DK164925B - WINGS TO A WINDMILL - Google Patents
WINGS TO A WINDMILL Download PDFInfo
- Publication number
- DK164925B DK164925B DK167690A DK167690A DK164925B DK 164925 B DK164925 B DK 164925B DK 167690 A DK167690 A DK 167690A DK 167690 A DK167690 A DK 167690A DK 164925 B DK164925 B DK 164925B
- Authority
- DK
- Denmark
- Prior art keywords
- blade
- angle
- section
- rotor
- cross
- Prior art date
Links
- 230000007423 decrease Effects 0.000 claims description 6
- 230000001427 coherent effect Effects 0.000 description 1
- 238000005259 measurement 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
- F03D1/0641—Rotors characterised by their aerodynamic shape of the blades of the section profile of the blades, i.e. aerofoil profile
-
- 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
- F05B2240/301—Cross-section characteristics
-
- 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)
- Physics & Mathematics (AREA)
- Fluid Mechanics (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)
- Wind Motors (AREA)
Description
DK 164925 BDK 164925 B
Opfindelsen angår en vinge til en vindmølle, hvor vinklen 5 mellem rotorplanet og korden i et givet tværsnit af vingen aftager hovedsageligt ensformigt med tværsnittets afstand fra rotoraksen eller er konstant.The invention relates to a blade for a wind turbine, where the angle 5 between the rotor plane and the cord in a given cross-section of the blade decreases substantially uniformly with the cross-section distance from the rotor axis or is constant.
To eller tre sådanne vinger anbringes i ensartet vinkelaf-10 stand på et nav til dannelse af en vindrotor, der af vinden bringes til at rotere om en rotorakse, så vingerne roterer i et plan, rotationsplanet eller rotorpianet.Two or three such blades are placed at a uniform angular distance on a hub to form a wind rotor caused by the wind to rotate about a rotor axis so that the blades rotate in a plane, plane of rotation or rotor pian.
Det vil være bekendt, at vingerne til en vindmølle under 15 driften udsender en betydelig støj, som i væsentlig grad stammer fra den radialt yderste ende af vingen, der i det følgende kaldes for vingetippen, og den af vingetippen frembragte såkaldte tiphvirvel.It will be known that the blades for a wind turbine during operation emit considerable noise, which is substantially derived from the radially outermost end of the blade, hereinafter referred to as the blade tip, and the so-called tip swirl produced by the blade tip.
20 Ved vindmøllevinger er vingernes tværsnit vredet i forhold til rotorplanet på en sådan måde, at korden i et vilkårligt tværsnit af vingen danner en vinkel med det nævnte plan. Denne vinkel beregnes ud fra betragtninger over, hvordan den optimale indfaldsvinkel kan opnås. For en vindmølle med 25 konstant omløbstal er vingen optimal ved en bestemt vindhastighed, og det er ved denne vindhastighed, at beregningen er udført.In the case of wind turbine blades, the cross-section of the blades is distorted with respect to the rotor plane in such a way that the cord forms at any cross-section of the blade an angle with said plane. This angle is calculated from considerations of how the optimum angle of approach can be obtained. For a wind turbine with 25 constant orbital numbers, the blade is optimal at a certain wind speed, and it is at this wind speed that the calculation is performed.
Herved vil belastningen nær vingetippen være relativt stor 30 og trykforskellen mellem vingens tryk- og sugeside tilsvarende stor. Desværre er der den ulempe, at vingen og især vingetippen udsender en tilsvarende stor støj.Hereby, the load near the blade tip will be relatively large and the pressure difference between the pressure and suction side of the blade will be correspondingly large. Unfortunately, there is the disadvantage that the wing and especially the wing tip emit a correspondingly large noise.
Det er formålet med opfindelsen at angive en udformning af 35 en vindmøllevinge, så den udsendte støj kan reduceres.It is the object of the invention to provide a design of a wind turbine blade so that the noise emitted can be reduced.
DK 164925BDK 164925B
22
Dette formål opnås med en vindmøllevinge af den indledningsvist angivne art, hvilken vinge ifølge opfindelsen er særegen ved, at vinklen mellem rotorplanet og korden i et givet tværsnit af vingen på dennes yderste del indstilles 5 sådan, at opdriften på vingens yderste del begrænses eller går mod 0 på tippen.This object is achieved with a wind turbine blade of the type specified initially, which blade according to the invention is peculiar in that the angle between the rotor plane and the cord in a given cross-section of the blade on its outer part is adjusted such that the buoyancy on the outer part of the blade is limited or goes against 0 on the tip.
