PURPOSE: To recover cooling water so effectively for reusing by installing a filling pipe, spraying the cooling water as water droplets, and a return pipe inhaling cooling water vapor generated by heat absorption both in a blade with small holes scattered, and setting up a connecting passage for these pipes and a turbine jacket.

CONSTITUTION: When cooling water in a tank 15 is fed to a conduit 19, under pressure, by a pump 16, it enters a filling pipe 11 by way of a coupling 20 and a passage 21, and is spouted spraylike out of each small hole 12, cooling a blade, and a part of it flows out of each small hole 7 of the blade. The cooling water remaining in the blade turns into superheated steam and it is taken to the outside of a gas turbine from a conduit 24 by way of a return pipe 22, a passage 23 and the coupling 20. Since the cooling water recovered from the gas turbine is turned to high pressure steam, this steam is guided to a steam turbine 28, thereby generating its power. With this constitution, heat absorbed out of the blade by the cooling water is thus recoverable as power.