Patent ID: 8491269
Filing Date: 2013-07-23
Classification: F03B,Y02E

Abstract:
1. A Francis type hydraulic machine traversed by a main flow (E) of water, comprising a rotor of a turbine which rotor includes a plurality of blades, arranged between a ceiling and a belt, in the vicinity of which eddy zones, reduced-pressure zones or cavitation zones can be formed along side walls of the blades adjacent the leading and trailing edges of the blades and between the blades as the rotor rotates during use, a plurality of inlet openings in the side walls of the blades adjacent the leading edges of the blades for tapping flow from the main flow (E) and a plurality of outlet openings in the side walls of the blades adjacent both the leading and trailing edges of the blades for injecting the flow tapped from the main flow (E) through the plurality of inlet openings, into the eddy, reduced-pressure or cavitation zones along the side walls of the blades as the rotor rotates so as to modify the main flow (E) or increase pressure of the main flow (E) in the eddy zones, reduced-pressure zones or cavitation zones along the side walls of the blades, and other openings formed in the ceiling and the belt for injecting a flow (E 2 ) tapped from the main flow(E) between the blades through other outlet openings.