WO2005017351A1 - Rotor a diametre variable - Google Patents

Rotor a diametre variable Download PDF

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Publication number
WO2005017351A1
WO2005017351A1 PCT/US2003/023748 US0323748W WO2005017351A1 WO 2005017351 A1 WO2005017351 A1 WO 2005017351A1 US 0323748 W US0323748 W US 0323748W WO 2005017351 A1 WO2005017351 A1 WO 2005017351A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
rotor
extensions
blades
extension
Prior art date
Application number
PCT/US2003/023748
Other languages
English (en)
Other versions
WO2005017351A8 (fr
Inventor
Peter Mckeich Jamieson
Chris Hornzee-Jones
Emilian M. Moroz
Ralph W. Blakemore
Original Assignee
General Electric Company
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 General Electric Company filed Critical General Electric Company
Priority to AU2003263827A priority Critical patent/AU2003263827A1/en
Priority to PCT/US2003/023748 priority patent/WO2005017351A1/fr
Publication of WO2005017351A1 publication Critical patent/WO2005017351A1/fr
Publication of WO2005017351A8 publication Critical patent/WO2005017351A8/fr

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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0236—Adjusting aerodynamic properties of the blades by changing the active surface of the wind engaging parts, e.g. reefing or furling
    • 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
    • F05B2240/202—Rotors with adjustable area of intercepted fluid
    • F05B2240/2021—Rotors with adjustable area of intercepted fluid by means of telescoping 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
    • 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
    • F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
    • F05B2240/313—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape with adjustable flow intercepting area
    • 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

