US20120134820A1 - Fluid Turbine Having Optimized Blade Pitch Profiles - Google Patents
Fluid Turbine Having Optimized Blade Pitch Profiles Download PDFInfo
- Publication number
- US20120134820A1 US20120134820A1 US12/954,886 US95488610A US2012134820A1 US 20120134820 A1 US20120134820 A1 US 20120134820A1 US 95488610 A US95488610 A US 95488610A US 2012134820 A1 US2012134820 A1 US 2012134820A1
- Authority
- US
- United States
- Prior art keywords
- rotor blade
- axis
- pitch angle
- rotor
- rotation
- 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.)
- Abandoned
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 238000011144 upstream manufacturing Methods 0.000 claims 3
- 238000003491 array Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor
- F03D3/06—Rotors
- F03D3/062—Rotors characterised by their construction elements
- F03D3/066—Rotors characterised by their construction elements the wind engaging parts being movable relative to the rotor
- F03D3/067—Cyclic movements
- F03D3/068—Cyclic movements mechanically controlled by the rotor structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D7/00—Rotors with blades adjustable in operation; Control thereof
-
- 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
- F05B2260/00—Function
- F05B2260/50—Kinematic linkage, i.e. transmission of position
-
- 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
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/72—Adjusting of angle of incidence or attack of rotating blades by turning around an axis parallel to the rotor centre line
-
- 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
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/79—Bearing, support or actuation arrangements therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/50—Kinematic linkage, i.e. transmission of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05D2260/72—Adjusting of angle of incidence or attack of rotating blades by turning around an axis parallel to the rotor centre line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05D2260/79—Bearing, support or actuation arrangements therefor
-
- 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
- Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
Definitions
- the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle.
- the fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation.
- the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle.
- TPL circumferential tangent path line
- the fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation to a third pitch angle at a third circumferential location about the axis of rotation.
- the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle.
- TPL circumferential tangent path line
- the fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation to a third pitch angle at a third circumferential location about the axis of rotation to a fourth pitch angle at a fourth circumferential location about the axis of rotation.
- FIG. 1 is an isometric view of a fluid turbine according to certain embodiments of the present disclosure
- FIG. 2 is an end view of a fluid turbine according to certain embodiments of the present disclosure
- FIG. 3 is a graph of five profiles of rotor blade pitch ( ⁇ ) vs. rotor blade position ( ⁇ ) about the central axis of rotation of the turbine;
- FIG. 4 is a table showing, for each of the five profiles in FIG. 3 , the rotor blade pitch ( ⁇ ) at ten distinct blade positions about the central axis of rotation of the turbine.
- FIG. 1 is an isometric view of a fluid turbine 100 according to certain embodiments of the present disclosure.
- turbine 100 consists of a rotor assembly comprising a torque tube 104 riding on bearings 106 mounted on a frame 102 .
- Torque tube 104 is designed to prevent each rotor hub 108 from rotating independently of the other rotor hubs 108 .
- Torque tube 104 is oriented along a central axis which is intended to be disposed generally perpendicular to the direction of fluid flow.
- the turbine 100 comprises arrays of radially-disposed struts 110 mounted to rotor hubs 108 at their proximal ends and to a set of rotor blades 112 at their distal ends.
- the rotor blades 112 shown in FIG. 1 are high aspect ratio airfoils/hydrofoils having a clearly defined leading and trailing edge.
- Turbine 100 shown in FIG. 1 comprises 10 blades, but alternate embodiments may have more or fewer blades, depending on the application.
- the rotor blades 112 are attached to the struts 110 in such a manner as to allow the rotor blades 112 to be individually pivoted with respect to the circumferential tangent path line of turbine 100 , thus altering the pitch angle of each rotor blade 112 as turbine 100 rotates.
- the angle of the rotor blades may be controlled via mechanical linkages, hydraulics, pneumatics, linear or rotary electromechanical actuators, or any combination thereof.
- the rotor pitch angle profile may be controlled by a cam-and-follower mechanism operating in concert with one or more of the above systems of actuation.
- a cam-and-follower mechanism operating in concert with one or more of the above systems of actuation.
- a set of cam followers ride along a surface of a centrally-located cam.
- the profile of at least one surface of the cam defines the pitch profile or pitch schedule for the rotor blades.
- FIG. 2 is an end view of a fluid turbine 100 according to certain embodiments of the present disclosure.
- the fluid turbine 100 shown in FIG. 2 incorporates ten rotor blades 112 .
- the pitch angle of the ten rotor blades 112 are designated angles A-J with the blade pitch angle of the rotor blade at angular position 0 being designated angle “A”.
