AXIAL-FLOW TURBINE STAGE AND AXIAL-FLOW TURBINE

摘要

PROBLEM TO BE SOLVED: To provide a high performance axial-flow turbine capable of reducing the loss of interference occurring when steam leaks through a clearance between a labyrinth packing and a rotating shaft and the steam is mixed, at the outlet of a stationary blade, with a steam in a passage part.;SOLUTION: The inside wall section inner diameter of a disk part 11 at the inlet part of the moving blade 5 is formed smaller than the outlet inner diameter of a stationary blade inner ring 2, the inside wall part inner diameter ϕx of the disk part 11 observed from a meridian plane is formed larger continuously toward the downstream side, and a disk section fin 10 for converting a rotating shaft radial speed component of steam leaked from a labyrinth fin 8 to a rotating shaft axial flow velocity component is fitted to the inlet part of the moving blade. Also, as required, the steam from the outlet part of the stationary blade 3 to the inlet part of the moving blade 5, and a stationary blade inner ring fin 9 for converting the rotating shaft radial velocity component to the rotating shaft axial velocity component of the steam leaked from the labyrinth fin 8 is fitted to the outlet part of the stationary blade 2.;COPYRIGHT: (C)2005,JPO&NCIPI