DE4440744A1 - Wind turbine generator rotor blade - Google Patents
Wind turbine generator rotor bladeInfo
- Publication number
- DE4440744A1 DE4440744A1 DE4440744A DE4440744A DE4440744A1 DE 4440744 A1 DE4440744 A1 DE 4440744A1 DE 4440744 A DE4440744 A DE 4440744A DE 4440744 A DE4440744 A DE 4440744A DE 4440744 A1 DE4440744 A1 DE 4440744A1
- Authority
- DE
- Germany
- Prior art keywords
- rotor blade
- tip
- rotor
- optimizing
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004020 conductor Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004804 winding Methods 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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
-
- 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
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
Description
Die Erfindung betrifft ein Rotorblatt eines Rotors für Windkraftanlagen.The invention relates to a rotor blade of a rotor for Wind turbines.
Bei der aktuellen technologischen Verbesserung und Weiter entwicklung von modernen Windkraftanlagen (WKA) bestehen die wesentlichen Zielsetzungen darin, einerseits die Wirt schaftlichkeit zu verbessern, andererseits die Umweltbeein flussung und dabei insbesondere die Geräuschemission zu mini mieren.With the current technological improvement and further development of modern wind turbines (WKA) exist the main objectives in it, on the one hand the host improve efficiency, on the other hand environmental flow and in particular the noise emission to mini lubricate.
Die Wirtschaftlichkeit einer WKA hängt in großem Maße von der spezifischen Turmkopfmasse (kg/installiertes kW) ab. Langsamlaufende Windrotoren erzeugen hohe Drehmomente und benötigen entsprechend steife und schwere Bauteile, ins besondere Getriebe mit hohem Übersetzungsverhältnis und/oder entsprechend aufwendige langsamlaufende Generatoren. Von da her liegt es auf der Hand, die Auslegungsdrehzahlen bzw. die Umfangsgeschwindigkeiten von modernen WKA-Rotoren so hoch wie möglich anzusetzen.The profitability of a wind turbine largely depends on the specific tower head mass (kg / installed kW). Slow-running wind rotors generate high torques and require correspondingly stiff and heavy components, ins special gears with high gear ratio and / or correspondingly expensive slow-running generators. From there here it is obvious, the design speeds or Circumferential speeds of modern wind turbine rotors so high as possible.
Dem steht entgegen, daß mit steigender Umfangsgeschwindigkeit die aerodynamische Geräuschentwicklung an den Rotorblättern zunimmt. Während beim Stand der Technik alle übrigen Maschinen geräusche durch Maßnahmen wie Präzisionsverzahnung, Körper schallentkopplung und Kapselung etc. inzwischen gut beherrsch bar geworden sind, bilden die aerodynamisch bedingten Geräusche am Rotor und insbesondere an den Blattspitzen ein nach wie vor schwer beherrschbares Problem.This is opposed to the fact that with increasing peripheral speed the aerodynamic noise development on the rotor blades increases. While in the state of the art all other machines noise through measures such as precision gearing, body sound decoupling and encapsulation etc. are now well controlled the aerodynamically induced noises form on the rotor and especially at the tips of the blades from difficult to control problem.
Die Aufgabe der Erfindung besteht darin, durch eine be sondere geometrische Gestaltung der Blattspitzen die dort besonders intensiv wirkenden Geräuschentstehungsmechanismen soweit wie möglich zu unterdrücken.The object of the invention is to be special geometric design of the leaf tips there particularly intensive-acting noise generation mechanisms suppress as much as possible.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß im Bereich der Blattspitze des Rotorblattes eine nahezu oder vollständig ummantelte Fläche vorhanden ist, welche derart angeordnet und ausgebildet ist, daß sie von der anströmenden Luft durchströmt wird, ohne einen nennenswerten zusätzlichen Luftwiderstand zu erzeugen. Durch diese Maßnahme wird erreicht, daß in den Randwirbel,der sich bekanntermaßen durch den Druckunterschied zwischen Flügelober- und -unterseite bildet, ein Wirbelkern injiziert wird, dessen Drall konstruktiv vorge geben werden kann. Wenn die Eintrittsöffnung der ummantelten Fläche, vorzugsweise eine Ringfläche, genügend weit von der Vorderkante des Rotorblattes liegt, wird der Drall innerhalb der Ringfläche praktisch gleich Null.According to the invention this object is achieved in that Area of the blade tip of the rotor blade an almost or fully encased surface is present, which is such is arranged and designed so that it flows from the Air flows through without any noteworthy additional To create air resistance. This measure ensures that in the vertebrae, which is known to be characterized by the Forms the pressure difference between the top and bottom of the wing, a vortex core is injected, the swirl of which is structurally provided can be given. If the entry opening of the encased Area, preferably an annular area, sufficiently far from the Front edge of the rotor blade, the twist is inside the ring area practically zero.
