Impedance predictions of 3D honeycomb liner with circular apertures by DNS

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Acoustic liners play an important role in aircraft gas turbine engine noise reduction by converting acoustic fluctuations into nonradiating vortical disturbances through small openings, or apertures. In recent years, numerical investigations of acoustic liners have become useful. In this paper, we use direct numerical simulations to investigate the unsteady flow induced by sound normally incident on a comprised of a circular aperture with a hexagonal backing cavity. A series of simulations were performed by varying both the intensity and frequency of the incident sound. Through the numerical simulation data, a detailed flow visualization and quantification of the acoustic energy dissipation at different sound pressure levels and frequencies are presented. Impedance values were predicted using the traditional two microphone method. We also develop a time domain model to predict the impedance values predicted by DNS data. The reduced-order model takes several factors into account that may influence the liner impedance and provides a reasonable match up to 150 dB. Several candidates for improved predictions are proposed and evaluated.

Original languageEnglish (US)
Title of host publication17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference)
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600869433
DOIs
StatePublished - 2011
Externally publishedYes
Event17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference) - Portland, OR, United States
Duration: Jun 5 2011Jun 8 2011

Publication series

Name17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference)

Conference

Conference17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference)
Country/TerritoryUnited States
CityPortland, OR
Period6/5/116/8/11

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

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