WO2012028890A1 - Wind turbine blades with dimples - Google Patents
Wind turbine blades with dimples Download PDFInfo
- Publication number
- WO2012028890A1 WO2012028890A1 PCT/GR2011/000033 GR2011000033W WO2012028890A1 WO 2012028890 A1 WO2012028890 A1 WO 2012028890A1 GR 2011000033 W GR2011000033 W GR 2011000033W WO 2012028890 A1 WO2012028890 A1 WO 2012028890A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- wind turbine
- wind
- turbine blades
- technique
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000009792 diffusion process Methods 0.000 claims abstract 2
- 230000007704 transition Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
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
- 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
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
-
- 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
- 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
- F05B2240/32—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor with roughened surface
-
- 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
- F05B2250/24—Geometry three-dimensional ellipsoidal
- F05B2250/241—Geometry three-dimensional ellipsoidal spherical
-
- 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
- F05B2250/28—Geometry three-dimensional patterned
-
- 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
Definitions
- the invention refers to a technique applied on horizontal axis wind turbine blades which are placed on the rotor, on wind turbine's tower.
- Wind turbines of such type with blades are known, made from known materials such as light plastic reinforced with glass, aluminum, thin wooden layers, etc.
- the back side of these blades is more curved than the front side.
- After length, which is of crucial contribution for wind turbine's performance, other factors such as width, thickness and weight are as well contributing for maximizing their rotation which is characterized from a concession between the need for aero dynamical design and durability.
- Wind turbine blades are designed and manufactured in a particular way, placed on rotor in order to take advantage the most out of the passing, through them, wind energy that causes their rotational motion. Through blade rotation on the axis, conversion is occurred, through the generator, from motional (rotational) energy to electrical. Rotation of these blades is caused and conducted by been affected exclusively from the pressure masses and gusts exercised by the wind. Depending on the proportional implemented rotational velocity can be judged either as negative (economically unprofitable or dangerous) or positive (proper and useful). During wind's molecules collision frontally to the rotating blades, wind's velocity declines, creating increased pressure at front blade's side and decreased at its back side, where eddies and vortexes take place.
- This energy interaction between blades and wind is the aero dynamical resistance and more specifically it contains the horizontal wind resistance (drag force) and the vertical or dynamical wind uplift (lift force).
- the horizontal wind resistance (drag force) acts in the contrary to wind direction decelerating blade's rotational rate, causing the pressure difference, a force (expressed as drag form or pressure resistance) is directing from an area with larger pressure (front blade side) towards an area with smaller pressure (back blade side).
- the advantage of this invention is that dimples of hemispherical shape are arranged in specific order on the surface of wind turbine blades, a technique transferred directly from the hemispherical or polygonal (e.g. hexagonal) dimples arranged on golf balls.
- This technique is taking full advantage of the aero dynamical phenomena, managing to the maximum initially the impacted wind on blades frontally, while passing through them and finally on the outgoing wind masses (exiting) from them contributing at these points to a proper and manageable laminar air flow and a steadier blade rotation offering a quality, reliable, economical and silent wind turbine operation.
- the reason for transferring gol s ball dimple arrangement technique identically to wind turbine blades surface is to reproduce the formation of the most possible laminar air flow and eventually to manage in the most effective way the attached, incoming and outgoing wind, defusing pressure difference between blade's two sides at the maximum possible degree.
- Wind turbine blades are characterized by being applied on their surface precisely the dimple arrangement technique of golf balls, covering either their surface totally or just the back side only, in order for the drag force phenomenon only to be encountered effectively.
- a simple way for presenting this particular dimple arrangement technique on wind turbine blades is made according to the invention by using as many as possible (the dimple number is in ratio to the surface covered) hemispherical or polygonal (e.g. hexagonal) shaped dimples arranged as much as closer to one another, in rows and alternately among them resulting to be tangential, covering totally both blade's surfaces exploiting and managing to the most beneficial degree the aerodynamic phenomena occurred during wind's frontal impact at the front side as well as during wind's movement towards the back side maximizing lift force and at the same time eliminating the negative and retarding pressure (drag force).
