said features give the wing more shape-related structural properties which further material savings and thus a weight saving is possible.
  • materials which have lower structural properties and are thus less costly.
  • the aerodynamic and mechanical loads are spontaneously directed to the center of the wing of elliptical contour corresponding to the area of the vertex of the sash of the sash where attachment or attachment of the end of the single girder arm is provided which has a cross-section and rigidity which are suitable to achieve the necessary stability and resistance to generally avoid induced resonances and vibrations.
  • the wings of a wind rotor are arranged with the vertical axis parallel to the vertical axis of rotation, but the constructive features proposed by the invention do not rule out that the wings are arranged with the axis of the wing extension to the vertical angled, in which case all the above aerodynamic and mechanical advantages are maintained.
  • Fig. 1 is a schematic perspective view of a vertical axis of rotation wind turbine with three blades according to the invention, each carried by a single arm which projects radially from a hub; it is the wind direction and the direction of rotation marked.
  • Fig. 2 shows the plan view of the substantially elliptical wing according to the invention with an indication of the area of attachment of the single support arm by hatching and hinting of the different wing cross-section in two spaced-apart positions.
  • Fig. 3 shows the longitudinal section of the wing shown in Fig. 2 according to a vertical sectional area which includes the vertical axis of the wing.
  • Fig. 4 shows the elliptical outline of an arrow-shaped wing according to the invention with an indication of the area of attachment of the single support arm by hatching and with an indication of the wing profile in two spaced-apart positions.
  • FIG. 5 shows the section according to a vertical sectional area which passes through the intersection of the lines which connect the aerodynamic pressure points on the wings shown in FIG.
  • FIG. 6 shows the section according to a sectional area containing the line connecting the aerodynamic printing centers on the wing shown in FIG.
  • the wind turbine with a vertical axis of rotation is essentially composed of a central hub 1 mounted to rotate about a vertical axis of rotation A, consisting of support arms 2 which project radially from said hub 1 and wings 3 secured to the outer ends of these arms 2.
  • the wing 3 according to the invention has a substantially elliptical outline in the sense that, be it the leading edge 3b and the trailing edge 3c arcuate, substantially elliptical arc-shaped with stronger or weaker expression, are.
  • the connecting or transition lines 3g between the leading edge 3b and the trailing edge 3c may be substantially rectilinear 3g or arcuate 13g.
  • the wing 3 has a horizontal axis of symmetry H and possibly a vertical axis of symmetry V, for example when the leading edge has a curved course 13b which is identical to the course of the trailing edge 3c. If, however, said two edges of the wing 3 have different course, the axis V will be a substantially central line which vertically, geometrically at half the distance between the two edges through the center of gravity of the wing 3, which is slightly closer to the leading edge 3b extends or passes through the aerodynamic pressure centers of the wing.
  • the wing in the region of the horizontal axis of symmetry H has the largest width (chord) and also the wing profile here corresponds to the largest cross-section.
  • the wing profile changes by becoming progressively narrower and having a minimal cross-section at both ends.
  • the wing profile may be of the type "naca 0021", for example, while the wing profile may be of the "naca 0012" type in the direction of the two ends.
  • the curvature may also be "conical", in which case the lines 3i, 3e and 13e will essentially be rectilinear oblique and form a vertex (a curve tip) in the region of the horizontal axis of symmetry H.
  • the invention does not exclude that one of the lines of the longitudinal section of the wing is arc-shaped, for example elliptical, runs while the corresponding line on the opposite side is rectilinear, wherein, in the region of the horizontal axis H, the vertex of an obtuse angle is formed.
  • the substantially elliptical longitudinal section of the wing 3 gives the wing, due to the curved or conical, a remarkable stability and creates in the area of the horizontal axis of symmetry H a zone 3f which, regarding the structure and the dimensions, for the effective and resistant attachment of the outer end of the support arm 2 is suitable.
  • the shape of the blade 3 according to the invention lends itself to a one-piece or a composite shell construction, with or without internal filling material, to the advantages of, caused by the curved "dome-shaped" shape of the shell, stability as well as a construction with internal supporting structure which is covered by said shell, used, in which case said shell exclusively aero- and fluidodynamic functions fulfilled or, together with said internal structure, has a supporting function.
  • the thickness of the one-piece or composite shell forming the shape of the wing 3 may be constant or different in relation to the loads acting thereon.
  • this invention always has a horizontal axis of symmetry H and the area of attachment or attachment 3Of of the single beam 2 lies substantially in the region of the horizontal axis of symmetry H and the point of intersection the lines G connecting the aerodynamic pressure centers.
  • this area 30f corresponds to the circle tip or the vertex of the curvature of the back-side surface 30e and the belly-side surface 30i of the vane 30.
  • the curvature of said surfaces may be symmetrical, according to a vertical axis S, or, for example, if the back surface 3Oe is more curved than the curvature 3Oi of the abdominal surface, is asymmetrical.
  • the transition lines between the leading edge 30b and the trailing edge 30c at the two ends of the wing 30 arcuately 130g or pointed 30g run.
  • the progressive reduction of the wing profile from the region of the horizontal axis of symmetry H to the two ends of the wing 30 causes substantially in the region of the lines G which connect the aerodynamic pressure centers, the back surface and the abdominal surface curved or straight angled 30h, 30k run.
  • the curved course 3Oi 1 3Oe 1 13Oe of the back and the abdominal surface in the region of the horizontal axis of symmetry H causes that in the area 3Of the vertex of the said bulges, the ideal, most resistant point, with the largest cross-section, for the attachment or connection of the single support arm 2 is.
  • the bulges which are represented by the lines 3h and 30k bring about the necessary stability and rigidity in the region of the lines G for those parts of the wing 30 which extend "backwards" beyond the attachment region 3Of to the rear less pronounced, with the lines G forming an angle between an obtuse angle near 180 ° and an acute angle smaller than 90 °.

