| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam turbine capable of restricting the corrosion of a moving blade while improving the diffuser performance by restricting the burble of flow in an exhaust hood.SOLUTION: In a steam turbine 10 according to an embodiment, at the last turbine stage, a diaphragm outer ring 26a includes: an expanded portion 80 whose inner diameter expands radially outward as it goes to the downstream side; and an extended portion 81 extending horizontally from a downstream end of the expanded portion 80 opposite the leading end of a moving blade 24a from the radially outer side. A stationary blade 28a includes a guide vane 90 attached between the expanded portion 80 and a diaphragm inner ring 27a and disposed between the adjacent stationary blades so as to be inclined radially outward with respect to the axial direction of a turbine rotor. In a vertical cross section along the axial direction of the turbine rotor, an extension line L2 obtained by extending a cord line L1 of the guide vane 90 passes through a contact point p between the inner peripheral side of the extended portion 81 and a steam guide 40 constituting an annular diffuser 60.SELECTED DRAWING: Figure 2 |