Weitere Vorteile und Einzelheiten sollen anhand der Figuren bis 5 erläutert werden.Further advantages and details should be based on the figures to 5 are explained.
Fig. 1 zeigt den Grundriß eines modernen schnelläufigen Rotorblattes 1 nach dem Stand der Technik sowie den an der Blattspitze 2 erzeugten Randwirbel 3. Wesentliche Anteile der aerodynamischen Geräuschbildung entstehen im Kern dieses Wirbels im unmittelbaren Bereich der Blattspitze 2. Fig. 1 shows the outline of a modern schnelläufigen rotor blade 1 according to the prior art as well as the generated at the blade tip vortex edge 2. 3 Substantial parts of the aerodynamic noise generation arise in the core of this vortex in the immediate area of the blade tip 2 .
Fig. 2 zeigt einen Blick auf die Profilvorderkante des Tragflügels (Rotorblattes 1). Der Druckunterschied zwischen Profilober- und -unterseite gleicht sich am Ende des endlichen Flügels aus und läßt den aus der Flugmechanik bekannten Rand wirbel 3 entstehen. Sobald Auftrieb erzeugt wird, kann dieser Wirbel prinzipbedingt nicht verhindert werden, wohl aber kann man versuchen, auf die Drallverteilung innerhalb des Wirbels Einfluß zu nehmen. Fig. 2 shows a view of the profile leading edge of the wing (rotor blade 1 ). The pressure difference between the top and bottom of the profile is equalized at the end of the finite wing and creates the edge vortex 3 known from flight mechanics. As soon as buoyancy is generated, this vortex cannot be prevented by principle, but one can try to influence the swirl distribution within the vortex.
Fig. 3 und 4 zeigen eine besonders kostengünstige Möglich keit der erfindungsgemäßen Blattspitzengestaltung: Ein dünn wandiges Edelstahlrohr 5, welches gleichzeitig auch noch die Funktion eines Blitzableiters übernehmen kann, wird auf die Blattspitze 2 geschraubt. Es bildet eine von der anströmenden Luft durchströmte Ringfläche 6. Rohrdurchmesser D und -länge 1 sowie der Lageparameter α und der Abstand x der Rohrmündung von der Flügelhinterkante müssen in ein optimales Verhältnis zur Blattiefe t gebracht werden, um auch hier den oben be schriebenen Optimalkompromiß zu erreichen. Gestrichelt dar gestellt und mit 5′ und 6′ bezeichnet ist eine weitere Lösung. Es handelt sich um eine nicht vollständig ummantelte Ringfläche 6′ mit dem Restspalt s und mit einem vom Lageparameter der Ringfläche 6 verschiedenen Lageparameter. FIGS. 3 and 4 show a particularly cost possible ness of the blade tip design according to the invention: A thin wall stainless steel tube 5 which at the same time can also take over the function of a lightning rod, is screwed onto the blade tip 2. It forms an annular surface 6 through which the incoming air flows. Pipe diameter D and length 1 as well as the positional parameter α and the distance x of the pipe mouth from the trailing edge of the wing must be brought into an optimal relationship to the depth of the sheet t in order to achieve the optimal compromise described above. Dashed represents and designated 5 'and 6 ' is another solution. It is a not completely encased ring surface 6 'with the remaining gap s and with a different from the position parameter of the ring surface 6 position parameter.
