US20120134820A1 - Fluid Turbine Having Optimized Blade Pitch Profiles - Google Patents

Fluid Turbine Having Optimized Blade Pitch Profiles Download PDF

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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
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Prior art keywords
rotor blade
axis
pitch angle
rotor
rotation
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Abandoned
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US12/954,886
Inventor
Robert Clifton Vance
Jason Daniel Cormey
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Broadstar Investment Co LLC
Original Assignee
Broadstar Investment Co LLC
Broadstar Wind Systems Group LLC
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Publication date
Application filed by Broadstar Investment Co LLC, Broadstar Wind Systems Group LLC filed Critical Broadstar Investment Co LLC
Priority to US12/954,886 priority Critical patent/US20120134820A1/en
Assigned to BROADSTAR WIND SYSTEMS GROUP reassignment BROADSTAR WIND SYSTEMS GROUP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CORMEY, JASON D., VANCE, ROBERT C.
Priority to PCT/US2011/062271 priority patent/WO2012071591A1/en
Assigned to BROADSTAR INVESTMENT COMPANY, LLC reassignment BROADSTAR INVESTMENT COMPANY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BROADSTAR WIND SYSTEMS GROUP, LLC
Assigned to CONNECTICUT DEVELOPMENT AUTHORITY reassignment CONNECTICUT DEVELOPMENT AUTHORITY PATENT COLLATERAL ASSIGNMENT AND SECURITY AGREEMENT Assignors: BROADSTAR INVESTMENT COMPANY, LLC
Assigned to BROADSTAR ENERGY CORPORATION reassignment BROADSTAR ENERGY CORPORATION SECURITY AGREEMENT Assignors: BROADSTAR INVESTMENT COMPANY LLC, ENHANCED CAPITAL CONNECTICUT FUND I, LLC, ENHANCED CAPITAL CONNECTICUT FUND II, LLC, ENHANCED CAPITAL CONNECTICUT FUND III, LLC
Publication of US20120134820A1 publication Critical patent/US20120134820A1/en
Priority to US14/070,474 priority patent/US20150125298A1/en
Abandoned legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D3/00Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06Rotors
    • F03D3/062Rotors characterised by their construction elements
    • F03D3/066Rotors characterised by their construction elements the wind engaging parts being movable relative to the rotor
    • F03D3/067Cyclic movements
    • F03D3/068Cyclic movements mechanically controlled by the rotor structure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D7/00Rotors with blades adjustable in operation; Control thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00Function
    • F05B2260/50Kinematic linkage, i.e. transmission of position
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00Function
    • F05B2260/70Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/72Adjusting of angle of incidence or attack of rotating blades by turning around an axis parallel to the rotor centre line
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00Function
    • F05B2260/70Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/79Bearing, support or actuation arrangements therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/50Kinematic linkage, i.e. transmission of position
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/70Adjusting of angle of incidence or attack of rotating blades
    • F05D2260/72Adjusting of angle of incidence or attack of rotating blades by turning around an axis parallel to the rotor centre line
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/70Adjusting of angle of incidence or attack of rotating blades
    • F05D2260/79Bearing, support or actuation arrangements therefor
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/74Wind 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

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, each rotor blade having a pitch axis and a variable pitch angle. The fluid turbine 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 between various pitch angles as the blade moves radially about the axis of rotation of the rotor.

Description

    SUMMARY OF THE INVENTION
  • 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.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • 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 in FIG. 3, the rotor blade pitch (Θ) at ten distinct blade positions about the central axis of rotation of the turbine.
  • DETAILED DESCRIPTION OF THE DRAWINGS
  • 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 a fluid turbine 100 according to certain embodiments of the present disclosure. Structurally, 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. 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 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. Thus, angle “B” is the pitch angle of a rotor blade 112 disposed at an angular position 36 degrees counter-clockwise from 0, angle “C” is the pitch angle of a rotor blade 112 disposed at an angular 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 the rotor blade 112 moves around the axis of rotation of the turbine 100, the optimal pitch angle for torque generation will vary accordingly as that rotor 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 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.
  • 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 in FIG. 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 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. Those of skill in the art will appreciate that the angles depicted in FIG. 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)

