Underwater vehicles capable of self-propulsion are described. An underwater vehicle includes a cross-flow turbine including two or more foils spaced apart from a main shaft. The foils have a pitch that is adjustable under control of a pitch control mechanism. The underwater vehicle also includes a frame supporting the main shaft. The frame enables rotation of the cross-flow turbine. The underwater vehicle additionally includes a generator-motor set including rotor and stator elements. The rotor element is in rotary communication with the main shaft.

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.

The present invention relates to a hydropower generator for generating electricity by rotating in a fluid flow direction, the hydropower generator comprising: a central structure installed so as to be able to stand erect in water; a rotator installed on an outer circumferential surface of the central structure, and having at least one resistive plate coupled to the outer circumferential surface thereof; a rotating ring provided between the central structure and the rotator to cause the rotator to rotate around the central structure; a speed changing unit which integrally rotates by means of one side thereof coupled to the rotator; and a generator having a motor shaft coupled to the other side of the speed changing unit, and generating energy by rotation of the motor shaft, wherein the resistive plate is located in the water and generates resistive force according to the flow of water while the rotator rotates, such that energy is generated from the generator. Therefore, the present invention can provide a hydropower generator which is efficient in management, control, and extension of lifespan, and is cost-effective in the installation thereof.

A driving fan device has a transmission device and multiple blade assemblies. The transmission device has a transmission seat disposed at a center of the transmission device. The blade assemblies are mounted on the transmission seat. Each one of the blade assemblies has a fixing portion and a tilting portion. The fixing portion is mounted radially on the transmission seat and has a pivotal end and a groove. The pivotal end is disposed away from the transmission seat. The groove is caved inwardly near the pivotal end and has an inner surface. The tilting portion is pivotally connected to the fixing portion and has a rotating part and a forced part. The rotating part is disposed at the tilting portion, is pivotally connected to the pivotal end of the fixing portion, and has an abutting surface corresponding to the inner surface. The forced part is connected to the rotating part.

A rotor including blades rotating around a rotation axis (X), each blade being configured to transmit to the rotation axis, during a revolution of the rotor around the rotation axis, under the effect of the flow of a fluid, alternately a driving torque that rotates the rotor, and a resistant torque tending to go against the rotation of the rotor, each blade including in a region of an outer longitudinal edge of the blade, a flexible part configured to retract towards the inside of the rotor, when the blade transmits the resistant torque to the rotation axis of the rotor, and to switch to a position extended towards the outside of the rotor, during the rotor half-revolution following a maximum retraction position, when the blade transmits the driving torque to the rotation axis of the rotor, the flexible part being driven only under the effect of the flow of the fluid.

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 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.