Fig. 5 zeigt, daß als weitere Variable noch der Schränkungs winkel β zwischen der Achse 7 des Rohres 5 und der Profil sehne 8 des Rotorblattes 1 hinzukommt. Fig. 5 shows that as a further variable, the angle of inclination β between the axis 7 of the tube 5 and the chord 8 is added to the rotor blade 1 .
Das Durcharbeiten einer mehrdimensionalen Matrix von Para meterkombinationen zur Optimierung von Geräusch und Luftwider stand ist zwar experimentell aufwendig; aus der Literatur sind jedoch Verfahren bekannt, die den natürlichen Evolutionsprozeß nachahmen und mit deren Hilfe man die Optimierung von komplexen Strömungsvorgängen auf einige wenige Schritte abkürzen kann. Eine von mehreren möglichen Optimierungsaufgaben könnte darin bestehen, den Grad der Aufwicklung (Ummantelung) bzw. die Größe eines Restspaltes "s" herauszufinden, bei denen der beste Kompromiß zwischen Geräuschminderung einerseits und Erhöhung des Luftwiderstandes andererseits liegt.Working through a multi-dimensional matrix of Para Meter combinations to optimize noise and air deflection stand is experimentally complex; are from the literature however, processes are known that affect the natural process of evolution imitate and with whose help one can optimize complex Flow processes can be shortened to a few steps. One of several possible optimization tasks could be in it exist, the degree of winding (sheathing) or the Find out the size of a gap "s" where the best Compromise between noise reduction on the one hand and increase the air resistance, on the other hand.
Da bei der heute gängigen Herstellungsweise von Rotorblättern die Ausformung einer speziellen Blattspitzengestaltung kaum praktikabel erscheint, wird weiterhin vorgeschlagen, eine ge normte Trennstelle 8 im Bereich der Blattspitze einzuführen (siehe auch Fig. 3 und 4). An diese Trennstelle 8 kann dann ein beliebig kompliziert geformter Körper, der nur noch nach aerodynamischen Kriterien gestaltet wurde (und der separat durch Spritzen oder Gießen etc. hergestellt wurde) angeschraubt werden Auch hier bietet sich die Möglichkeit an, durch Verwendung von leitendem Material die Blitzschutzfunktion mit zu übernehmen.Since the shape of a special blade tip design hardly seems practicable in the current production method of rotor blades, it is also proposed to introduce a standardized separation point 8 in the area of the blade tip (see also FIGS. 3 and 4). An arbitrarily complicated shaped body, which was only designed according to aerodynamic criteria (and which was manufactured separately by spraying or pouring, etc.), can then be screwed onto this separation point 8. Here, too, there is the possibility of using the lightning protection function by using conductive material to take over with.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4440744A DE4440744A1 (en) | 1994-11-15 | 1994-11-15 | Wind turbine generator rotor blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4440744A DE4440744A1 (en) | 1994-11-15 | 1994-11-15 | Wind turbine generator rotor blade |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4440744A1 true DE4440744A1 (en) | 1996-05-23 |
Family
ID=6533360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4440744A Withdrawn DE4440744A1 (en) | 1994-11-15 | 1994-11-15 | Wind turbine generator rotor blade |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4440744A1 (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999018352A1 (en) * | 1997-10-02 | 1999-04-15 | Aloys Wobben | Quiet rotor blade and wind energy installation equipped with rotor blades of this type |
DE10300284A1 (en) * | 2003-01-02 | 2004-07-15 | Aloys Wobben | Turbine rotor blade for wind-powered energy plant has tip region curved or angled in direction of rotor blade trailing edge |
WO2004061298A2 (en) | 2003-01-02 | 2004-07-22 | Aloys Wobben | Wind turbine rotor blade with reduced noise emission |
US7866563B2 (en) | 2007-05-25 | 2011-01-11 | Gaming Partners International | Token with electronic device, method of making thereof, and apparatus for making thereof |