- the dimple arrangement technique of the present invention it is permitted on the wind turbine blades surface to be placed hemispherical or polygonal dimples, as many as possible of them, arranged in an as much as closer to one another approach, in rows and alternately among them resulting to be tangential, maximizing laminar air flow and air management displacement, creating less frontal resistance and as a result to maximize lift force causing friction minimization, since next wind mass's molecules are contacting previous air molecules, entrapped in these dimples instead of directly with blade's detrimental smoothly surface or material.
- Figure 1 shows a front view of three wind turbine blades.
- Figure 2 shows a blade's magnification front view.
- Figure 3 shows a back view of three wind turbine blades.
- Wind turbine consisting of a rotor (1) blades (2) and hemispherical dimples (3) which are implemented, depending on blade's surface size, at a highest number and at an ideal effectual size, arranged on blade's surface in rows, as much as closer to one another and alternately among them resulting to be tangential, and finally the wind turbine tower (4).
- blade's surfaces have been implemented same sized hemispherical shaped dimples only, not however prohibited the implementation of a polygonal shaped dimple arrangement only (e.g. hexagonal shaped dimples) arranged on the basis of hemispherical dimple arrangement technique in order to be as close as possible to one another, in rows and alternately among them resulting to be tangential and thus, covering totally blade's surface both on the front and on the back side.
- a polygonal shaped dimple arrangement only e.g. hexagonal shaped dimples
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
Wind turbine blades (2) which are characterised from being equipped with dimples (3) of hemispherical or polygonal shape as many as possible of them and as much as closer one another arranged in rows and alternately between them alongside blade's whole surface. Applying this dimple arrangement technique on blade's surface, a drastic management of specific aerodynamic phenomena contributing to the most possible wind laminar flow and steady blade rotation maximizing quality, reliability, economically and noiseless wind turbine operation which because of diffusion at a significant degree of the two side pressure difference, a speedier rotation is succeeded (more rounds per minute) finally maximizing electric energy production.
Description
WIND TURBINE BLADES WITH DIMPLES
The invention refers to a technique applied on horizontal axis wind turbine blades which are placed on the rotor, on wind turbine's tower. Wind turbines of such type with blades are known, made from known materials such as light plastic reinforced with glass, aluminum, thin wooden layers, etc. The back side of these blades is more curved than the front side. After length, which is of crucial contribution for wind turbine's performance, other factors such as width, thickness and weight are as well contributing for maximizing their rotation which is characterized from a concession between the need for aero dynamical design and durability.
Wind turbine blades are designed and manufactured in a particular way, placed on rotor in order to take advantage the most out of the passing, through them, wind energy that causes their rotational motion. Through blade rotation on the axis, conversion is occurred, through the generator, from motional (rotational) energy to electrical. Rotation of these blades is caused and conducted by been affected exclusively from the pressure masses and gusts exercised by the wind. Depending on the proportional implemented rotational velocity can be judged either as negative (economically unprofitable or dangerous) or positive (proper and useful). During wind's molecules collision frontally to the rotating blades, wind's velocity declines, creating increased pressure at front blade's side and decreased at its back side, where eddies and vortexes take place. When blades rotate with enough speed, significant eddies and vortexes are created at the back side of them, creating a pressure difference (uneven distribution) affecting negatively rotation, in consequence obstructing both wind's turbine proper operation and performance. Blades accept wind's aero dynamical pressure initially frontally and their rotational motion is caused, thereafter just because of the accrued pressure difference which is mainly expressed at blade's back side, a negative aerodynamical phenomenon (eddies and vortexes) is created, causing speed deceleration and other complications against to an ideal rotation. Accordingly, these consequences comprise an adversely aim for wind turbine operation, not permitting to maximize its performance. The bigger the turbulence caused by the impacted wind onto them, the bigger is the transmitted energy from blades to the wind and vice versa. This energy interaction between blades and wind is the aero dynamical resistance and more specifically it contains the horizontal wind resistance (drag force) and the vertical or dynamical wind uplift (lift force). The horizontal wind resistance (drag force) acts in the contrary to wind direction decelerating blade's rotational rate, causing the pressure difference, a force (expressed as drag form or pressure resistance) is directing from an area with larger pressure (front blade side) towards an area with smaller pressure (back blade side).
