초록 ▼

An installation for extracting useful work, such as driving an electric generator from a fluid stream, includes a platform rotatable about a central axis and supporting a plurality of blades or vanes, each of which is rotatable about its individual blade axis to vary the angle of attack between the

An installation for extracting useful work, such as driving an electric generator from a fluid stream, includes a platform rotatable about a central axis and supporting a plurality of blades or vanes, each of which is rotatable about its individual blade axis to vary the angle of attack between the blades and the fluid stream during each revolution of the platform. The blades are coupled together so that each blade executes a similar motion during each platform revolution and so that the angle of attack of the fluid stream relative to a given blade is substantially zero when the fluid stream direction is perpendicular to the plane including the central platform axis and the axis of the given blade, the amount of variation in blade angle of attack during each revolution is variable to compensate for variations in the fluid flow.

대표청구항 ▼

1. A device for harnessing the energy of a fluid stream comprising: a platform rotatably supported on a central axis; a plurality of vanes supported on the platform for rotation about respective vane axes generally parallel to and displaced from the central axis; means for synchronizing vane ro

1. A device for harnessing the energy of a fluid stream comprising: a platform rotatably supported on a central axis; a plurality of vanes supported on the platform for rotation about respective vane axes generally parallel to and displaced from the central axis; means for synchronizing vane rotation about the respective vane axes relative to platform rotation about the central axis to provide each vane with the same average angular velocity as the platform including a second platform rotatable in the unison with the said platform and supporting means coupling the second platform to respective vanes, the angular velocity of each vane about its axis exceeding the angular velocity of the platform during half of each platform revolution and being less than the platform angular velocity during the other half of each platform revolution. 2. The device of claim 1 further comprising means for adjustably controlling the amount of dissimilarity between the vane and platform angular velocities. 3. The device of claim 1 wherein each vane has a chord aligned with the direction of fluid flow when the line joining the central axis and that vane axis is generally perpendicular to the direction of fluid flow, the vanes when positioned downstream of the line through the central axis perpendicular to the direction of fluid flow having their chords inclined to the flow direction in one sense while the vanes when positioned upstream of that line have their chords inclined to the flow diameter in an opposite sense. 4. The device of claim 3 wherein the maximum inclination of a vane chord relative to the flow direction is limited so that a line perpendicular to that chord at the vane axis always intersects the line perpendicular to fluid flow through the central axis outside the circular path of that vane axis about the central axis. 5. The device of claim 2 wherein, the means for adjustably controlling comprising means for modifying the angular relationship between the said platform and second platform. 6. In a device for converting the kinetic energy of a fluid stream into useful work having a platform rotatably supported on a central axis and in turn supporting a plurality of blades each rotatable about a respective blade axis generally parallel to and displaced from the central axis to vary the angle of attack between the blades and the fluid stream during each revolution of the platform, the improvement comprising: means coupling the blades together so that each blade executes a similar motion during each revolution of the platform, the fluid stream angle of attack relative to a given blade being substantially zero when the fluid stream is directed normal to the plane including the central axis and the given blade axis, and means for varying the amount of variation in blade angle of attack during each revolution of the platform, wherein the coupling means comprises a second platform rotatable about the central axis in unison with the said platform, which second platform has radially distributed thereabout a plurality of wheels each coupled to one respective blade, the wheels being in unison with the platforms relative to them rotatably supported on the second platform about axes alignable respectively with corresponding blade axes and rotatable with the same angular speed as that of the platforms but in the opposite sense, the means for varying including means for modifying the angular relationship between the second platform and the said platform, thereby generating a distance "e" between the axes of the blades and those of the respective wheels, wherein further respective wheels and blades are pivotally coupled together at points removed from the sprocket axis a fixed distance and from the blade axis a variable distance, and when the means for modifying has positioned a blade axis the distance "e" from its corresponding sprocket wheel axis, the distance between the pivotal coupling point and the blade axis varies from the sum of the fixed distance and "e" to the fixed distance less "e" once during each revolution of the platform. 7. The improvement of claim 6 wherein the platform and second platform are synchronized to rotate in unison by a pair of coaxial helical idler gears of like pitch but having opposite sense whereby rotation of the idler gear pair synchronizes the platforms while axial movement of the idler gear pair modifies the angular relationship between the platforms. 8. The improvement of claim 1 further comprising means including a central wheel for coupling all of the wheels together to execute one complete revolution about their respective axes for one complete revolution of the platform about the central axis. 9. The improvement of claim 8 further comprising means for turning the central wheel and therefore also each of the wheels to properly align the blades with respect to the direction of flow of the fluid stream so that in the case that the axes of the wheels are aligned with those of the respective blades all of the blades are aligned with the direction of flow of the fluid stream.