US1519447A - Aerial turbine with vertical axis and helical-centripetal circulation - Google Patents

Aerial turbine with vertical axis and helical-centripetal circulation Download PDF

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US1519447A
US1519447A US613525A US61352523A US1519447A US 1519447 A US1519447 A US 1519447A US 613525 A US613525 A US 613525A US 61352523 A US61352523 A US 61352523A US 1519447 A US1519447 A US 1519447A
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blades
rotor
turbine
vertical
wind
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US613525A
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Fortier-Beaulieu Paul Adolphe
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    • 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 
    • F03D3/04—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F03D3/0409—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels surrounding the rotor
    • 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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • 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
    • F05B2250/00—Geometry
    • F05B2250/20—Geometry three-dimensional
    • F05B2250/25—Geometry three-dimensional helical
    • 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
    • Y02E10/728—Onshore wind turbines
    • 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

  • This invention relates to awind-turbine, with vertical axis, having a high specific power.
  • a rotary drum or rotor connected with the shaft, and composed of vertical driving vanes or blades having a curved horizontal section and somewhat narrow, that is to say extending radially over a somewhat small length in order to leave a substantial free space inside. They are limited at their base by a cone, interrupted along their height and limited at the top by crowns or rings so arranged as to determine a vertical component of the wind. and forming diitusers which allow the escape of the wind through the outletorifice after the same has acted upon the driving or motive blades.
  • Pi fixed part the stator, which supports the rotor revolving inside.
  • This fixed part is constituted by fixed crowns or rings located in the extension of the rotor crowns and adapted to start the vertical. component of the wind, and vertical shutters which are arranged between the fixed crou' ns are suite ably inclined in order to direct the fluid towards the leading edge of the driving blades or vanes,
  • this stator At the upper part of this stator is arranged a crown or ring acting as adiifuser and as an orifice for the exhaust of the driving fluid.
  • the cone which limits the vertical blades at their base can be replaced by different devices constituting modifications.
  • the crown or ring which limits the blade system at the upper part thereof can be omitted, and in this case, the blades end into an extension which is slightly deflected and curved.
  • Fig. 2 is a horizontal section on the line m00 of Fig. 1.
  • Fig. 3 is a vertical section of a modified form.
  • Fig. l is a section on the line f/-01 oi ig. 3.
  • Fig. 5 is a plan view of the upper part oi Fig. 3.
  • Fig. 6 is a vertical section of a modified form.
  • Fig. 7 is a horizontal section on the line YY of Fig. 6.
  • Fig. 8 is a vertical. section of a movable head.
  • the turbine represented in Fig. 1 is mounted on a framework a, and essentially comprises a rotor or drum composed of blades or vanes b leaving a free space within the drum, limited at their base and attheir top by the cone 0 and by the crown or ring 0 respectively; the blades Z) are connected with the shaft 3 and divided into two equal parts along their height by the crown 0 and a stator com posed of two frames, arranged in the form of a cross 7 and f on which are mounted the superposed fixed crowns or rings (Z, (Z (Z the shaft 2 of the rotor passes througiii two bearings and j carried by the stator.
  • Fig. 2 shows the curved form given to the blades.
  • the latter must be selected so as to catch and utilize the wind under the possible conditions and to allow the same to slide on the back face in order to reduce as much as possible the effect of the back PF? sure of the wind in the sector of the rotor where no driving thrust can be exerted by the same.
  • Figs. 3 and 4 show the turbine the stator of which is completed by vertical shutters h arranged at an angle of a few degrees with reference to the leading edge of the blades of the rotor.
  • This distributing device substantially improves the output of the motor, as the fluid, on being better canalized, exerts its thrust upon a larger number of blades and the effect of the back pressure in the direction opposite to that of the rotation of the turbine is suppressed in a manner which is the more complete in that the number of fixed shutters is larger.
  • Fig. 4 shows the number of shutters equal to the number of blades. It is to be noticed that the crown 0 of Fig. 1 is omitted from the structure shown in Fig. 3 and that the blades are terminated at their upper part by an extension which is slightly deflected and curved in order to allow the wind to exert upon them a last strain before escaping through the outlet difluser. In Fig. 3 the cone 0 shownin Fig. 1 is replaced by radial blades 9 which assist in the suction of the air current and adds to the effect of the vertical blades.
