EP1778972A1 - Systeme d'extraction d'energie eolienne - Google Patents

Systeme d'extraction d'energie eolienne

Info

Publication number
EP1778972A1
EP1778972A1 EP05767404A EP05767404A EP1778972A1 EP 1778972 A1 EP1778972 A1 EP 1778972A1 EP 05767404 A EP05767404 A EP 05767404A EP 05767404 A EP05767404 A EP 05767404A EP 1778972 A1 EP1778972 A1 EP 1778972A1
Authority
EP
European Patent Office
Prior art keywords
wind
flow
impellor
concentrator wings
concentrator
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Withdrawn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
EP05767404A
Other languages
German (de)
English (en)
Other versions
EP1778972A4 (fr
Inventor
Angus J. Tocher
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
Priority claimed from US10/892,896 external-priority patent/US7220096B2/en
Application filed by Individual filed Critical Individual
Publication of EP1778972A1 publication Critical patent/EP1778972A1/fr
Publication of EP1778972A4 publication Critical patent/EP1778972A4/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Withdrawn legal-status Critical Current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
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • 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
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • 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
    • F05B2240/40—Use of a multiplicity of similar components
    • 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 present invention relates to using wind energy and in particular, to safely and efficiently extracting energy from the wind and converting it to usable energy.
  • Shrouded turbines generally allow the use of smaller and more enclosed rotor blades or impellors, and have physical shrouds or ring shaped concentrator wings that are highly visible to birds in flight but at the same time do not present moving objects, such as large rotating blades that are considered by many to visually mar the natural landscape.
  • versions having two or more concentrator wings that allow the wind to flow between the concentrator wings and develop a vacuum or suction that drives the turbine have demonstrated, in recent times, to be the most promising and efficient devices.
  • This invention provides an improvement in wind energy extraction devices.
  • a system and method for safely and efficiently extracting energy from wind and converting it to usable energy comprising one or more concentrator wings that react with a flow of wind to induce a drop in static air pressure that is then used to drive one or more impellors and one or more power converters; and a flow regulator having aerodynamic surfaces directing a flow of wind impinging upon said flow regulator outwards from said flow regulator and towards a said flow of wind reacting with said one or more concentrator wings.
  • a wind energy extraction device comprising an impellor and associated power converter for the impellor; concentrator wings disposed about the impellor, the concentrator wings being spaced apart to permit air flow between the concentrator wings; the impellor being positioned in relation to the concentrator wings to be driven in use by a flow of wind induced by the air flow between the concentrator wings; and a flow regulator positioned downstream of the impellor, the flow regulator having wind deflecting aerodynamic surfaces that are contoured to enhance laminar flow of the air flow between the concentrator wings.
  • a wind energy extraction device comprising plural impellors and at least one associated power converter for the impellors, concentrator wings disposed about the impellors, the concentrator wings being spaced apart to permit air flow between the concentrator wings; and the plural impellors being positioned in relation to the concentrator wings to be driven in use by a flow of wind induced by the air flow between the concentrator wings.
  • an aerobrake such that the proximity of said turbine shroud to said flow regulator is adjusted to control the flow of wind through said turbine shroud; wherein more than one said power converters are positioned on the leeward side of said aerodynamic surfaces of said flow regulator; and further comprising more than one impellor driveshafts connecting more than one said impellors to more than one said power converters, said more than one impellor driveshafts extending out of said flow regulator and positioning more than one said impellors within the flow of wind passing through said turbine shroud, such that more than one said power converters operate in concert to control the rotational speed of more than one said power converters; a downwind guidance for supporting a plurality of elements to include at least said one or more concentrator wings and said flow regulator, said downwind guidance presenting little obstruction to the higher speed wind flow upstream of said elements, said downwind guidance facilitating the orientation of said plurality of elements approximately into the oncoming wind and said downwind guidance comprising
  • a wind energy extraction system that includes a stationary riser element that supports other elements of the system that are permitted to rotate about the riser element and align appropriately into the oncoming wind, and as well supports a lamp on top of the riser element for illuminating roadways, or an electrical insulator for carrying a power transmission line.
  • Fig. 1 provides, on the left side of the page, a perspective view of the invention, and on the right side of the page, a cross-sectional view of the same revealing additional internal components.
