WO2012123968A2 - Système et procédé de montage d'une nacelle permettant la superposition/disposition en cascade de pales à profil aérodynamique d'une éolienne - Google Patents

Système et procédé de montage d'une nacelle permettant la superposition/disposition en cascade de pales à profil aérodynamique d'une éolienne Download PDF

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Publication number
WO2012123968A2
WO2012123968A2 PCT/IN2012/000172 IN2012000172W WO2012123968A2 WO 2012123968 A2 WO2012123968 A2 WO 2012123968A2 IN 2012000172 W IN2012000172 W IN 2012000172W WO 2012123968 A2 WO2012123968 A2 WO 2012123968A2
Authority
WO
WIPO (PCT)
Prior art keywords
turbine
nacelle
support plate
airfoil blade
rotor
Prior art date
Application number
PCT/IN2012/000172
Other languages
English (en)
Other versions
WO2012123968A3 (fr
Inventor
Raghunathan VALAGAM RAJAGOPAL
Original Assignee
Valagam Rajagopal Raghunathan
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 Valagam Rajagopal Raghunathan filed Critical Valagam Rajagopal Raghunathan
Publication of WO2012123968A2 publication Critical patent/WO2012123968A2/fr
Publication of WO2012123968A3 publication Critical patent/WO2012123968A3/fr

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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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • 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
    • F05B2240/14—Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within
    • 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
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/211—Rotors for wind turbines with vertical axis
    • F05B2240/214—Rotors for wind turbines with vertical axis of the Musgrove or "H"-type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02E10/728—Onshore wind turbines