  • Fig. 5 shows a plan view of the fourblade screw or propeller is which is loosely mounted on the shaft of the turbine. Its
  • Figs. 6 and 7 show that it is possible to secure to the stator a certain number of vertical shutters k and of crowns or rings at", (Z which is twice the number of blades and crowns of the rotor.
  • This device Fig. 6 allows turbines of a very great height to be constructed, while maintaining an excellent canalization of the driving fluid. It is particularly applicable to turbines having a large diameter It will be seen from Fig. 7 that the vertical fixed shutters h, k do not form an angle with the leading edge of the blades or vanes, which constitute a modified form of the device as shown in Fig. 4. i
  • Fig. 8 shows a movable chimney R which can be applied upon the exhaust diffuser and which opposes itself to any disturbance due to the dipping action ofthe wind and forming an aspirator increases the vacuum inside the rotor.
  • This system is particularly applicable to turbines of small sizes.
  • a rotary drum or rotor connected with the shaft of the turbine and provided with vertical blades or vanes, afixed part or frame within which rotates therotor, annular partitions disposed upon the rotor one above the other, having the shape of surfaces of revolution around the axes of the turbine for directing the fluid and annular partitions disposed upon the fixed part of frame prolonging the annular partitions upon the rotor.
  • a wind turbine comprising a rotor formed of a series of vertical blades, superposed annular plates connecting the blades, a fixed stator, surrounding the blades and plates formed of superposed annular plates, and a difluser at the upper end of the rotor.
  • A. wind turbine comprising, av rotor formed of a series of vertical blades, super posed annular plates connecting the blades, a fixed stator, surrounding the blades and plates formed of superposed annular plates forming continuations of the rotor plates, and a diffuser at the upper end of the rotor.
  • a wind turbine comprising a rotor formed of a series of vertical blades, superposed annular plates connecting the blades, a fixed stator surrounding the blades and plates formed of superposed annular plates forming continuations of the rotor plates, vertically arranged shutters interposed between the stator plates, and a diffuser at the upper end of the rotor.
  • a Wind turbine comprising a vertical rotary shaft a rotor formed of superposed annular plates connected With the shaft, a series of vertically arranged curved blades, carried by said plates a stator formed of fixed superposed annular plates forming continuations of the rotor plates, vertically arranged shutters interposed between the 10 stator plates, and a diffuser at the upper end of the rotor.

Description

1,519,447 P. E. A. FORTlER-BEAULIEU AERIAL TURBINE wm-x VERTICAL AXIS AND HELICAL CENTRIPETAL CIRCULATION Filed Jalri. 18, 1923 Patented lb,
FAUL EUGENE ADQLPHE FGETIEE-BEAULEEU, 0F EOANNE, FRANCE.
Application filed January 18, 1923.
To all LU/lOWl it may cone-61m:
Be it kno that 1, PAUL Euonxn ADoLrHn Fo-nriun-Bnnumnu, a citizen of France, and a resident of Roanne, Loire, France, have invented certain new and use ful Improvements in Aerh Turbines with Vertica Axes and l-lelical-Centripetal Girculation; and I do hereby declare the following' to be a full. clear, and exact descrip on of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.
This invention relates to awind-turbine, with vertical axis, having a high specific power.
It essentially comprises:
1st. A rotary drum or rotor, connected with the shaft, and composed of vertical driving vanes or blades having a curved horizontal section and somewhat narrow, that is to say extending radially over a somewhat small length in order to leave a substantial free space inside. They are limited at their base by a cone, interrupted along their height and limited at the top by crowns or rings so arranged as to determine a vertical component of the wind. and forming diitusers which allow the escape of the wind through the outletorifice after the same has acted upon the driving or motive blades.
2nd. Pi fixed part, the stator, which supports the rotor revolving inside. This fixed part is constituted by fixed crowns or rings located in the extension of the rotor crowns and adapted to start the vertical. component of the wind, and vertical shutters which are arranged between the fixed crou' ns are suite ably inclined in order to direct the fluid towards the leading edge of the driving blades or vanes,
3rd. At the upper part of this stator is arranged a crown or ring acting as adiifuser and as an orifice for the exhaust of the driving fluid.
Moreover, the cone which limits the vertical blades at their base can be replaced by different devices constituting modifications.
