WO2010125599A2 - Rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with static flow diverters - Google Patents

Rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with static flow diverters Download PDF

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Publication number
WO2010125599A2
WO2010125599A2 PCT/IT2010/000177 IT2010000177W WO2010125599A2 WO 2010125599 A2 WO2010125599 A2 WO 2010125599A2 IT 2010000177 W IT2010000177 W IT 2010000177W WO 2010125599 A2 WO2010125599 A2 WO 2010125599A2
Authority
WO
WIPO (PCT)
Prior art keywords
blade
diverter
rotor
aeolic
flow
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.)
Ceased
Application number
PCT/IT2010/000177
Other languages
French (fr)
Other versions
WO2010125599A3 (en
Inventor
Leonardo Valentini
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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
Publication of WO2010125599A2 publication Critical patent/WO2010125599A2/en
Publication of WO2010125599A3 publication Critical patent/WO2010125599A3/en
Anticipated expiration legal-status Critical
Ceased 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
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/211—Rotors for wind turbines with vertical axis
    • F05B2240/214—Rotors for wind turbines with vertical axis of the Musgrove or "H"-type
    • 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
    • F05B2240/301—Cross-section characteristics
    • 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
    • F05B2260/85—Starting
    • 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 invention relates to a rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with aerodynamic static flow diverters, and particularly it refers to a blade of the above kind provided with an aerodynamic flow static diverter comprised of an auxiliary blade coupled with said rotor blade, so designed to permit self-starting of the aeolic rotor even with very low wind speed and with wind arriving from every direction.
  • Another solution realised in order to reduce resistance during counter wind action provides adopting movable hemi-blades which open during the passive phase and close during the active phase; this system has problems for its activation when, stopped, must be started, in case wind arrives from a direction different wit h respect to the direction of orientation of the turbine.
  • Another known solution provides realisation of a fixed flow diverter, comprised of an circular structure, outside the turbine, comprising fixed blades conveying air flow within the turbine, increasing speed of entering wind; this system has the drawbacks of increasing dimensions of turbine, being subjected to speed reduction, and consequently power reductions, and of requiring a troublesome mounting.
  • object of the present invention is that of overcoming said drawbacks, realising a rotor blade with aerodynamic flow static diverter, and a vertical axis aeolic rotor with aerodynamic static flow diverters, which is silent, with reduced dimensions with the same efficiency, permits self-starting of the rotor even at very low speeds, regardless the wind direction, and is advantageous under an economic point of view.
  • a rotor blade with aerodynamic flow static diverter in particular blade for vertical axis aeolic rotor, characterised in that said aerodynamic flow static diverter is fixedly coupled with said rotor blade, said diverter being positioned inside with respect to said rotor, close to the blade leading edge, and having an aerodynamic shape extending substantially parallel with respect to the profile portion of said blade corresponding, and faced toward, the same diverter.
  • length of cord between the two ends of said flow diverter is within the range of 1/2 and 1/10 of the length of cord between the two ends of said blade.
  • length of cord between the two ends of said flow diverter is 1/4 of the length of cord between the two ends of said blade.
  • ratio between distance of said diverter and the leading edge of said blade and cord length between the two ends of said flow diverter is within the range of 0 and 1/2.
  • ratio between distance of said diverter and the leading edge of said blade and cord length between the two ends of said flow diverter is 1/6.
  • ratio between distance between said diverter with respect to the trailing edge of said blade and length of the cord between the two ends of said flow diverter is within the range between 1/10 and 1/2.
  • ratio between distance between said diverter with respect to the trailing edge of said blade and length of the cord between the two ends of said flow diverter is 1/4.
  • angle between said blade axis and axis of said diverter is included within the range between 0° and 30°, preferably 15°.
  • angle between said blade axis and axis of said diverter is 15°.
  • a vertical axis aeolic rotor with aerodynamic static flow diverters characterised in that it comprises a plurality of blades as defined in the above.
  • figure 1 schematically shows a horizontal section view of the operation of a vertical axis aeolic turbine with diverter according to the invention
  • figure 2 schematically shows a horizontal section view of a blade for vertical axis aeolic turbine with diverter according to the invention
  • figure 3 is a horizontal section view of a blade with diverter according to the invention.
  • flow diverter 1 is rigidly coupled with each blade 2 of an aeolic turbine 3.
  • Blade 2 has an aerodynamic shape, having a variable profile, with a larger section in correspondence of its front end or leading edge, and decreasing up o zero in correspondence of its read end, or trailing edge.
  • Flow diverter 1 is positioned inside turbine 3, in front of blade 2, and has an aerodynamic shape with inner profile substantially equal to the inlet portion of the blade 2, corresponding to, and faced toward, the diverter 1 , so as to create a wind flow channel with a substantially uniform amplitude.
  • profile of diverter 1 with respect to profile of blade 2, as well as its extension, can be different with respect to those shown in the figures.
  • length U of the cord between the two ends of the flow diverter 1 is about one third of length b of the cord between the two ends of blade 2, preferably 1/4.
  • Ratio between distance Z of the diverter 1 trailing edge with respect to the blade 2 trailing edge and length U of cord between the two ends of flow diverter 1 is included within the range between 1/10 and 1/2, preferably 1/4.
  • z/h 1/4
  • Angle D between blade 2 axis and diverter 1 axis is included within the range between 0° and 30°, preferably 15°.
  • peripheral speed of turbine 3 is almost equal to the inlet wind speed, regardless its direction, thus obtaining a high torque with a low number of revolutions.

