NO325833B1 - Darrieus turbine - Google Patents
Darrieus turbine Download PDFInfo
- Publication number
- NO325833B1 NO325833B1 NO20070197A NO20070197A NO325833B1 NO 325833 B1 NO325833 B1 NO 325833B1 NO 20070197 A NO20070197 A NO 20070197A NO 20070197 A NO20070197 A NO 20070197A NO 325833 B1 NO325833 B1 NO 325833B1
- Authority
- NO
- Norway
- Prior art keywords
- turbine
- power machine
- coupling
- axis
- darrieus turbine
- Prior art date
Links
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 238000007667 floating Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process 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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B17/00—Other machines or engines
- F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
- F03B17/062—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially at right angle to flow direction
-
- 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
- F05B2240/21—Rotors for wind turbines
- F05B2240/211—Rotors for wind turbines with vertical axis
- F05B2240/212—Rotors for wind turbines with vertical axis of the Darrieus type
-
- 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
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid 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
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/97—Mounting on supporting structures or systems on a submerged structure
-
- 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
- F05B2250/23—Geometry three-dimensional prismatic
- F05B2250/232—Geometry three-dimensional prismatic conical
-
- 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
- F05B2250/40—Movement of component
- F05B2250/41—Movement of component with one degree of freedom
- F05B2250/411—Movement of component with one degree of freedom in rotation
-
- 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
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Anordning ved en i hovedsak dykket darrieusturbin (6) som er koplet til en kraftmaskin (4), idet kraftmaskinen (4) befinner seg på en bærende konstruksjon (2), og hvor darrieusturbinen (6) er svingbart koplet til den bærende konstruksjon (2).Device by a substantially submerged darrieus turbine (6) which is connected to a power machine (4), the power machine (4) being located on a load-bearing structure (2), and wherein the darrieusturbine (6) is pivotally connected to the load-bearing structure (2). ).
Description
DARRIEUS TURBIN DARRIE'S TURBINE
Denne oppfinnelse vedrører en darrieusturbin. Nærmere bestemt dreier det seg om en dykket darrieusturbin som er koplet til en kraftmaskin, hvor kraftmaskinen befinner seg på en bærende konstruksjon, idet darrieusturbinen er svingbart koplet til den bærende konstruksjon. This invention relates to a Darrieus turbine. More specifically, it concerns a submerged Darrieus turbine which is connected to a power machine, where the power machine is located on a supporting structure, the Darrieus turbine being pivotally connected to the supporting structure.
Darrieusturbiner, nedenfor benevnt "turbin", anvendes i en rekke utførelser i fluider som vind og vann. Turbinene roterer, i motsetning til mange andre turbinarter, ofte om en vertikal akse. Turbiner hvor skovlene forløper parallelt med dreieaksen er normalt ikke selvstartende, idet skovlene ikke utøver noe dreiemoment om aksen før de er tildelt en hastig-hetskomponent i retning på tvers av fluidets strømningsret-ning. Darrieus turbines, hereinafter referred to as "turbine", are used in a number of designs in fluids such as wind and water. The turbines, unlike many other types of turbines, often rotate about a vertical axis. Turbines where the blades run parallel to the axis of rotation are normally not self-starting, as the blades do not exert any torque about the axis until they are assigned a velocity component in a direction transverse to the flow direction of the fluid.
Problemet relatert til manglende selvstarting kan i henhold til Alexander M. Gorlov overkommes ved å tildele skovlene en spiralform. US 5133637 viser at noe skråstilte, rette skovler også kan bevirke at turbinen blir selvstartende. According to Alexander M. Gorlov, the problem related to lack of self-starting can be overcome by assigning the vanes a spiral shape. US 5133637 shows that slightly inclined, straight blades can also cause the turbine to self-start.
Dykkede turbiner ifølge kjent teknikk er opphengt på i hovedsak tre ulike måter: De kan være opplagret i et øvre og et nedre lager. Opplag-ringer av denne art betinger en relativ omfattende lager-konstruksjon. Submerged turbines according to known technology are mainly suspended in three different ways: They can be stored in an upper and a lower warehouse. Storage of this kind requires a relatively extensive warehouse construction.
De kan være lagret ved sitt ene endeparti, se for eksempel WO 82/04289. Denne opplagring medfører betydelige bøyekrefter i turbinens drivaksling og i innfestningen ved for eksempel en generator. They can be stored at one end, see for example WO 82/04289. This storage results in significant bending forces in the turbine's drive shaft and in the fastening of, for example, a generator.
