GB2447506A - Automatic pitch control for sail-type wind turbine - Google Patents

Automatic pitch control for sail-type wind turbine Download PDF

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Publication number
GB2447506A
GB2447506A GB0705083A GB0705083A GB2447506A GB 2447506 A GB2447506 A GB 2447506A GB 0705083 A GB0705083 A GB 0705083A GB 0705083 A GB0705083 A GB 0705083A GB 2447506 A GB2447506 A GB 2447506A
Authority
GB
United Kingdom
Prior art keywords
sail
wind
sails
automatic pitch
crete
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.)
Withdrawn
Application number
GB0705083A
Other versions
GB0705083D0 (en
Inventor
Gavin Cook
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0705083A priority Critical patent/GB2447506A/en
Publication of GB0705083D0 publication Critical patent/GB0705083D0/en
Publication of GB2447506A publication Critical patent/GB2447506A/en
Withdrawn legal-status Critical Current

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
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
    • F05B2240/311—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape flexible or elastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
    • F05B2240/312—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape capable of being reefed
    • 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

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

An automatic pitch regulation control mechanism for a wind-driven Crete-style sail-mill/generator comprises sails 2, each supported by an arm 1 and a sheet (line or rope). The sheets are variable in length and may be elastic or comprise springs, whereby the angles of the sails may vary according to the velocity of the wind.

Description

Automatic pitch regulation control mechanism for the Crete-styte
sail-mill aerogenerator This invention relates to the means of automatically changing the pitch of the sails of the crete-style sail-mill! aerogenerator, which is a historical design of rotor, designed to extract power from the wind.
[he crete-style sail-mill! aerogenerator, is made up of betveen four and eight radial arms projecting from a hub, each supporting a sail. The trailing edge of each of these triangular sails is restrained by a sheet, connected to the next radial arm. The term sheet', is sailing terminology for a line or rope controlling the position of a sail relative to the wind. The leading edge of the sail is where it is connected to the radial arm.
The crete-style sail-mill! aerogenerator is a horizontal axis rotor, the plane of rotation being perpendicular to the wind direction. The pitch of the sails, is the angle of the sails, relative to the plane of rotation, controlled by the sheets.
Under different circumstances, if the pitch of the sails remain fixed, difficulties may be encountered. At times of very high wind speeds, damaging forces act upon the rotor. With a fixed pitch, the power of the wind may cause the sails to tear, or the radial arms to become damaged. Alternatively, the device the rotor is intended to power, may become overpowered. For example, if the rotor is designed to generate electricity, the generator may exceed its maximum limit; or if the rotor is designed to power a pump, the pump may exceed its maximum output. For these reasons an automatic control mechanism, limiting the power generated at different wind speeds, is very beneficial. This is achieved by this invention, which automatically changes the pitch of the sails relative to the wind speed.
The power extracted from the wind by a rotor of fixed diameter and pre-determined shape of sail with a pre-determined number of sails, is determined by the velocity of the wind and the pitch of the sails. The sheets for the sails for the automatic pitch regulation of this invention are made of elastic material. As the velocity of the wind increases, the rotor generates more power, up to a nominal level where the elasticity of the sheet takes effect. The restraining sheet then increases in length automatically as the velocity of the wind increases. This creates a change in the angle of the sail relative to the plane of rotation, equivalent to pitching the leading edge of the sail into the wind. This reduces the power generated by the rotor to the nominal level where the elasticity of the sheet takes effect. This is achieved by the sheets having a flexibility in their length given by their being made of springs or elastic.
The invention will now be described solely by way of example and with reference to the accompanying drawing, figure 1.
Figure 1 is an example of a crete-style sail-mill! aerogenerator rotor, with six radial arms 1. Each sail 2, is held by a radial arm and the trailing edge 3 restrained by a sheet 4. In this example the rotor would rotate clockwise. The pitch of each sail 2, is controlled by the length of each restraining sheet 4. This occurs automatically as the velocity of the wind changes, as the sheets have flexibility in the their length.

Claims (3)

  1. Claims 1. An automatic pitch regulation control mechanism for the
    Crete-style sail-mill/aerogenerator, the pitch of the sails controlled by restraining sheets flexible in their length.
  2. 2. An automatic pitch regulation control mechanism for the Crete-style sail-mill/aerogenerator according to claim 1, in which the flexibility in length of the restraining sheets is provided by springs.
  3. 3. An automatic pitch regulation control mechanism for the Crete-style sail-mill/aerogenerator according to claim 1, in which the flexibility in length of the restraining sheets is provided by elastic.
GB0705083A 2007-03-16 2007-03-16 Automatic pitch control for sail-type wind turbine Withdrawn GB2447506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0705083A GB2447506A (en) 2007-03-16 2007-03-16 Automatic pitch control for sail-type wind turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0705083A GB2447506A (en) 2007-03-16 2007-03-16 Automatic pitch control for sail-type wind turbine

Publications (2)

Publication Number Publication Date
GB0705083D0 GB0705083D0 (en) 2007-04-25
GB2447506A true GB2447506A (en) 2008-09-17

Family

ID=38008560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0705083A Withdrawn GB2447506A (en) 2007-03-16 2007-03-16 Automatic pitch control for sail-type wind turbine

Country Status (1)

Country Link
GB (1) GB2447506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR20150100122A (en) * 2015-03-16 2016-10-20 Μαριος Γεωργιος Χριστοδουλακης Pitch-controlling mechanism for sail motors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB395301A (en) * 1933-03-10 1933-07-13 Jules D Asseler Improvements in and relating to windmills
EP0035313A2 (en) * 1980-03-03 1981-09-09 Gregory E. Cook Wind turbine and method for power generation
EP0236036A2 (en) * 1986-02-25 1987-09-09 Montana Wind Turbine, Inc Wind turbine
GB2256233A (en) * 1990-02-16 1992-12-02 Proven Eng Prod Windmill
US6402472B1 (en) * 2000-02-29 2002-06-11 Allan Curtis Hogue Sail-type windmill wheel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB395301A (en) * 1933-03-10 1933-07-13 Jules D Asseler Improvements in and relating to windmills
EP0035313A2 (en) * 1980-03-03 1981-09-09 Gregory E. Cook Wind turbine and method for power generation
EP0236036A2 (en) * 1986-02-25 1987-09-09 Montana Wind Turbine, Inc Wind turbine
GB2256233A (en) * 1990-02-16 1992-12-02 Proven Eng Prod Windmill
US6402472B1 (en) * 2000-02-29 2002-06-11 Allan Curtis Hogue Sail-type windmill wheel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR20150100122A (en) * 2015-03-16 2016-10-20 Μαριος Γεωργιος Χριστοδουλακης Pitch-controlling mechanism for sail motors

Also Published As

Publication number Publication date
GB0705083D0 (en) 2007-04-25

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)