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 is disclosed for manufacturing a rotating part which belongs to a hydraulic machine of an installation for converting hydraulic energy into electrical or mechanical energy. This rotating part includes blades distributed about an axis of rotation of the rotating part and extending from a leading edge to a trailing edge. This method can include manufacturing, in steel, a first part of each blade, which defines the leading edge thereof, manufacturing a second part of the blade in a material other than steel and attaching this to the first part of the blade so as to form a trailing edge.

This Francis-type runner for a turbine includes a crown, a band and blades the number of which is not a prime number. These blades are made as one piece and extend between the crown and the band, and between a leading edge and a trailing edge each trailing edge has its concave face facing upstream over its entire length. In addition, first blades are uniformly distributed about a central axis of the runner in a number equal to a divisor of the total number of blades. Each of these first blades has a point of attachment of its trailing edge to the crown that is lowered by comparison with the point of attachment of the trailing edge to the crown of second blades, which are likewise part of the runner. Moreover, the ratio between, on the one hand, the radius of a circle centered on the central axis of the runner, perpendicular to this axis and passing through the point of attachment of the trailing edge of a first blade to the crown and, on the other hand, the radius of a circle centered on the central axis of the runner perpendicular to this axis and passing through the point of attachment of the trailing edge of the same blade to the band is less 0.15.

According to the embodiment of the present invention, a guide vane of a water turbine rotatable about an axis, including a guide vane for directing supplied flowing water toward the downstream side. The guide vane has a downstream end edge having an upper end portion and a lower end portion. The lower end portion of the downstream end edge is displaced in the direction orthogonal to an axis with respect to the upper end portion of the downstream end edge when viewed from the downstream side.

A centrifugal turbine having a single impeller having two separate halves which face away from each other, at least one impeller half having an outlet tube which rotates with the impeller, the impeller halves held together by pins with blades floating on the pins, the blades not being connected to the impeller halves; a housing having three components, one housing component containing the two impeller halves comprising an inlet, and two outer housing components having an outlet.

A power unit including an enclosed housing, a shaft passing through the central section of the enclosed, a motor located outside the housing and mounted to the first end of the shaft, a turbine located inside the housing and mounted into the shaft, the turbine includes a hub, a top end, a bottom end, and blades, sealing fins located at the bottom end of the turbine; and a pump located inside the housing and mounted on the turbine. The pump includes fins that are inserted in grooves located on the hub of the turbine. The fins of the pump are joined to the blades of the turbine creating that the pump, turbine, and shaft move as unitary unit. The fins of the pump maintained by two spaced crowns by insertion form cells that guide a flow of fluid. A space free of fluid with a defined volume occupies the bottom end of the pump. In a non-working position, the space free of fluid has a cylindrical shape. In a working position, because of rotation of the fluid, the space free of fluid has a paraboloid shape. The rotation of the fluid at a minimum angular velocity creates a virtual barrier, and generates a thrust.

A hydraulic turbine includes a rotor with a runner, which is concentrically surrounded by a stator, whereby the runner comprises a plurality of runner blades arranged and distributed in a ring around a rotor axis, and each runner blade extends between a runner crown and a runner band; whereby the stator comprises a plurality of guide vanes arranged and distributed in a ring around the rotor axis, and each guide vane extends between an upper stator ring and a lower stator ring; and whereby a predetermined clearance is provided at least between the runner band and the lower stator ring. A substantial reduction of pressure pulsations in the vane-less gap between said runner blades of said runner is achieved by substantially increasing said predetermined clearance.

A centrifugal turbine having a single impeller having two separate halves which face away from each other, at least one impeller half having an outlet tube which rotates with the impeller, the impeller halves held together by pins with blades floating on the pins, the blades not being connected to the impeller halves; a housing having three components, one housing component containing the two impeller halves comprising an inlet, and two outer housing components having an outlet.

A Francis turbine runner including a shortened band length and a shortened blade length combined with a reversed runner blade leading edge having a junction of the leading edge with the band forerunning a junction of the leading edge with the crown in the rotational direction, and a bandless runner including a shortened periphery length and a shortened blade length combined with a reversed runner blade leading edge having a corner of the leading edge at the outer periphery of the runner that is in advance of where the leading edge joins the crown in the rotational direction. Additional feature includes an inverted trailing edge curvature design on the runner blade that further shortens the blade length.