Endelig foreslår Gorlov å anbringe turbiner langs et taulignende element som rager mellom sjøbunnen og overflaten. Det er innlysende at et taulignende element bare vil kunne over-føre et ubetydelig dreiemoment. Finally, Gorlov proposes placing turbines along a rope-like element that protrudes between the seabed and the surface. It is obvious that a rope-like element will only be able to transmit a negligible torque.
Oppfinnelsen har til formål å avhjelpe eller å redusere i det minste en av ulempene ved kjent teknikk. The purpose of the invention is to remedy or to reduce at least one of the disadvantages of known technology.
Formålet oppnås ved trekk som er angitt i nedenstående be-skrivelse og i etterfølgende patentkrav. The purpose is achieved by features which are indicated in the description below and in subsequent patent claims.
En dykket turbin i overensstemmelse med oppfinnelsen er koplet til en kraftmaskin hvor kraftmaskinen befinner seg på en bærende konstruksjon, og kjennetegnes ved at turbinen er svingbart koplet til den bærende konstruksjon. A submerged turbine in accordance with the invention is connected to a power machine where the power machine is located on a supporting structure, and is characterized by the fact that the turbine is pivotally connected to the supporting structure.
Turbinens aksling utsettes derved i hovedsak bare for strekk og dreiemoment, idet bøyemoment i hovedsak er fraværende. The turbine's shafting is thereby essentially only exposed to tension and torque, as bending moment is essentially absent.
Kraftmaskinen, som kan utgjøres for eksempel av en elektrisk generator eller en pumpe, kan være fast koplet til den bærende konstruksjon, mens turbinen er koplet til kraftmaskinen ved hjelp av minst én kopling for eksempel i form av en universalkopling eller konstanthastighetskopling. The power machine, which can be for example an electric generator or a pump, can be permanently connected to the supporting structure, while the turbine is connected to the power machine by means of at least one coupling, for example in the form of a universal coupling or constant speed coupling.
I en alternativ utførelsesform er kraftmaskinen dreibart koplet til konstruksjonen. Kraftmaskinen kan således være anbrakt i en ramme, idet kraftmaskinen er dreibart koplet til rammen om en i hovedsak horisontal første akse, mens rammen er koplet til den bærende konstruksjon ved hjelp av en andre i hovedsak horisontal akse. Den andre akse står perpendiku-lært på den første akse. Rammen med den første og den andre akse utgjør derved en universalkopling som muliggjør utsvingning av den til kraftmaskinen tilkoplede turbin i vilkårlig retning fra vertikalaksen. In an alternative embodiment, the power machine is rotatably connected to the structure. The power machine can thus be placed in a frame, as the power machine is rotatably connected to the frame about an essentially horizontal first axis, while the frame is connected to the supporting structure by means of a second essentially horizontal axis. The second axis is perpendicular to the first axis. The frame with the first and the second axis thereby constitutes a universal coupling which enables the turbine connected to the power machine to swing in any direction from the vertical axis.
Turbinen kan være sammenbygget av flere relativt korte tur-binpartier for å redusere produksjonskostnader ved fremstil-ling av skovler med tilstrekkelig styrke. Skovlene kan være skråstilt som beskrevet under kjent teknikk. The turbine can be assembled from several relatively short turbine sections to reduce production costs when producing blades with sufficient strength. The vanes can be inclined as described under known technology.
Turbinen er ved sitt nedre parti forsynt med en masse for å begrense utsvingningen fra den vertikale akse. Massen kan ut-gjøre en del av turbinen, eller den kan være anordnet for eksempel under turbinen. The lower part of the turbine is provided with a mass to limit the oscillation from the vertical axis. The mass can form part of the turbine, or it can be arranged, for example, under the turbine.
Når turbinen skal anvendes i åpent farvann, utgjøres den bærende konstruksjon normalt av en flytende, forankret konstruksjon. Nær land kan det være hensiktsmessig å utforme den bærende konstruksjon som en konstruksjon med feste i grunnen. When the turbine is to be used in open water, the supporting structure normally consists of a floating, anchored structure. Close to land, it may be appropriate to design the load-bearing structure as a structure with an attachment to the ground.
En turbin i henhold til oppfinnelsen muliggjør en vesentlig økning av turbinens størrelse utover kjent teknikk, og derved også mulig øket effektuttak. Oppfinnelsen åpner således for kommersiell utnyttelse av denne turbinart. A turbine according to the invention enables a significant increase in the turbine's size beyond known technology, and thereby also possible increased power output. The invention thus opens the way for commercial exploitation of this type of turbine.