The advantage of this invention is that dimples of hemispherical shape are arranged in specific order on the surface of wind turbine blades, a technique transferred directly from the hemispherical or polygonal (e.g. hexagonal) dimples arranged on golf balls. This technique is taking full advantage of the aero dynamical phenomena, managing to the maximum initially the impacted wind on blades frontally, while passing through them and finally on the outgoing wind masses (exiting) from them contributing at these points to a proper and manageable laminar air flow and a steadier blade rotation offering a quality, reliable, economical and silent wind turbine operation.
The reason for transferring gol s ball dimple arrangement technique identically to wind turbine blades surface is to reproduce the formation of the most possible laminar air flow and eventually to manage in the most effective way the attached, incoming and outgoing wind, defusing pressure difference between blade's two sides at the maximum possible degree.
In the case of these wind turbine blades, the outcome is again succeeded, in the form of the fastest possible blade rotation (more rounds per minute) only this time by maximizing electrical energy production. Applying this dimple arrangement technique, alongside blade's both sides surface, wind management is stimulated and simultaneously beneficial maximized, as well as a methodically eddy and vortex relief that tend to accrue, contributing to reduction in the most effective way against the negative impact of horizontal wind resistance (drag force) on blade's back side, reducing drag form. With the specific dimple arrangement technique, wind turbine blades are now performing maximum rotation and manage most effectively the impacted to them and then ingoing through them wind, as well as balancing wind eddies and vortexes, formed at their back side, maximizing lift force. On other words, at the same wind loads now is transmitted to the wind turbine more electric energy, just as in analogue occurs on golf balls where thanks to the already applied and proven successful dimple arrangement technique, either concerning hemispherical or polygonal shaped dimples, applied on its surface, as many and close to one another as possible, in rows and alternately among them, so as covering its surface completely minimizing any flat surfaces, with an equal's strength strike commenced from player's club, a significant larger distance is covered in comparison to older golf balls that had their surface smooth. Accordingly, at a specific wind force manifested on wind turbine blades surface, where the specific dimple arrangement technique is applied, at an exact layout as in golf balls, then blade's rotational maximization is eventually succeeded. Wind turbine blades, according to the present invention are characterized by being applied on their surface precisely the dimple arrangement technique of golf balls, covering either their surface totally or just the back side only, in order for the drag force phenomenon only to be encountered effectively.
A simple way for presenting this particular dimple arrangement technique on wind turbine blades is made according to the invention by using as many as possible (the dimple number is in ratio to the surface covered) hemispherical or polygonal (e.g. hexagonal) shaped dimples arranged as much as closer to one another, in rows and alternately among them resulting to be tangential, covering totally both blade's surfaces exploiting and managing to the most beneficial degree the aerodynamic phenomena occurred during wind's frontal impact at the front side as well as during wind's movement towards the back side maximizing lift force and at the same time eliminating the negative and retarding pressure (drag force).
Applying this relatively cheap dimple arrangement technique on existing blades surface as well as by constructing from now on new such a type blades the ratio between cost to produce and effectiveness in energy production is improved significantly, operating at the same time more noiselessly and in general more trouble free by offering wind turbine simultaneously a more economical, controlled and rewarding operation.
