GB2487404A – Rotor For Extracting Energy From Bidirectional Fluid Flows – Google Patents

Alternatively, it would be possible for the blade to be mounted to just one of the outer rim and inner surface, with the other of the outer rim or the inner surface remaining fixed. Alternatively, different forms of curve or spiral could be used for the inner and outer conic helix to produce a more complex shape for the blade. The connection may be curved, for example, a concave surface may be used to increase the surface area along the surface of the specially shaped rotor blade in order to spread the resulting hydrodynamic forces over a larger area and reduce internal stresses. In a particularly preferred embodiment the generators may be moveably mounted parallel to the generally conical surface in order to permit variation of the input rotational speed to the generators by movement along the cone surface as discussed above. Figures 5A and SB 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 Espalda Alta Causas

Acupuntura - Duração 55min - Comprar em Santai Spa Certain preferred embodiments of the invention will now be described by way of example only and with reference to the accompanying drawings in which: Figures IA and 16 show an embodiment of a rotor in side view and end view, Figures 2A and 26 show the rotor of Figure 1 with the outer peripheral rim partially cut-away so that more detail of the rotor design is visible, Figures 3A and 3B are perspective views of the rotor of Figures 1 and 2 with the outer rim partially and fully omitted, Figures 4A and 4B show an alternative embodiment of a rotor where the inner conic helix radius increases at a lesser rate than the outer conic helix radius, Figures 5A and 5B show a further alternative where the inner conic helix radius increases at a greater rate than the outer conic helix radius, Figures BA and 66 show an alternative embodiment where the helical pitch is decreased at a lesser rate than the rotor of Figures 1 and 2, Figures 7A and 76 show an alternative embodiment where the helical pitch is decreased at a greater rate than the rotor of Figures 1 and 2, Figures BA and 86 illustrate an embodiment of a two-stage rotor apparatus arrangement in side view and end view with the outer rim partially omitted, Figures 9A and 96 are perspective views of the two-stage rotor apparatus of Figure 8 with the outer rim partially and fully omitted, Figure 10 shows a two-stage rotor apparatus installed in a housing with generators on the outer rotor surface, Figure 11 shows a two-stage rotor apparatus installed in a housing with generators on the inner rotor surface, Figure 12 illustrates an arrangement with a pair of two-stage rotor apparatus installed on a tower type of structure for use on the sea bed, Figure 13 is a graph showing the variation in torsional forces generated by a two stage rotor apparatus as the ratio of the minimum radius do and maximum radius Do of the conic helix is changed, Figure 14 is a graph showing the variation in torsional forces generated by a two stage rotor apparatus with modification to the rate at which the inner conic helix radius increases compared to the outer conic helix radius, and Figure 15 is a graph showing the variation in torsional forces generated by a two stage rotor apparatus when the rate of decrease of the helical pitch is adjusted by altering the rate of increase of helical frequency.

Figures 6A and 6B show a further variation which has parallel in net and outer cones as in Figures 1 and 2, but in which the helical pitch decreases at a slower rate than the previously described embodiments. What is important for the rotor of the invention is that each conic helix is formed with a radius that increases along an axis of the rotor and a pitch that decreases as the radius increases. In preferred embodiments the first rotor and/or second rotor have a blade or blades formed by a surface extending between inner and outer conic helixes, the conic helixes each having a pitch that decreases as the radius of the helix increases. 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 U along the longitudinal axis 4, each helix 5, 6 possessing a different initial radius.

When the inner conic helix increases in radius at a slower rate than the increase in radius of the outer conic helix (i.e. Alternatively, the blades may be formed as surfaces generated by curves 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.

Dolor De Cabeza

With this arrangement when an outer rim of the rotor is present it naturally encloses an opening that requires an axial component of the flow for fluid to flow through the opening. A liquid flow may be induced between the two reservoirs as a consequence of externally applied natural or man-made forces.

Dolor Neuropático Crónico

The geometry of the rotors facilitates the conversion of the kinetic energy in the liquid fluid flow to rotational force or torque. For example, in a preferred embodiment the rotor is used in a turbine for generating electricity from tidal flows. Preferably the rotor is for generation of electricity from tidal flows. It is well known that the force felt in a pipe system is increased when the fluid is forced to turn the sharper of the two bends. Consejos para el dolor de rodilla . The multiple rotor housings may be aligned with the primary flow direction to allow effective operation in a reversible or cyclic flow such as a tidal current system. The generators may be low torque, high speed, high efficiency generators such as asynchronous generators as discussed above. Preferably the method comprises use of the rotor to produce energy from a tidal flow, and more preferably use of the rotor to produce electrical energy from the tidal flow.

  • Evita problemas de espalda
  • El suplemento líquido, por otro lado, se puede beber con leche dos veces al día
  • Mejorar la estabilización y movilidad del tren inferior
  • La realización de un sobreesfuerzo
  • Antes de aplicar el producto, se debe limpiar y secar la zona que se va a depilar
  • Floor – 1 a. $20 Model Floor
  • Ante la activación emocional
  • Se debe empezar por obtener un diagnóstico exacto del médico

As the fluid passes along the helical blade the decreasing pitch ensures efficient extraction of energy from the flow. The pair of conic helixes 5, 6 also have a pitch that decreases with the polar coordinate 8 as the radius increases. The rotor may have features as discussed above in relation to the rotor and two-stage rotor apparatus. Figure 14 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. The distance from the longitudinal axis at which the hydrodynamic reaction forces act is continuously increased or decreased by the change in radius of the pair of conic helixes. Since the two rotors are contra-rotating and oppose one another, fluid can flow in the opposite direction with the same result. One preferred option is the use of an Archimedean spiral with a linear increase in radius, can be used to produce a rotor with a simple shape based on a straight sided frustocone.