I det etterfølgende beskrives et eksempel på en foretrukket utførelsesform som er anskueliggjort på medfølgende tegning-er , hvor: Fig. 1 viser skjematisk en turbin i overensstemmelse med In what follows, an example of a preferred embodiment is described which is visualized in the accompanying drawings, where: Fig. 1 schematically shows a turbine in accordance with
oppfinnelsen; og the invention; and
Fig. 2 viser i større målestokk en innfestningsdetalj i en Fig. 2 shows on a larger scale an attachment detail in a
alternativ utførelsesform. alternative embodiment.
På tegningene betegner henvisningstallet 1 en strømningspumpe som omfatter en flytende konstruksjon 2 med en pumpe 4 som In the drawings, the reference number 1 denotes a flow pump comprising a floating construction 2 with a pump 4 which
drives av en turbin 6. driven by a turbine 6.
Den flytende konstruksjon 2 er ved hjelp av fortøyninger 8 anbrakt i en posisjon på vannoverflaten 10. The floating structure 2 is placed in a position on the water surface 10 by means of moorings 8.
Turbinen 6 som roterer om en nær vertikal turbinakse 12, er i dette foretrukne utførelseseksempel koplet til pumpen 4 ved hjelp av en kopling 14. Koplingen 14 kan utgjøres av for eksempel en konstanthastighetskopling eller av én eller flere mindre kostbare universalledd. The turbine 6, which rotates about a nearly vertical turbine axis 12, is in this preferred embodiment connected to the pump 4 by means of a coupling 14. The coupling 14 can be made up of, for example, a constant speed coupling or of one or more less expensive universal joints.
Ved sitt nedre parti er turbinen 6 forsynt med en masse 16. At its lower part, the turbine 6 is provided with a mass 16.
Når en vannstrøm 18 strømmer mot turbinen 6 og turbinen 6 er satt i rotasjon, overføres et dreiemoment via koplingen 14 til pumpen 4. Pumpen 4 leverer væske under trykk via ikke viste ledninger. When a water stream 18 flows towards the turbine 6 and the turbine 6 is set in rotation, a torque is transferred via the coupling 14 to the pump 4. The pump 4 delivers liquid under pressure via lines not shown.
Grunnet vannatrømmens 18 kraft mot turbinen 6, idet kraften motvirkes av fortøyningskreftene, vil turbinen 6 svinge ut til en vinkel i forhold til vertikal retning: Utsvingningen begrenses av massen 16 som søker å svinge turbinen 6 tilbake til en vertikal stilling, idet den horisontale avstand mellom massens 16 tyngdepunkt og koplingen 14, multiplisert med massens vekt, utgjør et opprettende dreiemoment. Due to the force of the water current 18 against the turbine 6, as the force is counteracted by the mooring forces, the turbine 6 will swing out to an angle in relation to the vertical direction: The swing is limited by the mass 16 which seeks to swing the turbine 6 back to a vertical position, as the horizontal distance between the center of gravity of the mass 16 and the coupling 14, multiplied by the weight of the mass, constitute a creating torque.
Koplingen 14 opptar de nevnte utsving uten at det overføres bøyemoment av betydning til pumpen 4. The coupling 14 accommodates the aforementioned oscillations without any significant bending moment being transferred to the pump 4.
I en alternativ utførelsesform, se fig. 2, er pumpen 4 dreibart opphengt om en første horisontal akse 20 i en ramme 22. Rammen 22 er dreibart om en andre horisontal akse 24 opphengt i den flytende konstruksjon 2. Den andre akse 24 står perpen-dikulært på den første akse 20, hvorved rammen 22 utgjør en universalkopling mellom pumpen 4 og den flytende konstruksjon 2. In an alternative embodiment, see fig. 2, the pump 4 is rotatably suspended about a first horizontal axis 20 in a frame 22. The frame 22 is rotatable about a second horizontal axis 24 suspended in the floating structure 2. The second axis 24 is perpendicular to the first axis 20, whereby the frame 22 forms a universal connection between the pump 4 and the floating structure 2.
Pumpen 4 kan derved følge turbinens 6 utsvingning uten å overføre bøymoment til den flytende konstruksjon 2. Dreiemoment fra turbinen 6 overføres selvfølgelig på normal måte. The pump 4 can thereby follow the oscillation of the turbine 6 without transferring bending moment to the floating structure 2. Torque from the turbine 6 is of course transferred in the normal way.