  • Fig. 2 is a cross-sectional view of the invention indicating a non-aerobraked position of the concentrator wings, turbine shroud and associated components.
  • Fig. 3 is a cross-sectional view of the invention indicating an aero-braked position of the concentrator wings, turbine shroud and associated components.
  • Fig. 4 is a schematic cross-sectional view of the windflow, indicated by arrows, interacting with the invention in a non-aerobraked condition.
  • Fig. 5 is a schematic cross-sectional view of same, with the invention in an aerobraked condition.
  • Fig. 6 is a schematic cross-sectional view of same, but without the aerobrake indicated so as to illustrate turbulence generated by the unregulated flow of wind out of the turbine shroud.
  • Fig. 7 is a duplication of Fig. 1 but including riser and foundation components and indicating the swivel action of the downwind guidance system.
  • Fig. 8 provides a plan view of a further embodiment of the invention revealing the introduction of multiple impellors and power converters, and indicating concentrator wings having straight running sections rather than the curving sections of previous figures.
  • Fig. 9 is a cross-sectional view of a further embodiment of the invention indicating a tower or riser running downwind of the aerodynamic surfaces of the flow regulator and having concentrator wings that serve as the turbine shroud enclosing the impellors as illustrated.
  • Fig. 10 provides two perspective views of the further embodiment of the invention, as also illustrated by Fig's 8 and 9, and presents elements of the invention rotated 90 degrees with respect to each other around a swivel or swivels according to the action provided by a system of alternate downwind guidance.
  • Fig. 11 provides an additional perspective view of two of the wind energy extraction systems each having in this case two sets of concentrator wings and three impellors. Also indicated are insulators mounted on top of the riser elements and carrying a transmission line interconnecting the two wind energy extraction systems and a utility power pole also indicated.
  • FIG. 6 therefore illustrates schematically, a cross section of the flow of wind through turbine shroud 14 and through three additional shrouds or concentrator wings 12.
  • Turbine shroud 14 serves to enclose impellor 16 which in turn serves to react with the wind flowing through turbine shroud 14 and drive power converter 22, not shown in this illustration, such as an alternator or generator.
  • Concentrator wings 12 operate fundamentally the same as aircraft wings and have similar profiles as may be readily seen from Fig. 6.
  • These profiles generally have a top convex shaped surface to accelerate the flow of wind, and a lower flattened or concaved surface that tends to slightly decelerate the flow of wind past these surfaces.
  • the profiles of concentrator wings 12 as illustrated are inclined, or have, in aeronautical terms, an angle of incidence that cause the wind flow to be deflected outwards from a central axis that runs parallel with the wind flow and concentric with concentrator wings 12 and turbine shroud 14.
  • concentrator wings 12 and wings of an aircraft is that concentrator wings 12 are generally, but not necessarily, ring shaped.
  • the lower wing in the biplane or triplane example, comparable to the largest diameter concentrator wing 12 in the example of wind energy extraction device 10, induces a lower static pressure region over the top surface of the wing that in turn causes an acceleration of the wind flow past the lower surface of the above wing, comparable to the second largest diameter concentrator wing 12 in the example of wind energy extraction device 10. This in turn causes an increased acceleration of the flow of wind over the top surface of this wing.
  • This configuration of multiple aircraft wings is used generally where higher lift and lower stall speeds are desired when it is necessary to limit the overall span of the wings to increase maneuverability of the aircraft.
  • this effect is used to increase the static pressure differential occurring between the inlet of wind to turbine shroud 14 and the outlet.
  • Another way of understanding the interaction of concentrator wings 12 in wind energy extraction device 10 is to appreciate that the largest concentrator wing 12 will induce a lower static air pressure field above its top surface and this field of lower static pressure will be further concentrated by the next largest concentrator wing 12 and so on until at the area where the airflow exits turbine shroud 14, this field is most highly concentrated.
  • wing stalling This occurs when the smooth flow of wind over the top surface of a wing suddenly separates further upwind and becomes turbulent. This may occur where the wing is subjected to too great an 'angle of attack' to the oncoming wind under low airspeeds or when the wing loading is increased such as during a steep banking turn. At such point, a dramatic loss of lift occurs from which the pilot must recover.
  • An objective of the wind energy extraction device described here is to provide a solution to this shortcoming of the prior art that is not dependant on any improved impellor design and is able to accommodate higher wind speeds without the stalling of concentrator wings 12 as continues to occur in the prior art.
  • Fig. 4 schematically illustrates a cross section of the more laminar flow of wind over and between concentrator wings 12 when the device of the present wind energy extraction device includes flow regulator 18.
