CA2891423C – A Flowing-water Driveable Turbine Assembly – Google Patents

The anchoring cables are equipped with vortex suppressants to reduce their hydrodynamic drag and reduce any vibration caused by water flow. Water current nominal flow velocity, interchangeably referred to as water current speed, can vary between Om/s (calm) and 8m/s (storm conditions) and the optimal water current speed for peak power output from the turbines 110 is about 2.5m/s. The mean water current speed at any particular site depends on factors such as depth of water column, location of turbine assembly and the bathymetry of the sea bed. Additionally, the winches may be used to adjust the orientation of the turbine assembly about the X, Y and Z axes and, in doing so, orientate it in the optimal direction when anchored to the sea bed. This situation will be reversed when the tide changes and water flows through the duct in the opposite direction and arrow T is reversed (i.e.

The boundaries between the duct 26 and the flared annular sections 20a, 20b each have an annular gap 34a, 34b. The gaps enable water flowing outside the turbine module to enter the diffuser (i.e. Once installed the BM Integrates with the ‘conical’ diffuser and concentrator sections (which form part of the PMSS) to enhance performance over that achievable in open ocean conditions. For example, the rotor 132 of the turbine 110 may be located in a duct in fluid communication with a concentrator at one end of the duct and a diffuser at the other end of the duct, like the duct 26 and the pair of flared annular sections 20a, 20b shown in Figure 6. The turbine 110 is driveable by water flowing in either direction through the rotor 132 and generates electrical power. The anchoring cables 44a, 46a – 44h, 46h of each pair of anchoring cables converge from the frame 14 of the turbine support 6 to their respective anchoring points 48a – 48h. The mean angle of inclination of the anchoring cables of each pair of anchoring cables with respect to the horizontal is approximately 30 degrees.

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The mooring lines 145a ¨ 145d and the tag lines 146a ¨ 146d of the anchoring cables are equipped with vortex suppressants to reduce their hydrodynamic drag and reduce any vibration caused by water flowing past them. The tag lines are made of different material to the mooring lines and the tag lines have a greater elasticity than the mooring lines. The ballast tank 114 is located midway between equal amounts of fixed buoyant material 112 to minimise instability about the Y axis of the turbine assembly when the buoyancy of the ballast tank is being varied. Dolor de espalda cansancio y sueño . Referring to Figure 11, the buoyancy devices 107 are secured to the frame 1006a, 206a, 306a. Each buoyancy device comprises a fixed buoyant material 112, such as foam, at opposite ends of the buoyancy device and a ballast tank 114 located in between the fixed buoyant material.

Referring now to Figure 28, another aspect of the present invention will be described in more detail. Referring to Figure 29, there is provided a floating turbine assembly 104 of the present invention tethered using an anchoring system having four mooring lines or mooring line runs 145a, b, c & d attached at four anchoring points 148a, b, c & d fixed to the sea bed. This is unlike traditional anchoring systems, such as gravity anchors or columns driven into sea bed, which have an operation depth in the bottom third of water column where power extraction from water current is sub-optimal because the nominal flow velocity of the water currents are slower down there. The turbine shown in Figure 1 is not ducted, although as duct may be fitted around the rotor to shield the turbine from turbulence caused by any adjacent turbines or wave action and to increase efficiency of energy extraction from the water current.

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The ends of the flared annular sections 20a, 20b facing away from the duct 26 are each equipped with an array of transverse vanes 36a, 36b. The vanes help prevent ingress of debris into the duct and help straighten the water flowing into the turbine 28. The vanes induce a rotational flow into the water flow to increase the energy extraction of the turbine. The fibre or tape strands stream with the water flow to form a fairing, or a hydrofoil.

  • Cambios hepáticos
  • Tumores en el riñón, los uréteres o la vejiga urinaria
  • Piel amarilla o color amarillo de la esclerótica del ojo (ictericia)
  • Tener algo atascado en el oído
  • Whether the sun is brightly shining or obscured by clouds; and
  • Alteración de cualquier par craneal
  • Estimula la curación
  • Repite su uso todos los días hasta relajar por completo el cuello

Rotating faired sections which fit over the tension member and align with the flow; Spiral sections either fitted to or incorporated into the structure of the tension member, or other proprietary vortex suppression system. The frame 14 is divided into five turbine module docking bays 16. Each docking bay 16 is accessible through the top of the frame to receive a respective turbine module 10. Each docking bay has a pair of flared annular sections 20a, 20b connected to the frame 14 of the turbine support 6. One flared annular section is located at each end of the docking bay. The centre of gravity of each pair of turbines is located approximately midway between the buoyancy devices to minimise instability about the X axis. The turbine is located approximately midway between the buoyancy devices to minimise instability about the X axis of the turbine assembly which passes through the central axis of the turbine.

