The present disclosure belongs to the technical field of new energy utilization, and provides an offshore oscillating water column wave energy conversion device with an external permeable structure. The offshore oscillating water column wave energy conversion device with the external permeable structure comprises an oscillating water column system, an anchoring fixing system and a permeable structure. According to the offshore oscillating water column wave energy conversion device with the external permeable structure provided by the present disclosure, the offshore oscillating water column wave energy conversion device and the permeable structure are effectively combined. Using an offshore floating structure, the offshore oscillating water column wave energy conversion device with the external permeable structure can be applied to deep and far sea areas with higher wave energy density, and the output power of the device can be effectively improved.

The present invention relates generally to facilities and systems capable of initiating and maintaining vertical flow, upward, within an extended-length water column by inducing changes in density throughout the column. Specifically, the induced (vertical) flow of water within an extended water column that is the present invention is accomplished through fluid aeration, with ambient air, which is directed toward producing ascending water flow rates sufficient to generate hydraulic pressure and hydraulic powered energy, through generated radial force in hydraulic turbines. It is another goal of this invention to utilize air infused water, derived from high-density and low depths, to create said vertical flow and induce turbine actuation through said unaltered, recyclable mediums—air and water—resulting in electrical power generation and desalination.

A fluid apparatus includes a hydraulic machine, a rotary electric machine connected to the hydraulic machine, and a power conversion controller that converts power from the rotary electric machine. A non-normal operation is performed in a warning state that differs from a normal state in which a normal operation is continued and an anomalous state in which operation is stopped to continue a stopped condition.

A solution mined cavity system and method is disclosed. The system comprises an underground cavity created by solution mining in salt deposits, an upper water reservoir, tubing means adapted to lead water from the upper water reservoir into the 5underground cavity and out of the underground cavity, and pumping means adapted to contribute to pumping water from the upper water reservoir via the tubing means out of the cavity.0

An energy conversion apparatus 1 comprises: a liquid tank 11 in which a liquid 10 is stored; a plurality of gas-receiving parts 12 that are provided in the vertical direction inside the liquid tank 11 and are free to rotate or move vertically; a nozzle 13 that, inside the liquid tank 11, ejects compressed gas from below the lowest positioned gas-receiving part 12; a gas cylinder 14 that stores compressed gas serving as a primary energy source and feeds the compressed gas to the nozzle 13; an output means 3 that outputs kinetic energy of rotation or vertical movement as secondary energy to the exterior of the liquid tank 11, the kinetic energy being generated in the gas-receiving parts 12 by a buoyant force that the gas-receiving parts 12 generate as a result of receiving the compressed gas ejected from the nozzle 13; and a recovery device 4 that returns the gas from the liquid tank 11 to the gas cylinder 14.

A turbine, in particular for harvesting energy in flowing air or flowing water, is easily adaptable to different application conditions and facilitating a comparably high degree of efficiency. This is achieved in that the basic shape of the turbine is cylindrical and is provided with blades which are parallel to an axis of the turbine. The blades are pivotally arranged in joints on the outer circumference of at least one turbine wheel. The blades are substantially L-shaped. The longer limb of the blade is curved preferably in a manner corresponding to the radius of the turbine casing, and the shorter limb lies within the surface line of the turbine.

The invention concerns an inter-blade profile (14) for a turbine runner blade, said inter-blade profile (14) comprising a profile (16), and a plug (18), forming a basis of the profile (16) and intended for being inserted into a corresponding hole (21) made in a blade.

A runner for a hydraulic turbine configured to reduce fish mortality. The runner includes a hub and a plurality of blades extending from the hub. Each blade includes a root connected to the hub and a tip opposite the root. Each blade further includes a leading edge opposite a trailing edge, and a ratio of a thickness of the leading edge to a diameter of the runner can range from about 0.06 to about 0.35. Further, each blade has a leading edge that is curved relative to a radial axis of the runner.

A fusegate for a hydraulic structure includes a trough with walls for attaching the normal barrage at a predetermined height, a pressure chamber provided between a base of the fusegate and the upper surface of the spillway, a means for pressurising the chamber according to a maximum predefined height of a water level upstream of the fusegate, the fusegate further comprising systems for breaking ice which are attached to the gate.

The invention relates to a floatable hydroelectric generator (10) for harvesting electrical energy from the flow (R) of water in a river. The generator assembly (10) includes a floatable chassis (12) to which are connected two spaced-apart rotational axles (18). An electrical generator (not shown) is mounted on the floatable chassis (12) and coupled to the rotational axles (18). A chain (20) is connected to the rotational axles (18) via pulley wheels (16). A plurality of water receptacles (22) are fixed to the chain (20), and each being orientated, when submerged, to present their major openings towards an oncoming waterflow direction (R). A plurality of minor openings (24) is provided through a wall of each water receptacle (22). A valve member in the form of a flexible flap (26) is located within each water receptacle (22) for controlling passage of water through said minor openings (24). The flexible flap (26) is adapted to selectively permit flow of water through the minor openings (24) into each water receptacle (22); but substantially prevent flow of water through said minor openings (24) out of each water receptacle (22). The generator assembly (10) of the present invention may be deployed at a desired location within a river—optionally as part of a larger array of such assemblies—to generate electricity on a substantially continuous basis.