  • Flow regulator 18 is a component having aerodynamic surfaces 50 that cause the stream of wind that is drawn into turbine shroud 14 to be directed outwards and away from a central axis running approximately parallel with the oncoming wind and through the centers, in one embodiment, of concentrator wings 12. This re-direction of the jet of wind exiting turbine shroud 14 maintains or promotes a smooth flow of wind over the top surfaces of concentrator wings 12 and thereby eliminates or reduces the aerodynamic stalling of concentrator wings 12 that would otherwise occur.
  • FIG. 5 therefore also schematically illustrates a cross section of the flow of wind over and between concentrator wings 12, through turbine shroud 14 and over aerodynamic surfaces 50 of flow regulator 18.
  • Fig. 5 relative to Fig. 4 is the closer proximity of flow regulator 18 to turbine shroud 14. This closer proximity restricts the flow of wind out of turbine shroud 14 thereby acting to aerodynamically brake impellor 16 in the event of overly gusting or very high speed winds.
  • Aerobrake 20 therefore includes flow regulator 18 and turbine shroud 14 and an adjustment of the proximity between flow regulator 18 and turbine shroud 14 to prevent impellor 16 or other components of wind energy extraction device 10 from overspeeding or exceeding other design limitations in gusting or very high speed winds.
  • turbine shroud 14 as illustrated is hereby defined as a special case of concentrator wing 12 that in the case of turbine shroud 14 is used in association with impellor 16.
  • a device having aerodynamically active surfaces as described for concentrator wings 12 may as well be used as turbine shroud 14 and interact with flow regulator 18 to serve in the definition of aerobrake 20. An adjustment of the proximity of flow regulator 18 and turbine shroud 14 will now be described.
  • Fig. 2 provides a cross-sectional view of elements of wind energy extraction device 10 and in particular illustrates an adjustment of the proximity of turbine shroud 14 to flow regulator 18.
  • Fig. 2 like Fig. 4 illustrates components of wind energy extraction device 10 in a non-aerobraked condition where turbine shroud 14 is in a far position relative to flow regulator 18.
  • the length of the relative far position is indicated by the letter “A”.
  • Fig. 3 provides an identical view with the exception that components of wind energy extraction device 10 are now in an aerobraked position where turbine shroud 14 is in a close position relative to flow regulator 18. In this instance, the length of this relative close position is indicated by the letter "B".
  • Aerobrake 20 allows concentrator wings 12 or turbine shroud 14 to be pushed by the force of a gusting or high speed wind upon these elements.
  • Concentrator wings 12 and turbine housing 14 are connected together by retainers 28, one of which is illustrated in Fig's 2 and 3.
  • Retainer 28 then connects with collar 36 that is free to slide along lee support 32.
  • Turbine shroud 14 is also connected to struts 40, one of which is illustrated in each of Fig's 2 and 3, struts 40 then connecting to another collar 36 that is free to slide on driveshaft housing 38 visible in Fig. 3. Referring now to Fig.
  • wind energy extraction device 10 in conditions where the wind is not overly gusting or overly high speed, wind energy extraction device 10 will maintain a non-aerobraked condition with one of collar 36 pressing against compression spring 24.
  • Fig. 3 then represents an aerobraked position where the force of the gusting or overly high speed wind is pushing against concentrator wings 12 or turbine housing 14 or other elements and causing collar 36 to compress compression spring 24 and slide in a downwind direction towards flow regulator 18 thus closing the gap between the outlet of turbine shroud 14 and aerodynamic surfaces 50 of flow regulator 18.
  • the position of impellor 16 relative to the inlet of turbine shroud 14 in the non-aerobraked condition as illustrated by Fig's 2 and 4, and the aerobraked condition as illustrated by Fig's 3 and 5.
  • a catch mechanism (not illustrated) operating such that when compression spring 24 is compressed to some defined limit, this catch will not allow compression spring 24 to de ⁇ compress, and wind energy extraction device 10 will remain in an aerobraked condition until the catch is released. This may serve to further protect the moving elements in severe weather conditions.
  • Fig. 3 illustrates impellor 16 attaching to impellor driveshaft 26 that passes through and is free to rotate within driveshaft housing 38.
  • Impellor driveshaft 26 then enters flow regulator 18 that may also be used to house power converter 22, typically an alternator or generator, used to convert mechanical torque into usable electrical energy. It is an object of the present wind energy extraction device to remove power converter 22 from the high speed flow passing by impellor 16.
  • Prior wind turbines have been proposed where the alternator or generator must be faired in to minimize aerodynamic drag losses incurred by the necessary placement of these elements within the high speed wind flow.
