CN105161190A - High strength windable electromechanical tether with low fluid dynamic drag and system using same - Google Patents
High strength windable electromechanical tether with low fluid dynamic drag and system using same Download PDFInfo
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- CN105161190A CN105161190A CN201510600649.1A CN201510600649A CN105161190A CN 105161190 A CN105161190 A CN 105161190A CN 201510600649 A CN201510600649 A CN 201510600649A CN 105161190 A CN105161190 A CN 105161190A
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G11/00—Arrangements of electric cables or lines between relatively-movable parts
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
- D07B1/147—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising electric conductors or elements for information transfer
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
-
- 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
- F03D5/00—Other wind motors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
- H01B7/043—Flexible cables, conductors, or cords, e.g. trailing cables attached to flying objects, e.g. aircraft towline, cables connecting an aerodyne to the ground
-
- 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
- F05B2240/92—Mounting on supporting structures or systems on an airbourne structure
- F05B2240/921—Mounting on supporting structures or systems on an airbourne structure kept aloft due to aerodynamic effects
-
- 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
Abstract
A tether, and system using such a tether, adapted to provide mechanical and electrical coupling of an airborne flying platform to the ground. The tether may have a center structural core with electrical conductors on or near the outer diameter of the tether. The tether may utilize exterior configurations adapted to reduce drag.
Description
The divisional application that the application is the applying date is on July 19th, 2011, application number is the application for a patent for invention " a kind of high strength with low hydrodynamic drag can up-coiler electric system chain and use the system of this tethers " of 201180045064.8.
The cross reference of related application
This application claims the priority of the U.S. Provisional Patent Application the 61/365th, 655 that the people such as VanderLind submitted on July 19th, 2010.This application claims the U.S. Provisional Patent Application the 61/409th that VanderLind submitted on November 3rd, 2010, the priority of 894.
Technical field
The application relates to high strength lower resistance tethers and uses the system of this tethers.
Background technology
The aerostat that the tidal energy system (tetheredtidalpowersystem) that some airborne wind energy systems, power kite, tethers hitch, parking platform, tethers hitch and the matching requirements height tethers intensity that other tethers hitches, effective tethers power transmission, and convection cell dynamic drag effect is responsive.
In some airborne electricity generation system situations, the aerial work platform of such as wing can support a collection of turbogenerator.Utilization provides the physical connection on platform and the ground hitched by tethers and platform is connected to ground by the tethers electrically connected.In this case, the electric power produced by turbogenerator can be passed to ground along tethers from aerial platform.When turbogenerator is also used as motor driven screw, such as, when platform can be used to from during raked floor, tethers can provide electric power for aerial platform.And tethers can for being used as the passage of the telemetry relevant to the controlling functions on platform.
In addition, tethers provides platform to the mechanical connection on ground.In cross wind flying situation, such as, when the mode flight that apparent wind during aerial platform is with platform is more much higher than nominal actual wind speed, pulling of tethers can play the part of important role in whole system function.Typically, tethers be wound on some types spool on as the storage of the power capstan part of aerial platform.
What be mentioned is tethers, and uses the system of tethers, and it supports from the high strength on ground for aerial platform provides.What be also mentioned is the very low tethers supported to make it be suitable for airborne platform on resistance.
Summary of the invention
A kind of tethers, and use the system of this tethers, it is suitable for providing the machinery on onboard flight platform and ground and electrically connects.Tethers can have division center core, and this structural core to have on tethers external diameter or close to the electric conductor of outer radius.This tethers can adopt the external structure being suitable for reducing resistance.
Accompanying drawing explanation
Fig. 1 is the diagram of the embodiment that the dynamo-electric tethers of high-tensile is described;
Fig. 2 illustrates to have the diagram that bundle closes the embodiment of the dynamo-electric tethers of electric conductor, and it is helicla flute space for the creativity.
Fig. 3 illustrates the diagram comprising the embodiment of the dynamo-electric tethers of the secondary stress elimination of conductor element at tethers.
Fig. 4 illustrates to comprise two conductor elements and a diagram as the embodiment of the particular example of the dynamo-electric tethers of the chuck of low bulk modulus material.