Definitions

  • This invention relates to the wind turbine with the state of art method of enabling stacking of the airfoil blades by means of system and method of placing nacelle over the turbine.
  • the existing wind turbines have the airfoil blades mounted on the rotor which creates wobbling while the turbine is being operated and generates stress on the tower and turbine structures. Although it can be avoided to some extent by sturdier design it is accomplished at the expense of material cost.
  • the present invention of inverted mounting the nacelle over the turbine reduces the wobbling action besides enhancing the structural support to the turbine. Also, it paves the way if required, in multi stage for stacking of the airfoil blade(s) one over the other thereby enabling the design of turbine to be modularized and further bring flexibility to the design of vertical axis wind turbines
  • a wind turbine is the revolutionary invention for the generation of electricity from the alternate or renewable energy resources thereby achieving the sustainable development which is the need at present to preserve the ecosystem.
  • a wind turbine is a device for converting the kinetic energy in wind into the mechanical energy of a rotating shaft. Usually that rotating mechanical energy is converted immediately by a generator into electrical energy. In the large turbines, there is generally a generator on top of the tower. The generator is usually connected to the turbine shaft through gears which turn the generator at a different speed than the turbine shaft.
  • Fancy power electronic controls convert the electricity into the correct frequency and voltage to feed intolhe power grid.
  • the first law of thermodynamics tells us the energy out of the wind turbine over a certain amount of time (power) has to equal the energy that went into the turbine during the same amount of time (also power).
  • the "energy in” is the kinetic energy from the wind's velocity and air density that flows into the area swept by the turbine blade(s). It is not possible to convert all of the wind's kinetic energy into mechanical energy. Some energy must remain in the air leaving the turbine.
  • the "energy out” is the energy converted by the turbine blades into mechanical energy (which is then usually turned into electricity), plus whatever energy is left in the air after it passes through the turbine rotors.
  • a component of lift force causes rotor rotation and a component of drag force opposes rotation.
  • the rotor torque will be positive as long as the driving component of the lift force exceeds the opposing component of the drag force.
  • auxiliary device such as a nacelle must be employed to start the system.
  • the integral piece of a wind turbine is the wind turbine nacelle, also known as the generator. This is the piece that is turned by the windmill blade(s) to generate power.
  • U.S Pat. No. 5252029 to Barnes discloses a wind turbine which includes a vertically extending hollow rotor shaft mounted on a support structure with two, three or four rotor blades of troposkein configuration on the rotor shaft for rotating the shaft in response to wind energy and thereby drive a generator to produce electrical power.
  • the turbine includes an erection hinge and gin pole which permits the turbine to be cable hoisted using a simple winch mounted at or bear ground level.
  • An additional set of guy wires are provided to hold the central support structure and lower bearing in a vertical position.
  • U.S Pat. No: 4204805 to Bolie discloses a method comprising of rotating assembly attached to central hub, which is supported for rotation in a horizontal plane about a vertical axis, in a bearing on top of the tower of selected elevation.
  • the rotating assembly comprises at least two radial spokes or arms positioned from each other at equal angles in a horizontal plane.
  • the outer ends of the arms are attached to a connector assembly which generally is in the form of a u-shaped member lying in a vertical plane.
  • the above invention concerns the structural problems of vertical axis windmills.
  • a system and method for mounting the nacelle in an inverted position over the turbine with the aid of guy wires for cost effective method of power generation is mounted over the turbine and is supported by guy wires from the base.
  • the nacelle is fixed to the support plate which is held in place by means of guy wires from the base.
  • the bearing mounted beneath the nacelle accommodates for the misalignment and minimizes the friction.
  • the nacelle provides structural support to the tower and turbine structure and also it prevents the turbine from inducing a wobbling effect which may develop undesirable stress on the rotor and the tower.
  • the position of nacelle enables provision of stacking the airfoil blade(s) one above the other in case of any need, to enhance the generation of power.
  • the present invention besides modularizing the design of turbine also ensures structural stability to the tower and turbine structure by reducing the wobbling action in an economical manner, without incurring the further expense of material.
  • the stress is minimized by means of mounting the nacelle at an inverted position over the turbine
  • the arms (3), said arms for holding the airfoil blade(s) (1) are attached to the rotor (2).
  • the tower (4) said tower for housing the turbine ( " I ) along with the totor (2) and to withstand against the wind.
  • the nacelle (5) said nacelle for driving the turbine (T) and to receive the power generated from the turbine (T).
  • the nacelle support plate (6) said plate supporting the nacelle for preventing the nacelle from rotating along with the turbine (T).
  • G. The guy wires (7), said guy wire's one end is anchored to the support plate (6) and whose other end at the anchor enables holding the support plate (6) in position.
  • the airfoil blade(s) attached to the rotor by means of arms tends to sag and it induces a wobbling effect which develops stress on the tower and turbine structure.
  • the stress developed and the wobbling of turbine is further increased.
  • the present invention minimizes the stress by mounting the nacelle above the turbine and reduces the wobbling effect which is the factor for development of stress. Since the nacelle is mounted above the turbine, it paves the way for stacking the airfoil blades without any undesirable factors like wobbling and thereby the power generation can be increased economically.
  • Wind turbine generates power by the kinetic energy of approaching wind which causes the rotation of airfoil blade(s).
  • the generation of the power can be increased by many factors provided the swept area is increased by them.
  • the power generation can be increased. So, the airfoil blades are cascaded or stacked one above the other as per the need and thereby the power generation can be increased which is said to be stacking of airfoil blade(s). It is well known that the generation of power from the wind turbine will increase with the increase in stages of blades since the swept area is increased accordingly.
  • the turbine When the turbine is mounted on the nacelle in the existing cases, the turbine is supported freely and it is subjected to sagging which tends to increase while it is being operated.
  • the turbine mounted on the tower acts like a cantilever beam with the weight of the turbine acting as lateral point load on the structure. So the turbine tends to wobble during its operation due to the misalignment of the rotating components which may develops undesirable stress, bending moment and noise. The above phenomenon is said to be wobbling of turbine.
  • the present invention discloses method of mounting the nacelle on the turbine at inverted position thereby enabling stacking the airfoil blade(s).
  • the stacking of airfoil blade(s) comprises of two modes. A. Single stage mode
  • the turbine is mounted on the tower with the nacelle mounted at inverted position with the airfoil blade(s) in a single stage.
  • the nacelle is fixed with the support plate which is held in place by means of guy wires.
  • the guy wires anchored at the base at one end and to the support plate at the other prevents the rotation of nacelle and transmits vibration while the turbine is being operated.
  • the airfoil blade(s) mounted below the nacelle is mounted in a single stage as per the need of the power.
  • the turbine is mounted on the tower with the nacelle mounted at inverted position with the airfoil blade(s) in a multi stage.
  • the turbine is mounted on the tower with the nacelle mounted at inverted position with the airfoil blade(s) in a multi stage.
  • the method of mounting the nacelle on the turbine at inverted position thereby mounting the airfoil blade(s) in single stage comprises of:
  • the method of mounting the nacelle on the turbine at inverted position and the airfoil blades in multi stage comprises of:
  • Fig.1 illustrates the method of mounting the nacelle at inverted position deployed using the nacelle mounting system as embodied in the present invention, with the generation of power from single stage airfoil blade(s).
  • Fig.2 illustrates the method of mounting the nacelle at inverted position deployed using the nacelle mounting system as embodied in the present invention ,with the generation of power from multi stage airfoil blade(s) inclusive of, stacked or cascaded airfoil blades.
  • Fig.3 illustrates a block diagram showing the steps involved in the method of mounting the nacelle over the turbine at inverted position and enabling the airfoil blade(s) to be mounted in single or multi stage, said multi stage being inclusive of, stacked or cascaded airfoil blades resulting in generation of power air.
  • Fig.1 illustrates the method of mounting the nacelle at inverted position with the generation of power from single stage airfoil blades deployed using the nacelle mounting system.
  • the stacking of airfoil blade(s) comprises of two modes.
  • the airfoil blades (1) in single stage is mounted on the arms (3) and attached to the rotor (2).
  • the nacelle (5) is mounted at inverted position over the turbine (T) and is held in place by the nacelle support plate or truss (6).
  • the nacelle support plate (6) is anchored to the base by means of guy wires (7).
  • the bearing is mounted for the smooth rotation of the turbine (T) and to accommodate the misalignment while the turbine is being operated.
  • the position of the nacelle at the inverted position enhances the structural stability of the turbine (T) and it brings modularity to its design. It also prevents discrepancies like wobbling which is the source for the development of stress.
  • Fig.2 illustrates the method of mounting the nacelle at inverted position with the generation of power in multi-stage mode from stacked or cascaded airfoil blade(s) deployed using the nacelle mounting system.
  • the airfoil blades (1) are cascaded one above the other to generate more power by enhancing the swept area. But, cascading of airfoil blades (1) leads to sagging of the blades (1) which induce stresses in the structure and wobbling in the turbine (T).
  • Fig.3 illustrates a block diagram showing the steps involved in generation of power from single stage or multi stage inclusive of stacked/cascaded airfoil blade(s) with the nacelle mounted at inverted position.
  • the method of mounting the nacelle on the turbine at inverted position and the airfoil blades in single or multi stage comprises of:
  • the turbine mounted on the tower (4) acts like a cantilever beam with a lateral point load (weight of turbine) at its end which generates enormous bending moment and the deflection of the entire structure.
  • the cantilever effect will cause the turbine to sag and which generate stresses and also it tends to wobble which enhance the stress gradually.
  • the present invention overcomes this drawback by mounting the nacelle (5) at inverted position over the turbine rather than mounting it beneath the turbine (T).
  • the nacelle (5) mounted at inverted position is supported by nacelle support plate or truss (6) which is anchored to the ground at the anchor by means of guy wires.
  • the nacelle is held in place by means of the guy wires and it provides structural support to the nacelle. Since the nacelle is mounted over the turbine and is held in place by guy wires(7), lateral movement of tower(4) and the turbine is minimized or avoided and the tower(4) is subjected to axial load alone which makes the tower(4) more rigid.
  • the present invention paves the way for the stacking or cascading of airfoil blade(s) (1) whenever there is a need to enhance the generation of power from the turbine (T) thereby the design of turbine can be modularized.
  • the airfoil blade(s) (1) can be stacked or cascaded but still does not induce wobbling or stress so that the more power can be generated from the turbine as desired.

