| 摘要 |
#CMT# #/CMT# 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. #CMT#USE : #/CMT# System for ventilating a lower cavity of a wheel or rotor of a centrifugal compressor in a turbo machine (claimed) such as jet engine, and jet prop engine of aircraft or gas generator, in order to evacuate heat energy generated by the wheel. #CMT#ADVANTAGE : #/CMT# The annular sheets guide the ventilation air radially from the interior towards the exterior along the lower face of the wheel, so that the ventilation air is relatively fresh at a level of a radial inner part of the wheel and is heated by flowing from the interior towards the exterior along the lower face of the wheel. The heated air is subjected to less mechanical stress and is less sensible to hot air, thus increasing life duration of the wheel. The system permits to circulate fresh air along the radial inner and outer parts of the wheel. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a partial axial cross-sectional schematic view of a system for ventilation of a lower cavity of a wheel of a centrifugal compressor. 10 : Centrifugal compressor stage 12 : Annular diffuser 28 : Lower annular flange 34 : Lower face 36 : Wheel 38 : Lower cavity 70, 84 : Annular sheets. |