Furthermore, the crown or ring which limits the blade system at the upper part thereof can be omitted, and in this case, the blades end into an extension which is slightly deflected and curved.
Serial No. 813,525.
In the accompanying drawings- Fig. 2 is a horizontal section on the line m00 of Fig. 1.
Fig. 3 is a vertical section of a modified form.
Fig. l is a section on the line f/-01 oi ig. 3.
Fig. 5 is a plan view of the upper part oi Fig. 3.
Fig. 6 is a vertical section of a modified form.
Fig. 7 is a horizontal section on the line YY of Fig. 6.
Fig. 8 is a vertical. section of a movable head.
As shown in this drawing, the turbine represented in Fig. 1, is mounted on a framework a, and essentially comprises a rotor or drum composed of blades or vanes b leaving a free space within the drum, limited at their base and attheir top by the cone 0 and by the crown or ring 0 respectively; the blades Z) are connected with the shaft 3 and divided into two equal parts along their height by the crown 0 and a stator com posed of two frames, arranged in the form of a cross 7 and f on which are mounted the superposed fixed crowns or rings (Z, (Z (Z the shaft 2 of the rotor passes througiii two bearings and j carried by the stator.
Fig. 2 shows the curved form given to the blades. The latter must be selected so as to catch and utilize the wind under the possible conditions and to allow the same to slide on the back face in order to reduce as much as possible the effect of the back PF? sure of the wind in the sector of the rotor where no driving thrust can be exerted by the same.
It is to be observed that when the wind blowing hard into the interior of the b Z) in order to impart to the latter ll e dri ing impulse the wind is deflected uni its horizontal direction through the ed crowns (i (Z (i and through the Whole of the cone 0 and the movable crowns or ii 0 the central orifices of which are mole and more flaring. The wind thus takes a vertical direction in order to reach the outlet or exhaust orifice (Z which acts as an outlet difiuser.
It is most important to arrange the blades with a sufficient interspace so as to allow the wind to slide between each of them and, in drawing along the air remaining therein, to create within the rotor a vacuum favorable to the maximum admission of fluid which strikes the driving or motive blades. It will be observed that the air streams tend forcibly to follow the blades in their rotation and execute an ascending movement in the form of a spiral, or in other terms an helical centripetal motion. Figs. 3 and 4 show the turbine the stator of which is completed by vertical shutters h arranged at an angle of a few degrees with reference to the leading edge of the blades of the rotor.
This distributing device substantially improves the output of the motor, as the fluid, on being better canalized, exerts its thrust upon a larger number of blades and the effect of the back pressure in the direction opposite to that of the rotation of the turbine is suppressed in a manner which is the more complete in that the number of fixed shutters is larger.
Fig. 4: shows the number of shutters equal to the number of blades. It is to be noticed that the crown 0 of Fig. 1 is omitted from the structure shown in Fig. 3 and that the blades are terminated at their upper part by an extension which is slightly deflected and curved in order to allow the wind to exert upon them a last strain before escaping through the outlet difluser. In Fig. 3 the cone 0 shownin Fig. 1 is replaced by radial blades 9 which assist in the suction of the air current and adds to the effect of the vertical blades.
Fig. 5 shows a plan view of the fourblade screw or propeller is which is loosely mounted on the shaft of the turbine. Its
revolution is due to the escape of waste gases and prevents any disturbance, which might be caused by a possible dipping action of the wind inside the rotor.
With an appartaus of a larger diameter, it would necessarily involve a larger number of blades.
Figs. 6 and 7 show that it is possible to secure to the stator a certain number of vertical shutters k and of crowns or rings at", (Z which is twice the number of blades and crowns of the rotor.
This device Fig. 6, allows turbines of a very great height to be constructed, while maintaining an excellent canalization of the driving fluid. It is particularly applicable to turbines having a large diameter It will be seen from Fig. 7 that the vertical fixed shutters h, k do not form an angle with the leading edge of the blades or vanes, which constitute a modified form of the device as shown in Fig. 4. i
It will be seen that the base cone 0, shown in Fig. 1 is replaced in Fig. 6 by a small cone p which enters the movable crown. a This device causes the suction of an ascending air current to increase the vacuum within the turbine. Finally, in opposition to Figs. 1 and 3, the central orifices of the crowns o1 rings are not of an increasing diameter but of an equal diameter.
