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Optimization of Compact Non-Fibrous Silencer for the Control of Compressor Noise
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7898-8643
2016 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2016-June, no JuneArticle in journal (Refereed) Published
Abstract [en]

The concept of IC engine downsizing is a well-adapted industry standard, enabling better fuel conversion efficiency and the reduction of tailpipe emissions. This is achieved by utilizing different type of superchargers. As a consequence, the additional charger noise emission, at the IC engine inlet, can become a problem. In order to address such problem, the authors of this work have recently proposed a novel dissipative silencer for effective and robust noise control of the compressor. Essentially, it realizes an optimal flow channel impedance, referred to as the Cremer impedance. This is achieved by means of a straight flow channel with a locally reacting wall consisting of air cavities covered by an acoustic resistance, e.g., a micro-perforated panel (MPP). In this paper, an improved optimization method of this silencer is presented. The classical Cremer impedance model is modified to account for mean flow dependence of the optimal wave number. This modified model leads to significantly different impedance values compared to the classical model and consequently, the high damping of the classical model (hundreds of dB/m) is further increased. Moreover, the modeling herein, is performed by solving the convective wave equation, vital for accounting mean flow effects. The presented model is finally validated by experimental results included in the paper.

Place, publisher, year, edition, pages
2016. Vol. 2016-June, no June
Keyword [en]
Channel flow, Engines, Integrated circuits, Internal combustion engines, Acoustic resistance, Compressor noise, Fuel conversion efficiencies, Impedance modeling, Industry standards, Micro-perforated panels, Optimization method, Tailpipe emission, Acoustic impedance
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-197224DOI: 10.4271/2016-01-1818ScopusID: 2-s2.0-84978160935OAI: oai:DiVA.org:kth-197224DiVA: diva2:1052064
Conference
9th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, ISNVH 2016, 22 June 2016 through 24 June 2016
Note

QC 20161205

Available from: 2016-12-05 Created: 2016-11-30 Last updated: 2017-03-28Bibliographically approved

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Kabral, RaimoDu, LinÅbom, Mats
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