WO1994004820A1 - Windmill, wing for such a mill, and add-on element to be mounted on a mill wing - Google Patents

Windmill, wing for such a mill, and add-on element to be mounted on a mill wing Download PDF

Info

Publication number
WO1994004820A1
WO1994004820A1 PCT/DK1993/000279 DK9300279W WO9404820A1 WO 1994004820 A1 WO1994004820 A1 WO 1994004820A1 DK 9300279 W DK9300279 W DK 9300279W WO 9404820 A1 WO9404820 A1 WO 9404820A1
Authority
WO
WIPO (PCT)
Prior art keywords
wing
wings
mill
effect
actuator means
Prior art date
Application number
PCT/DK1993/000279
Other languages
French (fr)
Inventor
Hans Ullersted
Per Hansen
Arne Nielsen
Original Assignee
Hans Ullersted
Per Hansen
Arne Nielsen
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 Hans Ullersted, Per Hansen, Arne Nielsen filed Critical Hans Ullersted
Priority to AU49447/93A priority Critical patent/AU4944793A/en
Publication of WO1994004820A1 publication Critical patent/WO1994004820A1/en

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
    • F03D7/0256—Stall control
    • 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
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/325—Air temperature
    • 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

  • Windmill wing for such a mill, and add-on element to be mounted on a mill wing.
  • the present invention relates to a common type windmill, i.e. with a wing-carrying rotor, the wings of which are rotated by means of an existing wind ac ⁇ tuation.
  • a distinction is made differen ⁇ tiating between mills with fixed and turnably adjustable wings, respectively, and the invention relates in par ⁇ ticular to rotors with fixed wings.
  • maximum effect is meant the greatest possible exploitation of the existing wind at low wind velocity up to the point where the effect gained is commensurate with the maximum effect the mill is design ⁇ ed to produce.
  • the wings are automatically turned about their longitudinal axis such that their efficiency is reduced in order to safeguard the mill against overload.
  • the wing rotor When the wing rotor is coupled to an AC generator the rotor speed will be reasonably constant in a large part of the wind velocity area.
  • the wings move in a direction directly transversely to the wind direction and, in consequence, the inclination angle of the ensu ⁇ ing air flow on the wings depends on the wind force.
  • the wings in question are stall-regulated, viz. they are profiled such that, in the said strong wind velocity area, they display increased stalling the stronger the wind is, thusly avoiding the said overload condition.
  • a mill wing adjustment is chosen corresponding to high temperature operation for fully effective wings, whilst, by means of temperature sensors and coupled actuator means, a re ⁇ duction of the wing efficiency at decreasing temperature is undertaken.
  • This reduction may be induced in dif ⁇ ferent ways, e.g. through an operative local deformation of sections of the wings; through controlled alteration of the angle position of the wings; or through controll ⁇ ed alteration of the effective wing surface area.
  • the mill in hot weather may operate at an increased stall-wind velocity, i.e. hot, forceful winds may be exploited better without risking overload if or when the temperature is low.
  • the wings will be more or less inefficient, but this is of no consequence as long as they are able to continue to operate at the determined maximum effect.
  • a marked energy gain is attainable, at least 2-3% or more, depending on local conditions, and furthermore, it will eliminate the need to execute the said summer and wintertime operational service adjustments.
  • the wings may be arranged with telescope-like fixed wing tips which are kept retracted at low temperatures, but which are unfolded outwards gradually in step with ris ⁇ ing temperatures. This also ensures that an optimizing of the wings occurs without risking overload.
  • the wings may be turned slightly for a suitable change of the effective inclination angle, which should be reduced the colder the air is, such that the wings will stall at an even earlier point.
  • the wings may still retain the fixed-wing characteristics, since all it takes is for a turning joint and a temperature-sensitive rotation actuator to be placed between the wing blade and the wing base.
  • a combination of various regulation means may be implimented, as required, depending on the desired de ⁇ gree of accuracy in the effect equalization between high and low air temperatures.
  • Fig. 1 is a perspective view of a windmill with an arrangement according to the invention.
  • Figs. 2 and 3 are sectional views of a wing with the arrangement depicted in two different positions.
