| 摘要 |
PROBLEM TO BE SOLVED: To optimally keep axial distance at a stage so as to reduce interblade loss by curving each nozzle blade circumferentially at a blade center part and onto the fluid outflow side in an axial direction in a turbine nozzle with a plurality of nozzle blades held between a diaphragm outer ring and an diaphragm inner ring. SOLUTION: A large number of nozzle blades 11 are arranged in a ring row being held between a diaphragm outer ring 12 and a diaphragm inner ring 13. A moving blade 15 extended from a rotor disc 14 is provided adjacently to the nozzle blade 11 so as to constitute the stage of an axial flow turbine. In this case, the nozzle blade 11 is so arranged that a line F connecting the rear edge of a root part to the rear edge of a tip part is inclined by an angleθ(about 0-5 deg.) to a radial line E of the nozzle blade 11. The nozzle blade 11 is formed being curved onto the fluid outflow side in a circumferential direction and also formed being curved onto the fluid outflow side in an axial direction by moving cross section in each height position in a blade length diection in relation to the radial line E.
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