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A frequency domain linearized Navier-Stokes equations approach to acoustic propagation in flow ducts with sharp edges
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aeroacoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9061-4174
2010 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 127, no 2, 710-719 p.Article in journal (Refereed) Published
Abstract [en]

Acoustic wave propagation in flow ducts is commonly modeled with time-domain non-linear Navier-Stokes equation methodologies. To reduce computational effort, investigations of a linearized approach in frequency domain are carried out. Calculations of sound wave propagation in a straight duct are presented with an orifice plate and a mean flow present. Results of transmission and reflections at the orifice are presented on a two-port scattering matrix form and are compared to measurements with good agreement. The wave propagation is modeled with a frequency domain linearized Navier-Stokes equation methodology. This methodology is found to be efficient for cases where the acoustic field does not alter the mean flow field, i.e., when whistling does not occur.

Place, publisher, year, edition, pages
2010. Vol. 127, no 2, 710-719 p.
Keyword [en]
acoustic wave propagation, aeroacoustics, Navier-Stokes equations, orifices (mechanical), pipe flow, finite-element method, low-mach-number, sound-absorption, 4-pole, parameters, bias flow, orifice, expansions, scattering, matrix, slit
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-19184DOI: 10.1121/1.3273899ISI: 000274322200022Scopus ID: 2-s2.0-76349094069OAI: oai:DiVA.org:kth-19184DiVA: diva2:337231
Note

QC 20150727

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Frequency Domain Linearized Navier-Stokes Equations Methods for Low Mach Number Internal Aeroacoustics
Open this publication in new window or tab >>Frequency Domain Linearized Navier-Stokes Equations Methods for Low Mach Number Internal Aeroacoustics
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Traffic is a major source of environmental noise in modern day's society. As a result, the development of new vehicles are subject to heavy governmental legislations. The major noise sources on common road vehicles are engine noise, transmission noise, tire noise and, at high speeds, wind noise. One way to reduce intake and exhaust noise is to attach mufflers to the exhaust pipes. However, to develop prototypes for the evaluation of muffler performance is a costly and time-consuming process. As a consequence, in recent years so called virtual prototyping has emerged as an alternative. Current industrial simulation methodologies are often rather crude, normally only including one-dimensional mean flows and one-dimensional acoustic fields. Also, flow generated noise is rudimentary modeled or not included at all. Hence, improved methods are needed to fully benefit from the possibilities of virtual prototyping.

This thesis is aimed at the development of simulation methodologies suitable both as industrial tools for the prediction of the acoustic performance of flow duct systems, as well as for analyzing the governing mechanisms of duct aeroacoustics. Special focus has been at investigating the possibilities to use frequency-domain linearized Navier-Stokes equations solvers, where the equations are solved either directly or as eigenvalue formulations.

A frequency-domain linearized Navier-Stokes equations methodology has been developed to simulate sound propagation and acoustic scattering in flow duct systems. The performance of the method has been validated to experimental data and analytical solutions for several cases of in-duct area expansions and orifice plates at different flow speeds. Good agreement has generally been found, suggesting that the proposed methodology is suitable for analyzing internal aeroacoustics.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. vii, 78 p.
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-33763 (URN)978-91-7501-008-3 (ISBN)
Public defence
2011-05-27, Sal E3, Osquars backe 14, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish e‐Science Research CenterTrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20110517Available from: 2011-05-17 Created: 2011-05-16 Last updated: 2012-06-12Bibliographically approved

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Boij, SusannEfraimsson, Gunilla

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Marcus Wallenberg Laboratory MWLVinnExcellence Center for ECO2 Vehicle designAeroacousticsLinné Flow Center, FLOW
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Journal of the Acoustical Society of America
Fluid Mechanics and Acoustics

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