The geometry of the rotors is based on pair of conic helixes 5, 6 that have an increase in radius r with a polar coordinate θ along the longitudinal axis 4, each helix 5, 6 possessing a different initial radius. 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. BACKGROUND The invention relates to a rotor for extracting energy from a flowing liquid, for example a tidal flow. FIG. 11 shows a cross-section of an alternative embodiment of a two-stage rotor apparatus installed in a housing 9. In the embodiment shown in FIG. This may allow for bidirectionality since substantially similar fluid flow can enter the two-stage rotor apparatus from either end with the same resulting power take off.
The use of multiple low torque, high speed, high efficiency generators mounted on rotor with a surface having a diameter that varies along the length of the rotor, wherein the multiple generators are arranged to be connected to the surface at different diameters to thereby run at different rotational speeds relative to the speed of rotation of the rotor is considered to be new and inventive in its own right, and therefore, viewed from a further aspect, the invention provides a rotor for generation of electrical power from a fluid flow, the rotor comprising a surface having a diameter that varies along the length of the rotor, wherein multiple generators are mounted to receive rotational force from movement of the surface at varying diameters thereof. FIGS. 5A and 5B show a further variation in which the radius ri of the inner conic helix 6 increases at a greater rate than the radius ro of the outer conic helix 5 to thereby form a pair of non-parallel conic helixes that are spaced closer together at the large diameter end of the rotor than at the small diameter end of the rotor.
Dolor Sordo Costado Derecho
This type of conic helix may be defined as a three dimensional spiral having varying radius r as a function of the polar coordinate θ but also having a third variable, the length l, varying also as function of the polar coordinate θ. The underlying mathematical spiral of the conic helix can be based on Archimedean, Euler, Fibonacci, Hyperbolic, Lituus, Logarithmic, Theodorus or any other known spiral having varying radius r as a function of the polar coordinate θ but also having a third variable, the length l, varying also as function of the polar coordinate θ. In one embodiment, the first and second rotors have opposed ends that are of the same diameter. The radial flow component is useful since the two opposed ends have a small pitch to the rotor blade and therefore transfer of flow between the two rotors is most effective when the flow has a radial component as well as an axial component.
Dolores Musculares Por Ansiedad
8A, the two rotors are mounted end to end on a common axis of rotation 4. In use, the rotors with counter-rotate as described above. Rotors 7,8 in two housings 9 as shown in FIG. Medicamento para dolor de espalda . Thus, conventionally rotors are designed with a design flow direction. The blade or blades may be formed as surfaces generated by straight lines between points on the inner and outer conic helixes at the same longitudinal distance along the direction of the axis of rotation of the rotor. In another embodiment, a first rotor as described above is provided in combination with a second rotor as described above, with the large diameter ends of the first and second rotors opposing one another, such that fluid exits the large diameter end of one rotor and then enters the large diameter end of the other rotor. To allow for rotation of the blade, the blade may be mounted on the outer rim and/or the inner peripheral surface, which would then be mounted for rotational movement, e.g.
In one implementation, the rotor apparatus is a generator rotor, and hence one embodiment comprises a generator including the rotor apparatus, for example a generator for generating electricity from tidal flows. In low flow speed applications it is more efficient to have a large diameter rotor that is able to capture high levels of torque from the low speed fluid flow. As the fluid passes along the helical blade the decreasing pitch may, in one embodiment, allow for efficient extraction of energy from the flow. The rotors may have features as discussed below in relation to the fourth aspect of the invention, for example in relation to the shape and form of the conic helixes, the number of blades, the outer rim and inner peripheral surface, generator features and so on. Some curves and/or the use of non-linear radius increases will result in conic helixes based on conical shapes with convex or concave sides, as discussed above.
Tipos De Dolor
In some embodiments, the method comprises selecting the features of the rotor based on the desired characteristics of the rotor performance. In addition, the operation of the rings of generators 13 outside of their operating range can be controlled and of course, all generators can be disconnected should the two-stage turbine become overloaded in freak fluid flows. In one implementation, the method comprises use of the two-stage rotor apparatus to produce energy from a tidal flow, and in one implementation, using the rotor to produce electrical energy from the tidal flow. In this embodiment the underlying spiral that forms the shape of the blades 2 is based upon an Archimedean spiral where there is a linear increase in radius r with the polar coordinate θ.
0.05 is based upon the rotor presented in FIGS. In one embodiment, the rotor housing has an inlet section and an outlet section. Dolor de senos y espalda . The larger helical pitch at the inlet and outlet end hence receives mainly or solely axial flow, which increases efficiency. 1 and 2, but in which the helical pitch decreases at a slower rate than the previously described embodiments.
Dolor Espalda Lado Derecho
The hydrodynamic reaction forces Fx, Fy and Fz are necessarily produced due to the continuously decreasing helical pitch or in other words, due to a continuous change in the direction of the fluid flow and thus a change in the velocity components u, v and w of the fluid between the velocity components at first and second arbitrary cross sections in the rotor, the first and second arbitrary cross sections being at different distances along the rotor length. 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.
Simultaneously, the helical pitch is also decreased by way of varying l as a function of θ continuously or in discrete steps along the longitudinal axis 4. The rate of decrease of helical pitch or the rate of increase of helical frequency in the embodiments of the Figures is linear. In one implementation, the first and second rotors have openings at their opposed ends that are not arranged for solely axial flow, but instead may be adapted to receive or expel fluid flowing with a radial component to its movement. Other variants discussed above involve the use of different changes in pitch for the decreasing pitch of the conic helixes. 1), the arbitrary cross sectional areas within the rotor increase at a slower rate. This is a rotor where the radii of the pair of conic helixes does not increase i.e. One embodiment is a rotor apparatus for extracting energy from tidal flows, wherein energy may be extracted by production of electricity, whereby the rotor apparatus functions as a tidal turbine.
- Apparatus as defined in claim 13, wherein said sheets are supported one above another
- Algunas enfermedades metabólicas,
- No se cumple con el proceso de masticación
- Análisis de sangre oculta en heces
- Energy conversion apparatus, comprising
- Unidad de Salud (Ac
- Se utiliza el efecto vasodilatador
In one implementation, the rotor is for generation of electricity from tidal flows. 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. Several generators may be placed around the periphery of the rotating outer rim in order to extract power, which, in one implementation, may be a maximum possible amount of power, and/or be placed in the internal central space of the rotor and extract power from the rotating inner peripheral surface. Given that the density of seawater is around 1000 kg/m3, the energy density of tidal currents can typically be of the order of 4000 W/m2. These parameters may be configured to increase the power extraction from a given fluid flow, wherein in one implementation, the power extraction may be a maximum power extraction, or to limit the power extraction from a given fluid flow.