Fig. 5 is the diagram that the embodiment comprising the strength member of alternative transverse sectional structure and the dynamo-electric tethers of electric conductor is described.
Fig. 6 is the chart of tethers performance according to some embodiments of the invention.
Fig. 7 is the viewgraph of cross-section of tethers according to some embodiments of the invention.
Fig. 8 describes several external structures according to some embodiments of the invention.
Embodiment
The detailed description of the one or more embodiment of the present invention is attached the accompanying drawing describing the principle of the invention and is provided hereinafter together.The present invention is described in conjunction with these embodiments, but the present invention is not subject to the restriction of any embodiment.Scope of the present invention is only subject to the restriction of claims, and the scope of the invention comprise various substitute, amendment and equivalent.Various detail is suggested thus provides thorough understanding of the present invention in following explanation.These details are provided for example object and the present invention can be implemented according to claims without some or all ground in these details.Object for the sake of simplicity, technologic material known in technical field related to the present invention is not described in detail, to make the present invention can not be non-essential obscure.
In some embodiments of the invention, the dynamo-electric tethers of high strength lower resistance is suitable for using in various applications, such as, airborne generation platform is attached to ground.In certain embodiments, the high strength core that the independent composite rod that tethers comprises changing the coaxial layer winding of helical angle manufactures, around the coaxial mounted low bulk modulus material of high strength core and around low bulk modulus helical layer winding or coaxial mounted independent or coaxial insulated electric conductor.Electric conductor can bear heat during conduction, and on tethers external diameter or electric conductor may be improved in some respects near the layout of electric conductor of tethers external diameter and cool and the temperature reducing high strength core.
In certain embodiments, the screw winding of core high tensile allows the relative sliding between adjacent strands, and because this reducing the minimum winding radius of tethers about rope sheave, cylinder or pulley, this is desired performance for tethers stores.Pantostrat in high strength core can reel with opposed helical thus reduce or eliminate the moment of torsion around tethers produced by the pulling force along tethers.Electric conductor is easy to the impact suffering excessive strain and inefficacy, because they can have lower intensity than high strength core.Various design consideration can show this worry.Electric conductor can with the spirally winding of steep a little angle, to make helical form can expand as spring, to replace the strain making electric conductor self occur.And the low bulk modulus material between electric conductor and high strength core, for eliminating the strain of wire rod, allows some compression of the screw diameter of electric conductor and electric current to narrow when tethers tension.Between electric conductor and high strength core, the use of low bulk modulus material allows minimum wire rod helical angle and therefore minimizes the drift of wire rod, reduces weight heat exhaustion.
The external position of wire rod increases for reducing the temperature caused due to resistance loss in wire rod in addition, and crucial Reynolds numerical value when permission is convenient to the placement of helical groove thus reduces the reduction of tethers resistance coefficient in tethers surface.In certain embodiments, the electric conductor spaced radial along tethers outer dia allows enhancing cool and reduce resistance via identical design feature.
According to some embodiments of the present invention, the tidal energy system (tetheredtidalpowersystem) hitched at airborne wind energy system, tethers, power kite, parking platform or need for the dynamo-electric tethers of necessary use can be designed to comprise the element of hydrodynamic drag on passive reduction tethers in other application of high strength, long-life and low hydrodynamic drag, and include the element reducing and strain in conducting element.On the cylinder that the tethers used in such applications requires to be wound on minor diameter in addition or be wound on the sheave of minor diameter.This requirement is realized by the screw winding of stock in tethers, and make the average diameter of every personal share close to the average diameter of the tethers central shaft in bending, make each stock-traders' know-how go through compression alternately and tensile load, this load is balanced by the slip between adjacent strands.Then, pantostrat may can synthesize moment of torsion to balance around tethers axis under stress state with relative direction winding.Because many high-strength materials extend 1% of its drift when surrendering or rupture, and many good electrical conductor are extended when surrendering or rupture and are less than 0.4%, so the conducting element of effective in fact dynamo-electric tethers can be configured to tie down mobile system at use tethers, and during being wrapped in cylinder, stand little strain more remarkable in high strength components.By with sharply or principle tethers axial screw angle winding, can eliminate conducting element strain.Comprise low bulk modulus layer by the somewhere in the winding radius of conducting element and additionally can eliminate conducting element strain, low bulk modulus layer is compressed under conducting element pulling force, allow some inside moving radially of conducting element, and therefore reduce the required drift of conducting element.In order to reduce the impact of tethers diameter convection cell dynamic drag, can interlock to the outer surface of tethers or have groove thus reduce Reynolds number, at this Reynolds number, the cylindrical shape of tethers has the resistance coefficient of reduction.In certain embodiments, the low groove of resistance drop can be arranged between adjacent electric conductor in the mode causing the minimum increase of tethers diameter.In certain embodiments, can allow to reduce insulation amount required between adjacent electric conductor in the electric conductor group of similar voltage levels operation.
