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Effectofmean flow shear on sound propagation in uniform circular ducts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-5913-5431
2016 (English)In: ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, 2016Conference paper, Published paper (Refereed)
Abstract [en]

Acoustic measurements based on multi-port models are commonly applied to investigate generation or scattering behaviors of in-duct components (turbocharger, mufflers, etc.) in confined flows. These multi-port models usually require information about the sound attenuations and the mode shapes of the cut-on higher-order acoustic modes in the rigid-wall duct. Although there are well-established models for determining theses parameters, most of the models are based on a uniform-flow assumption which neglects the refraction effects of the mean flow shear on the sound propagation. To understand the importance of the refraction effects, a numerical investigation is conducted to study the influence of the transverse mean-velocity gradients on the viscothermal damping and mode shapes of both the fundamental and higher-order modes in uniform circular ducts with rigid walls. The investigation is based on the linearized Navier-Stokes equations (LNSE) formulated in the frequency domain and several prescribed shear mean-velocity profiles (one turbulent boundary layer profile and two exponential-then-uniform profiles). The numerical results are compared with a model based on the uniform-flow assumption.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Acoustic wave propagation, Boundary layer flow, Boundary layers, Ducts, Frequency domain analysis, Navier Stokes equations, Refraction, Acoustic measurements, Higher-order modes, Linearized navier-stokes equations, Mean velocity profiles, Numerical investigations, Refraction effects, Turbulent boundary layers, Viscothermal damping, Shear flow
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-194593Scopus ID: 2-s2.0-84987876625ISBN: 9789609922623 (print)OAI: oai:DiVA.org:kth-194593DiVA, id: diva2:1044154
Conference
23rd International Congress on Sound and Vibration, ICSV 2016, 10 July 2016 through 14 July 2016
Note

Conference Paper. QC 20161102

Available from: 2016-11-02 Created: 2016-10-31 Last updated: 2017-06-28Bibliographically approved

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Boij, SusannHanifi, Ardeshir

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