  • Figs. 4 and 5 are corresponding views to illustrate another embodiment of the arrangement according to the invention.
  • Fig. 6 is a longitudinal sectional view of same
  • Fig. 7 is a front view of a wing according to yet another embodiment of the invention.
  • Fig. 8 is a schematic perspective view of a third embodiment of the invention.
  • the mill illustrated in Fig. l is of a type having fixed, i.e. non-adjustable wings 2, and according to the invention these are made with some specific, schemati ⁇ cally illustrated front edge areas 4. These may be inte ⁇ grated areas; however, as depicted on the lefthand side of the view, add-on units 6 could be considered which are shaped to fit onto the wing front edge and may be fixated to this, e.g. by gluing means.
  • Figs. 2 and 3 are shown in a cross sectional view. It consists of a semi-rigid, pre ⁇ ferably rubber elastic material 8 which, when mounted, forms an aerodynamic extension of the wing front edge. Embedded in the material are some heat-expanding elements 10, which are illustrated in Fig. 2 in a "hot" state, e.g. at 40°C, where the profile surface exhibits its ordinary, effective form. In Fig. 2, the elements 10 are depicted at a relatively low temperature for the
  • a longitudinal, V-shaped front edge rail 14 which is displaceable in its longisudinal direction by means of a temperature responsive actuator 16 of a known type, and which is wedge-supported against a rigid rail 18 such that the rail 14 will remain in its retracted position, at high temperatures, as shown in Fig. 4, whilst, at low temperatures, it will assume a projecting position, as shown in Fig. 5.
  • the rail 14 may be kept in place by the frontwise positioned, slotted part of the member material 8 which will merely curve outwards ela- stically when the rail 14 is guided into its projecting position.
  • the rail 18 form the displaceable element by means of which an I-shaped rail 14 may be displaced forwards and backwards in a straight line, and the actuator 16 is preferably placed behind the rail 18 whereby the element 6 may remain active practically throughout its entire length.
  • a tip exten ⁇ sion will manifest itself, in terms of area, as the square on the extension and will thusly be effective for even a modest displacement.
  • the wings are normally dimensioned or adapted in correlation with the low temperatures where the impact is the strongest, but where it, in consequence, becomes necessary to relinquish the extra effect which will not be exploitable at high tempera ⁇ tures without the special thermal control arrangement.
  • Such an embodiment with a projectable wing tip is il lustrated in Fig. 7 where the wing tip portion 20 covers the fixed wing tip and is projectable to the shown position marked by dotted lines, in that a tempe ⁇ rature-sensitive actuator 22 is placed inside the wing or optionally in the very wing tip portion 20.
  • Fig. 8 illustrates that the wing 2, at its base portion 24, may be turnably lodged in a socket 26 which supports the wing mounting flange 28.
  • a socket 26 which supports the wing mounting flange 28.
  • a radial peg 32 extends and is connected to the base portion 24.
  • the extreme end of this peg is coupled to a driving rod on a thermal actua ⁇ tor 34 which is firmly connected to the socket 26.
  • Fol ⁇ lowing this, the wing blade 2 is turnably adjusted ac ⁇ cording to the temperature, e.g. by a 1-3° angle so that the inclination angle is increased the hotter the tem ⁇ perature is.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

Generally speaking, stall-regulated mill blades have a lower propulsive effect at higher than at lower temperatures because the air density at any given wind velocity is lower, the higher the temperature is. This condition is critical at the stall-wind velocity where the mill produces the maximum effect at which it is designed to perform. If the wings are regulated for maximum performance at high temperatures, then overload will occur at low temperature stall-wind velocity conditions. In consequence, the wings are normally adjusted to low temperature conditions, in return for which it becomes necessary to relinquish the maximun effect at high temperatures. With the invention, an air temperature sensor (10, 16, 22, 34) is provided which by means of connected actuator means (14, 20, 32) can change the wing structure such that the wing becomes generally less effective at decreasing temperatures. Hereby it is possible to increase the effect of the mill, in that it will be able to better exploit the high wind velocity at high temperatures without incurring problems at low temperatures in terms of overload.

