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A compressor having either an axial or radial stage adjacent the air inlet includes a circumferential row of slots in the inner casing wall, the slots opening into the casing bore; a rotor having a leading row of compressor blades thereon rotatable within the bore with the tips of the blades adjacen

A compressor having either an axial or radial stage adjacent the air inlet includes a circumferential row of slots in the inner casing wall, the slots opening into the casing bore; a rotor having a leading row of compressor blades thereon rotatable within the bore with the tips of the blades adjacent the row of slots; and, the axial centerline of the circumferential row of slots being positioned axially forward of the axial centerline of the blades of the leading blade row with a substantial portion of the axial slot length of each slot being forward of the leading edge of the blades of the leading blade row. In a preferred form of the compressor, the inner casing wall includes a circumferential stationary ring having an inner wall for defining with the inner casing wall the bore in which the rotor rotates, the circumferential row of slots being formed in the ring wall.

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A compressor comprising: a compressor casing having an inner cylindrical casing wall defining a generally cylindrical bore and a central axis of rotation therethrough and including a circumferential row of slots formed in said inner casing wall; a rotor having a compressor blade row comprising the l

A compressor comprising: a compressor casing having an inner cylindrical casing wall defining a generally cylindrical bore and a central axis of rotation therethrough and including a circumferential row of slots formed in said inner casing wall; a rotor having a compressor blade row comprising the leading row of blades on sid rotor, said leading blade row comprising a plurality of blades rotatable about said axis within said bore with the tips of said blades adjacent said row of slots; each slot of said circumferential row of slots defined by an end wall and a pair of circumferentially spaced apart side walls, said side walls extending from said end wall toward said inner casing wall and defining therebetween at said inner casing wall an axially elongate opening into said bore, said side walls at said inner casing wall being generally parallel to the axis of said bore and forming at said inner casing wall an angle of 50°-70°with a radius of said bore extending from said axis, the inclination of said side walls causing said slots to be inclined relative to said inner casing wall at such an angle that the rotating blade tends to force air into said slots, and the axial length of each said slot being equal, within plus or minus 20%, to the maximum projected axial length of the blades of said leading row of blades on said rotor; the axial centerline of said circumferential row of slots being positioned axially forward of the axial centerline of the blades of said leading blade row and a substantial portion of the axial slot length of each slot being forward of the leading edge of the blades of said leading blade row.