A hydrokinetic turbine has upper and lower vane mounts; a main shaft coupling the vane mounts to form an assembly mounted for rotation about a central axis; a set of vanes, each vane mounted between the upper and lower vane mounts for reciprocating rotation about its respective longitudinal axis; a vane angle control mechanism, configured to control angle of the vanes relative to the direction of current so as to provide an angle of attack, relative to the direction of the current, that is cyclically adjusted over the course of rotation of the shaft. A given vane is oriented: (i) substantially transversely to the direction of the current when the assembly's orientation causes the vane to be in a driving mode, and (ii) substantially parallel to the direction of the current when the assembly's orientation causes the vane to be in a driven mode.

A vortex generator apparatus including a fluid intake duct, a fluid tank including: a first fluid inlet port, a second fluid inlet port, and a fluid outlet port. A turbine is provided outside of the fluid tank in fluid communication with the fluid outlet port.

A vortex hydroturbine includes a tank to be filled with a liquid, such as water. At least one turbine is driven exclusively by flowing water to circulate the liquid within the tank and produce a vortex. A central turbine is driven by the circulating liquid and an electric generator is driven by the central turbine for producing electricity to be supplied to a load. A method for operating a vortex hydroturbine is also provided.

A flow power plant comprises a rotor rotating about a rotation axis and having a plurality of pivoting blades. Each pivoting blade is mounted to the rotor for pivoting between a position pivoted-in towards and a position pivoted-out away from the rotation axis. One separate electric machine operable both as a motor and as a generator is assigned to each pivoting blade for applying torques between the rotor and the pivoting blade. A controller separately controls the separate electric machines during each revolution of the respective pivoting blade together with the rotor around the rotation axis in such a way that a predetermined course of a pivot angle of the respective pivoting blade results between the pivoted-in position and the pivoted-out position. The predetermined course of the pivot angle is predetermined for a maximum recovery of energy from a flow flowing against the rotor transversely to the rotation axis.

A reactive blade turbine system works vertically, horizontally, or at an angle and clockwise or counterclockwise according to blade angle and locking position and adjusts to variations in fluid flow such as changes in tidal currents to generate power more efficiently regardless of direction of fluid flow. A method for generating electrical power from a continuous fluid flow via the reactive turbine system is also provided herein.

A subterranean energy storage system configured to store and subsequently release potential energy. Storage of potential energy is achieved by the transfer of a pseudo fluid from a first storage tank to a second storage tank located above the first storage tank, and is subsequently released by the transfer of the pseudo fluid from the second storage tank to the first storage tank. To transfer the pseudo fluid between the first and second storage tanks, the subterranean energy storage system comprises at least one continuous conveyor mechanism extending through at least one transport shaft, wherein the at least one continuous conveyor mechanism comprises a plurality of vessels arranged along a length of the continuous conveyor mechanism. The subterranean energy storage system further comprises an energy transfer means operably connected to the at least one continuous conveyor mechanism to transfer power to and from the subterranean energy storage system.

A gravitational vortex water turbine assembly is described wherein the water turbine is disposed below the bottom of the basin in which the vortex is induced. Preferably, the basin comprises a spiral-shaped side wall and the rotor blades of the turbine rotor are dimensioned such that they absorb the tangential, axial and radial component of the water flow of the vortex.

A pump device includes a drive unit, a pump unit and a transport unit. The drive unit includes a base frame, and a variable-speed drive device disposed on the base frame. The pump unit includes a rotating shaft driven by the drive device, a fan blade co-rotatably mounted to the rotating shaft, a drain housing receiving the fan blade, and a suction housing in fluid communication with the drain housing. The transport unit includes a plurality of transport tubes in fluid communication with the drain housing.

[Object of the Invention] An object of the present invention is to provide a water turbine power generator comprising a power generation mechanism provided with a water turbine unit and a power generator unit, and a locking mechanism for engaging the power generation mechanism with a support member, which is free from various drawbacks such as increase in size of the locking mechanism, difficulty of detaching the locking mechanism from a damming board forming the support member when the water turbine power generator is serviced, and so forth. [Disclosure of the Invention] A water turbine power generator comprises a power generation mechanism and a locking mechanism for engaging the power generation mechanism with a support member, wherein the power generation mechanism comprises a water turbine unit and a power generator unit, wherein the water turbine unit comprises a vertically extending cylindrical casing provided with a water inlet port at an upper part of a circumferential side wall and a water outlet port at a lower end, and impellers installed in the cylindrical casing, and wherein the locking mechanism engages the cylindrical casing of the water turbine unit with a damming board which is installed in a canal to form a support member, and wherein the water turbine unit is provided with a pair of impellers disposed coaxially in the cylindrical casing with blades of one of the pair of impellers and blades of the other of the pair of impellers twisted in opposite directions relative to the extending direction of the central axis of the impellers, the power generator unit comprises an inner/outer double rotational armatures-type power generator, and wherein one of the pair of impellers is connected to one of the inner/outer rotational armatures of the power generator unit and the other of the pair of impellers is connected to the other of the inner/outer rotational armatures of the power generator unit, and the locking mechanism engages the power generation mechanism with the support member without fixing the power generation mechanism to the support member.

A position-controlled wave power generating apparatus. A position-controlled wave power generating apparatus is included a floating part floatable on a body of water, a motion conversion unit coupled to a floating part, a power generating unit generating electricity using a generator connected to a motion conversion unit, and a position control unit positioned below a water surface to generate a thrust from the energy of waves.