Jet exhaust noise reduction system and method

Details Jet exhaust noise reduction system and method Jet exhaust noise reduction system and method

2006-10-03

2006-10-03

Rodriguez, William H. (Department: 3746)

Power plants

Reaction motor

Method of operation

C060S770000, C060S262000, C060S725000, C239S265190, C181S213000

Reexamination Certificate

active

07114323

ABSTRACT:
A system for reducing jet noise emission from an internally mixed gas turbine engine exhaust, comprising a fan/core flow mixer having a plurality of mixer lobes and a common flow nozzle having an equal number of tabs located along a circumferential edge of an aft end of the nozzle. There is a predetermined clocking relationship between the plurality of mixer lobes and the plurality of nozzle tabs that results in reduced exhaust noise emission, most evident in the lower frequency range. A method for reducing jet noise emission from an internally mixed gas turbine engine exhaust comprises selectively aligning a circumferential distribution of a mixed flow vorticity field produced by a fan/core mixer with a circumferentially distributed exhaust flow vorticity field produced by a modified common flow nozzle at an exit plane of the engine exhaust.

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