CN1997822A - Wind turbine comprising elastically flexible rotor blades - Google Patents

Wind turbine comprising elastically flexible rotor blades Download PDF

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Publication number
CN1997822A
CN1997822A CNA2005800190005A CN200580019000A CN1997822A CN 1997822 A CN1997822 A CN 1997822A CN A2005800190005 A CNA2005800190005 A CN A2005800190005A CN 200580019000 A CN200580019000 A CN 200580019000A CN 1997822 A CN1997822 A CN 1997822A
Authority
CN
China
Prior art keywords
wind
rotor blade
rotor
driven generator
blade
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.)
Pending
Application number
CNA2005800190005A
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Chinese (zh)
Inventor
S·西格弗里德森
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.)
Aerodyn Engineering GmbH
Original Assignee
Aerodyn Engineering GmbH
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 Aerodyn Engineering GmbH filed Critical Aerodyn Engineering GmbH
Publication of CN1997822A publication Critical patent/CN1997822A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • 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
    • F05B2240/2022—Rotors with adjustable area of intercepted fluid by means of teetering or coning 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
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/221—Rotors for wind turbines with horizontal axis
    • F05B2240/2213—Rotors for wind turbines with horizontal axis and with the rotor downwind from the yaw pivot axis
    • 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
    • F05B2240/311—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 flexible or elastic
    • 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
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/50—Intrinsic material properties or characteristics
    • F05B2280/5001—Elasticity
    • 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
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6003—Composites; e.g. fibre-reinforced
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/02—Elasticity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/04—Composite, e.g. fibre-reinforced
    • 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

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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

The invention relates to a wind turbine comprising a tower (10), a nacelle (14) that is mounted on the tower (10) and can be rotated about the axis of the latter and a rotor (16), which is carried by the nacelle (14) on the lee side and comprises at least one rotor blade (18). The flexural strength of the rotor blade or blades (18) permits the elastic flexure of said blade by more than half of its extension.