In some embodiments of the invention, the dynamo-electric tethers 101 of lower resistance light weight comprises high strength core 102, low bulk modulus material 103, insulating material 104, electric conductor 105 and sheath 106.In various embodiments, multiple compound bar that the spiral angle layer that high strength core 102 comprises changing and replacing is wound around or extrusion element.The compound bar of high strength core 102 comprises fibre element, such as Fypro, carbon fiber or glass fibre; And bound base body member, such as epoxy resin-base or vinyl esters matrix.The outer field screw winding of high strength core 102 allows the whole tethers 101 when operating to be winding in some way on cylinder, and this kind of mode reduces limited slip between adjacent rod or shearing.In the various embodiments of high strength core 102, the continuous coaxial layers of compound bar reels with opposed helical direction thus partially or completely balances the moment of torsion produced under tension by tethers, or reels with same-handed direction.In various embodiments, except compound bar, high strength core 102 is made up of dry fiber, wire or metallic cable.In various embodiments, the central core 107 of high strength core 102 is by axial composite-rotor rod, still provide the low modulus of elasticity materials of tensile strength, low load packing material, communication line, or other when filler material composition any.In various embodiments, high strength core 102 by circular, square or trapezoidal cross-section is excellent forms, or is made up of the rod of other appropriate cross-sectional shape any, or is made up of the rod of varying cross-section shape.In certain embodiments, discrete component is coated with the coating being suitable for being convenient to slide between element.This coating can be polytetrafluorethylecoatings coatings, PEEK coating, or other suitable low-friction coating any.In certain embodiments, described layer can apply by the coating being suitable for being convenient to slide between layer or layer.Such as when tethers is wound on cylinder, when element and/or layer relative to each other move, these low-friction coatings reduce friction.In certain embodiments, the radial direction winding of low-friction material is placed between each continuous helical layer of high strength core.
In certain embodiments, hub intensity or hoop tension layer 108 is used to be wound around each helical coil winding layer of high strength core 102.There is the hoop tension layer of multiple different-diameter although shown in Figure 1 only as single hoop tension layer, its each be wound around single layer in some respects.In various embodiments, hub intensity or hoop tension layer 108 comprise high strength rigid material, or pulling force loading layer, and circle or the polyester film opened from core or high strength fibre are wound around such as to be used for stoping high strength core 102 layers.In certain embodiments, use hoop tension layer 108 reduces the friction in the continuous concentricity layer of high strength core 102 between compound bar further.In certain embodiments, high strength core 102 is not manufactured by concentricity layer, but comprise the element of multiple radial symmetric pattern on the contrary, each element by the constraint of the element of hoop tension layer 108 or compression, such as, each rod in tethers high strength core 102 by a bundle comparatively spillikin form.In certain embodiments, each element in the various layer of core 102, except central core 107, has same diameter and structure.In certain embodiments, all layers of core 102 have same diameter.In certain embodiments, outwards observe from tethers center, the helical wind angle of each pantostrat increases.