Landscapes

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

Abstract

The present invention relates to a rotor (3) blade (2) with aerodynamic flow static diverter (1), in particular blade (2) for vertical axis aeolic rotor (3), characterised in that said aerodynamic flow static diverter (1) is fixedly coupled with said rotor (3) blade (2), said diverter (1) being positioned inside with respect to said rotor (3), close to the blade (2) leading edge, and having an aerodynamic shape extending substantially parallel with respect to the profile portion of said blade (2) corresponding, and faced toward, the same diverter (1).

Description

ROTOR BLADE WITH AERODYNAMIC FLOW STATIC DIVERTER, IN PARTICULAR BLADE FOR VERTICAL AXIS AEOLIC ROTOR, AND VERTICAL AXIS AEOLIC ROTOR
WITH STATIC FLOW DIVERTERS
The present invention relates to a rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with aerodynamic static flow diverters, and particularly it refers to a blade of the above kind provided with an aerodynamic flow static diverter comprised of an auxiliary blade coupled with said rotor blade, so designed to permit self-starting of the aeolic rotor even with very low wind speed and with wind arriving from every direction.
Known vertical axis aeolic turbine are the most ancient conceived by mankind. They were exploited in Mesopotamia, mainly for watering fields, since the first civilization in that area. Forgotten for some years and replaced by blades which are typical in windmills, have been
"discovered" again during XIX siecle.
In the last years, vertical axis aeolic turbines have arisen again interest of some firms and some researchers on many Universities all over the word. Aim of these searches is that of increasing turbine efficiency and permitting self-starting of the rotor even with very low wind speed, regardless its direction.
In order to obtain these results, aeloic turbines have been realised with a windscreen, protecting the passive part of the rotor, increasing efficiency of its active part - i.e. the part hit by wind - with the drawback of requiring precisely orienteering turbine according to main wind direction, loosing main advantage of the vertical axis turbine with respect to horizontal turbine, i.e. efficiency regardless wind direction.
Another solution realised in order to reduce resistance during counter wind action, provides adopting movable hemi-blades which open during the passive phase and close during the active phase; this system has problems for its activation when, stopped, must be started, in case wind arrives from a direction different wit h respect to the direction of orientation of the turbine. Another known solution provides realisation of a fixed flow diverter, comprised of an circular structure, outside the turbine, comprising fixed blades conveying air flow within the turbine, increasing speed of entering wind; this system has the drawbacks of increasing dimensions of turbine, being subjected to speed reduction, and consequently power reductions, and of requiring a troublesome mounting.
Thus, object of the present invention is that of overcoming said drawbacks, realising a rotor blade with aerodynamic flow static diverter, and a vertical axis aeolic rotor with aerodynamic static flow diverters, which is silent, with reduced dimensions with the same efficiency, permits self-starting of the rotor even at very low speeds, regardless the wind direction, and is advantageous under an economic point of view.
It is therefore specific object of the present invention a rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, characterised in that said aerodynamic flow static diverter is fixedly coupled with said rotor blade, said diverter being positioned inside with respect to said rotor, close to the blade leading edge, and having an aerodynamic shape extending substantially parallel with respect to the profile portion of said blade corresponding, and faced toward, the same diverter.
Further, according to the invention, length of cord between the two ends of said flow diverter is within the range of 1/2 and 1/10 of the length of cord between the two ends of said blade. Preferably, length of cord between the two ends of said flow diverter is 1/4 of the length of cord between the two ends of said blade.
Furthermore, according to the invention, ratio between distance of said diverter and the leading edge of said blade and cord length between the two ends of said flow diverter is within the range of 0 and 1/2. Preferably, according to the invention, ratio between distance of said diverter and the leading edge of said blade and cord length between the two ends of said flow diverter is 1/6.
Still according to the invention, ratio between distance between said diverter with respect to the trailing edge of said blade and length of the cord between the two ends of said flow diverter is within the range between 1/10 and 1/2.
Preferably, according to the invention, ratio between distance between said diverter with respect to the trailing edge of said blade and length of the cord between the two ends of said flow diverter is 1/4. Always according to the invention, angle between said blade axis and axis of said diverter is included within the range between 0° and 30°, preferably 15°. Preferably, according to the invention, angle between said blade axis and axis of said diverter is 15°.
Finally, it is further specific object of the present invention a vertical axis aeolic rotor with aerodynamic static flow diverters, characterised in that it comprises a plurality of blades as defined in the above.
Present invention will be now described, for illustrative but not limitative purposes, according to a preferred embodiment, making particular reference to the enclosed figures, wherein: figure 1 schematically shows a horizontal section view of the operation of a vertical axis aeolic turbine with diverter according to the invention; figure 2 schematically shows a horizontal section view of a blade for vertical axis aeolic turbine with diverter according to the invention; and figure 3 is a horizontal section view of a blade with diverter according to the invention.
Making reference to the figures, flow diverter 1 according to the invention is rigidly coupled with each blade 2 of an aeolic turbine 3. Blade 2 has an aerodynamic shape, having a variable profile, with a larger section in correspondence of its front end or leading edge, and decreasing up o zero in correspondence of its read end, or trailing edge.
Flow diverter 1 is positioned inside turbine 3, in front of blade 2, and has an aerodynamic shape with inner profile substantially equal to the inlet portion of the blade 2, corresponding to, and faced toward, the diverter 1 , so as to create a wind flow channel with a substantially uniform amplitude. In any case, profile of diverter 1 with respect to profile of blade 2, as well as its extension, can be different with respect to those shown in the figures. Observing now figure 3, length U of the cord between the two ends of the flow diverter 1 is about one third of length b of the cord between the two ends of blade 2, preferably 1/4.
I1=I2M
Ratio between distance s of diverter 1 leading edge with respect to the leading edge of blade 2 and length U of cord between the two ends of flow diverter 1 is included within the range between 0 and 1/2, preferably 1/6. s/li=1/6
Ratio between distance Z of the diverter 1 trailing edge with respect to the blade 2 trailing edge and length U of cord between the two ends of flow diverter 1 is included within the range between 1/10 and 1/2, preferably 1/4. z/h=1/4
Angle D between blade 2 axis and diverter 1 axis is included within the range between 0° and 30°, preferably 15°.
D=15° Advantageously, thanks to the described shape of diverter 1 according to the invention, peripheral speed of turbine 3is almost equal to the inlet wind speed, regardless its direction, thus obtaining a high torque with a low number of revolutions.
Further advantage of the present invention is obtaining a self- starting of turbine 3 even with a very low wind, a high reliability of the system realised and easiness of realisation.
Present invention has been described for illustrative, but not limitative purposes according to its preferred embodiment, but it is to be understood that variations and/or modifications can be introduced by those skilled in the art without departing from the relevant scope, as defined in the enclosed claims.