- the blade pitch angles of the other rotor blades 112 are designated angles “B” through “J”, at multiples of 36 degrees from angle “A”, counter-clockwise.
- angle “B” is the pitch angle of a rotor blade 112 disposed at an angular position 36 degrees counter-clockwise from
- angle “C” is the pitch angle of a rotor blade 112 disposed at an angular position 72 degrees from 0, and so forth.
- turbine 100 incorporates at least one mechanism to vary the blade pitch according to angular position as a rotor blade 112 moves around the rotational axis of the turbine 100 .
- the pattern or profile of blade pitch vs. angular position may vary depending on a number of factors, including but not limited to rotor velocity and free stream fluid velocity. Thus, it may be desirable to modify the blade pitch profile as conditions change.
- a blade pitch value of zero in FIG. 4 represents the condition wherein chord line is aligned with the circumferential tangent path line of the blade, while a positive value represents the condition wherein the nose of the blade is disposed in toward the axis of rotation of the turbine and a negative value represents the condition wherein the nose of the blade is disposed out away from the axis of rotation of the turbine.
- FIG. 3 is a graph of five profiles of rotor blade pitch (theta) vs. rotor blade position (psi) about the central axis of rotation of the rotor.
- the profiles are designated “Profile 1 ,” “Profile 2 ,” “Profile 3 ,” “Profile 4 ” and “Profile 5 .”
- Profiles 1 through 5 are non-sinusoidal profiles, although each incorporates certain sinusoidal attributes.
- Angular positions A-J about the axis of rotation of the rotor are designated by the appropriate letters and correspond to the positions shown in FIG. 2 .
- a blade pitch value of zero represents the condition wherein the blade chord is aligned tangent to the circumferential path line along which the blade moves.
- This alignment may also be described as one lying normal to a vector from the axis of rotation of the rotor to the pitch axis of the rotor blade.
- a positive value represents the condition wherein the nose of the blade is disposed in toward the axis of rotation of the turbine, while a negative value represents the condition wherein the nose of the blade is disposed out away from the axis of rotation of the turbine.
- FIG. 4 is a table showing, for each of the five profiles shown in FIG. 3 , the rotor blade pitch (theta) at the ten distinct blade positions A-J about the central axis of rotation of the turbine.
- Angular positions A-J set forth in FIG. 4 correspond to the angular positions shown in FIG. 2 about the axis of rotation of the rotor.
Abstract
Description
- According to a first embodiment, the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle. The fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation.
- According to a second embodiment, the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle. The fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation to a third pitch angle at a third circumferential location about the axis of rotation.
- According to a third embodiment, the present disclosure relates to a fluid turbine comprising a rotor, having an axis of rotation, comprising at least two rotor blades disposed at a radius from the axis of rotation, moving along a circumferential tangent path line (TPL), each rotor blade having a pitch axis and a variable pitch angle. The fluid turbine further comprises a mechanism operable to control the pitch angle of at least one rotor blade about its pitch axis and to vary the pitch angle of the rotor blade from a first pitch angle at a first circumferential location about the axis of rotation to a second pitch angle at a second circumferential location about the axis of rotation to a third pitch angle at a third circumferential location about the axis of rotation to a fourth pitch angle at a fourth circumferential location about the axis of rotation.
-
FIG. 1 is an isometric view of a fluid turbine according to certain embodiments of the present disclosure; -
FIG. 2 is an end view of a fluid turbine according to certain embodiments of the present disclosure; -
FIG. 3 is a graph of five profiles of rotor blade pitch (Θ) vs. rotor blade position (Ψ) about the central axis of rotation of the turbine; and -
FIG. 4 is a table showing, for each of the five profiles inFIG. 3 , the rotor blade pitch (Θ) at ten distinct blade positions about the central axis of rotation of the turbine. - A system and method of the present patent application will now be described with reference to various examples of how the embodiments can best be made and used. Like reference numerals are used throughout the description and several views of the drawings to indicate like or corresponding parts, wherein the various elements are not necessarily drawn to scale.
