A turbine which uses fluid pressure to turn a shaft in a manner that does not allow for cavitation to be created.

A system for energy storage and electricity generation is described. The system includes an energy storage system providing compressed air and an electricity generation system. The electricity generation system includes an airlift pumping system pneumatically coupled to the energy storage system. The airlift pumping system includes a water collecting tank containing collecting water and a riser tube having a base immersed in the collecting water and configured for injection of the compressed air into the riser tube through the air pipeline to provide air bubbles within the riser tube that produce an upward flow of the collecting water together with the air bubbles. The electricity generation system also includes a hydro-electric power system driven by upward flow of the collecting water together with the air bubbles to produce electricity, and a water heating system for heating the collecting water in the water collecting tank.

The multi-staged cowl described herein allows to increase and maximize water mass flow and pressure drop at the runner cross-section of a hydrokinetic turbine so as to maximize produced power output, while respecting dimensional constraints provided by a shallow body of water, a river for example, in which the hydrokinetic turbine can be submerged. The multi-staged cowl described herein can thus be configured so as to allow water to flow through the hydrokinetic turbine at a substantially stable water mass flow, eliminating instability, avoiding vortices, minimizing cavitation and avoiding fluid separation to negligible levels, and can include an inlet, an outlet and multiple stages which can extend between the inlet and the outlet, so that water can flow therethrough in a water flow direction.

The multi-staged cowl described herein allows to increase and maximize water mass flow and pressure drop at the runner cross-section of a hydrokinetic turbine so as to maximize produced power output, while respecting dimensional constraints provided by a shallow body of water, a river for example, in which the hydrokinetic turbine can be submerged. The multi-staged cowl described herein can thus be configured so as to allow water to flow through the hydrokinetic turbine at a substantially stable water mass flow, eliminating instability, avoiding vortices, minimizing cavitation and avoiding fluid separation to negligible levels, and can include an inlet, an outlet and multiple stages which can extend between the inlet and the outlet, so that water can flow therethrough in a water flow direction.

The present invention relates to a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator, and more particularly, to a construction method for a tidal power generation system, in which auxiliary waterways are installed at both sides of a hydraulic turbine waterway in which the uniflow generator is installed, respectively, such that water is introduced into one side auxiliary waterway so as to generate power, and the other side auxiliary waterway is connected to an existing drain waterway so that the water used to generate power may be drained, thereby enabling the multiple-flow power generation only by opening and closing a required sluice gate.

The present invention relates to a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator, and more particularly, to a construction method for a tidal power generation system, in which auxiliary waterways are installed at both sides of a hydraulic turbine waterway in which the uniflow generator is installed, respectively, such that water is introduced into one side auxiliary waterway so as to generate power, and the other side auxiliary waterway is connected to an existing drain waterway so that the water used to generate power may be drained, thereby enabling the multiple-flow power generation only by opening and closing a required sluice gate.

The mutually supporting hydropower systems includes a first hydropower system, a second hydropower system, and a third hydropower system. Each hydropower system includes a hydropower unit, a number of waterwheels, a number of hoist devices, and a number of motors respectively connected to the hoist devices. Each waterwheel engages a hoist device. The motors are electrically connected to a hydropower unit. The waterwheels and the hoist devices are driven by the impact of seawater which is also used by each hydropower unit to produce electricity. 40% of the power from the first hydropower system is used to drive its motors. 30% of the power from the second and third hydropower systems are also used to drive the motors of the first hydropower system. The motors are therefore sufficiently powered to discharge seawater.

The mutually supporting hydropower systems includes a first hydropower system, a second hydropower system, and a third hydropower system. Each hydropower system includes a hydropower unit, a number of waterwheels, a number of hoist devices, and a number of motors respectively connected to the hoist devices. Each waterwheel engages a hoist device. The motors are electrically connected to a hydropower unit. The waterwheels and the hoist devices are driven by the impact of seawater which is also used by each hydropower unit to produce electricity. 40% of the power from the first hydropower system is used to drive its motors. 30% of the power from the second and third hydropower systems are also used to drive the motors of the first hydropower system. The motors are therefore sufficiently powered to discharge seawater.

The invention concerns a hydraulic turbine comprising blades (2) fixed to a runner crown (12) and to be actuated in rotation around an axis of rotation, each blade being comprised between a leading edge (8) and a trailing edge (10), a stationary head cover (14) and a chamber (16) being located between said runner crown (12) and said head cover (14) or within the head cover, said runner further comprising: means (22) forming at least one passage for water between said chamber and a chamber (28) in the runner tip; an upper portion (12.sub.1) and a lower portion (12.sub.2) of the said runner crown, said upper portion (12.sub.1) having a larger diameter than said lower portion (12.sub.2) so as to define a channel (24) between them, said channel leading to an exhaust volume (3) of the runner.

This invention discloses in particular an actuation cylinder (10) for controlling the movement of a ring-gate (40) of a hydraulic machine, said actuation cylinder (10) comprising a body (18) forming a first chamber (22) provided with a first duct (26) and a second chamber (24) provided with a second duct (28) which are designed to receive an actuating fluid through said first duct (26) and said second duct (28), said chambers being separated from one another by a piston (20) connected to an actuating rod (14) and able to move in said body in a first direction in which the volume of the second chamber increases while the volume of the first chamber decreases, and in a second direction in which the volume of the second chamber decreases while the volume of the first chamber increases, said piston being provided with a rod (30) connected in said second chamber to an area (20b) of the piston turned toward said second chamber, said area (20b) having a surface less than an area (20a) of the piston turned toward the first chamber.