Claims

1. Rotor (3) blade (2) with aerodynamic flow static diverter (1), in particular blade (2) for vertical axis aeolic rotor (3), characterised in that said aerodynamic flow static diverter (1) is fixedly coupled with said rotor (3) blade (2), said diverter (1) being positioned inside with respect to said rotor (3), close to the blade (2) leading edge, and having an aerodynamic shape extending substantially parallel with respect to the profile portion of said blade (2) corresponding, and faced toward, the same diverter (1).
2. Blade (2) according to claim 1, characterised in that length
(l-i) of cord between the two ends of said flow diverter (1) is within the range of 1/2 and 1/10 of the length (I2) of cord between the two ends of said blade (2).
3. Blade (2) according to one of preceding claims, characterised in that length (h) of cord between the two ends of said flow diverter (1) is
1/4 of the length (I2) of cord between the two ends of said blade (2).
4. Blade (2) according to one of preceding claims, characterised in that ratio between distance (s) of said diverter (1) and the leading edge of said blade (2) and cord length (h) between the two ends of said flow diverter (1) is within the range of 0 and 1/2.
5. Blade (2) according to one of preceding claims, characterised in that ratio between distance (s) of said diverter (1) and the leading edge of said blade (2) and cord length (I1) between the two ends of said flow diverter (1) is 1/6.
6. Blade (2) according to one of preceding claims, characterised in that ratio between distance between said diverter with respect to the trailing edge of said blade and length of the cord between the two ends of said flow diverter is within the range between 1/10 and 1/2.
7. Blade (2) according to one of preceding claims, characterised in that ratio between distance (z) between said diverter (1) with respect to the trailing edge of said blade (2) and length (I1) of the cord between the two ends of said flow diverter (1) is 1/4.
8. Blade (2) according to one of preceding claims, characterised in that angle (D) between said blade (2) axis and axis of said diverter (1) is included within the range between 0° and 30°, preferably 15°.
7. Blade (2) according to one of preceding claims, characterised in that angle (D) between said blade (2) axis and axis of said diverter (1) is 15°.
10. Vertical axis aeolic rotor (3) with aerodynamic static flow diverters, characterised in that it comprises a plurality of blades (2) according to one of the preceding claims.
PCT/IT2010/000177 2009-04-27 2010-04-23 Rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with static flow diverters Ceased WO2010125599A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPG2009U000008 2009-04-27
ITPG20090008 ITPG20090008U1 (en) 2009-04-27 2009-04-27 STATIC AERODYNAMIC FLOW DIVERTER FOR VERTICAL WIND ROTOR BLADES.

