Ventilation system for an downstream cavity of a centrifugal compressor impeller

摘要

The system has a flux deflection unit fixedly mounted in a lower cavity (38) for circulating ventilation air along a lower face (34) of a wheel (36) of a centrifugal compressor stage (10) in a centrifugal manner with respect to an axis of the wheel. The unit has annular sheets (70, 84) fixedly mounted in the cavity of the wheel for guiding the ventilation air, obtained from an outlet of a centrifugal compressor, radially from an interior towards an exterior along the lower face of the wheel. The sheet (70) has an L shaped or a U shaped cross-section and extends along the lower face.