Ved en vindmøllevinge, som er udformet på den angivne, måde, vil det opnås, at belastningerne nær vingetippen bliver om-10 trent 0 og at trykforskellen mellem tryk- og sugeside bliver meget lille, hvorved den energi, der tabes i vingens tiphvirvel, reduceres. Dette medfører, at tipstøjen vil blive meget begrænset.By a wind turbine blade designed in the manner indicated, it will be achieved that the loads near the blade tip become approximately 0 and that the pressure difference between the pressure and suction side becomes very small, thereby reducing the energy lost in the blade tip swirl. . As a result, the tip noise will be very limited.
15 Dette opnås fordelagtigt ved at forøge den nævnte vinkel til en værdi på ca. 5° ved tippen.This is advantageously achieved by increasing the said angle to a value of approx. 5 ° at the tip.
Vingens yderste del omfatter med fordel de radialt yderste 15-20 % af vingens samlede længde.The outer part of the blade advantageously comprises the radially outer 15-20% of the total length of the blade.
2020
Vindmøllevingen ifølge opfindelsen vil blive forklaret nærmere i det følgende under henvisning til tegningen, hvor: fig. la, b og c viser en vindmøllevinge, set vinkelret på 25 vingens rotationsplan, tangentielt i dette plan og vinkelret på vingens længdeakse henholdsvis radialt udefra indefter i nævnte plan, og fig. 2 viser et vilkårligt tværsnit i den i fig. 1 af- 30 bildede vinge.The wind turbine blade according to the invention will be explained in more detail below with reference to the drawing, in which: 1a, b and c show a wind turbine blade, viewed perpendicular to the plane of rotation of the blade, tangentially in this plane and perpendicular to the longitudinal axis of the blade, respectively radially from the outside inwardly in said plane, and fig. 2 shows an arbitrary cross-section in the embodiment of FIG. 1 formed wing.
I fig. 1 er angivet en vindmøllevinge 1, hvis i vindmøllevingens 1 brugsstilling radialt yderste ende 2 udgør den såkaldte vingetip.In FIG. 1, a wind turbine blade 1 is indicated if the radially outermost end 2 of the wind turbine blade 1 constitutes the so-called blade tip.
Vindmøllevingen 1 har en i forhold til dens rotationsret- 35The wind turbine blade 1 has one in relation to its direction of rotation
DK 164925BDK 164925B
3 ning en i det væsentlige retlinet forkant 3 og en modstående bagkant 4, der hovedsageligt forløber skråt frem og udefter mod vingetippen 2, så vingens bredde set vinkelret ind mod rotorplanet aftager udefter. Vingen 1 har, som det 5 kan erkendes af fig. Ib, en forholdsvis flad side 5, den såkaldte vind- eller trykside, og en relativt krum side 6, der danner vingens sugeside.3 shows a substantially rectilinear leading edge 3 and an opposing trailing edge 4, which extends substantially obliquely forward and outward toward the blade tip 2, so that the width of the blade seen perpendicular to the rotor plane decreases outwardly. The wing 1 has, as can be recognized by FIG. 1b, a relatively flat side 5, the so-called wind or pressure side, and a relatively curved side 6, forming the suction side of the wing.
På fig. 2 er med henvisningsbetegnelsen 7 angivet korden i 10 et vilkårligt tværsnit af vingen 1, og med 8 er angivet rotorplanet for vingen eller for vindrotoren. Korden 7 danner en vinkel α med rotorplanet 8, og størrelsen af denne vinkel aftager ved den kendte vinge 1 med tiltagende afstand fra rotoraksen, så vinkel α ved vingetippen 2 er 0.In FIG. 2, with the reference numeral 7, the chord of 10 is an arbitrary cross-section of the blade 1, and with 8 the rotor plane of the blade or of the wind rotor is indicated. The chord 7 forms an angle α with the rotor plane 8, and the size of this angle decreases at the known wing 1 with increasing distance from the rotor axis, so the angle α at the wing tip 2 is 0.
