Patent ID: 6375118
Filing Date: 2002-04-23
Classification: F02K,F05D,Y02T

Abstract:
An apparatus for reducing noise from a jet engine exhaust, comprising:an airflow directing system disposed adjacent a trailing edge of an exhaust nozzle of a jet engine; said airflow directing system forming a plurality of distinct chamber-like resonance elements disposed at least partially circumferentially about said exhaust nozzle, each of said resonance elements having an inlet port in communication with an interior area thereof; an outlet associated with each said resonance element for permitting airflow from said interior area of each of said resonant elements outwardly therefrom; wherein a pressurized airflow entering said inlet port of each said resonance element causes an oscillating excitation airstream to flow from said interior area of each said chamber out through said outlet and into a developing shear layer of airflow exiting from said exhaust nozzle; and whereby said oscillating excitation airstream induces modifications into said shear layer to thus reduce noise and buffeting generated by said shear layer.