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.
Dolor Neuropático Pdf
Figures BA and SB are side and end views with the outer rim 1 partially omitted. However, in the preferred embodiment the blades at the large diameter end 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. The resulting power extraction would be the same as the initial case but in reverse and the fluid would exit the rotor with only a longitudinal component.
A need therefore exists for an improved device for extraction of energy from liquid flows such as tidal flows. These parameters may be optimised to maximise the power extraction from a given fluid flow or to limit the power extraction from a given fluid flow if required. The method may include providing features of the rotor apparatus as discussed above in relation to the fourth aspect.
In operation, particularly in tidal turbine applications, the two-stage rotor apparatus may be supported on a floor, e.g. When the two-stage rotor apparatus is subjected to a variety of liquid fluid flow scenarios, such as tidal flows, the rotors extract the kinetic energy from the liquid fluid flow and convert it into a rotational force or torque which causes the pair of specially shaped rotors to rotate. However, the amount of power remaining in the liquid flow exiting the first two-stage turbine would be less than that contained in the original liquid flow. The first stage rotor receives the approaching liquid fluid flow possessing a longitudinal component and extracts a proportion of the kinetic energy by converting it into rotational force or torque that causes the first stage rotor to rotate.
Dolor De Oidos
With these arrangements the rotor and stator form an electrical generator set that is driven by the liquid flow and directly converts the motion of the rotor into electrical energy without the need to transfer the rotational force to an additional device. The outer rotating rim of the rotor may be arranged to act as the rotor in the electrical generator with a part of a stationary housing being the stator. Then aquatic life may pass through the device unharmed by being carried along by the swirling flow.
This enables the generators 13 to be moved within the rotors 7, 8 to respond to changes in the rotational speed of the rotors 7, 8. In this way, a relatively constant generator speed within the variable range of the generators 13 can be achieved through a range of fluid flows.
Preferred embodiments therefore require the use of these generators, rather than a single generator connected to a central rotating shaft. Simultaneously, the helical pitch is also decreased by way of varying I as a function of 0 continuously or in discrete steps along the longitudinal axis 4. Dolor de espalda al respirar hondo . The rate of decrease of helical pitch or the rate of increase of helical frequency in the embodiments of the Figures is linear.
In preferred embodiments the blade extends between and is mounted to both the outer rim and inner surface. The use of multiple low torque, high speed, high efficiency generators mounted on a generally conical surface of a 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 generally conical inner or outer rim, wherein multiple generators are mounted to receive rotational force from movement of the surface of the inner or outer rim. Outer conic helix 5 is a helix formed on the internal surface of the outer rim I and forms a varying outer radius ro of the blade 2. Inner conic helix 6 is a helix formed on the outside of the inner cons 3 and forms a varying inner radius ri of the blade.
Dolores Musculares Piernas
The three rotor blades 2 have a shape formed by a pair of conic helixes. Preferably the first rotor and the second rotor have a blade or blades of the same shape formed by similar conic helixes. The pair of conic helixes 5 and 6 are generated in a clockwise direction and have different initial radii which increase at an equal rate to form a pair of parallel conic helixes. This is a rotor where the radii bf the pair of conic helixes does not increase i.e.
Conversely, a non-linear increase in the inner and outer radii r with the polar coordinate 0 would provide a different shape, for example the external and internal conic surfaces may be curved. The blade or blades are preferably formed as surfaces generated by straight lines between points on the inner and outer conic helixes at the same longitudinal distan’ce along the direction of the axis of rotation of the rotor.
Dolor Neuropatico Curso
The rotor blade surfaces of the rotor are formed when the pair of conic helixes are connected together in the radial direction. This makes best used of the radial component of the flow exiting one rotor and entering the other. The blades 2 extend between the inner peripheral surface 3 and the outer rim 1 and hence form enclosed flow paths.
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Internally, the rotor hence has one or more flow passages formed between front and back blade surfaces, the outer rim and the inner surface. There may be an outer rim located about the outer edge of the blade and corresponding to the surface upon which the outer conic helix is formed. In a tidal turbine application, space may not be an issue and large diameters, for example lOm and 2am respectively can be utilised to greatly enhance the power output. Thus, through manipulation of the parameters of the rotor, it is possible to manipulate the extracted power output and optimise or restrict it as required.