In certain embodiments, the high strength core 102 of tethers 101 is included in concentric low bulk modulus layer 103, or part is included in low bulk modulus layer 103, there is the skin 110 of the concentricity screws winding of some of the high strength core 102 being positioned at low bulk modulus layer 103, and be positioned at some skins 110 of high strength core 102 of low bulk modulus layer 103.In certain embodiments, when high strength core 102 stretches or when along electric conductor 105 stress application, the small radii housing of low bulk modulus layer 103 for allowing electric conductor 105 to be positioned at tethers 101, thus when maximum allow electric conductor strain be starkly lower than maximum permission core material strain time, restriction electric conductor strain permission boundary in.Concentricityly in the skin 110 of high strength core 102 arrange in the embodiment of low bulk modulus material 103, the skin 110 of high strength core 102 contributes to compression layer 103, to unload on tethers 101 compared with total tensile load of small scale as cost with the skin 110 of high strength core 102.In certain embodiments, as strain reduce mechanism, with spiral angle or along tethers 101 length variations diameter spooling electric conductor 105.Therefore, except considering the spiral angle (when core 102 strains under loads) of the electric conductor 105 of some strain relief of electric conductor, as extending linearly of axial screw spring, the relative softness of bulk modulus layer 103 take into account when the reduction of electric conductor helical form diameter when loading, thus take into account the strain relief by the second mechanism.When under the load supporting airborne flying platform or when reeling around cylinder, the strain in the electric conductor therefore reduced is the result stretching tethers.In certain embodiments, low bulk modulus layer 103 is not included in tethers 101.In certain embodiments, other element may reside in tethers 101.Such as, no matter command signal circuit, be conductivity or light, can be positioned at tethers 101.
In certain embodiments, the separation stock of insulating material 104 dynamo-electric ground insulated electric conductor 105.In certain embodiments, the every personal share in the resolution element insulated electric conductor 105 of insulating material 104 or wire, make eachly when being wrapped on sheave or cylinder to be slided relative to its adjacent electric conductor by insulated electric conductor.In certain embodiments, multiple elements of electric conductor 105 are embedded in the discrete component of insulating material 104, and when tethers 101 is wound on sheave, shear strain born by insulating material 104.In various embodiments, electric conductor 105 comprises the wire of various aluminium, copper or other electrical conductor material any, and wherein each comprises single or multiple stock.In various embodiments, electric conductor 105 is formed by any amount of independent wire or is comprised the one or more concentricity or coaxial layers being wound around around high strength core 102, being separated by insulation.In certain embodiments, the each element comprising electric conductor 105 comprise be wound around around hollow or low bulk modulus material, for increasing the multiple independent wire of the strain along electric conductor 105 individual component, at individual component place, damage is gathered or generating material surrender.In certain embodiments, insulation component 104 and low bulk modulus 103 are similar elements.
In various embodiments, sheath 106 comprises the mixture of metal, rubber, plastics, fiber and matrix, braided wire or other suitable material any or collection of material thus comprises and protect other element of tethers 101.In certain embodiments, sheath 106 is elements identical with insulating material 104.
In certain embodiments, sheath 106 has the surface characteristics or shape that reduce resistance.In certain embodiments, sheath 106 has the aeronautical dynamics profile for reducing resistance of such as wing profile.In certain embodiments, sheath 106 has the consistent helical groove 109 in the gap between dividing into groups with the coiled coil of electric conductor.Helical groove 109 can reduce tethers resistance, such as, when using in supporting airborne flying platform and supporting.
Fig. 2 is the diagram that the dynamo-electric tether embodiment with binding electric conductor is described, is helical groove space for the creativity.In shown example, the dynamo-electric tethers of lower resistance light weight is restrainted in conjunction with electric conductor 205 thus is boundary layer trigger element 209 leaving space on sheath 206 surface.In other embodiments, trigger element can comprise iron hoop, jagged edge groove or thread off around other device any in the boundary layer in the fluid flowing of tethers, thus before natural transition turbulence or introduce flowing whirlpool, and therefore increase the flow region that adheres on the surface of tethers, and therefore reduce resistance coefficient.In certain embodiments, element 209 is included in independent iron hoop on sheath 206 surface or recess, such as, recess in golf or flush surfaces eddy generator, such as triangular notches.In one embodiment, element 209 does not flush with sheath 206 surface, but press surperficial with sheath 206 flushes thus allow to be wound on cylinder under stress.In certain embodiments, the resistance according to the size of the operation Reynolds number selectors 209 of tethers 201 and interval thus when being minimized in a kind of operating condition of tethers or operating condition scope, noise, unstable power or its some combinations.Boundary layer trigger element 209 is placed on the position had relative to flows outside known orientation.In certain embodiments, tethers 201 surface is level and smooth or has consistent roughness.In certain embodiments, each electric conductor in electric conductor group at same electrical press operation, thus minimizes required insulation thickness.
