초록 ▼

In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in

In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.

대표청구항 ▼

1. A turbine comprising:a rotor having an axis and including a plurality of turbine wheels and spacers disposed alternately between the wheels, said wheels and spacers defining cavities therebetween, said turbine wheels mounting buckets for disposition in a hot gas path of the turbine, said wheels a

1. A turbine comprising:a rotor having an axis and including a plurality of turbine wheels and spacers disposed alternately between the wheels, said wheels and spacers defining cavities therebetween, said turbine wheels mounting buckets for disposition in a hot gas path of the turbine, said wheels and spacers being secured to one another and defining a passage along the axis of the rotor for receiving compressor discharge air in communication with said cavities, said wheels and spacers having axially and circumferentially extending radially confronting flanges forming a rabbeted joint therebetween; a first set of a plurality of circumferentially spaced slots carried by said wheel flanges and a second set of a plurality of circumferentially spaced slots carried by said spacer flanges, each said wheel and said spacer in axial confronting relation with one another being rotationally aligned to enable the flow of the compressor discharge air from said cavities through said aligned slots into said hot gas stream; and closed circuit cooling steam passages along a rim of the rotor and into said buckets for steam cooling the buckets.