1. 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, traveling along a circumferential tangent path line, each rotor blade having a pitch axis and a variable pitch angle; and
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 non-sinusoidal pitch profile.
2. The fluid turbine of claim 1, wherein the first rotor blade pitch angle is between 7 degrees and 15 degrees to a line tangent to the circumferential path of the rotor blade.
3. The fluid turbine of claim 1, wherein the second rotor blade pitch angle is parallel to a line tangent to the circumferential path of the rotor blade.
4. The fluid turbine of claim 1, wherein the second rotor blade pitch angle is between 20 degrees and 30 degrees to a plane orthogonal to a line tangent to the circumferential path of the rotor blade.
5. The fluid turbine of claim 1, wherein the second rotor pitch angle is between 25 degrees and 35 degrees to a line tangent to the circumferential path of the rotor blade.
6. The fluid turbine of claim 1, wherein the minimum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is upstream of the axis of rotation of the rotor blade.
7. The fluid turbine of claim 1, wherein the maximum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is downstream of the axis of rotation of the rotor blade.
8. 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, traveling along a circumferential tangent path line, each rotor blade having a pitch axis and a variable pitch angle; and
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 non-sinusoidal pitch profile.
9. The fluid turbine of claim 8, wherein the first rotor blade pitch angle is between 7 degrees and 15 degrees to a line tangent to the circumferential path of the rotor blade.
10. The fluid turbine of claim 8, wherein the second rotor blade pitch angle is parallel to a line tangent to the circumferential path of the rotor blade.
11. The fluid turbine of claim 8, wherein the second rotor blade pitch angle is between 20 degrees and 30 degrees to a line tangent to the circumferential path of the rotor blade.
12. The fluid turbine of claim 8, wherein the second rotor pitch angle is between 25 degrees and 35 degrees to a line tangent to the circumferential path of the rotor blade.
13. The fluid turbine of claim 8, wherein the minimum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is upstream of the axis of rotation of the rotor blade.
14. The fluid turbine of claim 8, wherein the maximum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is downstream of the axis of rotation of the rotor blade.
15. 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, traveling along a circumferential tangent path line, each rotor blade having a pitch axis and a variable pitch angle; and
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, according to a non-sinusoidal pitch profile.
16. The fluid turbine of claim 15, wherein the second rotor blade pitch angle is parallel to a line tangent to the circumferential path of the rotor blade.
17. The fluid turbine of claim 15, wherein the first rotor blade pitch angle is between 7 degrees and 15 degrees to a line tangent to the circumferential path of the rotor blade.
18. The fluid turbine of claim 15, wherein the second rotor pitch angle is between 25 degrees and 35 degrees to a line tangent to the circumferential path of the rotor blade.
19. The fluid turbine of claim 15, wherein the minimum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is upstream of the axis of rotation of the rotor blade.
20. The fluid turbine of claim 15, wherein the maximum rotor blade pitch angle for a rotor blade is imposed at a rotor position wherein that rotor blade is downstream of the axis of rotation of the rotor blade.
US12/954,886 2010-11-28 2010-11-28 Fluid Turbine Having Optimized Blade Pitch Profiles Abandoned US20120134820A1 (en)

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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

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US12/954,886 US20120134820A1 (en) 2010-11-28 2010-11-28 Fluid Turbine Having Optimized Blade Pitch Profiles

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Cited By (3)

* Cited by examiner, † Cited by third party
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

Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902072A (en) * 1974-02-19 1975-08-26 Paul J Quinn Wind turbine
US4115027A (en) * 1976-01-16 1978-09-19 Robert Nason Thomas Vertical windmill
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
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
US7365448B2 (en) * 2006-08-17 2008-04-29 X Blade Systems Lp Wind driven power generator
US20080213083A1 (en) * 2007-01-10 2008-09-04 Seabell International Co. Ltd. Vertical Axis Windmill And Wind Turbine System For Generating Electricity From Wind Energy
US20080247872A1 (en) * 2007-01-22 2008-10-09 Lonestar Inventions Lp Method of Operation of a High-Efficiency Turbine With Variable Attack Angle Foils
US7550865B2 (en) * 2006-06-27 2009-06-23 Jonsson Stanley C Wind turbine having variable pitch airfoils that close when moving against the direction of the wind
US7665966B2 (en) * 2004-04-16 2010-02-23 Ventus Spolka ZO.O Flow-controlled wind rotor
US7677862B2 (en) * 2006-08-07 2010-03-16 Boatner Bruce E Vertical axis wind turbine with articulating rotor
US20100084863A1 (en) * 2008-10-03 2010-04-08 Noel Richard Potter Variable vane vertical axis wind turbine
WO2010062018A1 (en) * 2008-11-27 2010-06-03 Snu R & Db Foundation Vertical axis turbine
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
US7911076B2 (en) * 2006-08-17 2011-03-22 Broadstar Developments, Lp Wind driven power generator with moveable cam

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7385302B2 (en) * 2006-06-27 2008-06-10 Jonsson Stanley C Wind turbine having variable pitch airfoils
RU2371354C2 (en) * 2007-12-28 2009-10-27 Зубков Сергей Геннадьевич Method to control flight in expanded range of speeds with controlled thrust-vector rotors

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902072A (en) * 1974-02-19 1975-08-26 Paul J Quinn Wind turbine
US4180367A (en) * 1975-02-10 1979-12-25 Drees Herman M Self-starting windmill energy conversion system
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
US7665966B2 (en) * 2004-04-16 2010-02-23 Ventus Spolka ZO.O Flow-controlled wind rotor
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
US7550865B2 (en) * 2006-06-27 2009-06-23 Jonsson Stanley C Wind turbine having variable pitch airfoils that close when moving against the direction of the wind
US7677862B2 (en) * 2006-08-07 2010-03-16 Boatner Bruce E Vertical axis wind turbine with articulating rotor
US7365448B2 (en) * 2006-08-17 2008-04-29 X Blade Systems Lp Wind driven power generator
US7911076B2 (en) * 2006-08-17 2011-03-22 Broadstar Developments, Lp Wind driven power generator with moveable cam
US20080213083A1 (en) * 2007-01-10 2008-09-04 Seabell International Co. Ltd. Vertical Axis Windmill And Wind Turbine System For Generating Electricity From Wind Energy
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
WO2010062018A1 (en) * 2008-11-27 2010-06-03 Snu R & Db Foundation Vertical axis turbine

Cited By (4)

* Cited by examiner, † Cited by third party
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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