Abstract: A two part metering adapter ring, for providing bleed air from the compressor of an aircraft engine, having a plurality of metering air flow passages. The adapter ring is secured to the outer casing stator support member and has a movable seal engaging a member on the inner casing stator support member. A pair of spring members hold the seal in contact with the seal engaging member on the inner casing stator support member.

Abstract: An extraction system for extracting steam from the blade path of an axial flow turbine apparatus in a circumferentially uniform manner. Steam is extracted through an extraction orifice having a circumferentially-varying throat portion, the throat communicating with a diffusing passage leading into a circumferentially-extending extraction manifold. The manifold is connected to an extraction pipe of predetermined cross-section area. Steam extracted from the blade path is conducted through the extraction pipe to an associated user apparatus. The dimension of the throat in the longitudinal plane relative to the axis of the shaft and the radial dimension of the manifold in a plane normal to the shaft axis are sized and cooperatively related such that steam is uniformly extracted from the blade path without creating significant pressure variations at various circumferential locations therewithin.

Abstract: In a method of widening the zone of stable operation of an axial-flow fan, and of attenuating noise generated thereby, a portion of the flow medium is drawn off upstream of the fan and is returned to a zone at the periphery of the fan rotor. The invention also includes an axial-flow fan for carrying out the method.

Abstract: A system is shown for cooling and sealing gas turbine blade structures and discs. A coolant fluid of a required pressure enters an annular chamber radially outwardly of an annular array of stationary blades. The cooling fluid passes through these stationary blades into an inner annular chamber disposed radially inwardly of the stationary blades. The cooling fluid is permitted to leak out upstream between an upstream seal wall member of the inner annular chamber and a shoulder portion of an upstream rotor disc. The cooling fluid is also permitted to leak out downstream from the inner annular chamber between a downstream seal wall member of the inner annular chamber and a shoulder portion of a downstream rotor disc. The downstream wall member also contains angularly disposed passageways which direct jets of pressurized cooling fluid into ports on the adjacent downstream rotor disc.