Description

Windmill, wing for such a mill, and add-on element to be mounted on a mill wing.
The present invention relates to a common type windmill, i.e. with a wing-carrying rotor, the wings of which are rotated by means of an existing wind ac¬ tuation. In practice, a distinction is made differen¬ tiating between mills with fixed and turnably adjustable wings, respectively, and the invention relates in par¬ ticular to rotors with fixed wings.
It is previously known that, at the design of the mills, it must be taken into consideration that, at a given wind velocity, a lower effect will be produced the hotter the air is because the air density of hot air is less than that of cold air.
This problem is dealt with in mills having turnably adjustable wings by fully automatic means, in that the wings are automatically turned for maximum effect under the existing conditions thus making super¬ fluous any considerations as to the level of the air temperature.
By "maximum effect" is meant the greatest possible exploitation of the existing wind at low wind velocity up to the point where the effect gained is commensurate with the maximum effect the mill is design¬ ed to produce. At higher wind velocity, the wings are automatically turned about their longitudinal axis such that their efficiency is reduced in order to safeguard the mill against overload.
Less expensive mills with fixed wings may achieve a similar degree of safety through an adequate profiling of the wing, viz. such that the wings are fully ef¬ fective at the wind velocity which generally corresponds to the maximum effect, whilst they become less effective the stronger the wind is. This may be arranged in such a way that the wings, over a comparatively large strong wind velocity area, may produce a rather uniform, albeit normally slightly decreasing "maximum effect", until the wind becomes so forceful that the wings stall, i.e. losing completely their propulsive power. The forceful winds could be exploited to give off a very high effect, but if these only occur, e.g. during 5% of the time, then it would be uneconomical to dimension the mill to utilize this energy.
When the wing rotor is coupled to an AC generator the rotor speed will be reasonably constant in a large part of the wind velocity area. The wings move in a direction directly transversely to the wind direction and, in consequence, the inclination angle of the ensu¬ ing air flow on the wings depends on the wind force. The wings in question are stall-regulated, viz. they are profiled such that, in the said strong wind velocity area, they display increased stalling the stronger the wind is, thusly avoiding the said overload condition.
It then quite naturally follows to adjust the wings to perform at maximum effect at cold air temperatures. If the temperature rises at a given air velocity, the effect will consequently drop, but this poses no risk for the mill, whilst it would pose a substantial over¬ load risk at decreasing temperature if the wings were pre-adjusted to maximum performance at high temperature.
In professional circles, this condition is fully realiz ed, in that it is well-known that the fixed wings are only fixed in the sense that they still remain turn¬ ably adjustable when alternating between summer and winter operation, such that during the warmer summertime operation they may still perform at maximum effect without incurring the risk of overload. The re-adjust¬ ments do, however, incur a noticeable increased work load, not least in large windmill parks.
Through the present invention, it is realized that these conditions may be changed such that it becomes feasible to obtain a comprehensive equalization between the output effect at high and low temperatures, re¬ spectively. According to the invention, a mill wing adjustment is chosen corresponding to high temperature operation for fully effective wings, whilst, by means of temperature sensors and coupled actuator means, a re¬ duction of the wing efficiency at decreasing temperature is undertaken. This reduction may be induced in dif¬ ferent ways, e.g. through an operative local deformation of sections of the wings; through controlled alteration of the angle position of the wings; or through controll¬ ed alteration of the effective wing surface area.
This means that the mill in hot weather may operate at an increased stall-wind velocity, i.e. hot, forceful winds may be exploited better without risking overload if or when the temperature is low. In cold weather, the wings will be more or less inefficient, but this is of no consequence as long as they are able to continue to operate at the determined maximum effect. On an annual basis, a marked energy gain is attainable, at least 2-3% or more, depending on local conditions, and furthermore, it will eliminate the need to execute the said summer and wintertime operational service adjustments.
In practice, to obtain the lowtemperature reduction of effect it has been found more expedient to use a thermally operated front edge spoiler causing a change of the wing profile itself over a partial length of the wings.
As another option it should be mentioned that the wings may be arranged with telescope-like fixed wing tips which are kept retracted at low temperatures, but which are unfolded outwards gradually in step with ris¬ ing temperatures. This also ensures that an optimizing of the wings occurs without risking overload.
