FIELD: machine building.
SUBSTANCE: invention relates to power turbomachines and can be used in centrifugal compressors, booster and pumps. It is applicable to such centrifugal stages, where the inlet hole of the impeller wheel and outlet hole of supply canal are ring-type. Reduction of velocity profile distortion is achieved due to the fact that the internal diameter of the channel outlet hole is larger than the inner diameter of the wheel inlet, if leakage of the compressed medium takes place through the front seal of the stage, and less if leakage is provided through this seal.
EFFECT: invention allows increasing efficiency of such stages due to reduced distortion of speed profile at the wheel inlet by inflow or leakage of the medium being compressed through the front seal of the stage.
1 cl, 4 dwg
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