Fixed geometry mixer/ejector suppression system for turbofan aircraft engines
AssigneesUnited Technologies Corporation, Nordam
InventorsDelbert W. Torkelson, Thomas J. Jannetta, John P. Nikkanen, Daniel E. Webb, Steven H. Zysman, William D. Colletti, Alfred M. Stern, Wesley K. Lord
Life of this patent
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Abstract
An internal flow mixer is attached to the rearward end of a turbofan engine for inverting the engine fan and core streams. Rearwardly of the internal flow mixer is a multi-lobed exhaust nozzle which mixes ambient air with the gases flowing from the flow mixer. An ejector housing lined with acoustic absorption material receives the flow from the exhaust nozzle and discharges the thrust producing gases in noise abatement condition.
Claims11
A noise suppression system for use with a turbofan engine having, at its exhaust end, fan flow and core flow streams, the suppression system comprising:
- a flow mixer having an aft end and formed of a selected number of fixed wave-like lobes and attached to said exhaust end of said turbofan engine and configured to invert said fan flow and said core flow streams to provide a flow mixer outlet stream,
- an exhaust nozzle having a forward end and being formed of a selected number of fixed wave-like lobes supported aft of said flow mixer including means for the introduction of ambient air that is mixed with said flow mixer outlet stream, said exhaust nozzle forward end being forward of said flow mixer aft end so that said flow mixer is contained at least in part within said exhaust nozzle;
- and
- an exhaust shroud supported at least in part aft of said exhaust nozzle, said engine, said flow mixer, said exhaust nozzle and said exhaust shroud being arranged in sequential and at least substantially inline relationship.
A fixed geometry noise suppression system for use with a turbofan engine having at its exhaust end, fan flow and core flow streams which comprises:
- a flow mixer having fixed wave-like lobes, the flow mixer being attached to said engine exhaust end and arranged to, at least in part, invert said engine fan flow and core flow streams to provide a flow mixer stream;
- an exhaust nozzle having fixed wave-like lobes, the exhaust nozzle being supported by said engine and spaced in overlapping telescopic relationship with said lobed flow mixer, the lobes of said exhaust nozzle being aligned with corresponding lobes of said flow mixer;
- and
- an ambient air inlet at a forward end of said exhaust nozzle such that ambient air is mixed by said exhaust nozzle with said flow mixer stream.
Dependencies are inferred from the claim text.