CN106545453A - Tidal current energy water turbine runner and its hydraulic turbine - Google Patents
Tidal current energy water turbine runner and its hydraulic turbine Download PDFInfo
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- CN106545453A CN106545453A CN201510609787.6A CN201510609787A CN106545453A CN 106545453 A CN106545453 A CN 106545453A CN 201510609787 A CN201510609787 A CN 201510609787A CN 106545453 A CN106545453 A CN 106545453A
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- 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
Abstract
The invention discloses a kind of tidal current energy water turbine runner and its hydraulic turbine, particularly a kind of blade profile is hyperbolic type aerofoil profile tidal current energy water turbine runner and its hydraulic turbine, belongs to fluid machinery technical field of power generation;The tidal current energy water turbine runner bucket is non-fully centrosymmetric hyperbolic type structure design, so that just always flowing with reversely effectively to work during flowing, the asymmetrical design of this vane airfoil profile also ensures that unit preferably can adapt to reversely flow simultaneously, keep aerofoil profile to be in all the time suitably to flow angle, can effectively improve energy utilization efficiency.
Description
Technical field
The present invention relates to a kind of tidal current energy water turbine, especially a kind of tidal current energy water turbine with Hyperbolic Blade, belongs to fluid machinery technical field of power generation.
Background technology
Two Mainstays in China's utilization of energy structure:One is the thermal power generation based on fire coal, and two is big-and-middle-sized hydroelectric generation.And not only less efficient but also shared in the energy resource structure ratio very little of the utilization of new forms of energy.With developing rapidly for social economy, some contradictions of China's utilization of energy start to highlight, and such as energy insufficient total amount, energy resource structure are simple, and energy distribution extreme imbalance geographically etc..Copenhagen meeting, proposes tightened up requirement to the energy-consuming of China, it is necessary to reduce the consumption of fossil energy.Conscientiously fulfil the solemn commitment that we make to tackle global warming, active development and utilize various regenerative resources, progressively improve China's energy resource structure and the energy Regional Distribution, promote national economic development it is significant.
The regenerative resource that China has utilized mainly has water energy, wind energy, solar energy, geothermal energy and biomass energy etc..Wherein the exploitation of water energy is in most ripe position, especially the huge power station such as the Yangtze River Gorges, Long Tan, Xi Luodu, Burner zone successively build up generating, by 2013, China's total installed capacity of hydropower reaches 2.8 hundred million kilowatts, Chinese capacity of installed generator reaches 12.47 hundred million kilowatts, total installed capacity of hydropower reaches the 22.5% of total installation of generating capacity, alleviates significantly the tense situation of China's utilization of energy.But the hydroelectric resources of China's extreme portions is distributed in less-developed west area, and in economically developed eastern region and southeastern coast, potential hydroenergy is little.And, conventional waterpower development can bring large-scale civil engineering, flood a large amount of farmlands, cause the synthtic price index such as a large amount of immigrants, destruction ecological environment, comprehensive utilization it is relatively costly.The developed area such as southeastern coast is main energy resource consumption ground again simultaneously.Therefore, how to make full use of the ocean resources superiority that the southeastern coastal areas are abundant, the lower-cost regenerative resource of Development & Multipurpose use is important topic that China's engineering technological faces.So《Long-term scientific and technical development program outline 2006-2020 in country》, plan THE EXPLOITATION OF OCEAN ENERGY as Major Strategic.
According to the statistics to 130 water channels, the theoretical mean power of the coastal trend resource in the whole nation is 13948.52 ten thousand kW.It is most wherein with Zhejiang Province, there are 37 water channels, theoretical mean power is 70,900,000 kW, accounts for more than 1/2nd of the whole nation.The factors such as the environmental condition according to coastal energy resource density, theory potentiality and exploitation, all water channel energy resource densities of Zhoushan sea area are high, DEVELOPMENT PROSPECT is best, such as Jintang Channel(25.9kW/m2), Guishan Mountain water channel(23.9kW/m2), Xi Houmen water channels(19.1 kW/m2)Deng.
In the face of increasingly serious energy crisis, the research and building-up work of marine tidal-current energy generating has all been carried out in countries in the world.Therefore the trend hydrogenerator for being adapted to marine tidal-current energy feature is developed, for exploitation marine resources improve the energy total amount of China, the energy resource structure for enriching China is all of great advantage.
The water flow dynamic energy that marine tidal-current energy water turbine will can be caused by the natural lifting of ocean or the river water surface, or form the sea water flowing kinetic energy caused by sea water flowing and be converted into electric energy because solar energy is input into uneven.Therefore, tidal generation water turbine is used as a kind of device of utilization marine resources, with important research and development meaning.However, as the history for developing is very short, tidal power generating not yet has the technology of large-scale development at the aspect such as basic research and industry park plan especially in the research of energy conversion device in the world.
