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.

Hydrokinetic fluid turbines utilize a flowing body of liquid to translate the kinetic energy of the fluid into electric power or other useful energy. The available kinetic energy is proportional to the squared fluid velocity in an open channel with a fixed cross-sectional area. The proposed twin turbine system coupled with a cycloidal magnetic gear exploits the hydrokinetic energy existing in open-channels.

A device for retrieving energy of flowing water for the riverside is disclosed. The device uses a rotating disk to respectively connect with a first blade and a second blade through two rotating bodies. The first blade and the second blade are respectively located at the first position of an upstream side and the second position of a downstream side. Water pushes the first blade under the surface of water to swing from the first position to the second position, thereby rotating the rotating disk by a rotating distance. Thus, the second blade originally arranged over the surface of water reversely swings to the first position. Then, the second blade sinks in the water. Water pushes the second blade to swing to the second position, and the first blade rises and leaves the surface of water to swing to the first position.

An underwater device for water power conversion includes multiple cups, each cup constituted by a bottomless cup member and a bottom plate fitted pivotally in a freely rotatable manner, wherein the bottomless cup member blocks flowing water in a standing state and makes flowing water pass through in a lying down state, generating flowing water resistance difference between the two states. The cups are installed in a continuous member of a waterwheel submerged in flowing water so that the cup stands in a forward advance path and lies down in a reverse advance path. A water blocking plate is also provided in the reverse advance path so as to utilize centrifugal force to turn the bottomless cup member from the lying down state to the standing state, thereby making the cup turn or circulate continuously in flowing water.

The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

The bluff body attaches to an elastic mount and is capable of generate vortex shedding when the elastic mount orients the bluff body in a flow-line traverse to a fluid flow and vibrates in response to the vortex shedding. A harvester is located within the bluff body and is capable of generating power above a specified threshold in response to the vibration.

A turbine of a power generating system includes a rotary shaft, blades, stoppers and elastic members. Each of the blades includes a connecting side and an active side opposite to the connecting side, and the blades are disposed on the rotary shaft at intervals by a predetermined distance, in which the blades are pivotally connected to the rotary shaft through the connecting sides. The stoppers respectively correspond to the blades and are disposed over the rotary shaft for limiting expansion angles of the blades. Each of the elastic members includes a fixed end and a moving end opposite to the fixed end, and the fixed ends attach to the rotary shaft, and the moving ends respectively attach to the blades. Each of the blades pivots between an expanded position and a closed position.

A run-of-the-river hydroelectric generating plant is disclosed, in which river water is diverted downstream, used in the hydroelectric generation process, and sent back to the river. A high-mass, large diameter hydro rotor for hydroelectric power generation is disclosed. A large diameter circular horizontal water flow, the desired water flow regime, is created to float and rotate the high-mass hydro rotor, which is coupled to a turbine shaft. Extremely high torque and angular momentum is provided for conversion into extremely high energy output. The desired water flow regime can be augmented with different configurations of penstocks, intake channels, and discharge channels.