CLOSED CIRCUIT STEAM COOLED TURBINE SHROUD AND METHOD FOR STEAM-COOLING TURBINE SHROUD

摘要

PROBLEM TO BE SOLVED: To improve turbine shroud cooling performance while reducing the quantity of a required cooling medium to the utmost and reducing cross flow effects. SOLUTION: A turbine shroud cooling cavity is divided and sections a plurality of cooling chambers and impingement-cools an inside wall in the radial direction of a shroud by sequentially receiving cooling steam. An impingement baffle is provided in each of the cooling chambers so as to receive the cooling medium from an entrance of the cooling medium in the case of the first chamber or from the chamber immediately on the upstream in the case of the second to fourth chambers, or impingement cooling of the shroud inside wall is carried out including a plurality of impingement holes.