External gas turbine engine cooling for clearance control

Details External gas turbine engine cooling for clearance control External gas turbine engine cooling for clearance control

1975-12-05

1977-04-26

Croyle, Carlton R.

Power plants

Reaction motor

Interrelated reaction motors

60 3966, 60266, 415116, 415138, F02C 718

Patent

active

040193209

ABSTRACT:
A reduction of the opening of the clearance between the outer air seal secured to the case of a turbo-fan engine and the tip of the turbine buckets is obtained by selectively turning on and off or modulating the cool air supply. The cool air is bled from the fan discharge duct and is directed externally of the engine case adjacent the seal. Circumferentially mounted spray bars are axially spaced to fit juxtaposed to the annular flanges extending from the engine case and carry a plurality of holes judiciously located to direct the flow of cool air to impinge on the side walls of the flanges to effectuate shrinkage of the case.

REFERENCES:
patent: 2811833 (1957-11-01), Broffitt
patent: 2994472 (1961-08-01), Botje
patent: 3141651 (1964-07-01), Moyer
patent: 3295823 (1967-01-01), Waugh et al.
patent: 3575528 (1971-04-01), Beam et al.
patent: 3583824 (1971-06-01), Smuland et al.
patent: 3742705 (1973-07-01), Sifford
patent: 3864056 (1975-02-01), Gabriel et al.
patent: 3869222 (1975-03-01), Rahnke et al.
patent: 3966354 (1976-06-01), Patterson

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