Patent ID: 9598964
Date: 2017-03-21
CPC Classifications: F01D,F05D,Y02T

Claim:
1. A steam turbine stationary blade with a hollow inner portion, including: a plurality of slots formed on a blade surface of the steam turbine stationary blade, extending in a blade height direction and provided in a plurality of lines, wherein the slots are located on a pressure side of the stationary blade, wherein the slots include a first slot located upstream in the turbine axial direction and a second slot located downstream of the first slot and having a slot width larger than the slot width of the first slot, wherein the first slot is located at a position within a range of l/L ratio from 0.6 to 0.8 where l represents a distance along the blade surface from a leading edge of the stationary blade to a given position on the blade surface and L represents a distance along the blade surface from the leading edge of the stationary blade to a trailing edge of the stationary blade, wherein the second slot is located at a position where the l/L ratio is larger than at the position of the first slot, and wherein the steam turbine stationary blade with the hollow inner portion is made of a plastically deformed metal plate.