Fig. 3 describes the diagram of assisting dynamo-electric tethers 301 embodiment of the lower resistance light weight of strain relief in tethers in conjunction with electrical conductive elements.In the example shown, tethers 301 comprises high-strength composite rod 311, and it is by low bulk modulus material 303, electric conductor 305 and insulating material 304 concentricity around.In certain embodiments, rod 311 and electric conductor 305 electric insulation.In certain embodiments, rod 311 does not insulate with electric conductor 305, but insulate with other electrical conductive elements in tethers terminal.In certain embodiments, electric conductor 305 comprises multiple independent insulated metallic filaments be wound around around high-strength composite rod 311.
Fig. 4 is the diagram describing the dynamo-electric tether embodiment of lower resistance light weight.In the example shown, tethers 401 has the length of 100 meters, comprises high strength core 402, and this core can be the polyaramid fibe of establishment.This example comprises electric conductor 405 further, and sheath 406.Electric conductor 405 comprises two establishment 16AWG copper wires insulated separately.Sheath 406 comprises the biased ethene wrapper layer of compression, and it is for location and compression electric conductor 405.When tethers 401 is not by pulling force, the combination of the compliance in the compression load in electric conductor 405 and sheath 406 is used as low bulk modulus layer 102, the equivalent of 103 and in other embodiments visible 303, by the length variations of high strength core 402 in certain weight range, reduce electric conductor 405 layers of length variations.
In some embodiments of the invention, as shown in Figure 5, show the dynamo-electric tethers 501 of lower resistance light weight, its middle level is rectangular cross section.In this embodiment, there is the tethers 501 of 500 meters of length, comprise multiple layers of high strength core 502.Every floor height intensity core 502, such as layer 510, the independent carbon fiber extrusion modling of multiple square or rectangular cross section can be comprised, it is designed to make high strength core 502 have the diameter less than the high strength core of equal value of cylindrical rod formation, because compared with cylindrical elements layer, packaging factor is higher.In certain embodiments, each carbon fiber extrusion modling in high strength core 502 is stretched out along spiral path thus is eliminated the latent stress when being assembled into tethers 501.In one example, each extrusion modling has the major cross-sectional dimension between 3 and 5 microns.
Because the spiral angle of layer 510 is little, so the stress because of distortion generation in length in independent carbon fiber extrusion modling is little.In certain embodiments, in high strength core 502, each carbon fiber extrusion modling is stretched out along spiral path thus reduces the latent stress in tethers 501 further.In this illustration, each extrusion modling has the major cross-sectional dimension between 3 and 5 microns.Tethers 501 comprises hoop tension layer 508 further, and it prevents the independent extrusion modling dislocation in the high strength core 502 in process, bending or low-tension.Tethers 501 can have hoop tension layer 508, and it can be the polyaramid braid be soaked in ethylene rubber.Utilize low bulk modulus layer 503 to be wound around hoop tension layer 508, it comprises rigidity and is attached to hoop tension layer 508 and the low firmness foam rubber in insulation 504.Electric conductor 505 can comprise the entity copper wire of multiple identical square cross section, and each and insulating material 504 insulate separately.Insulating material 504 can comprise the PVC extruded layer of each electrical conductive elements around electric conductor 505.Electric conductor 505 can be divided into two groups, and each group has the operating voltage of 5000 volts, and another group has the operating voltage of 0 volt.Electric conductor 505 is retrained by sheath 506, and it can comprise helical groove 509.Sheath 506 can be included in the extruding ethylene rubber on polyaramid braid.In certain embodiments, helical groove 509 is cut into sheath 506, and has the physical dimension of applicable tethers 501 typical operation Reynolds number.Such as, helical groove 509 can be 1 micron of dark and semi-circular cross-section of 2 microns wide, opens along every 10 micron pitch of tethers 501 circumference.
