Patent ID: 6231301
Filing Date: 2001-05-15
Classification: F04D,F05D,Y10S

Abstract:
A fluid compressor, comprising:a blade array rotatable about a rotational axis, each blade of the array having a root, a tip, a leading edge, a trailing edge and a projected tip chord, each blade spanning a fluid flowpath that channels a stream of fluid through the compressor;a casing having a flowpath surface circumscribing and spanwisely spaced from the blade tips, the casing having a circumferentially extending groove in fluid communication with the flowpath for receiving fluid from the flowpath at a fluid extraction site and for discharging fluid into the flowpath at a fluid injection site circumferentially offset from the extraction site;the groove being defined at least in part by an upstream wall and a downstream wall, both walls extending to and adjoining the flowpath surface at respective upstream and downstream lips, the lips forming a mouth of the groove, the upstream wall being oriented at an acute angle relative to the adjoining flowpath surface, and the downstream wall being oriented at an obtuse angle relative to the adjoining flowpath surface so that the discharged fluid enters the flowpath with a streamwise directional component.