Publications (2)

Publication Number Publication Date
WO2010125599A2 true WO2010125599A2 (en) 2010-11-04
WO2010125599A3 WO2010125599A3 (en) 2011-06-03

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PCT/IT2010/000177 Ceased WO2010125599A2 (en) 2009-04-27 2010-04-23 Rotor blade with aerodynamic flow static diverter, in particular blade for vertical axis aeolic rotor, and vertical axis aeolic rotor with static flow diverters

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IT (1) ITPG20090008U1 (en)
WO (1) WO2010125599A2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013245564A (en) * 2012-05-23 2013-12-09 Ritsumeikan Blade for vertical axial wind turbine and vertical axial wind turbine
WO2015044615A1 (en) 2013-09-30 2015-04-02 Electricfil Automotive Rotor for a vertical-axis wind turbine
WO2015101761A1 (en) * 2013-12-30 2015-07-09 Global Vtech Limited A turbine with outer and inner rotor being contra-rotating
DE102014002078A1 (en) * 2014-02-14 2015-08-20 Thorsten RATH Vertical Wind Generator
JP2015203397A (en) * 2014-04-16 2015-11-16 国立大学法人 東京大学 Wave power turbine
PL442572A1 (en) * 2022-10-19 2024-01-03 Instytut Maszyn Przepływowych Im. Roberta Szewalskiego Polskiej Akademii Nauk Self-starting wind turbine with a vertical axis of rotation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576700A (en) * 1947-06-02 1951-11-27 Schneider Brothers Company Blading for fluid flow devices
CH659851A5 (en) * 1981-06-05 1987-02-27 Escher Wyss Ag TURBINE.
DE9013551U1 (en) * 1990-09-27 1991-01-17 Fritz, J. Peter, 2122 Bleckede Blade profile for wind turbines
JP2001065446A (en) * 1999-08-24 2001-03-16 Hitoshi Iijima Cascade structure for vertical shaft type windmill and vertical shaft type windmill
ITBA20030052A1 (en) * 2003-10-17 2005-04-18 Paolo Pietricola ROTORIC AND STATHIC POLES WITH MULTIPLE PROFILES
JP2009074447A (en) * 2007-09-20 2009-04-09 Yamaguchi Prefecture Vertical axis windmill

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013245564A (en) * 2012-05-23 2013-12-09 Ritsumeikan Blade for vertical axial wind turbine and vertical axial wind turbine
WO2015044615A1 (en) 2013-09-30 2015-04-02 Electricfil Automotive Rotor for a vertical-axis wind turbine
FR3011285A1 (en) * 2013-09-30 2015-04-03 Electricfil Automotive ROTOR FOR WIND TURBINE IN PARTICULAR VERTICAL AXIS
WO2015101761A1 (en) * 2013-12-30 2015-07-09 Global Vtech Limited A turbine with outer and inner rotor being contra-rotating
DE102014002078A1 (en) * 2014-02-14 2015-08-20 Thorsten RATH Vertical Wind Generator
DE102014002078B4 (en) * 2014-02-14 2017-08-31 Thorsten RATH Vertical Wind Generator
US9932965B2 (en) 2014-02-14 2018-04-03 Thorsten Rath Vertical wind generator
JP2015203397A (en) * 2014-04-16 2015-11-16 国立大学法人 東京大学 Wave power turbine
PL442572A1 (en) * 2022-10-19 2024-01-03 Instytut Maszyn Przepływowych Im. Roberta Szewalskiego Polskiej Akademii Nauk Self-starting wind turbine with a vertical axis of rotation

Also Published As

Publication number Publication date
ITPG20090008U1 (en) 2010-10-28
WO2010125599A3 (en) 2011-06-03

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