Power plants – Reaction motor – Air passage bypasses combustion chamber
Patent
1996-10-11
1998-06-09
Freay, Charles G.
Power plants
Reaction motor
Air passage bypasses combustion chamber
602262, 60277, 23926517, 23926537, F02K 138, F02K 302
Patent
active
057619000
ABSTRACT:
A two-stage mixer ejector concept ("TSMEC") is disclosed for suppressing the noise emanated by jet aircraft. This TSMEC was designed to help older engines meet the stringent new federal noise regulations, known as "Stage III". In an illustrated embodiment, the TSMEC comprises: a lobed engine nozzle attached to the rear of a turbofan engine; a short shroud that straddles the exit end of the engine nozzle; two rings of convergent/divergent primary and secondary lobes within the engine nozzle shroud and; and a ring of arcuate gaps that precede the shroud and the second nozzle ring. The lobes are complimentary shaped to rapidly mix the turbine's hot exhaust flow with cooler air including entrained ambient air, at supersonic speed. This drastically reduces the jet exhaust's velocity and increases jet mixing, thereby reducing the jet noise.
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Freay Charles G.
Holland, Esq. Donald S.
Stage III Technologies, L.C.
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