Patent ID: 11933323
Assignee: ONESUBSEA IP UK LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  E | IPC E  F

Claim 13:
14. A method of imparting force on a multiphase fluid, comprising:
rotating an elongated member about a longitudinal axis in a rotation direction, the elongated member having fixedly mounted thereto a plurality of impellers;
providing each impeller with a plurality of individual blades, each blade having a leading edge, a trailing edge, a suction side, a high pressure side, a first side engaged with the elongated member, a second side, a chord length, and a chord line defined by a line between the leading and trailing edges, each impeller being mounted such that a chord angle of each blade is defined by an angle between the chord line and the rotation direction and is less than or equal to a stall angle at which a maximum force is exerted on the multiphase fluid in a direction primarily parallel to the longitudinal axis; and
arranging at least one unobstructed opening through each individual blade at a location between the leading edge and the trailing edge, wherein the at least one unobstructed opening comprises a slot on the suction side and a plurality of orifices, the slot extending from the first side to the second side and defined by a bottom surface, a top surface, and a middle surface extending from the bottom surface to the top surface, the slot disposed between a first portion of the suction side and a second portion of the suction side, the first portion of the suction side extending from the trailing edge to the bottom surface, wherein the first side is partially defined by a first end of the slot and the second side of the blade is partially defined by a second end of the slot, and wherein each orifice of the plurality of orifices extends from the high pressure side to the bottom surface;
wherein the impellers are configured for subsea deployment and do not experience surge induced by boundary layer separation with any positive multiphase fluid flows.