Simulation of the particle oxidation catalyst POC (R) acoustics
2014 (English)In: Noise Control Engineering Journal, ISSN 0736-2501, E-ISSN 2168-8710, Vol. 62, no 5, 368-374 p.Article in journal (Refereed) Published
The reduction of the exhaust noise from internal combustion engine (IC-engine) is mainly managed by proper silencer design, while less attention is paid to the acoustic performance of the after treatment devices (ATD). It is known from the earlier studies, that the transmission loss of a typical ATD unit can be quite significant. An ATD unit for diesel engines is classically assembled from several specific parts 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 (POC (R)). 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. In this paper acoustic two-port simulation models for POC-X are proposed. First model is built up starting from the classical Kirchhoff solution for prediction of the acoustic wave attenuation in narrow channels. According to experimental studies, correction factors to the narrow channel two-port model are proposed. Second model is derived by treating the filter as a lumped acoustic resistance, dependent on the flow resistivity coefficients obtained from the pressure drop measurements.
Place, publisher, year, edition, pages
2014. Vol. 62, no 5, 368-374 p.
Acoustics, Catalysts, Catalytic oxidation, Diesel engines, Engines, Oxidation, Pressure drop, Acoustic performance, Acoustic resistance, After treatment devices, Cylindrical shapes, Diesel oxidation catalyst, Diesel particulate filters, Oxidation catalysts, Pressure drop measurements
Other Engineering and Technologies
IdentifiersURN: urn:nbn:se:kth:diva-158456DOI: 10.3397/1/376236ISI: 000346128200009ScopusID: 2-s2.0-84912530026OAI: oai:DiVA.org:kth-158456DiVA: diva2:776959
QC 201501082015-01-082015-01-082015-12-14Bibliographically approved