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|1. (WO2015115558) SEAL STRUCTURE AND ROTATING MACHINE|
|Applicants:||MITSUBISHI HITACHI POWER SYSTEMS, LTD.
|Title:||SEAL STRUCTURE AND ROTATING MACHINE|
Provided is a seal structure (2) for sealing a gap between a first structural body (10) and a second structural body (51) facing the first structural body (10) in a radial direction,wherein the seal structure (2) is provided with: a peripheral surface (4) formed on either the first structural body (10) or the second structural body (51), the peripheral surface (4) being parallel to an axis line; a plurality of seal fins (5) protruding toward the peripheral surface (4), the seal fins (5) being provided at gaps in the axis line direction from the peripheral surface (4) so as to form clearances (m); and protrusions (7) that form re-adhesion edges (15) between pairs of axially adjacent seal fins (5), the re-adhesion edges (15) being locations at which leak currents (SL) re-adhere that have passed through a clearance (mA) of an upstream-side seal fin (5a), and the protrusions (7) also forming first cavities (17) in which eddies (B1) are created that flow along the upstream-side seal fin (5a) toward the second structural body (51), and second cavities (18) in which currents (B2) are created that cause a contraction flow effect on a clearance (mB) of a downstream-side seal fin (5b).