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A study of the viscous effects over an acoustic liner using the linearised Navier-Stokes equations in the frequency domain
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
2017 (English)In: 23rd AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Noise regulations for civil aviation restrict the sound level that engines can emit to a great extent. Acoustic liners are the most widespread solution in order to damp sound in aircraft engines. Usually the linearised Euler equations (LEE) are used to calculate the sound propagation through the engine and the near wall effects introduced by the presence of the boundary layer are accounted by the Myers boundary condition. Nonetheless, this boundary condition has been proved to be ill-posed and to generate numerical instabilities, and thus, the boundary layer is not being properly described by this model. Hence, in this paper a different approach is taken by using the linearised Navier-Stokes equations and avoiding the Myers boundary condition since a viscous solution is adopted. The RANS equation and a frequency domain are used to calculate the flow and the acoustic fields respectively, in an attempt to reduce the high computational cost associated with this type of simulation. In order to assess the validity of this method a computational study is developed and the results are then compared to a benchmark case. Good agreement with the benchmark data is found, therefore showing the validity of this methodology. 

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2017.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-197672DOI: 10.2514/6.2017-3373Scopus ID: 2-s2.0-85023629936ISBN: 9781624105043 (print)OAI: oai:DiVA.org:kth-197672DiVA: diva2:1052589
Conference
23rd AIAA/CEAS Aeroacoustics Conference, 2017, Denver, United States, 5 June 2017 through 9 June 2017
Note

QC 20161208

Available from: 2016-12-07 Created: 2016-12-07 Last updated: 2017-09-18Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
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  • asciidoc
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