  • Impellor driveshaft 22 of the present wind energy extraction device extends impellor 16 into the high speed flow of wind drawn through turbine shroud 14 and as well allows power converter 22 to be enclosed within or on the lee or leeward side of aerodynamic surfaces 50 of flow regulator 18 and out of this high speed wind flow. Aerodynamic surfaces 50 on the windward side of flow regulator 18 work to direct the wind flow outwards from flow regulator 18 and towards the wind flowing over concentrator wings 12 and cause the formation of a 'dead' or slower moving airspace on the leeward side of flow regulator 18. This dead airspace provides an ideal location for power converter 22 especially when housed within flow regulator 18 and protected from weather and other elements of the natural environment.
  • Downwind guidance 30 includes lee support 32, a mounting element that supports concentrator wings 12, flow regulator 18, and other elements of wind energy extraction device 10, and extends in a downwind direction into the slower moving wind flow on the leeward side of concentrator wings 12.
  • Lee support 32 then turns outward from the previously described central axis of wind flow and finally connects with swivel 34 that is mounted just forward of the center of wind pressure upon concentrator wings 12 and other elements of wind energy extraction device 10 to allow these elements to rotate about swivel 34 and be directed or preferably self-orient appropriately into the oncoming wind.
  • Swivel 34 best includes sealed roller bearings that permit low friction rotation of swivel 34 and ensure a long operational life in an outdoor environment.
  • Swivel 34 may also include a commutator plate (not illustrated) to conduct electrical power generated by power converter 22 through swivel 34 for further processing or utilization.
  • a commutator plate (not illustrated) to conduct electrical power generated by power converter 22 through swivel 34 for further processing or utilization.
  • care must also be taken to ensure that riser 42, which provides support to swivel 34 and as well extends elements of wind energy extraction device 10 into a freer unobstructed flow of wind, is mounted typically parallel to the local gravitational lines. Care must also be taken during design of embodiments of wind energy extraction device 10 to ensure that elements of wind energy extraction device 10 that are supported by swivel 34 are reasonably well balanced in a forward and aft direction to minimize any self-guidance error into the oncoming wind should riser 42 not be mounted exactly parallel to the local gravitational lines.
  • Foundation 44 supporting riser 42 and other elements of wind energy extraction device 10 should as well be designed to accommodate the highest forces of wind anticipated for the region of installation.
  • Fig. 7 as well indicates, by the use of arrows, the action of downwind guidance 30 around a common axis defined by swivel 34.
  • Fig. 8 illustrates an additional embodiment of a wind energy extraction device 10 that in this instance includes multiple impellors 16 and one or more power converters 22 (power converters 22 not visible in this view). Only a single power converter 22 is required for multiple impellors 16.
  • the impellors 16 may be connected via pulleys, a transmission, or any of a variety of means to a single power converter 22. For example, as shown in Fig. 11, three impellors 16 may be connected to a single power converter 22.
  • concentrator wings 12 that appear as straight sections rather than the curved sections of the previous figures. Swivel or swivels 34 are also indicated that as well serve to orient elements of wind energy extraction device 10 appropriately into the oncoming wind.
  • FIG. 8 Also of note in Fig. 8 is flow regulator 18 that runs, in this embodiment, the full length of multiple impellors 16, rather than only downwind of a single impellor 16 as illustrated in previous figures.
  • Impellor driveshafts 26 (not indicated in this view) as well extend from flow regulator 18 to position impellors 16 into the higher speed wind flowing through turbine shroud 14.
  • the function of turbine shroud 14 may as well be served by concentrator wings 12 in closest proximity to impellors 16.
  • Fig. 9 then illustrates a cross-section through the additional embodiment of wind energy extraction device 10 as introduced by Fig. 8. In this instance, and for additional clarity, two additional concentrator wings 12 serve as turbine shroud 14 as the aerodynamic elements in closest proximity to impellor 16.
  • Power converter 22 is also indicated in this view again located, as in previous figures, downwind, or on the opposite side of aerodynamic surfaces 50 of flow regulator 18.
  • the use of multiple power converters 22 and multiple impellors 16 has several important advantages. Relatively smaller impellors 16 allow higher operating rpm's which in turn allow power converters 22 to be directly driven and also operate at relatively higher rpm's. In general, higher rotating speed alternators or generators require fewer windings and are less costly in production. Another important aspect relates to overspeed protection. Clearly, where the number of impellors 16 and power converters 22 is increased relatively to some fixed area of wind capture, the work of converting the wind energy to usable electrical energy is shared and reduced for each individual impellor 16 and power converter 22.
  • the electrical or magnetic resistance of an alternator is familiar to most people who operate automobiles. When such a vehicle is idling and some additional electrical load is applied, such as headlamps, the engine may be experienced to idle down. This occurs as a result of the engine having to work harder to revolve the alternator that now applies a greater electrical or magnetic resistance in response to the greater demand made upon it to provide electricity to the headlamps. This same electrical or magnetic resistance may be applied to power converter 22 to produce additional electricity and at the same time control the rotational speed of power converter 22 in higher wind conditions.
