| 摘要 |
PURPOSE:To aim at the improvement of turbine efficiency by placing within a shrouding segment a sheet metal provided with cooling orifices, and then providing a cooling passage on the moving-blade side peripheral wall. CONSTITUTION:Within a shrouding segment 11 is placed a sheet metal 17 provided with a plurality of cooling orifices 16 so that it is opposite to the moving- blade side peripheral wall 18 at a prescribed distance. On the moving-blade side peripheral wall 18 is provided a cooling passage 24 which connects the inside of the shrouding segment 11 and the upper stream side from a moving blade 14. Hereby, the moving-blade side peripheral wall can be efficiently cooled with only a small quantity of air, and accordingly, the efficiency of a turbine can be improved. |
