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The influence of higher order incident modes on the performance of a hybrid reactive-dissipative splitter silencer
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2017 (English)In: Proceedings of Meetings on Acoustics, Acoustical Society of America , 2017, no 1Conference paper, Published paper (Refereed)
Abstract [en]

A hybrid reactive-dissipative splitter silencer offers the potential to attenuate turbomachinery noise over a wide frequency range, including the problematic low to medium frequencies. This article uses a theoretical model to investigate the performance of a hybrid parallel baffle silencer for different complex incident sound fields. This includes an incident sound field with equal modal energy density, as well as the excitation of individual higher order modes. It is shown that provided horizontal and vertical partitions are used in the reactive element, the sound attenuation performance of the reactive chamber under complex incident sound fields is equivalent to that obtained using plane wave excitation over the frequency range of interest. Furthermore, it is demonstrated that the reactive elements work at frequencies above the first cut-on mode in the inlet duct, and so they are capable of extending sound attenuation into the low to medium frequency range. This delivers an efficient hybrid silencer design that is suitable for use in power generation applications, such as gas turbine exhaust systems. 

Place, publisher, year, edition, pages
Acoustical Society of America , 2017. no 1
Keywords [en]
Acoustic field measurement, Gas turbines, Dissipative splitter silencers, Gas turbine exhausts, Medium frequencies, Medium-frequency range, Plane wave excitation, Power generation applications, Theoretical modeling, Wide frequency range, Acoustic fields
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-236780DOI: 10.1121/2.0000636Scopus ID: 2-s2.0-85049443577OAI: oai:DiVA.org:kth-236780DiVA, id: diva2:1277147
Conference
173rd Meeting of Acoustical Society of America, Acoustics 2017 and 8th Forum Acusticum, 25 June 2017 through 29 June 2017
Note

QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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Åbom, Mats

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  • apa
  • ieee
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