US7883408B2 (en) | 2003-05-12 | 2011-02-08 | Gaming Partners International | Station for reading and/or writing in electronic gaming chips |
US7918455B2 (en) | 2005-11-09 | 2011-04-05 | Gaming Partners International | Chip with insert including an electronic microchip |
US7931204B2 (en) | 2005-07-08 | 2011-04-26 | Gaming Partners International | Electronic microchip token and its fabrication process |
DE102009060650A1 (en) * | 2009-12-22 | 2011-06-30 | Keller, Walter, 66994 | Aeroacoustic rotor blade for a wind turbine and wind turbine equipped therewith |
WO2012071679A1 (en) * | 2010-11-30 | 2012-06-07 | General Electric Company | Noise reducer for rotor blade in wind turbine |
EP2722522A1 (en) * | 2012-10-22 | 2014-04-23 | Siemens Aktiengesellschaft | Lightning receptor arrangement for a wind turbine rotor blade |
US8727723B2 (en) | 2010-07-23 | 2014-05-20 | Erico International Corporation | Receptor for wind turbine blade lightning protection |
US20160138570A1 (en) * | 2014-11-13 | 2016-05-19 | Siemens Aktiengesellschaft | Guiding lightning to a lightning receptor |
US9494134B2 (en) | 2013-11-20 | 2016-11-15 | General Electric Company | Noise reducing extension plate for rotor blade in wind turbine |
US10465652B2 (en) | 2017-01-26 | 2019-11-05 | General Electric Company | Vortex generators for wind turbine rotor blades having noise-reducing features |
US10746157B2 (en) | 2018-08-31 | 2020-08-18 | General Electric Company | Noise reducer for a wind turbine rotor blade having a cambered serration |
US10767623B2 (en) | 2018-04-13 | 2020-09-08 | General Electric Company | Serrated noise reducer for a wind turbine rotor blade |
-
1994
- 1994-11-15 DE DE4440744A patent/DE4440744A1/en not_active Withdrawn
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999018352A1 (en) * | 1997-10-02 | 1999-04-15 | Aloys Wobben | Quiet rotor blade and wind energy installation equipped with rotor blades of this type |
DE19743694C2 (en) * | 1997-10-02 | 2001-11-15 | Aloys Wobben | Rotor blade and wind turbine with one rotor blade |
AU744265B2 (en) * | 1997-10-02 | 2002-02-21 | Aloys Wobben | Quiet rotor blade and wind energy installation equipped with rotor blades of this type |
US6398502B1 (en) | 1997-10-02 | 2002-06-04 | Aloys Wobben | Quiet rotor blade and wind energy installation equipped with rotor blades of this type |
WO2004061298A3 (en) * | 2003-01-02 | 2008-06-19 | Aloys Wobben | Wind turbine rotor blade with reduced noise emission |
WO2004061298A2 (en) | 2003-01-02 | 2004-07-22 | Aloys Wobben | Wind turbine rotor blade with reduced noise emission |
EP2469077A2 (en) | 2003-01-02 | 2012-06-27 | Aloys Wobben | Rotor blade for a wind energy facility |
CN100425826C (en) * | 2003-01-02 | 2008-10-15 | 艾劳埃斯·乌本 | Rotor blade for a wind power plant |
US7540716B2 (en) | 2003-01-02 | 2009-06-02 | Aloys Wobben | Rotor blade for a wind power plant |
US7841836B2 (en) | 2003-01-02 | 2010-11-30 | Aloys Wobben | Rotor blade for a wind power plant |
US8241002B2 (en) | 2003-01-02 | 2012-08-14 | Aloys Wobben | Rotor blade for a wind power plant |
DE10300284A1 (en) * | 2003-01-02 | 2004-07-15 | Aloys Wobben | Turbine rotor blade for wind-powered energy plant has tip region curved or angled in direction of rotor blade trailing edge |
US7883408B2 (en) | 2003-05-12 | 2011-02-08 | Gaming Partners International | Station for reading and/or writing in electronic gaming chips |
US7931204B2 (en) | 2005-07-08 | 2011-04-26 | Gaming Partners International | Electronic microchip token and its fabrication process |
US7918455B2 (en) | 2005-11-09 | 2011-04-05 | Gaming Partners International | Chip with insert including an electronic microchip |
US7866563B2 (en) | 2007-05-25 | 2011-01-11 | Gaming Partners International | Token with electronic device, method of making thereof, and apparatus for making thereof |
DE102009060650A1 (en) * | 2009-12-22 | 2011-06-30 | Keller, Walter, 66994 | Aeroacoustic rotor blade for a wind turbine and wind turbine equipped therewith |
