To provide a radial flow fluid machine suppressing performance deterioration caused by seal steam.
This radial flow fluid machine includes: a turbine wheel 2; a rotating shaft 5 connected to the turbine wheel 2; a bearing 6 supporting the rotating shaft 5; a main flow passage 36 for arranging a rotor blade 35 on the turbine wheel 2 and allowing steam to flow; a labyrinth seal 31 provided on the periphery of the rotating shaft 5; and a working fluid supply flow passage 41 connected to the main flow passage 36 in a portion with the radial outer end 17 of the turbine wheel 2 positioned and leading working fluid to the labyrinth seal 31. The end of the working fluid supply flow passage 41 on the side of the labyrinth seal 31 is opened between the teeth of the labyrinth seal 31.
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NODA MASAMI
SHIBATA TAKANORI
HITACHI ENG SERVICE
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