Tecnicas De Relajacion

The turbine assembly 104 is orientated with axis X through the turbine 110 generally in line with arrow T so that as much water as possible flows through the turbine in a straight path. The floating turbine assembly 104 is provided with a mechanism for detecting water speed, for example a water speed sensor. The floating turbine assembly 104 also has a buoy 1004 connected to the central buoyancy device 107 with buoy line 1005. The turbines 110 and rotors 132 are in an upright orientation to prevent them from turning in the current and generating power, and in this position mechanical braking is also provided by the gearing in the turbines.

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Thus, the buoyancy device is shaped so that, when in use it is positioned on the turbine assembly, it is broader about its base than about its apex, and the upward facing surfaces of the buoyancy device are more closely aligned with the vertical than the downward facing surfaces. The upper part of the buoyancy devices are streamlined, and the lower parts are bluff shaped so that, in addition to any resistance to motion provided by the buoyancy or the anchoring, the hydrodynamic drag force associated with moving the buoyancy device downward through the water is greater than the hydrodynamic drag force associated with moving the buoyancy device upward through the water. The floating turbine assembly 104 also has a buoy 1004 connected to the central buoyancy device 107 with buoy line 1005. Figure 25 shows the same floating turbine assembly 104 from above, again showing mooring line 145a is broken.

The floating turbine assembly 104 is now ready to be raised to the surface. As the submersible 1012 is tethered to the surface vessel, the maximum communication range is the maximum length of the tether. Dolor en las articulaciones y fiebre . Referring back to Figure 18, the respective winches release the upstream upper and lower lines 145b,c, such that the floating turbine assembly 104 rises to the surface of the water as shown in Figure 19. Figure 19 shows arrow X, which indicates the direction of movement of the floating turbine assembly 104 to the water surface. Referring now to Figure 31, at some point the speed of current Z will be determined to be too low to generate power, for example this can be predetermined and set by a threshold value determined by the specific combination of equipment used on-board the floating turbine assembly 104. When the speed of the current falls below the threshold the turbines 110 and blades 132 are rotated into an upright orientation, i.e.

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Figure 23 shows the floating turbine assembly 104 being towed by vessels 1003 and 1002 once detached from the sea bed. Figure 28 also shows some optional features of this system diagram. It is also likely that a maximum threshold will be set to ensure that the tension in the tether does not exceed a predetermined value where this predetermined value is selected to reduce the likelihood of damage to the tether through excess tension in the tether. The turbine support’s electrical power management equipment includes a step-up transformer (not shown) for transmission of the generated electrical power to a shore, or offshore, facility via a power cable 140. A communication cable 142 from the turbine assembly accompanies the power cable. Que me tomo para el dolor de espalda . Without a tether for communication, suitable underwater wireless communication needs to be provided with the associated difficulty and expense in doing so. In addition, the winches may be arranged in only one of the buoyancy devices, with points of attachment for pull lines distributed about the turbine assembly.

The respective one or more lines of DC 1061 are then provided to an Active Front End 1052 that reconverts the DC into AC. The winches are externally activated, typically by a remote operated vehicle, although the winches may be activated by their own electric motor. Alternatively, the winch with two pull lines can be substituted by a remote operated vehicle to perform the task of submerging the turbine module to dock with the turbine support. The variable positive buoyancy is reduced by filling the ballast tanks 114 with water. The buoyancy of the turbine support may also be adjusted by emptying the water from the ballast tank and replacing it with air to increase positive buoyancy. The anchoring cables 144a ¨ 144d diverge outwardly from turbine support to the water bed. Approximately the bottom ten metres of the hole are in bed rock 150 and approximately the top five metres of the hole (including the open mouth of the hole) are in weathered rock 152. The diameter of the hole is approximately 0.25m into which a single or multiple tendon anchor 154a is installed and grouted.

Power transmission cable incorporating power conductors and communications (i.e. 2 metres in both the horizontal and vertical planes. The anchoring cables may be (high performance) synthetic rope, steel / wire rope, chain, solid metallic rod or solid composite rod. For example, a vortex suppression system may be fibre or tape strands incorporated or attached to the anchoring cables. Reduced positive buoyancy may be desirable to reduce the force required to submerge the turbine assembly during its installation at a target location. The free ends of the mooring lines are fixed to respective anchoring points. 148d have been fixed to the sea bed. The variable component of positive buoyancy provided by the ballast tanks 114 can either be varied (i.e.