CONDENSED WATER DISCHARGE STRUCTURE OF STEAM TURBINE AND ADJUSTMENT METHOD FOR FLOW CHANNEL CROSS SECTIONAL AREA OF DISCHARGE GROOVE OF STEAM TURBINE

摘要

PROBLEM TO BE SOLVED: To enable an erosion risk to be lowered by restricting a steam amount discharged out of a discharging groove while a size of the discharging groove is standardized to attain an efficient design formation, improving a turbine efficiency and positively discharging excessive drain from the discharging groove so as to cause wetness of steam to be decreased down to an appropriate wetness.;SOLUTION: This invention relates to a condensed water discharge structure of steam turbine in which steam 100 flows therein and condensed water 101 of the steam 100 is discharged out of a steam passage 10 having a turbine rotor, a stator blade 7 and a rotor blade 6 arranged therein. There are provided: a discharging groove 14 forming the steam passage 10 therein and extending from a location adjacent to a base end part of the stator blade 7 to outside of a radial direction R to discharge the condensed water 101 as a relative clearance of specified spacing between two structures 21, 41 adjacent to each other in an axial direction A; and a spacer 8 arranged at a relative clearance of the specified spacing of the discharging groove 14 so as to adjust a flow passage sectional area of the discharging groove 14 defined by the relative clearance of the specified spacing.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2017,JPO&INPIT