  • riser 42 is also indicated in this view running downwind, or on the opposite side, of aerodynamic surfaces 50 of flow regulator 18. This is more than a convenient location for riser 42 as such a location allows riser 42 to support elements of wind energy extraction device 10 and at once to reduce aerodynamic drag losses that would otherwise be incurred by riser 42.
  • Alternate downwind guidance 46 therefore provides an alternate to downwind guidance 30 in this embodiment whereby alternate downwind guidance 46 includes riser 42 running downwind, or on the opposite side, of aerodynamic surfaces 50 of flow regulator 18 and as well includes swivel or swivels 34. Swivel 34, in this event, is preferably located sufficiently upwind, relative to other elements of wind energy extraction device 10, such that the forces of wind alone will cause elements of wind energy extraction device 10 to orient appropriately into the oncoming wind without motor drive or other assistance.
  • Fig. 10 provides two perspective views of an additional embodiment of wind energy extraction device 10.
  • the circular arrows serve to indicate the motion of alternate downwind guidance 46 as elements of wind energy extraction device 10 rotate about swivel or swivels 30 to face the oncoming wind.
  • Lamp 48 is also indicated in Fig. 10 to provide an example of configuring wind energy extraction device 10 as a dual use lamp standard and wind/electric generator, which may be used alongside a roadway such as along a city street, highway, or highway intersection, where lamp 48 is used to illuminate the roadway or roadway intersection and the wind/electric generator components to provide electricity to lamp 48 or to the electricity utility grid.
  • Riser 42, remaining stationary with respect to concentrator wings 12 permits the stationary mounting of lamp 48 irrespective of the wind direction or the orientation of concentrator wings 12 into the oncoming wind.
  • Fig. 11 provides an additional view of two of the wind energy extraction systems each having two sets of concentrator wings 12 and three impellors 16.
  • Fig. 11 also indicates insulator 50 mounted on top of riser 42, and transmission line 54 connecting the two wind energy extraction systems together and together with utility power pole 52.
  • Utility power pole 52 as illustrated permits interconnection with the electricity utility grid.
  • Riser 42 extending above concentrator wings 12 permits insulator 50 to carry transmission line 54 high above ground level. Again, riser 42 being stationary and independent of the orientation of concentrator wings 12 permits the stationary mounting of insulator 50 on top of riser 42.
  • the carriage of transmission line 54 high above ground level allows the passage of farm machinery under transmission lines 54 where installed on agricultural land, and avoids the additional costs and hazards of burying cable underground.
  • concentrator wings 12 The illustrations as well help to clarify the benefit of minimizing the diameter of the inlet to turbine shroud 14 and the diameter of impellor 16 relative to the larger diameters or capture areas of concentrator wings 12.
  • the larger diameter concentrator wings 12, or larger capture areas afforded by concentrator wings 12, allow wind energy extraction device 10 to capture and extract energy from a large area of wind relative to the frontal area of turbine shroud 14, and at the same time present a highly noticeable object to birds in flight.
  • Concentrator wings 12 may also be made more noticeable by application of contrasting colors, shades or patterns made on these elements for installations of embodiments of wind energy extraction device 10 within relatively featureless landscapes as are found within prairies or deserts.
  • markings and colorings may also improve the blending of embodiments of wind energy extraction device 10 within other highly textured natural landscapes without creating a hazard for birds in flight.
  • the wind turbines would appear to birds as a raised section or hill having the same textures as trees of the surrounding forest, and at the same time allow the wind turbines to visually blend into the forest landscape.
  • the smaller diameters of turbine shroud 14 easily lend to the screening over of the inlet to this element should this be proven necessary. In all likelihood however, this will not be necessary for the aforementioned reasons.
  • wind energy extraction device 10 due to the overall design of wind energy extraction device 10, and in particular to the introduction of aerobrake 20 and downwind guidance 30, and the relatively smaller impellor 16 and turbine shroud 14, design, production and maintenance costs and expenses may all be reduced relative to current wind turbine designs.
  • the terms of 'air' and 'wind' are used throughout this application to denote a fluid as it is understood and defined in the art and practice of fluid dynamics.
  • the primary intent of wind energy extraction device 10 is for the extraction of energy from wind, the principles and innovations may apply equally to the flow of other fluids, and in particular to flowing water, also considered abundant sources of naturally renewing energy.
  • the multiple impellor design also has utility where a single concentrator wing is used, although this design is not as efficient as the design where plural concentrator wings are used.

