System for cooling a centrifugal compressor impeller

摘要

The system has an outer case (28) carrying an annular diffuser (12) that comprises an annular flange (26) extending along an impeller (11) of a centrifugal compressor (10). The flange is connected downstream to structural support components of a combustion chamber (14) of a turbo-machine. An annular plate (90) is fixed on the flange and covers an upstream side of the flange. The plate and the impeller delimit an annular passage (39) to discharge air from an outlet of the compressor. The plate and the flange delimit another annular passage to discharge a part of air flow exiting the diffuser.