The content of the invention
The present invention goal of the invention be:For above-mentioned problem, there is provided a kind of tidal current energy water turbine, have the advantages that simple for structure, energy utilization efficiency is high, additionally it is possible to the conversion of energy efficient is carried out using the trend of two-way flow.
The technical solution used in the present invention is as follows:
Tidal current energy water turbine runner, runner bucket section are the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is(0.3~0.35)D, leading-edge radius of airfoil r1For(0.004~0.005)D, airfoil trailing edge radius rtFor(0.004~0.005)D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For(0.2~0.3)D, leaf basin molded line radius R12For(0.25~0.35)D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For(0.2~0.3)D, leaf basin molded line radius Rt2For(0.25~0.35)D, the first airfoil laying angle Beta of blade1For 68 °~71 °, the second airfoil laying angle Beta2For 70 °~74 °.
Further, the blade profile aerofoil profile is radially increased with extended corner θ from runner boss.
Further, the extended corner θ is 9.5 °~10.5 °.
Further, 9 blades are provided with the runner.
Further, aerofoil profile chord length C of second airfoil1For(0.15~0.175)D.
Further, the wheel hub of the runner is spindle-type structure, wheel hub flowing side length L1For(2/3~3/4)D, wheel hub go out to flow side length L2For(1/2~2/3)D.
Further, the wheel hub end diameter d1For(0.03~0.04)D.
Further, the hub outside diameter is d2For(0.28~0.30)D.
A kind of tidal current energy water turbine of the present invention, comprising above-mentioned runner, the runner is arranged in runner room, also including collapsible tube and anemostat, the miner diameter end of the miner diameter end and anemostat of the collapsible tube is linked as entirety by runner envelope, forms the housing of the big middle part brief summary structure in two ends.
Further, the bigger diameter end internal diameter D of the collapsible tube1For(2.2~2.3)D, the bigger diameter end internal diameter D of the anemostat2For(2.2~2.3)D.
Further, length L of the collapsible tube bigger diameter end to runner bucket4For(1.5~1.6)D, length L of the anemostat bigger diameter end to runner bucket3For(1.8~1.9)D.
In sum, as a result of above-mentioned technical proposal, the invention has the beneficial effects as follows:
1st, tidal current energy water turbine runner of the invention is on the basis of blade hyperbolic type Airfoil Design, just always stream and effectively can work during reversely flowing, simultaneously in the specific design of vane airfoil profile, first airfoil and the second aerofoil profile not exclusively cause two airfoils to have different laying angles with regard to centrosymmetry, runner is enabled preferably to adapt to reversely flow, keep aerofoil profile to be in all the time suitably to flow angle, can effectively improve the utilization ratio of energy;
2nd, in addition, vane airfoil profile chord length C on runner gradually increases from wheel hub to wheel rim, runner is conducive to realize higher work efficiency;
3rd, in tidal current energy water turbine of the invention, the collapsible tube of hydraulic turbine housing, runner envelope and anemostat design forming similar to hourglass shape structure, import and export fluid available energy can be increased so that just always stream is respectively provided with higher capacity usage ratio with reversely during flowing.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the vane airfoil profile schematic diagram of tidal current energy water turbine runner of the present invention;
Fig. 2 is the structural representation of tidal current energy water turbine of the present invention;
Fig. 3 is tidal current energy water turbine Fig. 2 runner shafts of the present invention to right view.
Labelling in figure:1- blades, 2- wheel hubs, 3- collapsible tubes, 4- runners envelope, 5- anemostats, D- runner diameters, C- aerofoil profile chord lengths, C1The aerofoil profile chord length of the-the second airfoil, r1- leading-edge radius of airfoil, rt- airfoil trailing edge radius, R11The blade back molded line radius of the-the first airfoil, R12The leaf basin molded line radius of the-the first airfoil, Rt1The blade back molded line radius of the-the second airfoil, Rt2The leaf basin molded line radius of the-the second airfoil, Beta1- the first airfoil laying angle, Beta2- the second airfoil laying angle, θ-extended corner, L1- wheel hub flowing side length, L2- wheel hub goes out to flow side length, d1- wheel hub end diameter, d2- hub outside diameter, D1The bigger diameter end internal diameter of-collapsible tube, D2The bigger diameter end internal diameter of-anemostat, L3The length of-anemostat bigger diameter end to runner bucket, L4The length of-collapsible tube bigger diameter end to runner bucket.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, in addition to mutually exclusive feature and/or step, can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be replaced by other equivalent or alternative features with similar purpose.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics.
