| 摘要 |
PROBLEM TO BE SOLVED: To provide a robust turbine rotor that can restrain against not only increase in thermal stress but also against excessive local concentration of stress. SOLUTION: This turbine rotor comprises turbine rotor blades 5 in the periphery and a plurality of wheels 1 with a refrigerant flow hole in the internal portion, and has a structure, where the wheels are axially superposed and a refrigerant for cooling the rotor blades, is supplied via the refrigerant flow holes in the wheels. The refrigerant flow holes are provided in the wheel center and periphery, and refrigerants of different systems are made to flow in the central and peripheral refrigerant flow holes. The refrigerant fed through the central refrigerant flow holes is supplied from the upstream side of turbine operating gas, while the refrigerant fed through the peripheral refrigerant flow holes is supplied from the downstream side of the turbine operating gas. The wheel in the downstream end position along the turbine operating gas is left solid, so that the central refrigerant flow holes are insulated from the refrigerant fed through the peripheral refrigerant flow holes.
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