In one embodiment the outer rim and/or inner peripheral surface have a generally conical surface, and multiple generators may be moveably mounted parallel to a conical surface in order to permit variation of the input rotational speed to the generators by movement along the cone surface. 1A and 1B with outer peripheral rim 1 partially hidden for clarity. For example, in a pipeline application, space may be limited and restricted to existing pipeline diameters, therefore a rotor having a relatively small minimum and maximum outer diameters may be used, for example 1 m and 2 m diameter respectively. In the embodiment where both the first rotor and the second rotor comprise a blade or blades formed between conic helixes, the two rotors have large diameter ends opposing one another and being of the same diameter. In general, for a low speed fluid flow rings of generators 13 can be engaged at the higher linear velocity end, this being at the larger diameter end of the rotor.
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By enabling variable speed connection to the rotor in this way, a relatively constant generator speed within the variable range of the generators can be achieved through a range of fluid flows. Since the generators 13 in this embodiment are mounted on a fixed motor mount 16 the generators 13 can be installed as rings of generators that can be engaged or disengaged at different locations along the longitudinal axis 4. The rings of generators 13 can be engaged or disengaged by stepper motors triggered by hard wired or wireless monitoring equipment and/or CPU so that the two-stage rotor apparatus is able to respond to changes in the rotational speed of the rotors 7, 8 and adjust the number of rings of generators 13 in use at any given time. As the fluid passes along the helical blade the decreasing pitch may, in one embodiment, allow for efficient extraction of energy from the flow.
Dolores Musculares Remedios
The inner and outer conic helixes may have the same decrease in pitch, although applications are possible where a different decrease in pitch for the inner and outer conic helix may be used. With this arrangement the rotors are both mounted for rotation about a single axis and may be arranged and mounted for contra-rotation, i.e. Further possible features of a two-stage rotor arrangement are discussed below. FIG. 13 shows one possible utilisation of the two-stage rotor apparatus as a tidal turbine. FIG. 10 shows an embodiment of a two-stage rotor apparatus that may function as a tidal turbine with a pair of counter-rotating rotors 7, 8 installed in a housing 9 along a common longitudinal axis 4. The housing 9 is shown in cross-section and the rotors 7, 8 are shown in partial cross-section. The rotors 7 and 8 rotate about a common fixed shaft 11 that is secured to the housing 9 and supported by bearings 10. To ensure that the flow passes only through the rotors 7, 8, labyrinth seals 15 are placed at either end of the rotors 7, 8 between an inner surface of the housing 9 and outer surface of the rims 1 of each rotor 7, 8. In this embodiment, the two ends of the housing 9 have a convergent/divergent geometry 16 designed to increase/decrease the fluid velocity and enhance the performance of the two-stage rotor apparatus.
Dolor Muscular Bayer
Rotors 7,8 in two housings 9 as shown in FIG. FIG. 15 is a graph illustrating the effect of increasing or decreasing the relative radii of the pair of conic helixes to form a pair of non-parallel conic helixes. 4A to 5B the increasing radius of either conic helix may increase at greater or lesser rates to form a pair of non-parallel conic helixes.
Dolor Espalda Media
Thus, the opening is perpendicular to the axis of rotation of the rotor apparatus and the blades may be formed to receive or expel fluid flowing in a generally axial direction, optionally in a solely axial direction. Ibuprofeno dolor lumbar . Viewed from a third aspect, the invention provides a method of manufacturing a two-stage rotor apparatus comprising: mounting a first rotor for rotation about an axis of rotation, the first rotor having at least one helical blade with a pitch that decreases in a direction along the axis of rotation; and mounting a second rotor for rotation about the same axis of rotation in an opposite direction of rotation, the second rotor having at least one helical blade with a pitch that increases in the same direction along the axis of rotation. Viewed from a sixth aspect, the invention provides a method of manufacturing a rotor comprising at least one blade arranged to rotate about an axis of rotation, the method comprising: defining an inner conic helix and an outer conic helix, the conic helixes each having a pitch that decreases as the radius of the helix increases; and forming the blade(s) as a surface extending between inner and outer conic helixes.
The parameters discussed above, including the radius of the conic helix, pitch of the conic helixes and the relative increase in radius of the inner and outer conic helixes may be varied linearly along the length of the rotor. Conversely, a non-linear increase in the inner and outer radii r with the polar coordinate θ would provide a different shape, for example the external and internal conic surfaces may be curved. The generators may be mounted, for example, on the internal surface of the inner cone of the rotor, or on the external surface of the outer rim of the rotor. For example, in one embodiment the rotor is used in a turbine for generating electricity from tidal flows.