| 摘要 |
PROBLEM TO BE SOLVED: To provide a serpentine cooling passage inside blades to effectively cool the blades with steam and recover the steam after cooling, and to improve efficiency, in relation to a cooling blade of a gas turbine. SOLUTION: The serpentine cooling passage comprising cooling passage 5a-5h is disposed in a stationary blade 10, the steam of about 300 deg.C is guided through a steam inlet 3 to cool the blade, the steam flows out of a steam outlet 4, the steam heated to about 600 deg.C is recovered to use effectively. Part of the steam after cooling flows to an external gas passage through many blowing holes 6 at the rear edge, heats a blowing medium on the rear edge side, and improves an aerodynamic characteristic on the rear edge of the blade. In a moving blade 20, similarly the steam is allowed to flow to cooling passage 14a-14h through a steam inlet 12, and is recovered from a steam outlet 13, or is blown off through blowing holes 15 at the rear edge, to obtain the effect similar to the stationary blade.
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