The tidal current energy water turbine runner of the present invention, 1 section of runner bucket are the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and its structure is as shown in figure 1, at runner diameter D, vane airfoil profile chord length C is(0.3~0.35)D, leading-edge radius of airfoil r1For(0.004~0.005)D, airfoil trailing edge radius rtFor(0.004~0.005)D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For(0.2~0.3)D, leaf basin molded line radius R12For(0.25~0.35)D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For(0.2~0.3)D, leaf basin molded line radius Rt2For(0.25~0.35)D, the first airfoil laying angle Beta of blade1For 68 °~71 °, the second airfoil laying angle Beta2For 70 °~74 °.R in the present invention1、R11、Rt2、rt、Rt1、R12Corresponding tangential, in hyperbolic type airfoil structure of the invention Leaf aerofoil profile in Non-completety symmetry, runner can effectively can work in just always flowing and reversely carrying out stream process, there are two different laying angles in the first airfoil and the second airfoil simultaneously, preferably can adapt to reversely flow, keep aerofoil profile to be in all the time suitably to flow angle, can effectively improve the utilization ratio of energy.
In addition, 1 section aerofoil profile of the blade is radially increased with extended corner θ from runner boss.Further extended corner θ is 9.5 °~10.5 °, as shown in figure 3, being conducive to runner to realize higher work efficiency.
9 blades 1 are provided with the runner.
As shown in figure 1, aerofoil profile chord length C of second airfoil1For(0.15~0.175)D.
As shown in Fig. 2 the wheel hub 2 of the runner is spindle-type structure, wheel hub 2 flowing side length L1For(2/3~3/4)D, wheel hub 2 go out to flow side length L2For(1/2~2/3)D, wheel hub end diameter d1For(0.03~0.04)D.The hub outside diameter d2For(0.28~0.30)D.Be beneficial to and preferably flow field provided for runner, to improve running efficiency.
A kind of tidal current energy water turbine of the present invention, its structure is as shown in Fig. 2 include above-mentioned runner, the runner is arranged in runner envelope 4, also including collapsible tube 3 and anemostat 5, collapsible tube 3 and anemostat 5 are in horn-like(Or it is tapered)Structure, the miner diameter end of the miner diameter end and anemostat 5 of the collapsible tube 3 is linked as entirety by runner envelope 4, form the housing of the big middle part brief summary structure in two ends, similar to common hourglass configuration, the advantage of so design is to increase import and export fluid available energy so that just always stream is respectively provided with higher capacity usage ratio with reversely during flowing.
In the present invention, the bigger diameter end internal diameter D of the collapsible tube1For(2.2~2.3)D, the bigger diameter end internal diameter D of the anemostat2For(2.2~2.3)D.Length L of the collapsible tube bigger diameter end to runner bucket4For(1.5~1.6)D, length L of the anemostat bigger diameter end to runner bucket3For(1.8~1.9)D.
Embodiment
1
In the present embodiment, the diameter D of runner is 1483mm.Runner bucket section is the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is 0.3D, leading-edge radius of airfoil r1For 0.004D, airfoil trailing edge radius rtFor 0.004D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For 0.2D, leaf basin molded line radius R12For 0.25D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For 0.2D, leaf basin molded line radius Rt2For 0.25D, the first airfoil laying angle Beta of blade1For 68 °, the second airfoil laying angle Beta2For 70 °.Aerofoil profile chord length C of the second airfoil1For 0.15D.
9 blades 1 are provided with runner, 1 section aerofoil profile of the blade is radially increased with extended corner θ from runner boss, and extended corner θ is 9.5 °.
In the present embodiment, wheel hub is spindle-type structure, wheel hub flowing side length L1For 2/3D, wheel hub goes out to flow side length L2For 1/2D, wheel hub end diameter d1For 0.03D, hub outside diameter d2For 0.28D.
The runner of the present embodiment is installed in housing, housing includes collapsible tube 3, runner envelope 4 and anemostat 5, the miner diameter end of the miner diameter end and anemostat 5 of the collapsible tube 3 is linked as the big middle part brief summary structure in two ends, the bigger diameter end internal diameter D of the collapsible tube is integrally formed by runner envelope 41For 2.2D, the bigger diameter end internal diameter D of the anemostat2For 2.2D.The runner is located in runner envelope 4, and its outer rim is coordinated with 4 inner ring surface gap of runner envelope, length L of the collapsible tube bigger diameter end to runner bucket4For 1.5D, length L of the anemostat bigger diameter end to runner bucket3For 1.8D.