Definitions

  • the field of the invention relates to wind turbines. More specifically, the invention relates to the use of a variable diameter rotor for wind turbines.
  • Wind power is one of the cleanest and most environmentally friendly methods of producing electrical energy currently available. Wind power can produce major amounts of electrical energy without the production of carbon dioxide and other greenhouse gases. Additionally, wind power is renewable, as opposed to traditional fossil fuel sources of energy.
  • the amount of electrical energy generated is based in part on the size of the rotors used by the wind turbine and its relationship to the size of electrical generator.
  • a general rule is that wind energy is proportional to the square of the diameter of the rotor.
  • a second factor that contributes to the amount of electrical energy is the speed of the winds acting upon the rotor. If a large rotor relative to the size of the generator is suddenly acted upon by high winds, it can produce more electricity than the generator can absorb and additionally over stress the structure. Conversely, in a time of low winds, if the rotor is not large enough for the generator, the wind turbine efficiency may be low and the structure will see only a small proportion of its load carrying potential. What is needed is a wind turbine that can adjust to handle varying wind speed conditions in an efficient manner, while attempting to maximize energy capture for a given support structure.
  • a wind turbine rotor that comprises a center hub, a first set of aerofoil rotor blades arranged around the center hub, and a first set of aerofoil rotor blade extensions nested inside the first set of aerofoil rotor blades.
  • the first set of extensions are capable of extending an amount less than or equal to the length of the first set of blades by protracting from the first set of blades.
  • Figure 1 illustrates a standard wind turbine power generating system.
  • Figures 2a-2c illustrates one embodiment of a wind turbine with adjustable rotor blades that can extend to operate at various diameters.
  • Figure 3 illustrates different methods of varying the length a rotor blade and consequently the diameter of the rotor blades.
  • Figure 4 illustrates one embodiment of a blade and sliding extension.
  • Figure 5a illustrates one embodiment of a winch pulley extension system.
  • Figure 5b illustrates one embodiment of an extender slide system.
  • Figure 6 illustrates different grounding mechanisms for blade extensions.
  • Figures 7a-7e illustrate exemplary power curves.
  • variable diameter rotor for a wind turbine generator is disclosed.
  • numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that these specific details need not be used to practice the present invention. Well-known structures, materials, circuits, processes and interfaces have not been shown or described in detail in order not to unnecessarily obscure the present invention.
  • the variable diameter rotor includes base blades and one or more blade extensions associated with the base blades.
  • the blade extensions move between positions that range from fully extended to fully retracted.
  • the blade extensions for a blade may be independent from each other in that various blade extensions for a blade may be more extended or retracted than the other blade extensions for that blade.
  • the extension and retraction of rotor blades to increase or decrease rotor diameter, respectively is based on wind conditions and blade pitch angle. For example, in low winds, the rotor may be fully extended. As the winds increase in speed, the blades may start to pitch and a portion of the rotor blades may be retracted. In high winds, the rotor blades may be fully retracted. Thus, the diameter of the rotor may be increased to increase energy capture in frequently occurring moderate wind speeds (e.g., below rated wind speed) where most of the energy is available. At the same time, the rotor diameter may be reduced in high winds that would cause loads that would otherwise penalize a rotor of relatively large diameter.
  • Figure 1 illustrates one embodiment of a wind turbine. Referring to
  • Rotor blades 100 are coupled to rotor hub 105.
  • Rotor blades 100 and rotor hub 105 form the wind turbine rotor, which is a variable diameter rotor with one or more blade extensions.
  • rotor blades 100 include aerofoils that nest telescopically within blade sections of greater dimension also using aerofoils, thereby preserving greater rotor efficiency. That is, the rotor blades comprise sections that have the ability to nest a narrow, constant chord or tapered aerofoil section inside a wide airfoil section.
  • Hub 105 is attached to a nacelle 110 by the shaft 115.
  • the rotation of shaft 115 is coupled to a gearbox 120.
  • An electrical control system 135 monitors the conditions of the wind turbine, making appropriate adjustments as necessary.
  • the electronic control system 135 controls a yaw mechanism 140, which controls the direction of the turbine upon tower 145.
  • the electronic control system 135 also controls the pitch mechanism 150, which control the pitch angle of the rotor blades 100, the rotational speed of the shaft 115 and the extension of the rotor blades 100.
  • the diameter of the rotor is adjusted by extending or retracting the blade extensions.
  • the extension or retraction of blade extensions is performed based on wind speed. The change of rotor diameter compensates for differences in wind speed and turbulence, with a goal being to convert as much wind energy to electrical energy as possible in an efficient manner, while keeping loads within prescribed levels.
  • Figures 2a-c illustrate the variable diameter rotor in three positions: fully extended, fully retracted, and a position between fully extended and fully retracted.