According to the dimple arrangement technique of the present invention, it is permitted on the wind turbine blades surface to be placed hemispherical or polygonal dimples, as many as possible of them, arranged in an as much as closer to one another approach, in rows and alternately among them resulting to be tangential, maximizing laminar air flow and air management displacement, creating less frontal resistance and as a result to maximize lift force causing friction minimization, since next wind mass's molecules are contacting previous air molecules, entrapped in these dimples instead of directly with blade's detrimental smoothly surface or material. Figure 1 shows a front view of three wind turbine blades.
Figure 2 shows a blade's magnification front view.
Figure 3 shows a back view of three wind turbine blades.
A method for applying the dimple arrangement technique on wind turbine blade surfaces is described in reference to the figures. Wind turbine consisting of a rotor (1) blades (2) and hemispherical dimples (3) which are implemented, depending on blade's surface size, at a highest number and at an ideal effectual size, arranged on blade's surface in rows, as much as closer to one another and alternately among them resulting to be tangential, and finally the wind turbine tower (4).
At the figures shown here, on blade's surfaces have been implemented same sized hemispherical shaped dimples only, not however prohibited the implementation of a polygonal shaped dimple arrangement only (e.g. hexagonal shaped dimples) arranged on the basis of hemispherical dimple arrangement technique in order to be as close as possible to one another, in rows and alternately among them resulting to be tangential and thus, covering totally blade's surface both on the front and on the back side.
Claims
Wind turbine blades, with rotor (1) on a wind turbine tower (4) having blades (2) equipped with dimples (3) characterized by their hemispherical or polygonal (e.g. hexagonal) shape only and their arrangement on blade's surface, which is as many as possible and as much closer to one another, in rows and alternately among them so as in this way to be tangential with one another, covering blade's surface totally at both front and back side.
Wind turbine blades equipped with the hemispherical or polygonal shaped dimple arrangement technique according to claim 1 are characterized by the fact that wind turbine blades surface is totally covered for maximum utilization and management of the displaced air masses coming from blade's front side. Wind turbine blades perform to the maximum degree by making use of the aerodynamic advantages accrued from the specific dimple arrangement technique, achieving at the same time minimum friction and air's most laminar flow on these blade's surfaces, as well as through and outgoing them. Due to this technique, pressure difference between blade's front and back side is virtually eliminated, also the rate of drag form is minimized. Result of this technique is the, as much as possible, maximization of blade rotation (more rounds per minute) therefore producing more electric power.
Wind turbine blades equipped with the hemispherical or polygonal shaped dimple arrangement technique according to claim 1 are characterized by the fact that the dimples are arranged at a precise provision covering completely blade's surfaces, so as to maximise wind management, air molecules laminar flow and thorough wind's mass diffusion. Wind turbine blades are now able to utilise and manage to the maximum degree the aerodynamic phenomena occurring from wind's frontal impact on their front side as well as during air molecules transition towards blade's back side maximising lift force, eliminating simultaneously the negative and decelerating pressure of the outgoing wind from blade's back side (drag force).
