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Procedure to estimate the acoustic performance of the particle oxidation catalyst poc® with low Mach-number flows
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7898-8643
2015 (English)In: INTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering, The Institute of Noise Control Engineering of the USA, Inc. , 2015Conference paper (Refereed)Text
Abstract [en]

The main component for the reduction of the exhaust noise from internal combustion engine (IC-engine) is the properly designed silencer. In addition, the acoustic performance of the after treatment devices (ATD) has gained interest as noise reduction components. Typically an ATD for diesel engines is assembled from components such as selective catalytic reducers (SCR), diesel oxidation catalysts (DOC) and diesel particulate filters (DPF). One new alternative to the conventional DPF is the particle oxidation catalyst (POCR ). The POC R substrate studied in this paper is of type POC-X, which consists of fine, corrugated metallic wire mesh screens piled askew and rolled into a cylindrical shape. According to earlier studies the acoustic behaviour of the filter with negligible flow can be estimated with reasonable accuracy starting from the Kirchhoff solution. It was also concluded earlier that treating the filter as an acoustic resistance gives good results in the plane wave frequency range with moderate Mach-number flow. In this paper, the experiments on the acoustic performance of the POC-X in the non-plane wave frequency range with low Mach-number flow (M = 0.01) are introduced. Starting from the earlier findings, procedure to obtain an estimate for the acoustic performance of the filter in the entire audio frequency range is proposed. Using the computationally effective semi-empirical model presented in this paper is especially reasonable when optimizing the complete exhaust system of an IC-engine for the maximum noise reduction.

Place, publisher, year, edition, pages
The Institute of Noise Control Engineering of the USA, Inc. , 2015.
Keyword [en]
Acoustic noise, Acoustic variables control, Aerodynamics, Catalysts, Catalytic oxidation, Diesel engines, Elastic waves, Engines, Exhaust systems (engine), Internal combustion engines, Mach number, Noise abatement, Oxidation, Wave propagation, Acoustic performance, Acoustic resistance, After treatment devices, Diesel oxidation catalyst, Diesel particulate filters, Low-Mach-number flow, Oxidation catalysts, Semi-empirical modeling, Audio acoustics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-181505ScopusID: 2-s2.0-84947587319OAI: oai:DiVA.org:kth-181505DiVA: diva2:909021
Conference
44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, 9 August 2015 through 12 August 2015
Note

QC 20160304

Available from: 2016-03-04 Created: 2016-02-02 Last updated: 2016-03-04Bibliographically approved

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Åbom, Mats
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