Claims (8)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20070197A NO325833B1 (en) | 2007-01-11 | 2007-01-11 | Darrieus turbine |
| PCT/NO2007/000459 WO2008085056A1 (en) | 2007-01-11 | 2007-12-21 | Submerged darrieus turbine pivotally connected to the support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20070197A NO325833B1 (en) | 2007-01-11 | 2007-01-11 | Darrieus turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO20070197L NO20070197L (en) | 2008-07-14 |
| NO325833B1 true NO325833B1 (en) | 2008-07-28 |
Family
ID=39608858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20070197A NO325833B1 (en) | 2007-01-11 | 2007-01-11 | Darrieus turbine |
Country Status (2)
| Country | Link |
|---|---|
| NO (1) | NO325833B1 (en) |
| WO (1) | WO2008085056A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20101213A1 (en) * | 2010-09-01 | 2012-02-06 | Erling Magnar Haug | Underwater production unit for electricity |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2960266A1 (en) * | 2010-05-19 | 2011-11-25 | Centre Nat Rech Scient | Vertical-axis marine turbine for generating electricity, has flexible bearing structure bearing vertical-axis turbine units and comprising cable including strands interlaced with each other to resist torsional stress |
| WO2012165444A1 (en) * | 2011-06-01 | 2012-12-06 | 合同会社アルバトロス・テクノロジー | Natural energy extraction apparatus |
| CN103649525B (en) | 2011-07-05 | 2016-05-04 | 合同会社信天翁科技 | Natural energy withdrawing device |
| US11661921B2 (en) * | 2020-10-20 | 2023-05-30 | Forcegenie, Llc | Wind, wave, and water power generation system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281965A (en) * | 1979-05-07 | 1981-08-04 | Stjernholm Dale T | Cantilever mounted wind turbine |
| JPS5872677A (en) * | 1981-10-27 | 1983-04-30 | Nippon Electric Ind Co Ltd | Electric generator with float system dalius type hydraulic turbine |
| JPS6355370A (en) * | 1986-08-22 | 1988-03-09 | Akaho Yoshio | Tidal power generating device using daryavaus type turbine |
| US5324169A (en) * | 1993-04-09 | 1994-06-28 | Brown George L | Oscillating, lateral thrust power generator |
| US6884020B2 (en) * | 1999-01-06 | 2005-04-26 | Water Power Industries As | Turbine driven with a fluid medium |
| OA11816A (en) * | 1999-01-06 | 2005-08-16 | Water Power Ind As | Turbine driven with a fluid medium. |
| US6856036B2 (en) * | 2001-06-26 | 2005-02-15 | Sidney Irving Belinsky | Installation for harvesting ocean currents (IHOC) |
| GB0120273D0 (en) * | 2001-08-21 | 2001-10-10 | Imp College Innovations Ltd | Floating verticle-axis turbine |
-
2007
- 2007-01-11 NO NO20070197A patent/NO325833B1/en not_active IP Right Cessation
- 2007-12-21 WO PCT/NO2007/000459 patent/WO2008085056A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO20101213A1 (en) * | 2010-09-01 | 2012-02-06 | Erling Magnar Haug | Underwater production unit for electricity |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008085056A1 (en) | 2008-07-17 |
| NO20070197L (en) | 2008-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101910622B (en) | Turbine arrangement | |
| JP5818743B2 (en) | Natural energy extractor | |
| US7612462B2 (en) | Floating wind turbine system | |
| JP2012525535A (en) | Underwater generator | |
| JPS58500531A (en) | Comprehensive wind and wave utilization equipment | |
| EA016975B1 (en) | Turbine engine with transverse-flow hydraulic turbines having reduced total lift force | |
| NO323274B1 (en) | Extraction of power from moving water | |
| NO326339B1 (en) | Liquid plants for the production of energy from water drums | |
| CN101395367A (en) | Hydroelectric equipment and system capable of producing renewable energy | |
| US10309368B2 (en) | Power generation apparatus utilizing water current energy | |
| NO325833B1 (en) | Darrieus turbine | |
| GB2431207A (en) | Flow alignment device for tidal generating apparatus | |
| CA2547748A1 (en) | Darrieus waterwheel turbine | |
| CN101326361A (en) | Tidal flow energy conversion system | |
| US10151294B2 (en) | Buoyant housing device enabling large-scale power extraction from fluid current | |
| US8310078B2 (en) | Apparatus for receiving and transferring kinetic energy from water flow | |
| CN102165183A (en) | Improvements in ocean wave energy extraction | |
| US9624907B2 (en) | Velocity gradient floating turbine and power generation system and methods thereof | |
| CN101871418B (en) | Water turbine blade type power generation device | |
| NO320286B1 (en) | Turbine for power generation | |
| EP2425123A2 (en) | A water powered electrical generator | |
| JP2009543982A (en) | Wind power generator | |
| NO320852B1 (en) | Device with a rigid support column for anchoring an axial turbine for producing electric energy from water drums | |
| CN103649525B (en) | Natural energy withdrawing device | |
| WO2011107799A2 (en) | Improved tidal stream turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM1K | Lapsed by not paying the annual fees |