Apparatus and method for reducing thermal stress in a turbine ro

Details Apparatus and method for reducing thermal stress in a turbine ro Apparatus and method for reducing thermal stress in a turbine ro

1977-03-04

1978-10-03

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Different fluids

415115, 415116, F02C 726, F01B 518

Patent

active

041176693

ABSTRACT:
A gas turbine is provided wherein the thermal stresses in the turbine rotor are reduced. The rotor includes a central disc with a peripheral rim, and a plurality of blades extending radially outwardly from the rim, and to reduce thermal stresses, a duct arrangement is provided which selectively directs hot gases from the turbine combustor to the rim during the turbine start-up. The hot gases from the combustor serve to heat the rim, and thus decease the start-up period necessary to bring the temperature profile of the rotor into the operating temperature range. After the start-up period, the duct arrangement is then used to direct cool gases from the turbine compressor to the rim of the rotor in order to maintain a lower rotor equilibrium temperature.

REFERENCES:
patent: 1164091 (1915-12-01), Herz
patent: 2685421 (1945-08-01), Klose
patent: 2977760 (1961-04-01), Soltav et al.
patent: 3267676 (1966-08-01), Sneeden
patent: 3316714 (1967-05-01), Smith et al.
patent: 3446481 (1969-05-01), Kydd
patent: 3975901 (1976-08-01), Hollinger et al.

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