15 På fig. la er der med stiplede linier antydet ni forskellige tværsnit i vingen 1, idet tværsnittenes radiale afstand fra rotoraksen fremgår af de efterfølgende tabeller 1 og 2, der viser nogle sammenhængende forhold for de enkelte 20 tværsnit for en kendt vinge, der markedsføres under betegnelsen Aerostar 9 m, henholdsvis for en vinge ifølge den foreliggende opfindelse.15 In FIG. 1a, nine dotted lines indicate nine different cross sections in the wing 1, the radial distance of the cross sections from the rotor axis is shown in the following tables 1 and 2, showing some coherent relationships for the individual 20 cross sections for a known wing marketed under the designation Aerostar 9 m, respectively, for a blade according to the present invention.
I tabellerne angiver c vingens 1 bredde for hver af de an-25 givne radier, t angiver vingens tykkelse i forhold til korden 7 ved den pågældende radius , og α den vinkel, som kor den i det pågældende tværsnit danner med vindrotorens rotationsplan.In the tables, indicate the width of the blade 1 for each of the indicated radii, t indicates the thickness of the blade relative to the chord 7 at that radius, and α represents the angle which it corresponds to in the particular cross-section with the rotation plane of the wind rotor.
30 Det vil ses i tabel 1, at vinklen α mellem korden 7 og rotorplanet 8 i et givet tværsnit i den kendte vinge aftager hovedsageligt ensformigt med tværsnittets voksende afstand fra rotoraksen.30 It will be seen in Table 1 that the angle α between the cord 7 and the rotor plane 8 in a given cross-section of the known wing decreases substantially uniformly with the increasing distance of the cross-section from the rotor axis.
35 Med denne udformning af vingen 1 vil der bestå en forholdsvis stor trykforskel mellem vingens 1 tryk- og sugeside 5With this design of the blade 1, there will be a relatively large pressure difference between the pressure and suction side of the blade 1
DK 164925BDK 164925B
4 henholdsvis 6, hvilket hidtil har været anset som en fordel, da man mente, at man herved kunne opnå en bedre virkningsgrad for vingen 1.4 and 6, respectively, which has hitherto been considered an advantage, since it was believed that a better efficiency could be achieved for the wing 1.
5 Det ser ud til på baggrund af nyere målinger, at denne traditionelle udformning af en vindmøllevinge ikke bidrager så meget til vindmøllens produktion, som man tidligere har regnet med, sandsynligvis fordi tiphvirvlen forstyrrer den optimale strømning over vingens 1 yderste del.5 It seems, on the basis of recent measurements, that this traditional design of a wind turbine blade does not contribute as much to wind turbine production as was previously expected, probably because the tip vortex interferes with the optimal flow over the outermost part of the blade.
1010
Det vil ses i tabel 2, at vinklen a mellem korden og rotorplanet i et givet tværsnit aftager hovedsageligt ensformigt med tværsnittets voksende afstand fra rotoraksen i de første snit, men at denne vinkel derefter vokser påny på en 15 sådan måde, at vingetippen er vredet tilbage.It will be seen in Table 2 that the angle a between the cord and the rotor plane in a given cross section decreases substantially uniformly with the increasing distance of the cross section from the rotor axis in the first section, but that this angle then grows again in such a way that the blade tip is twisted back .
Tabel 1.Table 1.
Radius 9,74 m, antal snit 9.Radius 9.74 m, number of sections 9.
2020
Radius (m) c (m) t (%) a (°) 1,84 1,36 25,0 16,0 2.74 1,27 23,8 13.0 3.74 1,17 22,4 9,5 25 4,74 1,07 21,0 7,0 5.74 0,97 19,6 4,5 6.74 0,88 18,2 3,0 7.74 0,78 16,8 2,0 8.74 0,68 15,4 1,0 30 9,74 0,58 14,0 0,0Radius (m) c (m) t (%) a (°) 1.84 1.36 25.0 16.0 2.74 1.27 23.8 13.0 3.74 1.17 22.4 9.5 25 4.74 1.07 21.0 7.0 5.74 0.97 19.6 4.5 6.74 0.88 18.2 3.0 7.74 0.78 16.8 2.0 8.74 0.68 15.4 1.0 30 9.74 0.58 14.0 0.0
DK 164925 BDK 164925 B
55
Tabel 2.Table 2.