The present embodiment unit, current are two-way flowing, 8.9 m of positive flow3/ s, power 13.1kw, 8.5 m of reverse flow3/ s, power 12.0kw.
Embodiment
2
In the present embodiment, the diameter D of runner is 1483mm.Runner bucket section is the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is 0.35D, leading-edge radius of airfoil r1For 0.005D, airfoil trailing edge radius rtFor 0.005D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For 0.3D, leaf basin molded line radius R12For 0.35D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For 0.3D, leaf basin molded line radius Rt2For 0.35D, the first airfoil laying angle Beta of blade1For 71 °, the second airfoil laying angle Beta2For 74 °.Aerofoil profile chord length C of the second airfoil1For 0.175D.
9 blades 1 are provided with runner, 1 section aerofoil profile of the blade is radially increased with extended corner θ from runner boss, and extended corner θ is 10.5 °.
In the present embodiment, wheel hub is spindle-type structure, wheel hub flowing side length L1For 3/4D, wheel hub goes out to flow side length L2For 2/3D, wheel hub end diameter d1For 0.04D, hub outside diameter d2For 0.3D.
The runner of the present embodiment is installed in housing, housing includes collapsible tube 3, runner envelope 4 and anemostat 5, the miner diameter end of the miner diameter end and anemostat 5 of the collapsible tube 3 is linked as the big middle part brief summary structure in two ends, the bigger diameter end internal diameter D of the collapsible tube is integrally formed by runner envelope 41For 2.3D, the bigger diameter end internal diameter D of the anemostat2For 2.3D.The runner is located in runner envelope 4, and its outer rim is coordinated with 4 inner ring surface gap of runner envelope, length L of the collapsible tube bigger diameter end to runner bucket4For 1.6D, length L of the anemostat bigger diameter end to runner bucket3For 1.9D.
The present embodiment unit, current are two-way flowing, positive flow 9.2m3/ s, power 13.2kw, 8.6 m of reverse flow3/ s, power 12.2kw.
Embodiment
3
In the present embodiment, the diameter D of runner is 1483mm.Runner bucket section is the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is 0.325D, leading-edge radius of airfoil r1For 0.0045D, airfoil trailing edge radius rtFor 0.0045D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For 0.25D, leaf basin molded line radius R12For 0.30D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For 0.25D, leaf basin molded line radius Rt2For 0.30D, the first airfoil laying angle Beta of blade1For 70 °, the second airfoil laying angle Beta2For 72 °.Aerofoil profile chord length C of the second airfoil1For 0.16D.
9 blades 1 are provided with runner, 1 section aerofoil profile of the blade is radially increased with extended corner θ from runner boss, and extended corner θ is 10.0 °.
In the present embodiment, wheel hub is spindle-type structure, wheel hub flowing side length L1For 17/24D, wheel hub goes out to flow side length L2For 7/12D, wheel hub end diameter d1For 0.035D, hub outside diameter d2For 0.29D.
The runner of the present embodiment is installed in housing, housing includes collapsible tube 3, runner envelope 4 and anemostat 5, the miner diameter end of the miner diameter end and anemostat 5 of the collapsible tube 3 is linked as the big middle part brief summary structure in two ends, the bigger diameter end internal diameter D of the collapsible tube is integrally formed by runner envelope 41For 2.25D, the bigger diameter end internal diameter D of the anemostat2For 2.25D.The runner is located in runner envelope 4, and its outer rim is coordinated with 4 inner ring surface gap of runner envelope, length L of the collapsible tube bigger diameter end to runner bucket4For 1.55D, length L of the anemostat bigger diameter end to runner bucket3For 1.85D.
The present embodiment unit, current are two-way flowing, positive flow 9.0m3/ s, power 13.0kw, 8.5 m of reverse flow3/ s, power 12.1kw.
Embodiment
4
In the present embodiment, the diameter D of runner is 1500mm.Runner bucket section is the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is 0.3D, leading-edge radius of airfoil r1For 0.004D, airfoil trailing edge radius rtFor 0.004D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For 0.2D, leaf basin molded line radius R12For 0.25D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For 0.2D, leaf basin molded line radius Rt2For 0.25D, the first airfoil laying angle Beta of blade1For 68 °, the second airfoil laying angle Beta2For 70 °.Aerofoil profile chord length C of the second airfoil1For 0.15D.
9 blades 1 are provided with runner, 1 section aerofoil profile of the blade is radially increased with extended corner θ from runner boss, and extended corner θ is 9.5 °.
In the present embodiment, wheel hub is spindle-type structure, wheel hub flowing side length L1For 2/3D, wheel hub goes out to flow side length L2For 1/2D, wheel hub end diameter d1For 0.03D, hub outside diameter d2For 0.28D.