In certain embodiments, tethers is suitable for utilizing turbogenerator to support airborne power generation system.In the restriction that intensity and electrical conductivity require, relative to the mobile system resistance tied, the resistance of tethers is minimized.With reference to wing area, the total drag coefficients scope of tethers is from about 0.03 to 0.15.In this case, tethers effect has much higher resistance coefficient as wing.With reference to the cross section of himself, for flat cylindrical body, tethers has the resistance coefficient of about 1.2, but for large-scale Reynolds number, groove or depression make this number be reduced to approximate 0.6, for the Reynolds number of close limit, are reduced to 0.45.In some respects, larger groove can impel and reduce at the resistance compared with low reynolds number place, but only relatively little reduction.Less groove can impel and reduce at the resistance coefficient compared with high reynolds number place, and can cause more obvious reduction.
Fig. 6 depicts the diagram of various tether embodiment resistance coefficient, and axle 601 is drawn, and as the function of tethers Reynolds number, it is drawn along axle 602.First curve 603 describes the resistance coefficient with the tether embodiment of relatively large surface groove.Second curve 604 describes the resistance coefficient with the tether embodiment of less surface groove.3rd curve 605 describes the resistance coefficient with the tether embodiment of smooth surface.When the present invention is used to berth airborne wind turbine, the speed of airborne wind turbine must keep below the maximum level in blast situation.The surface configuration of the helical groove such as in FIG sheath 106 described, this surface configuration causes the resistance curve coefficient of such as the first curve 603 and the second curve 604, and therefore resistance coefficient when being increased in high speed also contributes to maintaining airborne wind turbine lower than maximal rate.As the first and second curves 603, shown in 604, low coefficient resistance starts to rise at higher Reynolds number (it represents higher speed in this example).Therefore, tethers is equipped with surface, such as helical groove, and when the apparent wind speed of preferred operations, it causes the resistance of expectation to reduce, but when the apparent wind speed higher than favor speed, it also can cause the resistance of expectation to increase.By increasing resistance when the apparent wind speed higher than desired speed, this effect is applicable to the design.
Many jacket surface process, the helical groove again such as described in sheath 106, increases resistance when also show at low speed before middling speed resistance declines.In some embodiments of the invention, the helical groove on sheath 106 is spaced apart and has certain size, makes the increase of the resistance coefficient when low speed lower than the apparent flying speed of minimum preferred operations of airborne wind turbine.In cross wind flying system situation, apparent wind speed can be significantly higher than ambient wind velocity.In certain embodiments, use different surface configurations at the diverse location place along tethers length, such as, close to bottom and the position close to tethers top, thus at the apparent wind speed of each location matches.In certain embodiments, only have the tethers part closest to aerial platform to be formed and do not reduce resistance.
In certain embodiments, helical groove is not cut into tethers surface, utilizes spiral iron hoop, linear iron hoop, depression or other boundary layer tripping mechanism to obtain the lower resistance in job area on the contrary.
In some embodiments of the invention, as shown in Figure 7, tethers can be used as the tethers of the airborne wind turbine of 400kW.This tethers 701 can be designed to the power of bearing 300kN with coefficient of safety 2.In the layer 702 replacing helical angle, tethers 701 can have the carbon fiber 1mm extrusion modling 711 of 370 strands.Interior stock (the 371st) core 707 has 2mm diameter.Helical angle on each pantostrat starts increase and on outermost layer, be increased to 5 degree with 1 degree at the ground floor that the freestone heart 707 is nearest.Extrusion modling is moderate elasticity modulus carbon fiber.10 layer 702 is had outward in core.The coated polytetrafluoroethylene of all layers thus reduce winding time friction.Outermost layer 711 has the helical angle of 1 degree, and outermost layer 710 has the helical angle of 5 degree.Intermediate layer has from the linear roughly helical angle being increased to outermost layer 710 of innermost layer 711, adjust this helical angle a little thus minimize Yin Lali produce around the moment of torsion bottom tethers.Outermost layer 710 is wound around with the helical angle being greater than approximate 1 degree of zero moment of torsion design, thus when airborne wind turbine is with circular flight path flight, allows rotating freely bottom tethers.Bearing resistance bottom tethers is inconsistent in bearing length of life, and have the non-linear of load on tethers is relied on, arrange helical angle that outermost layer 710 increases thus mate the average torque of every tensile load, this tensile load is from the bearing during operation lifetime.
