Method and apparatus for use in control and compensation of clea

Details Method and apparatus for use in control and compensation of clea Method and apparatus for use in control and compensation of clea

1998-12-23

2000-12-05

Freay, Charles C.

Power plants

Combustion products used as motive fluid

415 17, 415 26, 415 30, 415 33, 415 47, 415 48, 36443101, 364 4302, F02C 1310

Patent

active

061550388

ABSTRACT:
A method and an apparatus for use with a gas turbine engine receive a signal indicative of an engine operating condition, generate signals representative of thermal conditions of a rotor, blades, and a case, and in response to each of the signals above, determine a signal indicative of a difference between a instantaneous clearance for the thermal conditions and a steady state clearance for the engine operating condition. The determination includes effects related to a temporary difference that results from a difference between the steady state clearance for the engine operating condition and a steady state clearance for a preceding engine operating condition, but does not require computation of the actual temperatures or the steady state temperatures of the rotor, the blades, and the case. A signal indicative of the difference between a instantaneous clearance for the thermal conditions and a steady state clearance for the engine operating condition may be provided to various augmentation schedules.

REFERENCES:
patent: 3614253 (1971-10-01), Gaertner
patent: 4338061 (1982-07-01), Beitler et al.
patent: 4849895 (1989-07-01), Kervistin
patent: 4958289 (1990-09-01), Sum et al.
patent: 4995786 (1991-02-01), Wheeler et al.
patent: 5012420 (1991-04-01), Walker et al.
patent: 5165844 (1992-11-01), Khalid
patent: 5165845 (1992-11-01), Khalid

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