The runner of the present embodiment is installed in housing, housing includes collapsible tube 3, runner envelope 4 and anemostat 5, the miner diameter end of the miner diameter end and anemostat 5 of the collapsible tube 3 is linked as the big middle part brief summary structure in two ends, the bigger diameter end internal diameter D of the collapsible tube is integrally formed by runner envelope 41For 2.2D, the bigger diameter end internal diameter D of the anemostat2For 2.2D.The runner is located in runner envelope 4, and its outer rim is coordinated with runner envelope inner ring surface gap, length L of the collapsible tube bigger diameter end to runner bucket4For 1.5D, length L of the anemostat bigger diameter end to runner bucket3For 1.8D.
The present embodiment unit, current are two-way flowing, positive flow 9.5m3/ s, power 13.5kw, 8.8 m of reverse flow3/ s, power 12.6kw.
The tidal current energy water turbine runner of the present invention is on the basis of blade hyperbolic type Airfoil Design, just always stream and effectively can work during reversely flowing, simultaneously in the design of vane airfoil profile, first airfoil and the second aerofoil profile are not exclusively with regard to centrosymmetry, make it possible to preferably adapt to reversely flow, keep aerofoil profile to be in all the time suitably to flow angle, can effectively improve the utilization ratio of energy;Vane airfoil profile chord length C on runner gradually increases from wheel hub to wheel rim, is advantageously implemented higher work efficiency;The collapsible tube of the tidal current energy water turbine housing, runner envelope and anemostat design forming similar to hourglass shape structure, import and export fluid available energy can be increased so that just always stream and reversely higher capacity usage ratio is respectively provided with during flowing.
The invention is not limited in aforesaid specific embodiment.The present invention expands to any new feature for disclosing in this manual or any new combination, and the step of the arbitrary new method that discloses or process or any new combination.
Claims (10)
1. tidal current energy water turbine runner, it is characterised in that:Runner bucket section is the hyperbolic type aerofoil profile of the first airfoil and the second airfoil composition, and at runner diameter D, vane airfoil profile chord length C is(0.3~0.35)D, leading-edge radius of airfoil r1For(0.004~0.005)D, airfoil trailing edge radius rtFor(0.004~0.005)D, the blade back molded line radius R of the first airfoil that aerofoil profile leading edge is located11For(0.2~0.3)D, leaf basin molded line radius R12For(0.25~0.35)D, the blade back molded line radius R of the second airfoil that airfoil trailing edge is locatedt1For(0.2~0.3)D, leaf basin molded line radius Rt2For(0.25~0.35)D, the first airfoil laying angle Beta of blade1For 68 °~71 °, the second airfoil laying angle Beta2For 70 °~74 °.
2. tidal current energy water turbine runner as claimed in claim 1, it is characterised in that:The blade profile aerofoil profile is radially increased with extended corner θ from runner boss.
3. tidal current energy water turbine runner as claimed in claim 2, it is characterised in that:The extended corner θ is 9.5 °~10.5 °.
4. tidal current energy water turbine runner as claimed in claim 1, it is characterised in that:9 blades are provided with the runner.
5. tidal current energy water turbine runner as claimed in claim 1, it is characterised in that:Aerofoil profile chord length C of second airfoil1For(0.15~0.175)D.
6. tidal current energy water turbine runner as claimed in claim 1, it is characterised in that:The wheel hub of the runner is spindle-type structure, wheel hub flowing side length L1For(2/3~3/4)D, wheel hub go out to flow side length L2For(1/2~2/3)D.
7. tidal current energy water turbine runner as claimed in claim 6, it is characterised in that:The hub outside diameter is d2For(0.28~0.30)D.
8. a kind of tidal current energy water turbine, it is characterised in that:Comprising the runner as described in any one of claim 1 to 7, the runner is arranged in runner room, and also including collapsible tube and anemostat, the miner diameter end of the miner diameter end and anemostat of the collapsible tube is linked as entirety by runner envelope, forms the housing of the big middle part brief summary structure in two ends.
9. tidal current energy water turbine as claimed in claim 8, it is characterised in that:The bigger diameter end internal diameter D of the collapsible tube1For(2.2~2.3)D, the bigger diameter end internal diameter D of the anemostat2For(2.2~2.3)D.
10. tidal current energy water turbine as claimed in claim 8, it is characterised in that:Length L of the collapsible tube bigger diameter end to runner bucket4For(1.5~1.6)D, length L of the anemostat bigger diameter end to runner bucket3For(1.8~1.9)D.
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