Patent ID: 6375417
Filing Date: 2002-04-23
Classification: F01D

Abstract:
An axial flow steam turbine including:a rotor; a radially extending bucket carried by the rotor, said bucket having a leading edge, a trailing edge, and a radially outer tip, an outer side wall disposed radially outwardly of said bucket and generally co-axial to said rotor, thereby defining a working fluid flow path; and a moisture removal pocket defined in said outer side wall, said moisture removal pocket including a chamber for receiving moisture and a slot for communicating said chamber to said working fluid flow path for allowing moisture flow radially from said flow path into said chamber of said moisture removal pocket, said slot including an axially upstream wall and an axially downstream wall, said axial downstream wall opening to said flow path axially downstream of said trailing edge of said bucket and said axially upstream wall of said slot opening to said flow path radially outside said bucket whereby said slot substantially overlaps said radially outer tip of said bucket, wherein said moisture removal pocket further includes a downstream gutter groove defined intermediate said downstream wall of said slot and a downstream radial wall of said chamber, and wherein said upstream wall of said slot is generally contiguous with and in a same plane with an upstream axial wall of the chamber of said moisture removal pocket.