Wind turbine blades equipped with the hemispherical or polygonal shaped dimple arrangement technique according to claim 1 are characterized by the fact that the specific technique can be applied to blade's back side surface only, so as this technique encounters for drag force minimization only.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011800266921A CN102918263A (en) | 2010-09-01 | 2011-08-10 | Wind turbine blades with dimples |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GR20100100474 | 2010-09-01 | ||
GR20100100474A GR1008803B (en) | 2010-09-01 | 2010-09-01 | Wind generator's blades |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012028890A1 true WO2012028890A1 (en) | 2012-03-08 |
Family
ID=44534493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GR2011/000033 WO2012028890A1 (en) | 2010-09-01 | 2011-08-10 | Wind turbine blades with dimples |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN102918263A (en) |
GR (1) | GR1008803B (en) |
WO (1) | WO2012028890A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD688543S1 (en) | 2012-03-20 | 2013-08-27 | Milwaukee Electric Tool Corporation | Saw blade |
WO2014023739A1 (en) * | 2012-08-09 | 2014-02-13 | New World Energy Enterprises Limited | A blade for a rotary machine |
USD729600S1 (en) | 2014-05-06 | 2015-05-19 | Milwaukee Electric Tool Corporation | Saw blade |
US20150275865A1 (en) * | 2014-03-28 | 2015-10-01 | Rainer Marquardt | Wind Power Station for Rooftops |
US9475141B2 (en) | 2011-08-04 | 2016-10-25 | Milwaukee Electric Tool Corporation | Reciprocating saw blade |
WO2017052371A1 (en) * | 2015-09-21 | 2017-03-30 | Home Turbine B.V. | Device for converting wind energy into at least mechanical energy |
NL1041491B1 (en) * | 2015-09-25 | 2017-04-19 | Home Turbine B V | Device for converting wind energy into at least mechanical energy. |
EP3399182A1 (en) | 2017-05-05 | 2018-11-07 | Nordex Energy GmbH | Low noise rotor blade tip |
CN109386426A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of trailing edge |
CN109386425A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of blade inlet edge |
US10539157B2 (en) | 2015-04-08 | 2020-01-21 | Horton, Inc. | Fan blade surface features |
EP4283114A1 (en) * | 2022-05-26 | 2023-11-29 | Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie | Wind turbine with horizontal rotation axis of a rotor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105089924A (en) * | 2015-08-26 | 2015-11-25 | 陈海花 | Electric generator blade |
CN116753111A (en) * | 2023-08-11 | 2023-09-15 | 南京永乐照明灯饰有限公司 | Composite wind power generation blade with stable speed increasing and high efficiency |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1469198A1 (en) * | 2003-04-17 | 2004-10-20 | Eugen Radtke | Wind energy converter with lift improving surface structure. |
US20060245928A1 (en) * | 2002-10-22 | 2006-11-02 | Manfred Herbst | Wind power unit with structured surfaces for improvement of flow |
WO2006119648A1 (en) * | 2005-05-13 | 2006-11-16 | Arrowind Corporation | Helical wind turbine |
WO2007065434A1 (en) * | 2005-12-05 | 2007-06-14 | Lm Glasfiber A/S | Blade for a wind turbine rotor |
EP2031241A1 (en) * | 2007-08-29 | 2009-03-04 | Lm Glasfiber A/S | Blade for a rotor of a wind turbine provided with barrier generating means |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4872484A (en) * | 1988-12-12 | 1989-10-10 | John Hickey | System for controlling the flow of a fluid medium relative to an object |
US7604461B2 (en) * | 2005-11-17 | 2009-10-20 | General Electric Company | Rotor blade for a wind turbine having aerodynamic feature elements |
-
2010
- 2010-09-01 GR GR20100100474A patent/GR1008803B/en active IP Right Grant
-
2011
- 2011-08-10 CN CN2011800266921A patent/CN102918263A/en active Pending
- 2011-08-10 WO PCT/GR2011/000033 patent/WO2012028890A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060245928A1 (en) * | 2002-10-22 | 2006-11-02 | Manfred Herbst | Wind power unit with structured surfaces for improvement of flow |
EP1469198A1 (en) * | 2003-04-17 | 2004-10-20 | Eugen Radtke | Wind energy converter with lift improving surface structure. |