At these layer of outside live conductor 705, it utilizes two-layer insulation to be insulated: the inner insulating layer 704 of FEP, and the external insulation layer 703 of medium hardness PVC.Be three one metal wires at each conductive part, every root utilizes FEP to insulate individually.In certain embodiments, conductive part utilizes the phase opponent of layer 710 the most to levy by spiral winding.Wire 705 can comprise aluminium electric conductor stock and be rotated so the shape of cross section shown in figure, and annealing before use FEP insulation 704.In certain embodiments, FEP insulation 704 is approximate is that 0.2mm is thick, and is configured to the electric screen barrier that wire 705 provides main, and this wire is with approximate 5000 volts of transmission DC electric currents.
By punch die extruded silicone layer, this punch die makes edge 709 chamfer angle, makes, when all wires are combined together around core external, to remain with helical groove from the teeth outwards.Helical groove is that rough 2mm is dark and have 16 countings around girth.Although only show single insulated electric conductor in the figure 7 to describe object, there is the continuous insulation electric conductor layer around tethers periphery.Because adjacent Chamfer Edge 709, edge combines thus forms groove.This insulated electric conductor spirally reels around carbon stock, therefore produces the helical groove around tethers.In assembly, all 16 sheaths 16 utilize heating be melted thus produce single consistent entity sheath.
Fig. 8 describes the shape of cross section of the various possibility embodiments of the dynamo-electric tethers of lower resistance light weight, the tethers 201 of the tethers 101, Fig. 2 of such as Fig. 1, or the tethers representing its measured resistance coefficient profile in figure 6.In various embodiments, tethers comprises the areal cross-section shape 801 along its circumference with multiple hemispherical cut, the areal cross-section shape 802 of vibration radius, be there is the areal cross-section shape 803 of surface defectivity (such as introduced by process of sandblasting those), or other suitable tethers any.In certain embodiments, tethers is other shape, and it causes increasing resistance coefficient on Reynolds number or speed.In certain embodiments, tethers is being out of shape by flying speed or on pulling force, makes reformed shape cause tethers resistance coefficient to increase.In higher wind and higher flying speed, the major part of the tethers of crosswind kite system stands higher than any given apparent wind speed by speed.In certain embodiments, tethers comprises areal cross-section shape, this shape higher than show when certain speed or Reynolds number resistance coefficient reduce (see shape 801 or shape 803).In certain embodiments, tethers only comprises this shape of cross section in the tethers part close to Kite, make when inertia wind speed or kite wind speed (kitespeed) increase, the apparent wind of the increase on the tethers close to attachment point place, ground does not have an impact to the reduction of tethers resistance coefficient.
Apparent from above-mentioned explanation, given herein explanation can configure various embodiment, and additional advantage and amendment are obvious to those skilled in the art.The present invention be not limited in its broad sense this display and describe detail and example shown.Therefore, this details can be departed from not departing from the spirit or scope that applicant generally applies for.
Claims (19)
1., for a high strength tethers for conductivity and tensile load, described tethers comprises:
Prostheses, wherein, described prostheses comprises central core, and wherein, described central core comprises axial rod;
Low bulk modulus strain relief layer, it is concentricity around described prostheses; And
Multiple electric conductor, described multiple electric conductor is located along the outside of described low bulk modulus strain relief layer.
2. high strength tethers as claimed in claim 1, wherein, described multiple electric conductor along the outside of described low bulk modulus strain relief layer by screw winding.
