Time-domain calculation of sound propagation in lined ducts with sheared flows

Yusuf Özyörük, Lyle N. Long

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

9 Scopus citations

Abstract

A recent application of the time-domain equivalent of the classical acoustic impedance condition, i.e. the particle displacement continuity equation, to the numerical simulations of a flow-impedance tube in the time domain yielded reasonably good results with uniform mean flows. The present paper extends this application to include sheared mean flow effects on sound propagation over acoustically treated walls. To assess the prediction improvements with sheared flows, especially at relatively high Mach numbers, numerical simulations of the NASA Langley flow-impedance tube are carried out at actual conditions. Calculations are realized for mean flow peak velocities as high as Mach 0.5 at various frequencies. Results are compared with those obtained with uniform mean flows and experimental data. It is shown that solutions which were not attainable previously with uniform flows at high Mach numbers can now be obtained without any problems with the use of sheared background flows.

Original languageEnglish (US)
Title of host publication5th AIAA/CEAS Aeroacoustics Conference and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9780000000002
StatePublished - Jan 1 1999
EventAeroacoustics Conference and Exhibit, AIAA/CEAS 1999 - Bellevue, United States
Duration: May 10 1999May 12 1999

Publication series

Name5th AIAA/CEAS Aeroacoustics Conference and Exhibit

Other

OtherAeroacoustics Conference and Exhibit, AIAA/CEAS 1999
CountryUnited States
CityBellevue
Period5/10/995/12/99

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Özyörük, Y., & Long, L. N. (1999). Time-domain calculation of sound propagation in lined ducts with sheared flows. In 5th AIAA/CEAS Aeroacoustics Conference and Exhibit [AIAA 99-1817] (5th AIAA/CEAS Aeroacoustics Conference and Exhibit). American Institute of Aeronautics and Astronautics Inc, AIAA.