FIG. 10 is a graph illustrating the optimal amount of available power, which can be achieved through the selection of an optimal ratio of the cross-sectional areas of venturi throats to mouths, with respect to a range of likely wave periods. A more likely range of wave heights would be 3 to 6 meters, with respect to which the corresponding optimal amounts of available power would be 138 to 277 kW/m2. However, it is also intended to cover those energy devices, which operate on the ocean, or on other large bodies of water, and which employ venturi devices that are lifted partially, substantially, or entirely, by other means. This up-and-down motion of the propeller through relatively still waters compels the propeller to spin. 1. It includes a unidirectional or bi-directional propeller suspended from a buoy by a shaft or cable.
A turbine 120B is disposed in the throat 160 of the venturi and is connected by a shaft 124B to a generator 146B. The venturi shroud might fully or partially collapse as the venturi device descends on the falling side of a passing wave. As the buoy rises and falls, the submerged turbine is moved up-and-down through the relatively still waters beneath the waves, causing the turbine to rotate, and thus causing the shaft of an attached generator to rotate, thus generating electrical power. The constantly rising cost and depletion of non-renewable energy resources such as oil, natural gas and coal, has made the use of sources of renewable energy such as moving air, for example wind power, and moving water, for example natural flow of rivers or tides, a desirable basis for the creation of devices for generating energy from the kinetic energy of fluids.
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FIG. 9 shows the relationship between the maximum amounts of power that can be made available through the application of this invention, relative to the height of the waves driving the vertical oscillations of a venturi device. Repeating the calculation demonstrated above with respect to each possible relative throat diameter creates the graph in FIG.
In order to calculate the venturi factor for a particular venturi device, we need to know the specific venturi tube mouth and throat diameters (or equivalent specific venturi tube mouth and throat cross-sectional areas). For example, with respect to the two wave scenarios evaluated in FIG. FIG. 15 shows four power optimization curves, similar to the curve illustrated for 4-meter waves in FIG.
With respect to the wave conditions specified above, the amount of power available in the unaccelerated water flowing in to the venturi device’s mouth is 0.661 kW/m2. With respect to this range of choke speeds, the maximum amount of power that can be made available for extraction within the throat of a venturi device will range from 120 to 265 kW/m2, respectively. Another tradeoff to be considered in identifying an optimal venturi throat diameter is the fact that the amount of power that a turbine can extract from a flowing volume of water is proportional not only to the cube of the water’s speed, but also to the cross-sectional area of the flowing water (for example, to the cross-sectional area of a turbine located in the throat of the venturi and used to extract the power). Note that FIG. 11 reveals an optimal relative diameter for the throat of the venturi device (and a corresponding optimal relative cross-sectional area) when driven by waves of the specified kind, in water characterized by the specified choke speed.
- Estabilización de la columna
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- Vertical-Axis Wind Turbines
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- Secuelas de un infarto cerebral o de un traumatismo cerebral grave
- Núcleo sensitivo principal (situado en la protuberancia)
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15. The two lines in FIG. 183 kW/m2 is the optimal, or maximal, amount of power which can be made available by a venturi device submerged in water characterized by the specified choke speed when the device is driven by waves with the specified height and period. Dolor lumbar y diarrea . Abutments can be provided which limit the pivoting movement of the partition about the pivot axis. The vane 2 will swing towards the channel which has the lower fluid pressure. The vane 2 extends along the centre line 16 of the device 308. The fixed divider 306 is located between two side walls 310 and 312 such that two channels 313 and 320 are formed.
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Clearly, that would be absurd. 0.5), would only produce an average of about 16 kW when driven by waves with a height of 4 meters and a period of 8 seconds. With an air-based suction system it would likely be desirable to employ one-way valves, or some other mechanism, to prevent water from flowing in to the suction tubes when the partial, or full vacuum, drawing the air out of the tubes was lost. However, the cost of constructing and maintaining a 7-meter diameter buoy and venturi device, including a 6-meter turbine, is unacceptably high for a device with an output of only 30 kW in rather energetic 4-meter oceans. The arrangement of Figure 13 provides the advantage that the pulsating flow rotates the turbine 200 in one direction only and the arrangements is also more effective at rotating the turbine, particularly at low fluid flow speeds.
The resulting power is transmitted to buoy 26 a through primary electrical cable 144 which may also support the venturi shroud assembly as it hangs beneath buoy 26 a. 22A and 22B is connected to buoy 26 a by cable 144, the rising and falling of the portable venturi shroud generates electrical power. According to a third aspect of the present invention, an apparatus for converting the kinetic energy from a fluid medium into another form of energy comprises a duct, at least one moving partition separating the space within the apparatus into at least two channels, the or each partition being pivoted and being coupled to a converter for converting the movement of the at least one partition into another form of energy, movement of the at least one partition alternately increasing and decreasing the flow through the respective channels, the arrangement being such that the at least one partition is caused to oscillate by fluid flow in the duct.
However, it will be appreciated that variations and modifications may be made to the examples described within the scope of the present invention. Furthermore, since the power generated by a turbine enclosed in the venturi tube’s throat is proportional to the area swept by its blades, this same line specifies how the amount of power that a turbine could extract from water will change as a consequence of changes to its diameter. Furthermore, even though we will discuss the optimization of the diameter of the throat of a venturi device, relative to the diameter of its mouth, the same discussion and optimization procedure could apply with equal validity to the cross-sectional area of the throat of a venturi device, relative to the cross-sectional area of its mouth.
Preferably, the or each vane has a symmetrical cross- section along its longitudinal axis. In this embodiment, the interior wall portion 11 of the fricative nozzle portion 14 tapers in cross section from the inlet 10 at its upstream end towards the expansion chamber or diffuser 7 at the downstream end. The length 5 of the vane 2 is between 350 and 500mm. If the device is intended to function in an air stream, its overall dimension will be about an order of magnitude greater than if it is intended to function in a river.. Postura para dormir con dolor de espalda