Acoustic treatment device for turbine and combustion noises

Details Acoustic treatment device for turbine and combustion noises Acoustic treatment device for turbine and combustion noises

2008-01-30

2011-10-18

Phillips, Forrest M (Department: 2832)

Acoustics

Sound-modifying means

Sound absorbing panels

C181S213000, C244S00100R

Reexamination Certificate

active

08037967

ABSTRACT:
An acoustic treatment device for an internal primary ejection duct from a turbojet pod, including an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream and downstream zones being located on each side of a separating wall with a first face on the side of the upstream side and a second face on the side of the downstream side. The separating wall is a micro-porous wall and the face of the separating wall located on the side of the downstream side is covered by a honeycomb structure to attenuate high frequency acoustic waves. Such a device may find application to treatment of combustion and turbine noises.

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Jia Yu, et al., “Folding Cavity Acoustic Liner for Combustion Noise Reduction”, 12thAIAA/CEAS Aeroacustics Conference, May 8-10, 2006, XP002450867, pp. 1-10.

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