-
FIG. 1 is an isometric view of afluid turbine 100 according to certain embodiments of the present disclosure. Structurally,turbine 100 consists of a rotor assembly comprising atorque tube 104 riding on bearings 106 mounted on aframe 102.Torque tube 104 is designed to prevent eachrotor hub 108 from rotating independently of theother rotor hubs 108.Torque tube 104 is oriented along a central axis which is intended to be disposed generally perpendicular to the direction of fluid flow. Theturbine 100 comprises arrays of radially-disposedstruts 110 mounted torotor hubs 108 at their proximal ends and to a set ofrotor blades 112 at their distal ends. Therotor blades 112 shown inFIG. 1 are high aspect ratio airfoils/hydrofoils having a clearly defined leading and trailing edge.Turbine 100 shown inFIG. 1 comprises 10 blades, but alternate embodiments may have more or fewer blades, depending on the application. Therotor blades 112 are attached to thestruts 110 in such a manner as to allow therotor blades 112 to be individually pivoted with respect to the circumferential tangent path line ofturbine 100, thus altering the pitch angle of eachrotor blade 112 asturbine 100 rotates. The angle of the rotor blades may be controlled via mechanical linkages, hydraulics, pneumatics, linear or rotary electromechanical actuators, or any combination thereof. In certain embodiments, the rotor pitch angle profile may be controlled by a cam-and-follower mechanism operating in concert with one or more of the above systems of actuation. According to one such mechanism, a set of cam followers ride along a surface of a centrally-located cam. The profile of at least one surface of the cam defines the pitch profile or pitch schedule for the rotor blades. -
FIG. 2 is an end view of afluid turbine 100 according to certain embodiments of the present disclosure. Thefluid turbine 100 shown inFIG. 2 incorporates tenrotor blades 112. The pitch angle of the tenrotor blades 112 are designated angles A-J with the blade pitch angle of the rotor blade atangular position 0 being designated angle “A”. The blade pitch angles of theother rotor blades 112 are designated angles “B” through “J”, at multiples of 36 degrees from angle “A”, counter-clockwise. Thus, angle “B” is the pitch angle of arotor blade 112 disposed at anangular position 36 degrees counter-clockwise from 0, angle “C” is the pitch angle of arotor blade 112 disposed at anangular position 72 degrees from 0, and so forth. - Because of the fact that the angle between a
rotor blade 112 and the fluid flow will vary as therotor blade 112 moves around the axis of rotation of theturbine 100, the optimal pitch angle for torque generation will vary accordingly as thatrotor blade 112 moves around the axis of rotation. In order to optimize the angle between the blade pitch and the fluid flow,turbine 100 disclosed herein incorporates at least one mechanism to vary the blade pitch according to angular position as arotor blade 112 moves around the rotational axis of theturbine 100. The pattern or profile of blade pitch vs. angular position may vary depending on a number of factors, including but not limited to rotor velocity and free stream fluid velocity. Thus, it may be desirable to modify the blade pitch profile as conditions change. - As described above, those of skill in the art will recognize that a blade pitch value of zero in
FIG. 4 represents the condition wherein chord line is aligned with the circumferential tangent path line of the blade, while a positive value represents the condition wherein the nose of the blade is disposed in toward the axis of rotation of the turbine and a negative value represents the condition wherein the nose of the blade is disposed out away from the axis of rotation of the turbine. -
FIG. 3 is a graph of five profiles of rotor blade pitch (theta) vs. rotor blade position (psi) about the central axis of rotation of the rotor. The profiles are designated “Profile 1,” “Profile 2,” “Profile 3,” “Profile 4” and “Profile 5.”Profiles 1 through 5 are non-sinusoidal profiles, although each incorporates certain sinusoidal attributes. Angular positions A-J about the axis of rotation of the rotor are designated by the appropriate letters and correspond to the positions shown inFIG. 2 . Those of skill in the art will recognize that a blade pitch value of zero represents the condition wherein the blade chord is aligned tangent to the circumferential path line along which the blade moves. This alignment may also be described as one lying normal to a vector from the axis of rotation of the rotor to the pitch axis of the rotor blade. As above, a positive value represents the condition wherein the nose of the blade is disposed in toward the axis of rotation of the turbine, while a negative value represents the condition wherein the nose of the blade is disposed out away from the axis of rotation of the turbine. -
FIG. 4 is a table showing, for each of the five profiles shown inFIG. 3 , the rotor blade pitch (theta) at the ten distinct blade positions A-J about the central axis of rotation of the turbine. Angular positions A-J set forth inFIG. 4 correspond to the angular positions shown inFIG. 2 about the axis of rotation of the rotor. Those of skill in the art will appreciate that the angles depicted inFIG. 4 are certain specific angles which have been shown to be useful within the context of the present disclosure. Those of skill in the art will also appreciate that similar profiles to those shown and described will be useful within the context of the present disclosure. - It is believed that the operation and construction of the embodiments of the present patent application will be apparent from the Detailed Description set forth above. While the exemplary embodiments shown and described may have been characterized as being preferred, it should be readily understood that various changes and modifications could be made therein without departing from the scope of the present invention as set forth herein.
