| 摘要 |
PURPOSE:To effectively cool the shroud by the cooling air through each path in such a way that cooling paths are formed on a shroud which is installed at the tip of a turbine rotor blade, and the cooling paths are opened between bosses on the shroud and on the back sides of the bosses. CONSTITUTION:A multitude of cooling paths 24, 25 are made at the thick part of a shroud 20. All the cooling paths 24, 25 are extended in radial directions from the confluent part of a cooling path 22 of a turbine rotor blade 21, and on another hand, they are divided roughly into a group of paths 24 which open between bosses 23 of the shroud 20, and a group of paths 25 which open on the back sides of the bosses 23. The rotor blade 21 is turned by action of the turbine, and cooling air which passes through the cooling path 22 respectively passes from its confluent part through each path 24, 25 at high speed, and it is radially jetted through each opening port. The jetted cooling air actively and strongly cools the vicinity of the opening ports of each path 24, 25 by its convection, and cools the outer surface of the shroud 20. |
