| 摘要 |
In this seal structure (2), which seals the gap (Gd) between a first structure (10) and a second structure (51) that faces the first structure (10) in the radial direction and rotates relative to the first structure (10) around an axis line, one of either the first structure (10) or the second structure (51) has a base surface (4) and a step surface (5) protruding towards the other side from the base surface (4), and the other is provided with: a first fin (18) extending toward the step surface (5) and forming a first gap (mB) at the space with respect to the step surface (5); a second fin (19) at the downstream side of the first fin (18), extending toward the base surface (4), and forming a second gap (mC) at the space with respect to the base surface (4); and a protrusion (7) that is disposed between the first fin (18) and second fin (19) and that divides a leak flow (SL2), which has passed through the first gap (mB), into a first vortex (B3) along the first fin (18) and a second vortex (B4) along the second fin (19). |