Fig. 8 shows a movable chimney R which can be applied upon the exhaust diffuser and which opposes itself to any disturbance due to the dipping action ofthe wind and forming an aspirator increases the vacuum inside the rotor. This system is particularly applicable to turbines of small sizes.
It will be understood that alterations may be made to the system of turbine which has a fixed part or frame within which rotates the rotor, and annular partitions disposed upon the rotor one above the other, having the shape of surfaces of revolution around the axes of the turbine for directing the fluid.
2. In a wind turbine, a rotary drum or rotor connected with the shaft of the turbine and provided with vertical blades or vanes, afixed part or frame within which rotates therotor, annular partitions disposed upon the rotor one above the other, having the shape of surfaces of revolution around the axes of the turbine for directing the fluid and annular partitions disposed upon the fixed part of frame prolonging the annular partitions upon the rotor.
8. A wind turbine comprising a rotor formed of a series of vertical blades, superposed annular plates connecting the blades, a fixed stator, surrounding the blades and plates formed of superposed annular plates, and a difluser at the upper end of the rotor.
4:. A. wind turbine comprising, av rotor formed of a series of vertical blades, super posed annular plates connecting the blades, a fixed stator, surrounding the blades and plates formed of superposed annular plates forming continuations of the rotor plates, and a diffuser at the upper end of the rotor.
5. A wind turbine comprising a rotor formed of a series of vertical blades, superposed annular plates connecting the blades, a fixed stator surrounding the blades and plates formed of superposed annular plates forming continuations of the rotor plates, vertically arranged shutters interposed between the stator plates, and a diffuser at the upper end of the rotor.
6. A Wind turbine comprising a vertical rotary shaft a rotor formed of superposed annular plates connected With the shaft, a series of vertically arranged curved blades, carried by said plates a stator formed of fixed superposed annular plates forming continuations of the rotor plates, vertically arranged shutters interposed between the 10 stator plates, and a diffuser at the upper end of the rotor.
In testimony that I claim the foregoing as my invention, I have signed my name hereto.
PAUL EUGENE ADOLPHE FORTIER-BEAULIEU.
WVitness:
JULIAN CEMBLE LUEDY.
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236866A (en) * 1976-12-13 1980-12-02 Valentin Zapata Martinez System for the obtainment and the regulation of energy starting from air, sea and river currents
US4309146A (en) * 1980-03-12 1982-01-05 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Amplified wind turbine apparatus
US4418880A (en) * 1981-11-27 1983-12-06 Waal J F De Fluid flow augmentor
US4452562A (en) * 1983-05-06 1984-06-05 Iowa State University Research Foundation, Inc. Tornado type wind turbines
US4457666A (en) * 1982-04-14 1984-07-03 The Windgrabber Corporation Apparatus and method for deriving energy from a moving gas stream
US4857753A (en) * 1986-10-04 1989-08-15 Mewburn-Crook Company Limited Wind energy convertor
US5020967A (en) * 1987-12-04 1991-06-04 Dominique Gual Wind motor module made by assembling a parabolic-flow turbine between a base and a dome
WO2003040554A1 (en) * 2001-11-08 2003-05-15 Albert Vasilievich Bolotov Vertical axis wind turbine (vawt)
US20040240984A1 (en) * 2001-07-05 2004-12-02 Kiknadze Gennady Iraklievich Method of conversion of continuous medium flow energy and device for conversion of continuous medium flow energy
US20070258806A1 (en) * 2006-05-05 2007-11-08 Hart James R Helical taper induced vortical flow turbine
US20110033288A1 (en) * 2009-08-05 2011-02-10 Pezaris Constantine D Omnidirectional vertical-axis wind turbine
US20110223023A1 (en) * 2010-03-11 2011-09-15 Melvin Don Carden Mechanical rotor