Abstract

L'invention porte sur un système d'extraction d'énergie éolienne à conversion de pression respectueux de l'habitat qui permet d'extraire en toute sécurité une énergie utilisable du vent. L'invention comprend un ou plusieurs carénages ou ailes de concentrateur qui convertissent la pression dynamique du vent en une pression statique relativement plus faible et qui, de la sorte, créent un vide qui attire le vent dans une turbine centralisée dans les carénages ou ailes de concentrateur. Les aubes de la turbine peuvent être significativement plus petites que les aubes de rotor à grand diamètre des conceptions répandues actuellement et peuvent par conséquent être placées à l'intérieur des carénages ou ailes de concentrateur qui constituent des objets hautement visibles et sont, en tant que tels, facilement évités par les oiseaux en vol. L'invention concerne en particulier un dispositif et un procédé de régulation d'écoulement d'air qui minimisent ou empêchent le blocage ou la production d'un flux de vent turbulent par-dessus ou entre les carénages ou les ailes de concentrateur de l'invention. Le blocage se produit lorsque le flux d'air s'accélère rapidement sous la force du vide et est aspiré hors de l'enveloppe de la turbine pour se mélanger avec le flux de vent régulier passant par-dessus ou entre les carénages ou ailes de concentrateur et en entraver l'écoulement homogène. Le système de l'invention peut également comprendre un aérofrein qui intervient rapidement afin de protéger les aubes de la roue ou les mécanismes associés contre les vitesses excessives ou d'autres limitations de conception dans des conditions de rafales ou de vent violent. L'invention peut aussi comprendre plusieurs autres aspects novateurs tels que des convertisseurs de puissance qui permettent d'étendre la ou les roues de turbine dans le vent accéléré s'écoulant librement, un aérofrein permettant de protéger la roue de turbine contre une vitesse excessive, et deux formes novatrices de systèmes de guidage dans le vent. L'invention concerne d'autres avantages et objets qui, en augmentant la sécurité et l'efficacité de l'extraction d'énergie éolienne, permettent d'installer l'invention de manière efficace dans des environnements urbains.
EP05767404A 2004-07-16 2005-07-15 Systeme d'extraction d'energie eolienne Withdrawn EP1778972A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/892,896 US7220096B2 (en) 2004-03-16 2004-07-16 Habitat friendly, multiple impellor, wind energy extraction
CA002501025A CA2501025C (fr) 2004-03-16 2005-03-16 Captation de l'energie du vent a turbines multiples adaptee a l'habitat
PCT/CA2005/001107 WO2006007696A1 (fr) 2004-07-16 2005-07-15 Systeme d'extraction d'energie eolienne

Publications (2)

Publication Number Publication Date
EP1778972A1 true EP1778972A1 (fr) 2007-05-02
EP1778972A4 EP1778972A4 (fr) 2011-01-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05767404A Withdrawn EP1778972A4 (fr) 2004-07-16 2005-07-15 Systeme d'extraction d'energie eolienne

Country Status (4)

Country Link
EP (1) EP1778972A4 (fr)
JP (1) JP4954066B2 (fr)
AU (1) AU2005263138C1 (fr)
WO (1) WO2006007696A1 (fr)

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EP2180181A1 (fr) * 2008-10-23 2010-04-28 Jia-Yuan Lee Structure de rotor d'une éolienne
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AU2005263138A2 (en) 2006-01-26
JP4954066B2 (ja) 2012-06-13
JP2008506877A (ja) 2008-03-06
AU2005263138C1 (en) 2011-11-03
AU2005263138B2 (en) 2011-05-26
WO2006007696A1 (fr) 2006-01-26
AU2005263138A1 (en) 2006-01-26

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