Landscapes

  • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

La présente invention concerne une pale destinée à une turbine éolienne présentant un axe de rotation vertical qui est porté par un unique bras (2) qui dépasse radialement d'un moyeu (1) monté rotatif (R) par rapport à l'axe vertical (A), la pale présentant un profil sensiblement elliptique, rectiligne (3) ou en flèche (30), symétrique par rapport à un axe horizontal (H), dont la vue en coupe - le long d'une surface de coupe verticale qui contient les sommets de la surface dorsale et de la surface ventrale de la pale (3, 30) - se caractérise par une forme sensiblement elliptique qui est définie par l'allure bombée (3i, 3e, 13e; 30i, 30e, 130e) de ces surfaces, les sommets desdits bombements se trouvant dans la zone de la plus grande largeur (corde) de la pale (3, 30) et formant la zone destinée à la mise en place ou à la fixation (3f, 30f) de l'unique bras (2).
EP08758668A 2007-05-24 2008-05-21 Pale pour turbines éoliennes présentant un axe de rotation vertical Withdrawn EP2147210A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000022A ITBZ20070022A1 (it) 2007-05-24 2007-05-24 Ala per turbine eoliche ad asse di rotazione verticale
PCT/EP2008/004062 WO2008141813A2 (fr) 2007-05-24 2008-05-21 Pale pour turbines éoliennes présentant un axe de rotation vertical

Publications (1)

Publication Number Publication Date
EP2147210A2 true EP2147210A2 (fr) 2010-01-27

Family

ID=40032214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08758668A Withdrawn EP2147210A2 (fr) 2007-05-24 2008-05-21 Pale pour turbines éoliennes présentant un axe de rotation vertical

Country Status (3)

Country Link
EP (1) EP2147210A2 (fr)
IT (1) ITBZ20070022A1 (fr)
WO (1) WO2008141813A2 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8381464B2 (en) * 2003-04-02 2013-02-26 P4P Holdings Llc Solar array support methods and systems
US9564851B2 (en) 2003-04-02 2017-02-07 P4P Holdings, LLC Solar array support methods and systems
US20100314509A1 (en) 2003-04-02 2010-12-16 Conger Steven J Solar array support methods and systems
US8278547B2 (en) 2003-04-02 2012-10-02 P4P Holdings Llc Solar array support methods and systems
US8875450B2 (en) 2003-04-02 2014-11-04 P4P Holdings, LLC Solar array system for covering a body of water
US8212140B2 (en) 2003-04-02 2012-07-03 P4P, Llc Solar array support methods and systems
US8030792B2 (en) 2009-03-12 2011-10-04 Eastern Wind Power Vertical axis wind turbine system
US8648483B2 (en) 2009-03-12 2014-02-11 Eastern Wind Power Vertical axis wind turbine system
AU2010252559B2 (en) * 2009-05-26 2016-07-28 Leviathan Energy Wind Lotus Ltd. Two-bladed vertical axis wind turbines
CN201486753U (zh) 2009-06-26 2010-05-26 北京希翼新兴能源科技有限公司 垂直轴复合式风轮机
CN201865840U (zh) 2009-09-18 2011-06-15 北京希翼新兴能源科技有限公司 垂直轴风力发电机风叶及其风轮
DE102010016086A1 (de) * 2010-03-23 2011-11-24 Anneliese Penn Rotorblatt für H-Rotor
US7988413B2 (en) 2010-04-23 2011-08-02 Eastern Wind Power Vertical axis wind turbine
FR2980244B1 (fr) * 2011-09-19 2014-07-04 Sabella Pale d'hydrolienne
ITMC20120074A1 (it) * 2012-09-06 2012-12-06 Ambrosio Giuseppe D Turbina multi pale con nucleo centrale a sezione poligonale.

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DE462409C (de) * 1928-07-10 Aero Dynamo Akt Ges Fluegel fuer Windkraftmaschinen
DE2821899C3 (de) * 1978-05-19 1981-02-05 Erich 6100 Darmstadt Herter Windturbine
DE69301094T2 (de) * 1993-10-14 1996-12-19 Raul Ernesto Verastegui Windturbine mit senkrechter Achse
JP3330141B1 (ja) * 2001-11-09 2002-09-30 学校法人東海大学 一体型風水車とその製造方法
AU2002354483A1 (en) * 2001-12-14 2003-06-30 Global Energy Co., Ltd. Wind power generator, windmill, and spindle and blade of the windmill
JP4191405B2 (ja) * 2001-12-14 2008-12-03 株式会社グローバルエナジー 動力用風車の設置方法並びに風力発電機の設置方法
DK176176B1 (da) * 2004-11-24 2006-11-27 Siemens Wind Power As Fremgangsmåde og samlestykke til samling af en vinge, fortrinsvis vindmöllevinge, i sektioner

Non-Patent Citations (1)

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Title
See references of WO2008141813A3 *

Also Published As

Publication number Publication date
WO2008141813A2 (fr) 2008-11-27
WO2008141813A3 (fr) 2009-04-30
ITBZ20070022A1 (it) 2008-11-25

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