  • Figure 2a shows the rotor with rotor blades fully extended. This position may be helpful in capturing energy from low velocity winds.
  • Figure 2b shows the rotor with the rotor blade extensions fully retracted. This position may be used when the wind turbine is capturing energy from high velocity winds and trying to avoid accumulating excessive fatigue loads and large extreme loads.
  • Figure 2c shows the rotor with rotor blade extensions only partially extended. This position may be useful for moderate wind conditions. The blade extensions can be extended based on the wind speed measured from an anemometer or by the power produced by the generator.
  • variable diameter rotor may operate with a larger diameter and higher rating than a baseline fixed diameter turbine and the load is regulated using the pitch system.
  • a torque factor greater than a conventional baseline turbine e.g., 1.5 times baseline torque
  • a minimum pitch angle e.g., 1°
  • the minimum pitch angle is immediately set to another predetermined value (e.g., 8°) greater than that used when the rotor diameter is at its maximum. This helps to reduce, and potentially minimize, loads on the system.
  • Figure 3 a shows a base blade 300 with a blade extension 310, in which the base blade 300 is attached to the central hub 105.
  • Figure 3b shows the same base blade 300 with the extension 310 fully retracted.
  • Blade extension 310 is nested in base blade 300, and is capable of being extended or retracted along a track or other guidance mechanism.
  • the base blade comprises a glass/epoxy blade, and the blade extension may be carbon epoxy. Alternatively, other lightweight compounds may be used.
  • Figure 3c shows an embodiment in which a second blade extension 320 is added to blade extension 310, with all blade extensions being fully extended.
  • Figure 3d shows the same double extension rotor blade having its blade extensions 310 and 320 being fully retracted (blade extension 320 nested within blade extension 310 and blade extension 310 being nested in base blade 300). Blade extension 320 is extended or retracted along a guidance mechanism, possibly similar to the one used to guide blade extension 310.
  • Figure 3e shows an embodiment in which the blade is split into a base blade 300, a first blade extension 310 and a secondary blade extension 330.
  • Figure 3f shows the same blade arrangement with the blade extensions 310 and 330 retracted, such that blade extension 310 is nested partially in the base blade 300 and partly in the secondary blade 330.
  • Figure 3g shows an alternate embodiment in which blade extension 315, rather than the base blade 300, is the wider of the two blades.
  • Figure 3h shows the same design where blade extension is retracted.
  • Figure 3i shows an embodiment where the rotor blade includes three sections.
  • Figure 3j shows the blade in a fully retracted position.
  • Figure 3k shows base blade 300 attached to the center hub 105 being narrower than blade extension 315.
  • a second blade extension 340 is attached to the opposite end of blade extension 315 from base blade 300.
  • Figure 31 shows both extensions retracted. In one embodiment, both the base blade 300 and extension 340 fit completely within blade extension 315 when fully retracted. In an alternative embodiment, each extension partially fits within blade extension 315.
  • Figure 3m shows an alternate method of deployment for blade extension
  • Blade extension 310 from the base blade 300.
  • a hinge 350 connects the extension 310 to base blade 300 at the end opposite of hub 105.
  • Blade extension 310 jackknifes open in any one of a number of directions.
  • Figure 3n shows blade extension 310 in a closed, or "retracted" position.
  • blade extension 310 is spring-loaded for moving in the extended position.
  • inertial force and friction blocks are used.
  • a cable winch may be used to retract the blades during high winds.
  • the blade extension is spring loaded in the retracted position and cable, screw jacks, linkages and/or pistons may be used to extend blade extension 310.
  • Figure 3o shows an embodiment in which blade extension 360 is inflatable or otherwise elastic.
  • Figure 3p shows blade extension 360 when deflated or otherwise deformed to minimum size.
  • Figure 3q illustrates an embodiment where inflatable or elastic blade extension 370 is between hub 105 and base blade 300.
  • Figure 3r shows this extension 370 deflated or deformed to minimum size.
  • the inflatable extension partially inflates or elastically grows depending on wind speed, pitch angle and other control factors.
  • Figures 3a-3r only illustrate the rotor blades only in fully extended or fully retracted positions. However, in operation, the blade extensions may only be partially extended or retracted at times depending, in part, on wind conditions. To that extent, the blade extensions and base blades move relative to each other.
  • FIG 4. One embodiment of the slider track used to guide a blade extension between extended and fully retracted positions is illustrated in Figure 4.
  • Blade extension 310 is guided by one or more bearing tracks 400 in the interior of the base blade 300. This movement may be facilitated by the use of slider bearings.
  • An extender root block 410 is attached to the end of blade extension 310 closest to the base blade 300. Bearing pads 420 are arranged around the extender root block 410 to facilitate movement on the bearing track 400.
  • Two support spars straddling blade extension 310 replace internal center support spars that would be normally used to support the base blade.
  • the slider bearing may comprise glass-filled PTFE flat sheet material.
  • anti-friction rolling element, hydrodynamic or hydrostatic bearings are used in place of the slider bearings.
