Method of restoring exhaust gas temperature margin in a gas turb

Details Method of restoring exhaust gas temperature margin in a gas turb Method of restoring exhaust gas temperature margin in a gas turb

1990-05-25

1992-01-21

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 3975, F02C 712

Patent

active

050818309

ABSTRACT:
The present invention discloses a method of restoring exhaust gas temperature (EGT) margin in a gas turbine engine equipped with a modulating valve and other hardware for shrinking the turbine case relative to the turbine rotors. The method involves increasing the minimum flow area of the modulating valve at all engine operating conditions after the engine experiences some wear and operational deterioration, thereby providing additional cooling flow at take-off and climb conditions to restore both turbine efficiency and EGT margin.

REFERENCES:
patent: 4019320 (1977-04-01), Redinger et al.
patent: 4069662 (1978-01-01), Redinger et al.
patent: 4304093 (1981-12-01), Schulze
patent: 4849895 (1989-07-01), Kervistin
patent: 4856272 (1989-08-01), Putman et al.
patent: 4999991 (1991-03-01), Haddad et al.

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