As mentioned above it will be an additional option for the wings to be turned slightly for a suitable change of the effective inclination angle, which should be reduced the colder the air is, such that the wings will stall at an even earlier point. The wings may still retain the fixed-wing characteristics, since all it takes is for a turning joint and a temperature-sensitive rotation actuator to be placed between the wing blade and the wing base.
A combination of various regulation means may be implimented, as required, depending on the desired de¬ gree of accuracy in the effect equalization between high and low air temperatures.
In the following, the invention is explained further with reference to the drawing, in which:
Fig. 1 is a perspective view of a windmill with an arrangement according to the invention.
Figs. 2 and 3 are sectional views of a wing with the arrangement depicted in two different positions.
Figs. 4 and 5 are corresponding views to illustrate another embodiment of the arrangement according to the invention.
Fig. 6 is a longitudinal sectional view of same,
Fig. 7 is a front view of a wing according to yet another embodiment of the invention, and
Fig. 8 is a schematic perspective view of a third embodiment of the invention.
The mill illustrated in Fig. l is of a type having fixed, i.e. non-adjustable wings 2, and according to the invention these are made with some specific, schemati¬ cally illustrated front edge areas 4. These may be inte¬ grated areas; however, as depicted on the lefthand side of the view, add-on units 6 could be considered which are shaped to fit onto the wing front edge and may be fixated to this, e.g. by gluing means.
One of these units 6 is shown in Figs. 2 and 3 in a cross sectional view. It consists of a semi-rigid, pre¬ ferably rubber elastic material 8 which, when mounted, forms an aerodynamic extension of the wing front edge. Embedded in the material are some heat-expanding elements 10, which are illustrated in Fig. 2 in a "hot" state, e.g. at 40°C, where the profile surface exhibits its ordinary, effective form. In Fig. 2, the elements 10 are depicted at a relatively low temperature for the
* actual place of the installation, e.g. 10°C, whereby the elements are contracted such as to form local indents 12
' on the outer facade of the elements. This will incur a certain, albeit insignificant disturbance of the laminar air flow along the wing profile causing a slight reduc¬ tion of the wing efficiency.
In the system shown in figs. 4 through 6, use is made of a longitudinal, V-shaped front edge rail 14 which is displaceable in its longisudinal direction by means of a temperature responsive actuator 16 of a known type, and which is wedge-supported against a rigid rail 18 such that the rail 14 will remain in its retracted position, at high temperatures, as shown in Fig. 4, whilst, at low temperatures, it will assume a projecting position, as shown in Fig. 5. The rail 14 may be kept in place by the frontwise positioned, slotted part of the member material 8 which will merely curve outwards ela- stically when the rail 14 is guided into its projecting position. In practice, it is preferred, however, to let the rail 18 form the displaceable element by means of which an I-shaped rail 14 may be displaced forwards and backwards in a straight line, and the actuator 16 is preferably placed behind the rail 18 whereby the element 6 may remain active practically throughout its entire length.
It will be appreciated that there is an infinite variety of possibilities with which to achieve the dis¬ cussed effect that, in general terms, is linked to such > current wing adjustments, through which the wing is adapted to exploit the air in the high temperature scale area better, using a factual control responsive to a probing of the actual temperature. This may be taken one or several steps further than described so far in that, e.g. one option could be to bring forth an extension of the wing length at high temperatures, whether this hap¬ pens by way of a telescopic extension of the base con¬ nection of the wings with the mill hub or by using ex¬ ternal tip portions which may be operated telescopically to an external position resulting in an increase of the effective sweep area of the rotating wings. A tip exten¬ sion will manifest itself, in terms of area, as the square on the extension and will thusly be effective for even a modest displacement. Here, it still applies that, for safety reasons, the wings are normally dimensioned or adapted in correlation with the low temperatures where the impact is the strongest, but where it, in consequence, becomes necessary to relinquish the extra effect which will not be exploitable at high tempera¬ tures without the special thermal control arrangement.
Such an embodiment with a projectable wing tip is il lustrated in Fig. 7 where the wing tip portion 20 covers the fixed wing tip and is projectable to the shown position marked by dotted lines, in that a tempe¬ rature-sensitive actuator 22 is placed inside the wing or optionally in the very wing tip portion 20.
Fig. 8 illustrates that the wing 2, at its base portion 24, may be turnably lodged in a socket 26 which supports the wing mounting flange 28. In the socket is a slot 30 through which a radial peg 32 extends and is connected to the base portion 24. The extreme end of this peg is coupled to a driving rod on a thermal actua¬ tor 34 which is firmly connected to the socket 26. Fol¬ lowing this, the wing blade 2 is turnably adjusted ac¬ cording to the temperature, e.g. by a 1-3° angle so that the inclination angle is increased the hotter the tem¬ perature is.

