| 摘要 |
A steam turbine (1A) through which a fluid flows along an axis is equipped with: a tip shroud (51) for turbine blades (50) that are provided on a shaft that extends with the axis as a center; an outer partition plate ring (11) that is provided on a casing so as to face the tip shroud (51) in a radial direction and be capable of rotating relative to the tip shroud (51) around the axis; seal fins (15) that extend radially inward from the outer partition plate ring (11) and that, with the tip shroud (51), form minute gaps (H) therebetween; and steam introduction surfaces (70a) that are formed on downstream sides of the seal fins (15) and are provided so as to face the seal fins (15) within cavities (C) where a main vortex (Y1), generated from a leakage flow passing through a minute gap (H), is generated, and that guide the flow, generated from the main vortex (Y1), toward the minute gaps (H). |
