Active clearance control

Details Active clearance control Active clearance control

1983-11-03

1987-03-10

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

415115, F02C 718

Patent

active

046482415

ABSTRACT:
Active clearance control is effectuated by heating the bore of the high pressure compressor spool so as to expand the compressor disc and labyrinth seals to minimize the gap between the blades and its peripheral seal and labyrinth seal. The high stages of the high spool compressor are selectively bled to achieve the desired gap control over the engine's operating envelope. The bled air is fed into the bore by conducting the air externally of the engine's case and admitting it through hollow stator vanes of the low pressure spool and tubes communicating with a cavity at the bearing supporting the high pressure compressor shaft at a juncture in line with the inlet of the high pressure compressor spool.

REFERENCES:
patent: 2837270 (1958-06-01), Chapman
patent: 2848156 (1958-08-01), Oppenheimer
patent: 3031132 (1962-04-01), Davies
patent: 3647313 (1972-03-01), Koff
patent: 3742706 (1973-07-01), Klompas
patent: 3844110 (1974-10-01), Widlansky et al.
patent: 3945759 (1976-03-01), Bobo
patent: 4127988 (1978-12-01), Becker
patent: 4230436 (1980-10-01), Davison
patent: 4268221 (1981-05-01), Monstrrat et al.
patent: 4329114 (1982-05-01), Johnston et al.

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