WO2001016482A1 - Blade for a wind turbine - Google Patents
Blade for a wind turbine Download PDFInfo
- Publication number
- WO2001016482A1 WO2001016482A1 PCT/NL2000/000614 NL0000614W WO0116482A1 WO 2001016482 A1 WO2001016482 A1 WO 2001016482A1 NL 0000614 W NL0000614 W NL 0000614W WO 0116482 A1 WO0116482 A1 WO 0116482A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- turbulence
- blade according
- free end
- generating
- Prior art date
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract 3
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements 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
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F05B2240/306—Surface measures
- F05B2240/3062—Vortex generators
-
- 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
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
-
- 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 present invention relates to a blade for a wind turbine or the like, having a part which rotates in a flow of fluid, which blade comprises an attachment end, which is connected to the said wind turbine or such part, and a free end, which is at a distance from the attachment end, the blade comprising, at least in the vicinity of the free end, a profile which is optimized for a flow of fluid (air).
- a blade of this type is generally known, and the flow-optimized profile exhibits considerable similarity to the profile of a standard aircraft wing or propeller blade. This means that, in the direction of movement of the blade, the incoming air firstly encounters a rounded part which on one side merges into a convex part and on the other side merges into a convex or concave part, which meet at a sharp point.
- the incoming air firstly encounters a rounded part which on one side merges into a convex part and on the other side merges into a convex or concave part, which meet at a sharp point.
- other flow-optimized profiles are also conceivable and the precise design of the optimized profile of the blade is not essential to the invention.
- Wind turbines are being designed for increasingly higher outputs. However, it has been found that in wind turbine parks where there are a number of wind turbines there are inexplicable differences in output between the individual wind turbines. Moreover, it has been found that certain turbines sometimes provide a much lower output than ought to be expected on the basis of the prevailing wind. This phenomenon may last for both a very short period (a few hours) and a very long period. This problem has been found to occur in particular in generators designed for a relatively high output, for example from 180 kW and more particularly from 500 kW.
- the object of the present invention is to avoid this drawback and to provide a blade with which it is possible to achieve an output from the corresponding wind turbine which can be successfully predicted in advance, without inexplicable falls in the efficiency.
- this object is achieved in that adjacent to one of the ends, turbulence-generating members are arranged near that side which lies upstream as seen in the direction of movement of the blade.
- the turbulence generators or vortex generators may be arranged on both the pressure side and the suction side of the blade, from the first point of contact between the air flow and the blade. Vortex generators of this type are preferably arranged on the suction side of the blade.
- suction side is understood as meaning the side extending from the upstream stagnation point to the back edge which is under the low pressure.
- the vortex generators in the vicinity of the free end achieve the additional advantage that the noise production is limited. This is because the avoidance of stalling makes it possible to avoid undesirable noise production.
- the vortex generators may comprise any part of any shape which is known in the prior art. They are preferably designed as triangular flaps. More particularly, a series of these generators is arranged on the wing profile. This series may have a common base.
- the length of each generator that is to say the distance which it has in common with the adjoining surface of the wing profile, is approximately 3% of the chord length of the wing profile at this location.
- the chord is the distance between the front and rear points (in a straight line) of the curve which runs through the profile and is at an equal distance from the underside and the top side of the blade.
- the length value referred to here is only an example. The same applies to the height.
- the latter is approximately 1% of the chord length.
- Height is understood as being the distance over which the flap extends from the surface of the blade. In practice, this will mean that a height of this nature is at most 10 cm.
- the distance between two vortex generators in a series may be selected as a function of the flow conditions and is, for example, 1/10 of the chord length described above.
- a further advantage involved with positioning the vortex generators in the vicinity of the tip is that it has been found that the installation of vortex generators means that the output does not fall suddenly even at high wind speeds.
- vortex generators In addition to the arrangement of vortex generators, it has been found that it is also possible to reduce a sudden loss in efficiency by allowing the free end of the blade to extend in the upstream direction.
- the distance over which the free end runs upstream is preferably of the order of magnitude of the chord length of the blade at the location of the bending point.
- the effect of vortex generators may also be achieved by air jets arranged at an angle; a flow of air is blown outwards through small holes in the profile, at an angle to the principal flow.
- Fig. 1 shows a very diagrammatic view of a very general structure of a wind turbine provided with two blades
- Fig. 2 shows the detail given in Fig. 1 ;
- Fig. 3 shows a blade in accordance with Fig. 1 in which the vortex generators are shown positioned on the suction side; and Fig. 4 shows a detailed view, similar to that of Fig. 2, of an amended embodiment of the end of the blade.
- a wind turbine is denoted overall by 1. It comprises a conventional post on which a machine housing 2 is arranged. From this there extends a shaft (not shown in more detail) which is coupled to a hub 3, to which two blades 4 are attached by means of the associated attachment end 8. The free end of the blades is denoted by 9.
- the length of the blades provided with a particular flow profile is indicated by L.
- the attachment part 8 will generally comprise a simple cylindrical pipe which merges smoothly into flow profile L.
- length L is selected as a function of the output to be generated by the wind turbine.
- An example which may be mentioned is a value of between 5 and 100 metres. According to the invention, particular measures are taken in the encircled region but also outside this region.
- This region is shown in more detail in Fig. 2. From this figure, it can be seen that the height of this region is 1 and this height is preferably less than 20% of the length L of the blade.
- the pressure side is indicated by 6, while the suction side is indicated by 5.
- the upstream side is 10 and the downstream side is 11.
