Acoustic modeling of a Diesel Particulate Filter using a double equivalent fluid homogenization approach
* Presenting author
In order to comply with more and more stringent engine particulate emission regulates, Diesel Particulate Filters (DPF) are used to filter polluting particulate and reduce pollutants in the exhaust gas of a car. These devices have a noticeable impact on the acoustic behavior of the exhaust line. It is therefore of interest to study their effect through numerical simulations. In order to account for the effect of the DPF in a finite element acoustic simulation model, a double equivalent fluid homogenization is presented in this paper. It consists of two sets of duct arrays modeled with an anisotropic equivalent fluid model and coupled with local exchange admittance. This model accounts for visco-thermal dissipation in the ducts and the acoustic transmission between the two sets of duct arrays in presence of a mean flow. In the present paper, the Double Visco-Thermal Array (DVTA) model is presented and then applied to a realistic case for which measurement results are available. The acoustic transmission loss of the DPF included in a housing is computed and compared to other modeling techniques and experimental results.