Diesel engines after treatment devices: Acoustic modeling
2005 (English)In: 12th International Congress on Sound and Vibration 2005: ICSV 2005, 2005, 2358-2365 p.Conference paper (Refereed)
To reduce exhaust pollutants from diesel engines a Diesel Particulate Filter (DPF) is normally fixed after a Catalytic Converter (CC) in an expansion chamber to create a complete After-Treatment Device (ATD). As part of the work in the EC-project ARTEMIS the authors have published a series of papers on the modeling of DPF units. Here the final and complete DPF model is presented. The model calculates the acoustic 2-port by solving the convective acoustic wave equations for two neighboring cells simplified in the manner of the Zwikker and Kosten theory. A segmentation approach has been employed to handle the actual flow, density, pressure, and temperature distribution inside the monoliths at each frequency. The theoretical results were compared with measured transmission loss data at different flow speeds and the agreement is excellent. The new complete model has also been compared with the 1-D model earlier suggested by the authors. It turns out that by using a wave number based on the Kirchhoff solution for plane waves in narrow pipes, the simple 1-D model works almost as well as the complete model. Another conclusion is that the effect of mean flow on the sound transmission through a filter is very small. Using the new model and existing models for standard pipe elements and the CC, the acoustic 2-port for a car ATD unit has been calculated and used to predict the transmission loss. The agreement between the predictions and the measured data for various flow speeds is good.
Place, publisher, year, edition, pages
2005. 2358-2365 p.
, 12th International Congress on Sound and Vibration 2005, Vol. 3
IdentifiersURN: urn:nbn:se:kth:diva-148559ScopusID: 2-s2.0-84881585096ISBN: 978-162748149-6OAI: oai:DiVA.org:kth-148559DiVA: diva2:737098
12th International Congress on Sound and Vibration 2005, ICSV 2005; Lisbon, Portugal, 11-14 July, 2005
QC 201408112014-08-112014-08-082014-08-11Bibliographically approved