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WO2012028890A1 - Wind turbine blades with dimples - Google Patents

Wind turbine blades with dimples

Info

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
Grant status
Application
Patent type
Prior art keywords
wind
blades
turbine
blade
technique
Prior art date
Application number
PCT/GR2011/000033
Other languages
French (fr)
Inventor
Emmanuel Michalis
Theodoros Toulas
Original Assignee
Theodoros Toulas
Emmanuel Michalis
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially in wind direction
    • F03D1/06Rotors
    • F03D1/0608Rotors characterised by their form
    • F03D1/0633Rotors characterised by their form of the blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2240/00Components
    • F05B2240/20Rotors
    • F05B2240/30Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/32Characteristics 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 surfaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2250/00Geometry
    • F05B2250/20Geometry three-dimensional
    • F05B2250/24Geometry three-dimensional ellipsoidal
    • F05B2250/241Geometry three-dimensional ellipsoidal spherical
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2250/00Geometry
    • F05B2250/20Geometry three-dimensional
    • F05B2250/28Geometry three-dimensional patterned
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GASES [GHG] EMISSION, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • Y02E10/721Blades or rotors

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.
PCT/GR2011/000033 2010-09-01 2011-08-10 Wind turbine blades with dimples WO2012028890A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GR20100100474 2010-09-01
GR20100100474 2010-09-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201180026692 CN102918263A (en) 2010-09-01 2011-08-10 Wind turbine blades with dimples

Publications (1)

Publication Number Publication Date
WO2012028890A1 true 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 (2)

Country Link
CN (1) CN102918263A (en)
WO (1) WO2012028890A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
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 Apparatus for converting at least wind energy into mechanical energy.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105089924A (en) * 2015-08-26 2015-11-25 陈海花 Electric generator blade

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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

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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

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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

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9475141B2 (en) 2011-08-04 2016-10-25 Milwaukee Electric Tool Corporation Reciprocating saw blade
USD688543S1 (en) 2012-03-20 2013-08-27 Milwaukee Electric Tool Corporation Saw blade
USD723892S1 (en) 2012-03-20 2015-03-10 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
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 Apparatus for converting at least wind energy into mechanical energy.

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