MOVING BLADE OF STEAM TURBINE, AND STEAM TURBINE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a moving blade of a steam turbine capable of shortening the axial length of the turbine while suppressing the occurrence of loss due to separation of flow or secondary flow and suppressing degradation in turbine efficiency. SOLUTION: In the steam turbine including: a turbine rotor 7; a moving blade 1 secured to the turbine rotor 7; a shroud 3 provided on an outer circumferential side distal end of the moving blade 1; and an outer circumferential side stationary wall 4 internally embracing the turbine rotor 7 and forming an outer circumferential side passage wall of a steam passage, the shroud 3 has an inner circumferential surface 14 so formed that a moving blade outlet flare angleα3is greater than a moving blade inlet flare angleα2; an angleα1formed between the outer circumferential side stationary wall 4 adjacent to the upstream side of the moving blade 1 and the turbine central axis 50 is generally equal to the moving blade inlet flare angleα2; and an angleα4formed between the outer circumferential side stationary wall adjacent to the downstream side of the moving blade and an turbine central axis 50 is generally equal to the moving blade outlet flare angleα3. COPYRIGHT: (C)2010,JPO&INPIT