Spillage drag reducing flade engine

Details Spillage drag reducing flade engine Spillage drag reducing flade engine

1993-10-04

1995-04-04

Casaregola, Louis J.

Power plants

Reaction motor

Method of operation

602263, F02K 3075

Patent

active

054026385

ABSTRACT:
A FLADE aircraft gas turbine engine having a FLADE duct circumscribing a preferably variable cycle inner gas turbine engine. A FLADE fan is disposed in the FLADE duct radially outward of and drivenly connected to a first fan disposed in a first fan duct of the engine. The inlet of the first fan duct is sized to receive essentially the full mass airflow of the engine at full power conditions with the FLADE duct inlet essentially closed off. The engine is further designed and operable to fully open the inlet of the flade duct at predetermined part power flight conditions to avoid spillage drag and essentially close it at full power conditions such as take off. Another embodiment relates to a supersonic engine which operates the FLADE fan fully open at supersonic cruise flight conditions and has a FLADE duct inlet which is sized essentially sufficiently large enough to receive essentially only the engine inlet boundary layer flow and pass it though the FLADE duct and not through the inner engine where it would decrease the inner engine efficiency.

REFERENCES:
patent: 3449914 (1969-06-01), Brown
patent: 4043121 (1977-08-01), Thomas et al.
patent: 4791783 (1988-12-01), Neitzel

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