WO2006119648A1 (en) * | 2005-05-13 | 2006-11-16 | Arrowind Corporation | Helical wind turbine |
WO2007065434A1 (en) * | 2005-12-05 | 2007-06-14 | Lm Glasfiber A/S | Blade for a wind turbine rotor |
EP2031241A1 (en) * | 2007-08-29 | 2009-03-04 | Lm Glasfiber A/S | Blade for a rotor of a wind turbine provided with barrier generating means |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9475141B2 (en) | 2011-08-04 | 2016-10-25 | Milwaukee Electric Tool Corporation | Reciprocating saw blade |
US10226829B2 (en) | 2011-08-04 | 2019-03-12 | Milwaukee Electric Tool Corporation | Reciprocating saw blade |
USD723892S1 (en) | 2012-03-20 | 2015-03-10 | Milwaukee Electric Tool Corporation | Saw blade |
USD688543S1 (en) | 2012-03-20 | 2013-08-27 | Milwaukee Electric Tool Corporation | Saw blade |
WO2014023739A1 (en) * | 2012-08-09 | 2014-02-13 | New World Energy Enterprises Limited | A blade for a rotary machine |
US20150275865A1 (en) * | 2014-03-28 | 2015-10-01 | Rainer Marquardt | Wind Power Station for Rooftops |
US9777712B2 (en) * | 2014-03-28 | 2017-10-03 | Rainer Marquardt | Wind power station for rooftops |
USD729600S1 (en) | 2014-05-06 | 2015-05-19 | Milwaukee Electric Tool Corporation | Saw blade |
US10539157B2 (en) | 2015-04-08 | 2020-01-21 | Horton, Inc. | Fan blade surface features |
US10662975B2 (en) | 2015-04-08 | 2020-05-26 | Horton, Inc. | Fan blade surface features |
WO2017052371A1 (en) * | 2015-09-21 | 2017-03-30 | Home Turbine B.V. | Device for converting wind energy into at least mechanical energy |
NL1041491B1 (en) * | 2015-09-25 | 2017-04-19 | Home Turbine B V | Device for converting wind energy into at least mechanical energy. |
EP3399182A1 (en) | 2017-05-05 | 2018-11-07 | Nordex Energy GmbH | Low noise rotor blade tip |
CN109386426A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of trailing edge |
CN109386425A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of blade inlet edge |
EP4283114A1 (en) * | 2022-05-26 | 2023-11-29 | Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie | Wind turbine with horizontal rotation axis of a rotor |
Also Published As
Publication number | Publication date |
---|---|
GR20100100474A (en) | 2012-04-30 |
CN102918263A (en) | 2013-02-06 |
GR1008803B (en) | 2016-07-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2012028890A1 (en) | Wind turbine blades with dimples | |
US20110027084A1 (en) | Novel turbine and blades | |
US8373294B2 (en) | Vertical axis wind turbine | |
US20080085179A1 (en) | Wind power converting apparatus and method | |
JP2013540934A (en) | Twin turbine system with optimized blades and tracking wind / water for wind and / or hydraulic power | |
JP6067130B2 (en) | Wind power generator | |
CA2886731A1 (en) | Multiple blade wind turbine | |
JP2012505332A5 (en) | ||
US9062650B2 (en) | Wells turbine having passive rotor blade displacement | |
JP2008025518A (en) | Wind turbine generator | |
CA2690740A1 (en) | Wind turbine blade | |
US8282339B2 (en) | Vertical axis turbine | |
CN106286122A (en) | A kind of band bilayer lift strengthens and rises the vertical axis windmill hindering automatic switching foil | |
CA2918621A1 (en) | Wind turbine with blades at dihedral angles (psp) | |
US20160169197A1 (en) | Wind turbine | |
CN111194382A (en) | Wind turbine | |
KR101514769B1 (en) | Vertical Axis Wind Power Equipment | |
GB2498973A (en) | Turbine scoop formed from a plurality of spaced flat plates | |
KR100654246B1 (en) | Windmill for a wind power generator | |
TWI554682B (en) | Device of passively modulating blade inclination of small vertical-axis wind turbine | |
JP2005188494A5 (en) | ||
WO2013109133A1 (en) | A wind turbine | |
GB2477750A (en) | Combined vertical and horizontal axis wind generator | |
JP2015166562A (en) | Vertical axis drag type wind turbine capable of preventing its overspeed under strong wind and wind power generator | |
KR101342010B1 (en) | Vertical-axis type wind power generator having improved constant velocity performance |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180026692.1 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11749896 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11749896 Country of ref document: EP Kind code of ref document: A1 |