| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial turbine suppressing secondary flow loss accompanying secondary flow swirl created at both ends of a nozzle blade and provided with a turbine nozzle making more fluid flow in a center of blade height of the nozzle blade. SOLUTION: This axial turbine is provided with a stage composed of a turbine nozzle and a turbine rotor blade arranged in an axial flow direction. Both end portions of a nozzle blade 1 of the turbine nozzle are supported by a diaphragm inner ring 2 and a diaphragm outer ring 3, and a flow passage 4 is formed to have its diameter expanded from an upstream stage to a downstream stage. In the axial turbine, trailing edges 1a at ends of the nozzle blade 1 supported by the diaphragm inner ring 2 and the diaphragm outer ring 3 are curved as a curvature to an outlet side, and an intermediate portion between the trailing edges 1a is formed to be straight. COPYRIGHT: (C)2007,JPO&INPIT
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