  • friction guide blocks may be used on the blade extensions 310 or friction pads at the ends of the base blades 300 to prevent slippage of blade extension 310.
  • a set of replaceable seal strips (not shown) between the base blade 300 and blade extension 310 prevent wind, snow, and other debris from obstructing the rotor blade retracting or extending.
  • a bearing track material there are a number of options for a bearing track material and some exemplary materials are as follows: a) glass/epoxy structural laminate within a directional surface laminate and no gel coat; b) phenolic laminate (e.g., Tufhol) facings, which is non-corroding and will act as a failsafe bearing should the PTFE pad become excessively worn; and c) stainless steel facings, which works well with PTFE, is durable and relatively inexpensive.
  • phenolic laminate e.g., Tufhol
  • Additional bearings within the tip of the base blade may be used to limit any undesirable motion of the extending portion of the blade relative to the base blade.
  • the base blade structure may have to be reinforced to handle the load associated with the sliding blade extension and the slider track.
  • a cable winch as shown in Figure 5 a, is used for extending and retracting the extensions 310.
  • a cable winch 500 is inserted into the blade base.
  • the cable 510 e.g., steel wire rope, braided non-metallic rope
  • the cable 510 is run through a pulley 520 attached to the end of the extender root block 410.
  • Fixed guides are included for cable 510.
  • a moving cross bar 530 supports the cable when the extender is fully extended. Cross bar 530 fastens between the base blade sheer webs to offer support and separation of the cable when the blade extension is deployed.
  • the blade extension is extended using mechanical or inertial force. To keep the extension in place, friction pads may be used.
  • the winch is sized for the maximum load required to winch against the forces composed of the inertial forces and aerodynamic load at normal operational speeds and guide bearing friction.
  • the winch is anchored into the base blade on a fabricated frame.
  • a cable system may be used in conjunction with one or more pulleys to cause the blade extension to extend as a cable is pulled towards the rotor hub.
  • additional methods of extending and retracting the extension include, for example, but not limited to, a recirculating ball worm screw, a jacking screw, a pneumatic retraction and extension system, and a hydraulic retraction and extension system.
  • Figure 5b illustrates one embodiment of an extender slide system showing the root end of a blade extension. This may operate in conjunction with the cable winch system of Figure 5 a.
  • the extender slide system includes pads 540 that help self-aligning holders carried on the blade extension. The mounting arrangements for the bearing pads permits self-aligning action both longitudinally and traversely.
  • the blade extensions can be grounded to protect against strikes by lightning, as shown in Figure 6.
  • Figure 6a shows a spark gaps model of lightning protection.
  • a conductive mesh 600 is laminated into the skin of the extension 310.
  • the mesh on the extension 310 is connected to the steel wire pulley cable 510 by spark gaps 610.
  • a second group of spark gaps 620 are placed at the cable winch 500 end of the cable 510 to provide an electrical connection to the hub casting 105.
  • the base blade 300 is protected by a standard tip stud 630 and bonding conductor 640 through to the hub casting 105.
  • the blade extension also has a tip stud and bonding conductor.
  • FIG. 6b shows an alternate embodiment of the grounding device for the extension.
  • the blade extension 310 uses a conductive mesh 600 or tip stud and bonding conductor. Instead of the spark gaps, a sliding contact 650 is attached to the root base of the blade extension.
  • the sliding contact 650 is in constant contact with either a conductive bus bar, a conductive bearing track 660, or some other device to allow connectivity with the hub.
  • Figures 7a-7e show exemplary power curves.
  • Figure 7a is the normal power curve of a conventional baseline wind turbine with fixed diameter rotor.
  • Figure 7b illustrates a power curve that results from an increase in diameter for a turbine with one embodiment of a variable diameter rotor taking the variable diameter rotor up a steeper cubic curve in wind speeds below rated and achieving rated power in a lower wind speed. If the tip speed is the same as baseline at rated wind speed and the diameter is larger, the shaft speed must be less and the rated torque greater than baseline for the same power.
  • Figure 7c is a power curve for a variable diameter rotor in which torque is not allowed to rise above baseline, a worthwhile restriction for a small energy loss.
  • the variable diameter rotor is capable however of further diameter contraction and, at constant tip speed, some further increase in rotor speed. This allows more power to be generated, as shown in Figure 7d, without any increase in gearbox torque.
  • variable diameter rotor In contrast to conventional wind turbines, the variable diameter rotor may be operated with a relatively larger rotor diameter and higher power. Load regulation may be controlled using appropriate control of pitch system set points and diameter/speed variation. As torque factor increases, the rotor thrust increases. Even for small increases in torque factor, from 1 through 1.3 to 1.5 (at a 1° minimum pitch setting), the increase in rotor thrust may be substantial. To avoid an increase in rotor thrust when increases in torque factor are made, the minimum pitch angle may be increased. For example, the minimum pitch angle may be increased from a more normal 1° to 6° and 8° for torque factors of 1.3 and 1.5.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (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