Claims

C L A I M S :
1. Windmill, preferably of the type arranged with fixed and stall-regulated wings, i.e. non-turnably ad¬ justable during operation, characterized in that a sens¬ ing device to gauge air temperatures is operatively coupled to actuator means for changing the wing charac¬ teristics such that the wings are adapted to bring forth a higher effect at a given wind velocity, the higher the temperature is, and a lesser effect the colder the tem¬ perature is, respectively, ideally such that at any temperature, and in particular at the highest and the lowest operative wind velocity, the natural tendency of the wings to procude an increased effect at colder tem peratures will be compensated for.
2. Mill according to claim 1 characterized in that the actuator means are constituted by thermally operated control means to change the wing profile over at least a partial stretch of the wing length.
3. Mill according to claim 1 characterized in that the actuator means are constituted by means for increas¬ ing the effective wing length, e.g. by extending ou¬ twards telescopically arranged wing tip portions.
4. Mill according to claim 1 characterized in that the actuator means are constituted by means for turning the wing blades in order to change their pitch by thermal control.
5. Mill according to claim 1 characterized in that the sensing device is of a mechanically operative type positioned on each individual wing and directly linked up with the actuator means on the same wing.
6. Mill according to claim 2, characterized in that the actuator means are constituted by means for reducing the wing effect through more or less advanced deforma¬ tion of the front edge wing areas.
7. Mill according to claim 2 characterized in that the wings are standard adjusted for producing maximum effect at low temperatures, and in that the actuator means are arranged so as to remain passive at low tempe¬ ratures, but increasingly active at rising temperatures
8. Mill wing for a mill according to claim 1' cha¬ racterized in that it is arranged in compliance with any of the claims 2 through 6.
9. Add-on element to be mounted on the wings of the type claimed in claim 1, characterized in that the ele¬ ment is made in compliance with any of the claims 2 through 6.
10. Element according to claim 9 characterized in that it is shaped to be fixated onto the wing front edge area, preferably by glue.
PCT/DK1993/000279 1992-08-26 1993-08-26 Windmill, wing for such a mill, and add-on element to be mounted on a mill wing WO1994004820A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49447/93A AU4944793A (en) 1992-08-26 1993-08-26 Windmill, wing for such a mill, and add-on element to be mounted on a mill wing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK921059A DK105992D0 (en) 1992-08-26 1992-08-26 TEMPERATURE DEPENDENT WINDOW POWER CONTROLLER WITH FIXED WINGS AESTALL REGULATOR
DK1059/92 1992-08-26

Publications (1)

Publication Number Publication Date
WO1994004820A1 true WO1994004820A1 (en) 1994-03-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000279 WO1994004820A1 (en) 1992-08-26 1993-08-26 Windmill, wing for such a mill, and add-on element to be mounted on a mill wing

Country Status (3)

Country Link
AU (1) AU4944793A (en)
DK (1) DK105992D0 (en)
WO (1) WO1994004820A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308867A (en) * 1995-12-05 1997-07-09 John Arthur Howard Automatic wind turbine control
WO2001086142A1 (en) * 2000-05-06 2001-11-15 Aloys Wobben Wind power plant with a particle sensor
WO2002068818A1 (en) * 2001-02-28 2002-09-06 Aloys Wobben Atmospheric density-dependent power adjustment for wind turbines
US6966758B2 (en) 2000-06-19 2005-11-22 Lm Glasfiber A/S Wind turbine rotor blade comprising one or more means secured to the blade for changing the profile thereof depending on the atmospheric temperature
DE102005014884B3 (en) * 2005-04-01 2006-09-14 Nordex Energy Gmbh Rotor blade, for a wind turbine, is of a plastics material with fiber reinforcements of a different thermal expansion to alter the aerodynamic profile shape on a temperature change
CN101825070A (en) * 2010-06-04 2010-09-08 西安交通大学 Blade structure for wind driven generator
WO2010120595A1 (en) * 2009-04-13 2010-10-21 Frontier Wind, Llc Variable length wind turbine blade having transition area elements
US20120141271A1 (en) * 2011-09-13 2012-06-07 General Electric Company Actuatable spoiler assemblies for wind turbine rotor blades
US20150098820A1 (en) * 2013-10-09 2015-04-09 Siemens Aktiengesellchaft Method and apparatus for reduction of fatigue and gust loads on wind turbine blades

