An arrangement for sealing a steam-cooled gas turbine

摘要

A steam-cooled gas turbine with a plurality of blades cooled by steam comprises a rotor for supporting the blades, the rotor composed of a plurality of rotor disks, the rotor including a steam supply passage extending in the rotor; a steam supply chamber, fluidly connected to the steam supply passage and the respective blades; a steam recovery chamber, including an annular recess defined in the high pressure side end face of the rotor; a steam recovery passage; and a catch in the form of radially outwardly convex and concave portions integrally connected to the rotor to be arranged alternatively along substantially the inner periphery of the opening of the annular recess; a closure in the form of substantially a ring for closing the opening of the annular recess; an engaging portion in the form of radially inwardly concave and convex portions alternatively arranged along the inner periphery of the closure; and the closure being attached to the rotor by the engagement between the catch and the engaging portions.