Synthesized feedback for gas turbine clearance control

Details Synthesized feedback for gas turbine clearance control Synthesized feedback for gas turbine clearance control

1989-10-12

1991-03-19

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 3924, 60 3975, 415178, F02C 718

Patent

active

049999915

ABSTRACT:
A method for controlling radial clearance in a gas turbine engine (10) uses a mathematical algorithm to synthesize the current clearance .delta., including the transient effects of prior engine operations. The synthesized clearance is compared (202) to a schedule of desired clearance (206) for closing .delta. a cooling air modulating valve (44) as required to avoid rubbing between the rotating blade tips and surrounding shroud.

REFERENCES:
patent: 4019320 (1977-04-01), Redinger, Jr. et al.
patent: 4069662 (1978-01-01), Redinger et al.
patent: 4242042 (1980-12-01), Schwarz
patent: 4304093 (1981-12-01), Schulze
patent: 4329114 (1982-05-01), Johnston et al.
patent: 4487016 (1984-12-01), Schwarz et al.
patent: 4849895 (1989-07-01), Kervistin

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