Jet engine noise suppressor
AssigneeThe Regents of the University of California
InventorDimitri Papamoschou
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Abstract
An embodiment of the invention is a technique to suppress noise in a jet engine. A substantially annular fan nozzle is attached to a pylon and discharges a fan stream into atmosphere from an aft end thereof. A core nozzle discharges core stream into the atmosphere. The core nozzle has an exterior surface. A stream director is mounted on the pylon to direct the fan stream away from the pylon. At least a portion of the stream director is situated outside the aft end to maintain substantially constant flow area of the fan nozzle.
Claims45
A turbofan exhaust system comprising:
- a substantially annular fan nozzle attached to a pylon and discharging fan stream into atmosphere from an aft end thereof;
- a core nozzle to discharge core stream into the atmosphere, the core nozzle having an exterior surface;
- and
- a stream director mounted on the pylon substantially external to the fan nozzle directing the fan stream away from the pylon, at least a portion of the stream director situated outside the aft end to maintain substantially constant flow area of the fan nozzle.
A method comprising:
- discharging fan stream into atmosphere from an aft end of a substantially annular fan nozzle attached to a pylon;
- discharging core stream into the atmosphere from a core nozzle having an exterior surface;
- and
- directing the fan stream away from the pylon by a stream director mounted on the pylon substantially external to the fan nozzle, at least a portion of the stream director being situated outside the aft end to maintain substantially constant flow area of the fan nozzle.
A system comprising:
- a pylon;
- a jet engine attached to the pylon, comprising:
- a substantially annular fan nozzle to discharge fan stream into atmosphere from an aft end thereof;
- and
- a core nozzle to discharge core stream into the atmosphere, the core nozzle having an exterior surface, and
- a stream director mounted on the pylon substantially external to the fan nozzle directing the fan stream away from the pylon, at least a portion of the stream director situated outside the aft end to maintain substantially constant flow area of the fan nozzle.
Dependencies are inferred from the claim text.