US8727723B2 (en) | 2010-07-23 | 2014-05-20 | Erico International Corporation | Receptor for wind turbine blade lightning protection |
WO2012071679A1 (en) * | 2010-11-30 | 2012-06-07 | General Electric Company | Noise reducer for rotor blade in wind turbine |
EP2722522A1 (en) * | 2012-10-22 | 2014-04-23 | Siemens Aktiengesellschaft | Lightning receptor arrangement for a wind turbine rotor blade |
CN103775289A (en) * | 2012-10-22 | 2014-05-07 | 西门子公司 | Lightning receptor device for wind turbine rotor blade |
US9494134B2 (en) | 2013-11-20 | 2016-11-15 | General Electric Company | Noise reducing extension plate for rotor blade in wind turbine |
US20160138570A1 (en) * | 2014-11-13 | 2016-05-19 | Siemens Aktiengesellschaft | Guiding lightning to a lightning receptor |
US10024308B2 (en) * | 2014-11-13 | 2018-07-17 | Siemens Aktiengesellschaft | Guiding lightning to a lightning receptor |
US10465652B2 (en) | 2017-01-26 | 2019-11-05 | General Electric Company | Vortex generators for wind turbine rotor blades having noise-reducing features |
US10767623B2 (en) | 2018-04-13 | 2020-09-08 | General Electric Company | Serrated noise reducer for a wind turbine rotor blade |
US10746157B2 (en) | 2018-08-31 | 2020-08-18 | General Electric Company | Noise reducer for a wind turbine rotor blade having a cambered serration |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE4440744A1 (en) | Wind turbine generator rotor blade | |
DE60032934T2 (en) | TOWER WITH FLOW ACCELERATOR FOR A WIND TURBINE | |
DE69534860T2 (en) | turbine blades | |
DE102009025857A1 (en) | Wind turbine rotor blade floor plans with twisted and tapered tips | |
DE102009060650A1 (en) | Aeroacoustic rotor blade for a wind turbine and wind turbine equipped therewith | |
WO2012164045A1 (en) | Rotor with a curved rotor blade for a wind power plant | |
EP3329120A1 (en) | Wind turbine rotor blade | |
DE10307682A1 (en) | Rotor blade of a wind turbine | |
DE3330899C2 (en) | ||
DE60226318T2 (en) | WIND TURBINE WITH SECONDARY ROTORS | |
DE102012024119A1 (en) | Rotor blade, holding arm and rotor for a vertical axis wind energy system and method for producing | |
EP3844384A1 (en) | Rotor blade, wind turbine, and method for optimising a wind turbine | |
DE102018117398A1 (en) | Rotor blade for a wind turbine and wind turbine | |
DE3127257A1 (en) | Method for reducing the induced drag of a lift-generating wing and a device for carrying it out | |
WO2019086616A1 (en) | Swirling element, aerodynamic profile, and method for producing a swirling element | |
DE102007058274A1 (en) | Sheath current wind converter has gear unit, propeller hub and sheath, which are arranged at upper section of main tower, where sheath is fixed at gear box and encloses external area of single propeller blade | |
DE2636056A1 (en) | Sound reduction device for ducted fan - has curved leading edge on blades to break up resonance points | |
WO2017097669A1 (en) | Autogyro rotor blade | |
WO2020234190A1 (en) | Rotor blade and wind turbine | |
DE102011050462A1 (en) | Wind turbine | |
DE102017114414B3 (en) | Aerodynamic structure, method of making and using such | |
DE102009022537A1 (en) | Wind energy plant for wind park, has mast, rotor with rotor blade and nacelle, where rotation axis of rotor runs through nacelle, and nacelle has flow channel along rotation axis | |
DE102013006203A1 (en) | Rotor blade for wind turbine, comprises profile, which has suction side that is convexly curved in central portion having fixed radius, where central portion of suction side has length, whose projection extends to chord from leading edge | |
DE102006019204A1 (en) | Wind power plant e.g. wind mill, has rotor with blades having front and rear edges, where front edge has round gradient, which is curved towards rear edge over half of its length starting from rotor blade point | |
EP3280910A1 (en) | Wind turbine rotor blade |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |