Patent ID: 8882443

Claim:
A turbomachine compressor comprising: a stator casing housing a plurality of compression stages that are spaced apart in an axial direction along the central axis of the turbomachine compressor, each compression stage comprising a row of rotor blades followed by a row of stator vanes; and an air injection system comprising at least one air injection passage through the stator casing and including an outlet segment that opens out in an inclined manner upstream from and directed towards a row of rotor blades into a set-back zone of an inside face of the casing, which set-back zone is in register with the row of rotor blades, wherein the set-back zone presents an acute angle relative to an inside face of an intermediate casing of the stator casing and relative to an inside face of a rear casing of the stator casing lying outside the set-back zone that is in register with the row of rotor blades.