Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Philippe Geai

Jean-Michel Nguyen Duc

Jean-Marie Duchemin

Philippe Morel

The fluid transfer device comprises a stator assembly incorporating a plurality of return channels which pick up the high speed fluid flow leaving a centrifugal impeller of one stage of the turbomachine for the purpose of rectifying, slowing down, and conveying said flow to the inlet of another centrifugal impeller of an adjacent stage of the turbomachine. Each return channel is constituted by a continuous shaped individual tubular element. A first continuous return channel is defined by a set of varying sections defined by parameters and extending normally to a mean line situated in a predefined plane (P,P,P,) containing the axis of the machine. The mean line has a rectilinear first portion, a curved second portion forming a circular arc of radius R,, and a rectilinear third portion. The various return channels are identical and can be derived one from another by rotation about the axis of the turbomachine.

Device for transferring fluid between two successive stages of a multistage centrifugal turbomachine

Inducer equipment adapted to a pump having large induction capacity which cludes a case surrounding an inducer rotor having a plurality of blades leaving clearance relative to the case. The clearance between the peripheral portions of the blades and the case is of an increased value greater than the value of the normal clearance over a zone which extends both into a cylindrical first portion of the inside wall of the case upstream from the inducer rotor and into a portion of the inside wall of the case adjacent to the cylindrical first portion and overlapping an upstream portion of the inducer rotor over a distance from the leading edges of the blades of the inducer rotor. The ratio between the clearance of increased value and the clearance of normal value is advantageously greater than 10.

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Aubevoye, France

Philippe Geai