Radius 9,74 m, antal snit 9.Radius 9.74 m, number of sections 9.
5 Radius (m) c(m) t(%) ct (°) 1,84 1,36 25,0 16,0 2.74 1,27 23,8 13.0 3.74 1,17 22,4 9,5 4.74 1,07 21,0 7,0 10 5,74 0,97 19,6 4,5 6.74 0,88 18,2 3,0 7.74 0,78 16,8 2,0 8.74 0,68 15,4 1,5 9.74 0,58 14,0 5,0 15Radius (m) c (m) t (%) ct (°) 1.84 1.36 25.0 16.0 2.74 1.27 23.8 13.0 3.74 1.17 22.4 9.5 4.74 1, 07 21.0 7.0 10 5.74 0.97 19.6 4.5 6.74 0.88 18.2 3.0 7.74 0.78 16.8 2.0 8.74 0.68 15.4 1.5 9.74 0.58 14.0 5.0 15
Claims (3)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK167690A DK164925B (en) | 1990-07-11 | 1990-07-11 | WINGS TO A WINDMILL |
| PCT/DK1991/000201 WO1992001156A1 (en) | 1990-07-11 | 1991-07-11 | A wing for a windmill |
| AU82346/91A AU8234691A (en) | 1990-07-11 | 1991-07-11 | A wing for a windmill |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK167690 | 1990-07-11 | ||
| DK167690A DK164925B (en) | 1990-07-11 | 1990-07-11 | WINGS TO A WINDMILL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK167690D0 DK167690D0 (en) | 1990-07-11 |
| DK167690A DK167690A (en) | 1992-01-12 |
| DK164925B true DK164925B (en) | 1992-09-07 |
Family
ID=8107119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK167690A DK164925B (en) | 1990-07-11 | 1990-07-11 | WINGS TO A WINDMILL |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU8234691A (en) |
| DK (1) | DK164925B (en) |
| WO (1) | WO1992001156A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2265672B (en) * | 1992-03-18 | 1995-11-22 | Advanced Wind Turbines Inc | Wind turbines |
| ES2261100B1 (en) * | 2006-03-29 | 2007-08-01 | Gamesa Corporacion Tecnologica, S.A. | ANTI-NOISE AEROGENERATOR. |
| EP2187045A4 (en) * | 2007-11-19 | 2013-01-02 | Mitsubishi Heavy Ind Ltd | Windmill blade and wind power generator using same |
| US8408877B2 (en) * | 2008-05-30 | 2013-04-02 | General Electric Company | Wind turbine blades with twisted tips |
| US9797368B2 (en) | 2008-09-19 | 2017-10-24 | Cortenergy Bv | Wind turbine with low induction tips |
| GB2476509A (en) * | 2009-12-24 | 2011-06-29 | Rolls Royce Plc | Turbine with reduced thrust coefficient at excessive speed |
| PL2834517T3 (en) | 2012-03-13 | 2020-11-02 | Wobben Properties Gmbh | Twisted blade root |
| US20190072068A1 (en) * | 2017-09-07 | 2019-03-07 | General Electric Company | Methods for Mitigating Noise during High Wind Speed Conditions of Wind Turbines |
| US11781522B2 (en) | 2018-09-17 | 2023-10-10 | General Electric Company | Wind turbine rotor blade assembly for reduced noise |
| EP3763937A1 (en) * | 2019-07-11 | 2021-01-13 | FlowGen Development & Management GmbH | Rotor blade for a wind turbine and wind turbine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4297076A (en) * | 1979-06-08 | 1981-10-27 | Lockheed Corporation | Wind turbine |
| SE442659B (en) * | 1984-01-13 | 1986-01-20 | Stubinen Utvecklings Ab | WIND rotor element |
-
1990
- 1990-07-11 DK DK167690A patent/DK164925B/en active IP Right Grant
-
1991
- 1991-07-11 AU AU82346/91A patent/AU8234691A/en not_active Abandoned
- 1991-07-11 WO PCT/DK1991/000201 patent/WO1992001156A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1992001156A1 (en) | 1992-01-23 |
| DK167690A (en) | 1992-01-12 |
| DK167690D0 (en) | 1990-07-11 |
| AU8234691A (en) | 1992-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PHS | Application shelved for other reasons than non-payment | ||
| B1 | Patent granted (law 1993) |