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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

L'invention concerne un système et un procédé de montage d'une nacelle (5) au-dessus d'une turbine (T) en position inversée et la génération d'énergie par superposition de pales (1) à profil aérodynamique les unes au-dessus des autres. L'éolienne et le rotor (2) sont montés sur le pylône au moyen de paliers permettant de compenser tout défaut d'alignement axial. La nacelle (5) en position inversée est montée au-dessus de la turbine (T) plutôt qu'en dessous de la turbine. Une plaque support (6) porte la nacelle (5) et transmet les vibrations de la nacelle (5) au sol au moyen de haubans (7). Le rotor (2) comporte des espaces pour la superposition des pales (1) à profil aérodynamique afin de générer une plus grande quantité d'énergie en fonction des besoins. Les haubans (7) étant ancrés au sommet de la turbine à la plaque portant la nacelle ou l'armature (6), les oscillations de la turbine (T) sont considérablement réduites, améliorant ainsi la rigidité de la structure.
PCT/IN2012/000172 2011-03-14 2012-03-13 Système et procédé de montage d'une nacelle permettant la superposition/disposition en cascade de pales à profil aérodynamique d'une éolienne WO2012123968A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN767CH2011 2011-03-14
IN767/CHE/2011 2011-03-14

Publications (2)

Publication Number Publication Date
WO2012123968A2 true WO2012123968A2 (fr) 2012-09-20
WO2012123968A3 WO2012123968A3 (fr) 2012-11-22

Family

ID=46168569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2012/000172 WO2012123968A2 (fr) 2011-03-14 2012-03-13 Système et procédé de montage d'une nacelle permettant la superposition/disposition en cascade de pales à profil aérodynamique d'une éolienne

Country Status (1)

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WO (1) WO2012123968A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204805A (en) 1978-03-28 1980-05-27 Bolie Victor W Vertical axis wind turbine
US5252029A (en) 1991-09-13 1993-10-12 Barnes Robert J Vertical axis wind turbine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2247929A (en) * 1939-08-19 1941-07-01 Cornelius F Terhune Windmill
US3918839A (en) * 1974-09-20 1975-11-11 Us Energy Wind turbine
DE2644557A1 (de) * 1976-10-02 1978-04-06 Fawwaz Said Windturbine
GB2017230B (en) * 1978-03-28 1982-07-07 Hayes M R Transverse flow turbines
US4334823A (en) * 1980-12-16 1982-06-15 Sharp Peter A Wind or fluid current turbine
US5171127A (en) * 1988-12-23 1992-12-15 Alexander Feldman Vertical axis sail bladed wind turbine
US6784566B2 (en) * 2001-01-25 2004-08-31 Robert Nason Thomas Coupled vortex vertical axis wind turbine
FR2872552B1 (fr) * 2004-07-02 2009-02-20 Vimak Soc Civ Ile Eolienne a axe vertical

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204805A (en) 1978-03-28 1980-05-27 Bolie Victor W Vertical axis wind turbine
US5252029A (en) 1991-09-13 1993-10-12 Barnes Robert J Vertical axis wind turbine

Also Published As

Publication number Publication date
WO2012123968A3 (fr) 2012-11-22

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