Abstract: This fin is intended to be installed in a protruding manner inside a discharge pipe of a hydraulic machine. The fin includes a first face which has holes and a second face which is solid. The fin defines by itself, between the first face and the second face, a cavity connecting the outside of the discharge pipe to the holes in the first face.

Abstract: This wheel comprises a plurality of vanes (2) arranged on a crown (3) and is equipped with a tip-forming member (10) attached to a central region (32) of the crown or hub of the wheel (1), radially inside the vanes (2), the crown defining a wet surface (31) for guiding a flow (E) passing between the vanes. The tip-forming member (10) is provided with at least one opening (121) for diverting a fraction (E1) of the flow towards the internal volume (V10) of this member. This member comprises a frustoconical annular skirt (11) and at least one fin (15) arranged in its internal volume (V10) and able to modify the path of the flow fraction (E1) entering this volume through the opening (121). This fin (15) extends as far as the edge (112) of the skirt (11) which defines an outlet opening (14) of the member (10) for the flow fraction (E1).

Abstract: The invention relates to a unit comprising a hydraulic turbine (1), a duct (5) leading a forced flow of water to the turbine, a duct (8) discharging the outgoing flow from the turbine and vanes (20) for guiding the flow through the discharge duct. Each guide vane (20) is able to rotate about an axis (x22) secant to the wall (84) of the discharge duct. Means (30) are provided for controlling the angular position of the vane (20) about its axis of rotation (x22). Each guide vane (20) can also be retracted into the wall (84) of the discharge duct (8), and means (21) are provided for adjusting the extent to which they are withdrawn into the wall.

Abstract: The invention relates to a wheel (R) of the Francis type that comprises a ring (1) with revolution symmetry about the rotation axis (Z) of the wheel (R), and curved blades (21, 22) connected to the ring (1) and each having an outer peripheral edge (212, 222) and an inner central edge (211, 221). The connection points (B21, B22) between the ring (1) and the inner central edges (211, 221) of the blades (21, 22) are located on a same circle (C20) centered on the axis (Z). The connection points (A21, A22) between the ring (1) and the outer peripheral edges (212, 222) of the blades (21, 22) are located on at least two distinct circles (C21, C22) (D21, D22) centered on the axis (Z).

Abstract: A hydraulic machine through which a main flow of water passes including at least one turbine blade having an upstream end and a downstream end and a channel extending an entire length of the blade for tapping flow from the main flow adjacent the upstream end of the blade and discharging the tapped flow at the downstream end of the blade in a direction of the main flow.

Abstract: This fin is intended to be installed in a protruding manner inside a discharge pipe of a hydraulic machine. The fin includes a first face which has holes and a second face which is solid. The fin defines by itself, between the first face and the second face, a cavity connecting the outside of the discharge pipe to the holes in the first face.

Abstract: The invention relates to a machine through which a main flow (E) of water passes, including a turbine wheel (4), with at least a turbulent zone, reduced-pressure zone or cavitation zone (8, 10, 33) being formed close to said wheel. The wheel includes blades (6) disposed between a ceiling (28) and a belt (30). The machine also includes means for injecting a flow (E2) drawn from the main flow into the aforementioned zone (8, 10, 33) such as to alter the main flow (E) locally or increase the pressure in said zone (8, 10, 33). Said injection means inject the drawn flow (E2) from the ceiling (28) or from the belt (30) through holes (31, 32) provided in the ceiling (28) or belt (30).

Abstract: A Pelton hydraulic machine through which a main flow of water passes including at least one Pelton turbine manifold with at least a turbulent zone or a reduced-pressure zone being formed close to the manifold and wherein a secondary flow drawn from the main flow, and unaltered in relation to the main flow, is injected into the turbulent or reduced-pressure zone so as to alter the main flow locally or increase the pressure in the zone.

Abstract: The invention relates to a unit comprising a hydraulic turbine (1), a duct (5) leading a forced flow of water to the turbine, a duct (8) discharging the outgoing flow from the turbine and vanes (20) for guiding the flow through the discharge duct. Each guide vane (20) is able to rotate about an axis (x22) secant to the wall (84) of the discharge duct. Means (30) are provided for controlling the angular position of the vane (20) about its axis of rotation (x22). Each guide vane (20) can also be retracted into the wall (84) of the discharge duct (8), and means (21) are provided for adjusting the extent to which they are withdrawn into the wall.

Abstract: This wheel comprises a plurality of vanes (2) arranged on a crown (3) and is equipped with a tip-forming member (10) attached to a central region (32) of the crown or hub of the wheel (1), radially inside the vanes (2), the crown defining a wet surface (31) for guiding a flow (E) passing between the vanes. The tip-forming member (10) is provided with at least one opening (121) for diverting a fraction (E1) of the flow towards the internal volume (V10) of this member. This member comprises a frustoconical annular skirt (11) and at least one fin (15) arranged in its internal volume (V10) and able to modify the path of the flow fraction (E1) entering this volume through the opening (121). This fin (15) extends as far as the edge (112) of the skirt (11) which defines an outlet opening (14) of the member (10) for the flow fraction (E1).

Abstract: The invention relates to a wheel (R) of the Francis type that comprises a ring (1) with revolution symmetry about the rotation axis (Z) of the wheel (R), and curved blades (21, 22) connected to the ring (1) and each having an outer peripheral edge (212, 222) and an inner central edge (211, 221). The connection points (B21, B22) between the ring (1) and the inner central edges (211, 221) of the blades (21, 22) are located on a same circle (C10) centred on the axis (Z). The connection points (A21, A22) between the ring (1) and the outer peripheral edges (212, 222) of the blades (21, 22) are located on at least two distinct circles (C21, C22) (D21, D22) centred on the axis (Z).

Abstract: The invention relates to a hydraulic machine through which a main flow (E) of water passes, including at least one turbine blade profile (1) having an upstream end (8) and a downstream end (10), with at least a turbulent zone, reduced-pressure zone or cavitation zone (14) being formed close to said downstream end. The machine also includes means for injecting a flow (E1, E2) drawn from the main flow into the aforementioned zone (14). The injection means include a channel (16) for drawing said flow (E1, E2) from the main flow (E) and discharging same at the downstream end (10) substantially in the direction of the main flow (E).

Abstract: The invention relates to a Pelton machine through which a main flow (E) of water passes, including at least one Pelton turbine (54) manifold (56), with at least a turbulent zone or a reduced-pressure zone (64) being formed close to said manifold. The machine also includes means for injecting a flow (E4) drawn from the main flow, and unaltered in relation to the main flow (E), into the turbulent or reduced-pressure zone (64) such as to alter the main flow (E) locally or increase the pressure in said zone (64).

Abstract: The invention relates to a machine through which a main flow (E) of water passes, including a turbine wheel (4), with at least a turbulent zone, reduced-pressure zone or cavitation zone (8, 10, 33) being formed close to said wheel. The wheel includes blades (6) disposed between a ceiling (28) and a belt (30). The machine also includes means for injecting a flow (E2) drawn from the main flow into the aforementioned zone (8, 10, 33) such as to alter the main flow (E) locally or increase the pressure in said zone (8, 10, 33). Said injection means inject the drawn flow (E2) from the ceiling (28) or from the belt (30) through holes (31, 32) provided in the ceiling (28) or belt (30).