- turbulence-generating generators 12 and 13 in the vicinity of the upstream side there are two series of turbulence-generating generators 12 and 13.
- these generators are triangular flaps which have a common base part. They may, for example, be prefabricated as lengths of 1 metre.
- These vortex generators are preferably in any case arranged on side 5 and may in addition be arranged on side 6.
- a single series is shown each time, but it is also possible to use a number of series which are parallel to one another or even to have an arbitrary arrangement within a defined region.
- Vortex generators of this type preferably consist of flexible material, so that during transport they can easily be pressed against the corresponding blade without permanent damage occurring while it is ensured that they spring back into the desired position.
- Vortex generator patterns of this nature enables the stability of the blade to be improved considerably under different wind conditions, and a more successfully predictable output and improved efficiency can be obtained without a sudden fall in efficiency for a relatively long or short time.
- Vortex generators may comprise any material which is known in the prior art. They may, for example, be aluminium parts which are 0.5 mm thick.
- Fig. 4 shows a further measure which can be used optionally in combination with the measures shown in Figs. 2 and 3. The free end of the blade is bent towards the arriving flow. The length of this bent end is denoted by N and approximately corresponds to the length of the chord C at the location of the said bending point. It should be understood that this measure can be used both in combination with the vortex generators described above and as a stand-alone measure, that is to say without the presence of turbulence-generating generators of this nature in the vicinity of one of the ends.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU73243/00A AU7324300A (en) | 1999-09-01 | 2000-09-01 | Blade for a wind turbine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1012949 | 1999-09-01 | ||
NL1012949A NL1012949C2 (en) | 1999-09-01 | 1999-09-01 | Blade for a wind turbine. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001016482A1 true WO2001016482A1 (en) | 2001-03-08 |
Family
ID=19769812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NL2000/000614 WO2001016482A1 (en) | 1999-09-01 | 2000-09-01 | Blade for a wind turbine |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7324300A (en) |
NL (1) | NL1012949C2 (en) |
WO (1) | WO2001016482A1 (en) |
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WO2008113349A2 (en) * | 2007-03-20 | 2008-09-25 | Vestas Wind Systems A/S | Slow rotating wind turbine rotor with slender blades |
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WO2009026928A2 (en) * | 2007-08-31 | 2009-03-05 | Lm Glasfiber A/S | Wind turbine blade with submerged boundary layer control means |
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GB2466478A (en) * | 2008-12-02 | 2010-06-30 | Aerovortex Mills Ltd | Suction generation device |
CN101865081A (en) * | 2010-07-01 | 2010-10-20 | 北京大学 | Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof |
CN102187092A (en) * | 2008-09-19 | 2011-09-14 | 考特能源有限公司 | Wind turbine with low induction tips |
US8047801B2 (en) | 2010-06-23 | 2011-11-01 | General Electric Company | Wind turbine blades with aerodynamic vortex elements |
US8061986B2 (en) | 2010-06-11 | 2011-11-22 | General Electric Company | Wind turbine blades with controllable aerodynamic vortex elements |
US8167554B2 (en) | 2011-01-28 | 2012-05-01 | General Electric Corporation | Actuatable surface features for wind turbine rotor blades |
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EP2484898A1 (en) * | 2011-02-04 | 2012-08-08 | LM Wind Power A/S | Vortex generator device with tapered sections for a wind turbine |
EP2484895A1 (en) * | 2011-02-04 | 2012-08-08 | LM Wind Power A/S | Vortex generator vane pair with trapezium-shaped base |
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US20150010407A1 (en) * | 2013-07-08 | 2015-01-08 | Alonso O. Zamora Rodriguez | Reduced noise vortex generator for wind turbine blade |
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US20150361951A1 (en) * | 2014-06-17 | 2015-12-17 | Siemens Energy, Inc. | Pressure side stall strip for wind turbine blade |
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US20160252073A1 (en) * | 2007-08-29 | 2016-09-01 | Lm Glasfiber A/S | Blade for a rotor of a wind turbine provided with barrier generating means |
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EP2007981B1 (en) | 2006-04-02 | 2021-01-20 | Wobben Properties GmbH | Wind turbine with slender blade |
US10974818B2 (en) | 2011-07-22 | 2021-04-13 | Lm Wind Power A/S | Vortex generator arrangement for an airfoil |
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WO2008113349A3 (en) * | 2007-03-20 | 2009-02-26 | Vestas Wind Sys As | Slow rotating wind turbine rotor with slender blades |
WO2008113350A3 (en) * | 2007-03-20 | 2009-02-05 | Vestas Wind Sys As | Wind turbine blades with vortex generators |
WO2008113350A2 (en) * | 2007-03-20 | 2008-09-25 | Vestas Wind Systems A/S | Wind turbine blades with vortex generators |
US7914259B2 (en) | 2007-03-20 | 2011-03-29 | Vestas Wind Systems A/S | Wind turbine blades with vortex generators |
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US20090028718A1 (en) * | 2007-07-20 | 2009-01-29 | Peder Bay Enevoldsen | Wind turbine rotor blade and pitch regulated wind turbine |
US20160252073A1 (en) * | 2007-08-29 | 2016-09-01 | Lm Glasfiber A/S | Blade for a rotor of a wind turbine provided with barrier generating means |
CN101883922A (en) * | 2007-08-31 | 2010-11-10 | Lm玻璃纤维制品有限公司 | Wind turbine blade with submerged boundary layer control means comprisin crossing sub-channels |
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