Description

Wind-driven generator with elastically flexible rotor blades
Technical field
The present invention relates to a kind of wind-driven generator, this wind-driven generator has a pylon, a cabin and a rotor, this cabin is installed in also can be around its rotational on the pylon, this rotor has at least one rotor blade, and this rotor blade is installed on the cabin and with respect to pylon in rotary manner and rotates on lee face.
Background technique
For decades recently, wind generating technology develops very rapidly, but only relates to the very large power station of average-size of the running that is used to be incorporated into the power networks.Yet since nearest 20 years, the development of the small power generation system in kilowatt scope is progress not.Therefore, generator is still very expensive, and does not therefore come into the market.Wind-power electricity generation can not be played the part of an important role aspect the people of electricity consumption in supply 2,000,000,000.For this situation, be starved of the generator of 1-10 kw of power level, but these generators must be very firm, not expensive, be easy to set up and almost maintenance-free.
Yet existing small generator can not satisfy these requirements, because they are too expensive and/or break down too easily.Because generator must be designed to stand very large wind-force (typhoon, hurricane), therefore produced a specific problem.On the design wind speed to 70 meter per seconds.Under such wind speed, generator slows down and stops.
In order to realize this purpose, more known settling modes, wherein, rotor blade rotates around its longitudinal axis, thereby reduces shearing force.In other generator type, by a wind vane or by a transmit device, whole cabin is owing to wind rotates, and whole rotor forms helicopter mode.One common feature of all these settling modes is that they are all very expensive and break down easily, so they are unsuitable for using widely.Same be suitable for be, must use very firm blade to bear very high loads for generator, also be like this for whole generating machine and ground.
D.B.P. discloses a kind of wind-driven generator with an elastically flexible rotor blades for 29880145U1 number.
Summary of the invention
Problem of the present invention provides a kind of wind-driven generator of aforementioned type, and wherein the load that will limit owing to the blast under extreme wind condition is applied to whole wind-driven generator structure.
According to the present invention, this problem solves by making up at least one rotor blade, and this rotor blade has the flexural strength along the blade profile of application of force direction, allows rotor blade with half and elastic deflection greater than its whole length.In a preferable development form, the flexural strength of rotor blade allows with the deflection greater than its double length.
Rotor blade is permanently attached to hub and need not to adjust by bearing or joint, this is particularly advantageous, thereby the tendency that fault is taken place minimizes.
Because this significant deflection has at first significantly reduced outstanding wind action face, secondly significantly reduced resistance coefficient because the blade relevant with bending or deflection is significant outwardly-bent.Because these two effects under extreme wind condition, are compared with those generators that use rigid blade, the shearing force of the wind on the whole generating machine can reduce half.This has saved the material that is used for the load transfer parts, and therefore these load transfer parts such as rotor shafts, casing, vertical bearing, pylon, anchoring piece and ground have significantly reduced the cost of production of whole generating machine.
By using thin air mechanics contour, and use the high strength material of low elastic modulus simultaneously, can make significant deflection.Even under significant deflection, the stress and strain of the material of permission is not excessively therefore.The relative profile thickness of preferable use, i.e. the complete ratio of profile thickness and complete profile depth is between 0.05-0.15.
One preferable development form is characterised in that on the length of whole blade, profile thickness and profile depth are constant.For at least one rotor blade that is a fibrous composite profile that squeezes out, this development form is possible.If fibrous composite is a fiberglass plastic composite material, satisfied requirement for the simultaneously low relatively Young's modulus of high strength.
Brief description of drawings
Hereinafter will be referred to four accompanying drawings and describe the present invention in more detail, wherein shown:
One side view of Fig. 1 wind-driven generator of the present invention, and rotor blade is not crooked, and wind direction is by shown in the arrow.
The view that Fig. 2 is corresponding with Fig. 1, and generator slows down, rotor blade by especially big wind bending.
The contour structure of the rotor blade that Fig. 3 one squeezes out, and wind is from the below among the figure, and application of force direction is S.
Fig. 4 has shown the amount of deflection D of a rotor blade with respect to length of blade B under different wind speed.
Embodiment
Fig. 1 has shown the wind-driven generator with pylon 10 and pylon anchoring piece 12.Cabin 14 is positioned to can be around the rotational of pylon 10.Rotor 16 has been installed in cabin 14, and this rotor 16 is at lee face---being the side of pylon 10 away from wind---goes up rotation.When static under the condition of rotor at limited wind-force and generator still operated, blade is deflection or only deflection a little not.Blade is with a cone angle, and---promptly being arranged to tilt along wind direction---is mounted to hub, and therefore when operated generator, the shearing force of centrifugal force and wind can cause roughly not having bending moment at root of blade.For the wind speed greater than cut-off velocity, generator slows down and stops.
Fig. 2 has shown the generator in the deceleration regime under great wind speed.Because the shearing of wind, the blade deflection its total length 2/3rds.Because this significant deflection has reduced the load of wind, significantly because reduced wind action face.In addition, because the remarkable inclination of blade is compared with flow direction, reduced the resistance coefficient of profile.
Fig. 3 has shown an air mechanics contour that approaches, and this profile has one about 8% relative profile thickness, and promptly largest contours thickness 20 is 0.08 with respect to the value of profile depth.Therefore section of outline has a limited rigidity at the action direction of power, and the load of wind can be at the remarkable curved vane of the action direction of power.
Fig. 4 has shown the amount of deflection of the flexible rotor blade that changes with wind speed in vogue.A kind of mode that can be such is selected flexural strength: under the wind speed of 70 meter per seconds, allow blade with whole blade length 70% and elastic deflection.