3. high strength tethers as claimed in claim 2, wherein, described multiple electric conductor is divided into multiple helical coil windings of one or more electric conductor, limits spiral spacer between the described helical coil winding of the described group of one or more electric conductors at the outer surface along described tethers.
4. high strength tethers as claimed in claim 3, wherein, each group in described multiple helical coil windings of one or more electric conductor is wound around strength members.
5. high strength tethers as claimed in claim 4, wherein, described strength members is compound bar.
6. high strength tethers as claimed in claim 1, comprise outer sheath layer further, described outer sheath layer comprises multiple boundary layer dropout feature.
7. high strength tethers as claimed in claim 1, wherein, the axial rod of described central core comprises composite material.
8. high strength tethers as claimed in claim 7, wherein, described composite material comprises carbon fiber and bound base body member.
9. high strength tethers as claimed in claim 7, wherein, described central core is cylindrical cross-section.
10. a system for the kite power generation hitched with tethers, described system comprises:
Ground station;
Kite, described kite comprises:
Main wing; With
Multiple turbine-driven generator; And
Tethers, described tethers to be attached in described ground station at first end and to be attached on kite at the second end, and described tethers comprises:
Prostheses, wherein, described prostheses comprises central core, and wherein, described central core comprises axial rod;
Low bulk modulus strain relief layer, it is concentricity around described prostheses; And
Multiple electric conductor, described multiple electric conductor is located along the outside of described low bulk modulus strain relief layer.
11. systems as claimed in claim 10, wherein, described multiple electric conductor along the outside of described low bulk modulus strain relief layer by screw winding.
12. systems as claimed in claim 11, wherein, described multiple electric conductor is divided into multiple helical coil windings of one or more electric conductor, limits spiral spacer between the described helical coil winding of the described group of one or more electric conductors at the outer surface along described tethers.
13. systems as claimed in claim 12, wherein, each group in described multiple helical coil windings of one or more electric conductor is wound around strength members.
14. systems as claimed in claim 13, wherein, described strength members is compound bar.
15. systems as claimed in claim 10, comprise outer sheath layer further, and described outer sheath layer comprises multiple boundary layer dropout feature.
16. systems as claimed in claim 10, wherein, the axial rod of described central core comprises composite material.
17. systems as claimed in claim 16, wherein, described composite material comprises carbon fiber and bound base body member.
18. systems as claimed in claim 16, wherein, described central core is cylindrical cross-section.
19. 1 kinds of high strength tethers for conductivity and tensile load, described tethers comprises:
Prostheses, wherein, described prostheses comprises central core;
Low bulk modulus strain relief layer, it is concentricity around described prostheses; And
Multiple electric conductor, described multiple electric conductor is located along the outside of described low bulk modulus strain relief layer.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36565510P | 2010-07-19 | 2010-07-19 | |
| US61/365,655 | 2010-07-19 | ||
| US40989410P | 2010-11-03 | 2010-11-03 | |
| US61/409,894 | 2010-11-03 | ||
| US13/185,507 | 2011-07-19 | ||
| CN201180045064.8A CN103118941B (en) | 2010-07-19 | 2011-07-19 | A kind of high strength with low hydrodynamic drag can up-coiler electric system chain and use the system of this tethers |
| US13/185,507 US8921698B2 (en) | 2010-07-19 | 2011-07-19 | High strength windable electromechanical tether with low fluid dynamic drag and system using same |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180045064.8A Division CN103118941B (en) | 2010-07-19 | 2011-07-19 | A kind of high strength with low hydrodynamic drag can up-coiler electric system chain and use the system of this tethers |
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| Publication Number | Publication Date |
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| CN105161190A true CN105161190A (en) | 2015-12-16 |
| CN105161190B CN105161190B (en) | 2017-10-03 |
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| CN201510600649.1A Expired - Fee Related CN105161190B (en) | 2010-07-19 | 2011-07-19 | High strength windable electromechanical tether with low hydrodynamic drag and system using same |
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Cited By (1)
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| CN108475559A (en) * | 2015-12-30 | 2018-08-31 | X开发有限责任公司 | Electromechanical halter for energy kite |
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