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Publication number Priority date Publication date Assignee Title
US3096828A (en) * 1961-12-04 1963-07-09 Standard Thomson Corp Fluid control apparatus
US4297076A (en) * 1979-06-08 1981-10-27 Lockheed Corporation Wind turbine
GB2140508A (en) * 1983-05-25 1984-11-28 Howden James & Co Ltd Wind turbines
GB2157774A (en) * 1984-04-26 1985-10-30 Lawson Tancred Sons & Company Wind turbine blades
SU1332069A1 (en) * 1986-04-02 1987-08-23 Н.А.Шихайлов и В.В.Душин Windwill speed governor

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US3096828A (en) * 1961-12-04 1963-07-09 Standard Thomson Corp Fluid control apparatus
US4297076A (en) * 1979-06-08 1981-10-27 Lockheed Corporation Wind turbine
GB2140508A (en) * 1983-05-25 1984-11-28 Howden James & Co Ltd Wind turbines
GB2157774A (en) * 1984-04-26 1985-10-30 Lawson Tancred Sons & Company Wind turbine blades
SU1332069A1 (en) * 1986-04-02 1987-08-23 Н.А.Шихайлов и В.В.Душин Windwill speed governor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 88-90337/13, week 8813; & SU,A,1 332 069 (SHIKHAILOV N A), 23 August 1987. *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308867A (en) * 1995-12-05 1997-07-09 John Arthur Howard Automatic wind turbine control
WO2001086142A1 (en) * 2000-05-06 2001-11-15 Aloys Wobben Wind power plant with a particle sensor
AU775450B2 (en) * 2000-05-06 2004-07-29 Aloys Wobben Wind power plant with a particle sensor
US6837681B2 (en) 2000-05-06 2005-01-04 Aloys Wobben Wind power plant with a particle sensor
US6966758B2 (en) 2000-06-19 2005-11-22 Lm Glasfiber A/S Wind turbine rotor blade comprising one or more means secured to the blade for changing the profile thereof depending on the atmospheric temperature
WO2002068818A1 (en) * 2001-02-28 2002-09-06 Aloys Wobben Atmospheric density-dependent power adjustment for wind turbines
US7023105B2 (en) 2001-02-28 2006-04-04 Aloys Wobben Atmospheric density-dependent power adjustment for wind turbines
EP1707806A2 (en) 2005-04-01 2006-10-04 NORDEX ENERGY GmbH Rotor blade for a wind turbine
DE102005014884B3 (en) * 2005-04-01 2006-09-14 Nordex Energy Gmbh Rotor blade, for a wind turbine, is of a plastics material with fiber reinforcements of a different thermal expansion to alter the aerodynamic profile shape on a temperature change
WO2010120595A1 (en) * 2009-04-13 2010-10-21 Frontier Wind, Llc Variable length wind turbine blade having transition area elements
US8206107B2 (en) 2009-04-13 2012-06-26 Frontier Wind, Llc Variable length wind turbine blade having transition area elements
CN101825070A (en) * 2010-06-04 2010-09-08 西安交通大学 Blade structure for wind driven generator
CN101825070B (en) * 2010-06-04 2012-11-28 西安交通大学 Blade structure for wind driven generator
US20120141271A1 (en) * 2011-09-13 2012-06-07 General Electric Company Actuatable spoiler assemblies for wind turbine rotor blades
CN102996331A (en) * 2011-09-13 2013-03-27 通用电气公司 Actuatable spoiler assemblies for wind turbine rotor blades
US20150098820A1 (en) * 2013-10-09 2015-04-09 Siemens Aktiengesellchaft Method and apparatus for reduction of fatigue and gust loads on wind turbine blades
US9689374B2 (en) * 2013-10-09 2017-06-27 Siemens Aktiengesellschaft Method and apparatus for reduction of fatigue and gust loads on wind turbine blades

Also Published As

Publication number Publication date
AU4944793A (en) 1994-03-15
DK105992D0 (en) 1992-08-26

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