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/954,886 US20120134820A1 (en) | 2010-11-28 | 2010-11-28 | Fluid Turbine Having Optimized Blade Pitch Profiles |
PCT/US2011/062271 WO2012071591A1 (en) | 2010-11-28 | 2011-11-28 | Fluid turbine having optimized blade pitch profiles |
US14/070,474 US20150125298A1 (en) | 2010-11-28 | 2013-11-01 | Fluid turbine for power generation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/954,886 US20120134820A1 (en) | 2010-11-28 | 2010-11-28 | Fluid Turbine Having Optimized Blade Pitch Profiles |
Publications (1)
Publication Number | Publication Date |
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US20120134820A1 true US20120134820A1 (en) | 2012-05-31 |
Family
ID=46126790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/954,886 Abandoned US20120134820A1 (en) | 2010-11-28 | 2010-11-28 | Fluid Turbine Having Optimized Blade Pitch Profiles |
Country Status (2)
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US (1) | US20120134820A1 (en) |
WO (1) | WO2012071591A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100322769A1 (en) * | 2008-02-25 | 2010-12-23 | Thomas Glenn Stephens | Fluid turbine optimized for power generation |
US10648448B2 (en) * | 2016-05-24 | 2020-05-12 | Wonki YOO | Tidal current generator |
US11005321B2 (en) | 2017-10-30 | 2021-05-11 | Petr Chmelicek | Motor |
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US4180367A (en) * | 1975-02-10 | 1979-12-25 | Drees Herman M | Self-starting windmill energy conversion system |
US4383801A (en) * | 1981-03-02 | 1983-05-17 | Pryor Dale H | Wind turbine with adjustable air foils |
US4408956A (en) * | 1981-11-27 | 1983-10-11 | Price Sr William F | Flip-flop turbine vane module |
US4494007A (en) * | 1982-09-02 | 1985-01-15 | Gaston Manufacturing, Inc. | Wind machine |
US5503525A (en) * | 1992-08-12 | 1996-04-02 | The University Of Melbourne | Pitch-regulated vertical access wind turbine |
US6379115B1 (en) * | 1999-08-02 | 2002-04-30 | Tetsuo Hirai | Windmill and windmill control method |
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US7665966B2 (en) * | 2004-04-16 | 2010-02-23 | Ventus Spolka ZO.O | Flow-controlled wind rotor |
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-
2010
- 2010-11-28 US US12/954,886 patent/US20120134820A1/en not_active Abandoned
-
2011
- 2011-11-28 WO PCT/US2011/062271 patent/WO2012071591A1/en active Application Filing
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US4115027A (en) * | 1976-01-16 | 1978-09-19 | Robert Nason Thomas | Vertical windmill |
US4383801A (en) * | 1981-03-02 | 1983-05-17 | Pryor Dale H | Wind turbine with adjustable air foils |
US4408956A (en) * | 1981-11-27 | 1983-10-11 | Price Sr William F | Flip-flop turbine vane module |
US4494007A (en) * | 1982-09-02 | 1985-01-15 | Gaston Manufacturing, Inc. | Wind machine |
US5503525A (en) * | 1992-08-12 | 1996-04-02 | The University Of Melbourne | Pitch-regulated vertical access wind turbine |
US6379115B1 (en) * | 1999-08-02 | 2002-04-30 | Tetsuo Hirai | Windmill and windmill control method |
US6688842B2 (en) * | 2002-06-24 | 2004-02-10 | Bruce E. Boatner | Vertical axis wind engine |
US6926491B2 (en) * | 2003-05-12 | 2005-08-09 | Bernard Migler | Vertical axis wind turbine with controlled gybing |
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US7780411B2 (en) * | 2006-02-15 | 2010-08-24 | Yan Qiang | Device and method for adjusting angle-of-attack of wind blades in lift-type vertical axis wind turbine |
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US20080247872A1 (en) * | 2007-01-22 | 2008-10-09 | Lonestar Inventions Lp | Method of Operation of a High-Efficiency Turbine With Variable Attack Angle Foils |
US20100084863A1 (en) * | 2008-10-03 | 2010-04-08 | Noel Richard Potter | Variable vane vertical axis wind turbine |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100322769A1 (en) * | 2008-02-25 | 2010-12-23 | Thomas Glenn Stephens | Fluid turbine optimized for power generation |
US10648448B2 (en) * | 2016-05-24 | 2020-05-12 | Wonki YOO | Tidal current generator |
US11005321B2 (en) | 2017-10-30 | 2021-05-11 | Petr Chmelicek | Motor |
US11095175B2 (en) | 2017-10-30 | 2021-08-17 | Romax Technology Limited | Motor |
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WO2012071591A1 (en) | 2012-05-31 |
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