Claims (7)

1. wind-driven generator, have a pylon (10), a cabin (14) and a rotor (16), this cabin (14) is positioned at described pylon (10) thereby goes up around its rotational, this rotor (16) has at least one rotor blade (18), this rotor blade (18) turns round on lee face and is supported by cabin (14), it is characterized in that the flexural strength of described at least one rotor blade (18) allows to come elastic deflection greater than half of its total length.
2. wind-driven generator as claimed in claim 1 is characterized in that, the flexural strength of described rotor blade allows to come deflection greater than 2/3rds of its total length.
3. wind-driven generator as claimed in claim 1 or 2 is characterized in that, described rotor blade can not be connected to described hub with adjusting.
4. wind-driven generator as claimed in claim 1 or 2 is characterized in that, described profile thickness (20) and profile depth (22) are constant on described length of blade.
5. wind-driven generator as claimed in claim 4 is characterized in that, profile thickness is 5-15% relatively.
6. as claim 4 or 5 described wind-driven generators, it is characterized in that described at least one rotor blade is a synthetic fiber profile that squeezes out.
7. wind-driven generator as claimed in claim 6 is characterized in that, described at least one rotor blade comprises the profile that squeezes out of a glass fiber reinforced plastic.
CNA2005800190005A 2004-09-18 2005-09-05 Wind turbine comprising elastically flexible rotor blades Pending CN1997822A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045401A DE102004045401A1 (en) 2004-09-18 2004-09-18 Wind energy plant with elastically flexible rotor blades
DE102004045401.9 2004-09-18

Publications (1)

Publication Number Publication Date
CN1997822A true CN1997822A (en) 2007-07-11

Family

ID=35431363

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2005800190005A Pending CN1997822A (en) 2004-09-18 2005-09-05 Wind turbine comprising elastically flexible rotor blades

Country Status (5)

Country Link
US (1) US20070098555A1 (en)
EP (1) EP1789677A1 (en)
CN (1) CN1997822A (en)
DE (1) DE102004045401A1 (en)
WO (1) WO2006029593A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104343643A (en) * 2014-09-24 2015-02-11 王东明 Lift type elastic synergistic windmill blade

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US7582977B1 (en) * 2005-02-25 2009-09-01 Clipper Windpower Technology, Inc. Extendable rotor blades for power generating wind and ocean current turbines within a module mounted atop a main blade
US8430636B2 (en) * 2007-12-05 2013-04-30 Thomas V. Wagner Wind turbine rotor assembly
GB2470589A (en) * 2009-05-29 2010-12-01 Vestas Wind Sys As Branching spar wind turbine blade
US8596978B2 (en) * 2009-11-25 2013-12-03 Pioneer Energy Products, Llc Wind turbine
GB2484148A (en) * 2010-10-02 2012-04-04 Duncan James Parfitt Windmill with apertured flexible vanes
US9709029B2 (en) 2011-06-21 2017-07-18 University Of Virginia Patent Foundation Morphing segmented wind turbine and related method
WO2013001647A1 (en) * 2011-06-30 2013-01-03 学校法人文理学園 Propeller windmill for comapact electricity generating machine
DE102014204591B3 (en) 2014-03-12 2015-04-02 Voith Patent Gmbh Bidirectional flowable horizontal rotor turbine with passive overload protection
US9509036B2 (en) 2015-03-05 2016-11-29 Pioneer Energy Products, Llc Communications units with high capacity low profile antenna arrangements
CN111173676A (en) * 2020-02-19 2020-05-19 扬州大学 Leeward type wind turbine

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FR2345600A1 (en) * 1975-06-09 1977-10-21 Bourquardez Gaston FLUID BEARING WIND TURBINE
DE2546884A1 (en) * 1975-10-20 1977-04-21 Goslich Hans Dietrich Wind operated turbine for power production - has blades pivoted on pins to limit axial bending moments
US4366387A (en) * 1979-05-10 1982-12-28 Carter Wind Power Wind-driven generator apparatus and method of making blade supports _therefor
DE3126692A1 (en) * 1980-12-17 1983-02-10 Hilarius 4300 Essen Drzisga Wind turbine
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104343643A (en) * 2014-09-24 2015-02-11 王东明 Lift type elastic synergistic windmill blade
CN104343643B (en) * 2014-09-24 2017-01-25 王东明 Lift type elastic synergistic windmill blade

Also Published As

Publication number Publication date
DE102004045401A1 (en) 2006-03-30
EP1789677A1 (en) 2007-05-30
US20070098555A1 (en) 2007-05-03
WO2006029593A1 (en) 2006-03-23

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C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
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Open date: 20070711