A runner for a hydraulic turbine or pump, including a plurality of plurality of blades, each blade being defined by a pressure surface, an oppositely facing suction surface, a leading edge and a spaced apart trailing edge, at least one of the plurality of blades having a gas inlet aperture and a gas passage for supplying a flow of oxygen containing gas to the trailing edge of the same blade. The same blade also includes a continuous opening in the trailing edge to admit gas out of the gas passage to the passing fluid during operation of the runner. The continuous opening extends over at least 15% of the developed length of the trailing edge.

A hydroelectric turbine installation includes a turbine, a water passage located upstream, a draft tube, a controller that controls operation conditions, a device for introducing oxygen-containing gas into water passing through the installation, a device for injecting water into the draft tube, and a device for controlling a flowrate of the water injected into the draft tube. The device for controlling the flowrate includes a control unit and a valve. The control-unit is configured to control the flowrate of the water injected into the draft tube in a way that the flowrate is a function of the operation conditions of the turbine. The flowrate set by the control unit at an operation condition of the turbine corresponding to an optimal efficiency point of the turbine is higher than a flowrate set by the control-unit at one or more other operation conditions of the turbine that do not correspond to an optimal efficiency point.

Said hydraulic turbine includes a wheel which is made to rotate about a rotational axis (X.sub.2) by a main water stream (F.sub.1) going from a penstock to a suction tube along a flow path that passes through the wheel. Said turbine also includes first means that are placed outside the flow path of the main water stream (F.sub.1) and enable the mixing of a secondary water stream (F.sub.2), taken from the flow path and located upstream from the wheel, and an oxygen-containing gas (A.sub.2). Said turbine also includes second means for injection, downstream from the wheel of the turbine, a water/gas mixture (F.sub.3) produced in the first means.

An energy generating device for generating energy from a flowing fluid, especially from a wind flow and/or from a water flow, comprises: a rotation body, the rotation body extending along an axis of rotation between a first point and a second point and the rotation body being adapted to rotate about the axis of rotation and the rotation body being formed from at least a first, a second, and a third rotation segment, wherein the rotation segments are joined together and arranged along the axis of rotation, and they form a region at least partly surrounded by fluid, wherein the second rotation segment is situated between the first and the third rotation segment and has a different diameter than the first and third rotation segment; and a generator device mechanically connected to the rotation body, wherein the generator device is adapted to generate energy which is produced from the rotation of the rotation body.

A method for driving a transmission mechanism output power in response to an anticipated fluid-pressure gradient field is provided. The method includes sensing the change of direction of pressure gradient field at a desired location from the different area of the transmission mechanism within fluid. The method further includes constructing fluid-pressure gradient field based upon isolation-fluid apparatus or low-density fluid space installed on a transmission mechanism within fluid.

A electricity generating system consists of the following components: Supply of compressed air. Non-corrosive water filled circular tank structure. Cribbage to secure equipment. Air jet Impellers. Air recapturing hoods. Air injection nozzles. Air entrapment chambers. Axial power transfer equipment for operating A.C. electricity generators. The supply of compressed air is obtained from several existing methods; such as a water wheel operating air compressing pumps. Compressed air is injected into air entrapment chambers attached to the impeller surface. Air entrapment chambers are nozzle filled at lowest reference point of circular tank. Chambers are filled in a rotation series. Impellers are rotated by the air lift forces being applied to one side of an imaginary vertical plane. Air released from impeller is captured and reused to drive the next in line impeller. The leveraged rotational force of the impeller axle drives a hydraulic pumps which spins an electricity generator.

Aerating system for the runner of a hydraulic turbine, the runner comprising a plurality of blades, such that inter-blade canals are configured between each pair of blades for the admission of air in the water flow circulating through the hydraulic turbine, such that the aerating system comprises at least one hydrofoil located in the inter-blade canal of the runner contacting the pair of blades configuring the inter-blade canal where the hydrofoil is located, such that the hydrofoil has a non-axis symmetrical profile, and such that at least one of the blades in contact with the hydrofoil comprises an aerating canal delivering air to the hydrofoil.

A runner for a hydraulic turbine or pump has a plurality of blades. Each of the blades is defined by a pressure surface, an oppositely facing suction surface, a leading edge and a spaced-apart trailing edge. At least one of the blades has a device for supplying a flow of oxygen containing gas to the trailing edge of the same blade. The device includes at least two separate gas inlet apertures and at least two separate gas passages, each extending from one of the separate gas inlet apertures to a separate group of orifices in the trailing edge of the same blade. Each of the separate group of orifices has at least one orifice to admit gas out of the corresponding separate gas passage to the passing fluid during the operation of the runner.

A method for driving a transmission mechanism output power in response to an anticipated fluid-pressure gradient field is provided. The method includes sensing the change of direction of pressure gradient field at a desired location from the different area of the transmission mechanism within fluid. The method further includes constructing fluid-pressure gradient field based upon isolation-fluid apparatus or low-density fluid space installed on a transmission mechanism within fluid.

The present invention generally relates to hydraulic machinery, such as hydraulic turbines. More specifically, the invention is directed to optimizing power consumption when the turbine is used in condenser mode. The present invention provides a novel hydraulic installation where the reduction of pressure in the spiral case during condenser mode operations is more efficient, limiting the power consumption if compared to state-of-the-art installations.