L'invention concerne un système et un procédé de changement du diamètre du rotor d'une éolienne en fonction des changements de vitesse du vent et des charges du système de commande. Les pales de rotor sur l'éolienne peuvent régler la longueur par des extensions logées dans la pale de base ou la contenant. Les pales peuvent posséder une ou plusieurs extensions selon une variété de configurations. Un système de treuillage, un système hydraulique, un système pneumatique, des extensions gonflables ou élastiques et un déploiement en portefeuille à ressort, sont utilisés dans les méthodes de réglage. L'extension est également protégée de la foudre par un système de mise à la terre.
PCT/US2003/023748 2003-07-29 2003-07-29 Rotor a diametre variable WO2005017351A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003263827A AU2003263827A1 (en) 2003-07-29 2003-07-29 Variable diameter rotor
PCT/US2003/023748 WO2005017351A1 (fr) 2003-07-29 2003-07-29 Rotor a diametre variable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2003/023748 WO2005017351A1 (fr) 2003-07-29 2003-07-29 Rotor a diametre variable

Publications (2)

Publication Number Publication Date
WO2005017351A1 true WO2005017351A1 (fr) 2005-02-24
WO2005017351A8 WO2005017351A8 (fr) 2006-02-23

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AU (1) AU2003263827A1 (fr)
WO (1) WO2005017351A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008012615A2 (fr) 2006-07-21 2008-01-31 Clipper Windpower Technology, Inc. Structure rétractable de pale de rotor
DE102007062616A1 (de) * 2007-12-22 2009-06-25 Arno Helper Ausfahrbare Windkraftmaschine
ES2335640A1 (es) * 2009-01-27 2010-03-30 Universidad Politecnica De Madrid Pala para aerogeneradores.
WO2009095758A3 (fr) * 2008-01-30 2010-04-22 Clipper Windpower, Inc. Structure de pale rétractable à bord de fuite fendu
EP2368795A2 (fr) 2010-03-09 2011-09-28 Rolls-Royce plc Agencement d'hélice
CN102220935A (zh) * 2010-04-15 2011-10-19 通用电气公司 用于风力涡轮机叶片的可构造小翼
GB2508814A (en) * 2012-12-05 2014-06-18 Hugh Malcolm Ian Bell Concentric turbine arrangement
CN105626394A (zh) * 2016-02-02 2016-06-01 上海交通大学 可伸缩风机叶片
EP2419626A4 (fr) * 2009-04-13 2017-03-22 Frontier Wind, LLC Pale de turbine éolienne de longueur variable ayant des éléments de zone de transition
AT524720A1 (de) * 2021-01-22 2022-08-15 Schmidt Michael Rotorblatt für eine Windkraftanlage
DE102021004586A1 (de) 2021-11-30 2023-06-01 Christian Niestolik Umweltfreundlich & Ökologisch Stromproduzieren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768923A (en) * 1969-09-18 1973-10-30 United Aircraft Corp Variable length blade
US5630705A (en) * 1992-04-29 1997-05-20 Eikelenboom; Pieter A. J. Rotor construction for windmill
WO2003036082A1 (fr) * 2001-10-25 2003-05-01 Clipper Windpower Technology, Inc. Rotor dote de pales extensibles et critere de commande associe
US20030123973A1 (en) * 1999-11-11 2003-07-03 Mitsunori Murakami Propeller type windmill for power generation
EP1327773A2 (fr) * 2002-01-10 2003-07-16 Mitsubishi Heavy Industries, Ltd. Eolienne avec système de contrôle actif de surface balayée par les pales
US20030138315A1 (en) * 2002-01-18 2003-07-24 Brueckner Manfred K. Sky turbine-city

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768923A (en) * 1969-09-18 1973-10-30 United Aircraft Corp Variable length blade
US5630705A (en) * 1992-04-29 1997-05-20 Eikelenboom; Pieter A. J. Rotor construction for windmill
US20030123973A1 (en) * 1999-11-11 2003-07-03 Mitsunori Murakami Propeller type windmill for power generation
WO2003036082A1 (fr) * 2001-10-25 2003-05-01 Clipper Windpower Technology, Inc. Rotor dote de pales extensibles et critere de commande associe
EP1327773A2 (fr) * 2002-01-10 2003-07-16 Mitsubishi Heavy Industries, Ltd. Eolienne avec système de contrôle actif de surface balayée par les pales
US20030138315A1 (en) * 2002-01-18 2003-07-24 Brueckner Manfred K. Sky turbine-city

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008012615A2 (fr) 2006-07-21 2008-01-31 Clipper Windpower Technology, Inc. Structure rétractable de pale de rotor
WO2008012615A3 (fr) * 2006-07-21 2008-05-02 Clipper Windpower Technology Structure rétractable de pale de rotor
AU2007278980B2 (en) * 2006-07-21 2012-03-29 Clipper Windpower, Inc. Retractable rotor blade structure
DE102007062616A1 (de) * 2007-12-22 2009-06-25 Arno Helper Ausfahrbare Windkraftmaschine
WO2009095758A3 (fr) * 2008-01-30 2010-04-22 Clipper Windpower, Inc. Structure de pale rétractable à bord de fuite fendu
WO2010086472A1 (fr) * 2009-01-27 2010-08-05 Universidad Politécnica de Madrid Pale d'éolienne
ES2335640A1 (es) * 2009-01-27 2010-03-30 Universidad Politecnica De Madrid Pala para aerogeneradores.
EP2419626A4 (fr) * 2009-04-13 2017-03-22 Frontier Wind, LLC Pale de turbine éolienne de longueur variable ayant des éléments de zone de transition
EP2368795A2 (fr) 2010-03-09 2011-09-28 Rolls-Royce plc Agencement d'hélice
US8770935B2 (en) 2010-03-09 2014-07-08 Rolls-Royce Plc Propeller arrangement
CN102220935A (zh) * 2010-04-15 2011-10-19 通用电气公司 用于风力涡轮机叶片的可构造小翼
GB2508814A (en) * 2012-12-05 2014-06-18 Hugh Malcolm Ian Bell Concentric turbine arrangement
GB2508814B (en) * 2012-12-05 2020-11-11 Malcolm Ian Bell Hugh Modular high efficiency renewable energy turbine
CN105626394A (zh) * 2016-02-02 2016-06-01 上海交通大学 可伸缩风机叶片
AT524720A1 (de) * 2021-01-22 2022-08-15 Schmidt Michael Rotorblatt für eine Windkraftanlage
DE102021004586A1 (de) 2021-11-30 2023-06-01 Christian Niestolik Umweltfreundlich & Ökologisch Stromproduzieren

Also Published As

Publication number Publication date
AU2003263827A1 (en) 2005-03-07
AU2003263827A8 (en) 2005-03-07
WO2005017351A8 (fr) 2006-02-23

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