Gas turbine engine with bleed air buffer seal

Details Gas turbine engine with bleed air buffer seal Gas turbine engine with bleed air buffer seal

1995-05-09

1997-04-15

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 3907, 60 3983, F02C 718

Patent

active

056198507

ABSTRACT:
A bleed air buffer seal arrangement is provided for improved buffer sealing of oil sump seals in a gas turbine engine. In a multiple spool gas turbine engine, bleed air for buffer sealing is obtained through an annular bleed slot or annular array of bleed ports formed in the impeller shroud of a high pressure centrifugal impeller at a location spaced aft or downstream from the leading edge thereof. Bleed air from this location exhibits significant pressure at low engine power conditions to provide satisfactory buffer sealing, without subjecting sump seals to excess pressure or temperature at high engine power conditions.

REFERENCES:
patent: 2648493 (1953-08-01), Stalker
patent: 3133693 (1964-05-01), Holl
patent: 3581504 (1971-06-01), Andrus
patent: 4653267 (1987-03-01), Brodell et al.
patent: 4709545 (1987-12-01), Stevens et al.
patent: 4815272 (1989-03-01), Laurello et al.
patent: 5235803 (1993-08-01), Rodgers
patent: 5485717 (1996-01-01), Williams

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