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EFFECT OF MEAN FLOWSHEAR ON SOUND PROPAGATION IN UNIFORM CIRCULAR DUCTS
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2016 (English)In: PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS, 2016Conference 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.
Series
Proceedings of the International Congress on Sound and Vibration, ISSN 2329-3675
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-203207ISI: 000388480403128ISBN: 978-960-99226-2-3 OAI: oai:DiVA.org:kth-203207DiVA: diva2:1081238
Conference
23rd International Congress on Sound and Vibration (ICSV), JUL 10-14, 2016, Athens, GREECE
Note

QC 20170313

Available from: 2017-03-13 Created: 2017-03-13 Last updated: 2017-03-13Bibliographically approved

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