EP2652319A1 (en) * 2012-01-13 2013-10-23 Pellegri, Adriano Cyclonic vertical axis wind turbine with a wind guide
US8905706B2 (en) 2010-06-17 2014-12-09 Chris Bills Vortex propeller
US8961103B1 (en) * 2014-06-25 2015-02-24 John George Wolff Vertical axis wind turbine with axial flow rotor
RU2689661C1 (en) * 2018-10-31 2019-05-28 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет", (ДГТУ) Wind-driven power plant
US10378509B2 (en) 2017-10-06 2019-08-13 Iap, Inc. Turbine rotor for redirecting fluid flow including sinuously shaped blades and a solid conical center core
US20190360465A1 (en) * 2018-05-22 2019-11-28 Christopher T. Moore Vertical axis wind turbine apparatus and system
US11215165B2 (en) * 2018-03-08 2022-01-04 Branko MIZERIT Vortex acceleration wind energy tower
US20230008558A1 (en) * 2019-12-16 2023-01-12 Anatolij Viktorovich Leoshko Vertical-axis wind turbine
US11655798B2 (en) * 2021-08-26 2023-05-23 Daniel Maurice Lerner Multistage vertical axis wind turbine

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236866A (en) * 1976-12-13 1980-12-02 Valentin Zapata Martinez System for the obtainment and the regulation of energy starting from air, sea and river currents
US4309146A (en) * 1980-03-12 1982-01-05 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Amplified wind turbine apparatus
US4418880A (en) * 1981-11-27 1983-12-06 Waal J F De Fluid flow augmentor
US4457666A (en) * 1982-04-14 1984-07-03 The Windgrabber Corporation Apparatus and method for deriving energy from a moving gas stream
US4452562A (en) * 1983-05-06 1984-06-05 Iowa State University Research Foundation, Inc. Tornado type wind turbines
US4857753A (en) * 1986-10-04 1989-08-15 Mewburn-Crook Company Limited Wind energy convertor
US5020967A (en) * 1987-12-04 1991-06-04 Dominique Gual Wind motor module made by assembling a parabolic-flow turbine between a base and a dome
US20040240984A1 (en) * 2001-07-05 2004-12-02 Kiknadze Gennady Iraklievich Method of conversion of continuous medium flow energy and device for conversion of continuous medium flow energy
US7331752B2 (en) * 2001-07-05 2008-02-19 Inventors Network Gmbh Method of conversion of continuous medium flow energy and device for conversion of continuous medium flow energy
WO2003040554A1 (en) * 2001-11-08 2003-05-15 Albert Vasilievich Bolotov Vertical axis wind turbine (vawt)
US20070258806A1 (en) * 2006-05-05 2007-11-08 Hart James R Helical taper induced vortical flow turbine
US7494315B2 (en) * 2006-05-05 2009-02-24 Hart James R Helical taper induced vortical flow turbine
US20110033288A1 (en) * 2009-08-05 2011-02-10 Pezaris Constantine D Omnidirectional vertical-axis wind turbine
US8128337B2 (en) * 2009-08-05 2012-03-06 Constantine D Pezaris Omnidirectional vertical-axis wind turbine
US20110223023A1 (en) * 2010-03-11 2011-09-15 Melvin Don Carden Mechanical rotor
US8905706B2 (en) 2010-06-17 2014-12-09 Chris Bills Vortex propeller
EP2652319A1 (en) * 2012-01-13 2013-10-23 Pellegri, Adriano Cyclonic vertical axis wind turbine with a wind guide
US8961103B1 (en) * 2014-06-25 2015-02-24 John George Wolff Vertical axis wind turbine with axial flow rotor
US10378509B2 (en) 2017-10-06 2019-08-13 Iap, Inc. Turbine rotor for redirecting fluid flow including sinuously shaped blades and a solid conical center core
US11215165B2 (en) * 2018-03-08 2022-01-04 Branko MIZERIT Vortex acceleration wind energy tower
US20190360465A1 (en) * 2018-05-22 2019-11-28 Christopher T. Moore Vertical axis wind turbine apparatus and system
US10724502B2 (en) * 2018-05-22 2020-07-28 Creating Moore, Llc Vertical axis wind turbine apparatus and system
US11149715B2 (en) 2018-05-22 2021-10-19 Harmony Turbines Inc. Vertical axis wind turbine apparatus and system
RU2689661C1 (en) * 2018-10-31 2019-05-28 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет", (ДГТУ) Wind-driven power plant
US20230008558A1 (en) * 2019-12-16 2023-01-12 Anatolij Viktorovich Leoshko Vertical-axis wind turbine
US11655798B2 (en) * 2021-08-26 2023-05-23 Daniel Maurice Lerner Multistage vertical axis wind turbine

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