With this arrangement the rotors are both mounted for rotation about a single axis and are preferably arranged and mounted for contra-rotation, i.e. 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.
- El estrés acentuado
- Consuma una alimentación bien balanceada, baja en grasas
- No comprobar si ha perdido funciones la articulación, esperar a asistencia médica
- El otro litro deberemos mantenerlo caliente para humedecer en él compresas de algodón
- El cuello
- Sin período de espera para servicios preventivos
Since the generators 13 in this embodiment are mounted on a block 12 with a surface parallel to the inner surface of the inner cone 3 the generators 13 can be moved along the surface by appropriate frame and stepper motors 14. The generators 13 can be secured to a common movable frame assembly or be separately moved along the frustum surface 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 longitudinal position of the S generators along the frustum.
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.
As the conic helix has a given geometrical direction, this being clockwise or anticlockwise, the hydrodynamic reaction force acts in the opposite direction and since the centre of the hydrodynamic reaction force is displaced at a radial distance from the longitudinal axis, a torsional force is generated that acts around the longitudinal axis of the rotor and tends to turn the rotor. Since the power available from the liquid flow is proportional to the cube of the liquid flow velocity, this provides an effective means of increasing the amount of available energy. Since the two rotors are contra-rotating and oppose one another, fluid can flow in the opposite direction with the same result. By enabling variable speed 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. This results in a relatively low speed of rotation of the rotor.