| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling system for reducing the temperature of a platform down to a level required for meeting the durability requirement of the steam or air cooled bucket of a gas turbine. SOLUTION: The bucket 10 has an airfoil 12, a bucket root 14, and the platform 16 between the airfoil and the bucket root. The airfoil includes a serpentine cooling circuit 18, the platform includes a plurality of cavities 40, 62, 54, and one or more cavities 40, 62 have serpentine cooling circuits, respectively. Cooling medium is drawn from one of passages 20, 30, 22 of the airfoil cooling circuits and returned to other passages 24, 34 of the airfoil circuit or to an outlet 36 at the rear end while flowing in the platform cooling circuits. In this way, the platform cooling circuits give convection cooling to both high and low pressure sides of the platform. COPYRIGHT: (C)2006,JPO&NCIPI
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