STDF - US-Egypt - Acoustics of Diesel Particulate Filters

A diesel particulate filter or DPF is an after-treatment device used to trap and capture soot from diesel engines. Due to increasingly stringent regulations, diesel particulate filters will be required in Europe and perhaps the United States as early as 2013. Though their primary purpose is to reduce exhaust pollutants, diesel particulate filters are also effective sound attenuation devices in exhaust systems.

For one-dimensional analysis of exhaust systems it is usually assumed that only plane waves can propagate, which limits the frequency range of the simulation. This technique is valid for applications like small automotive mufflers. However, the duct dimensions are large compared to the frequency of interest for large diesel engines like those used in trucks, heavy equipment, ships and generator sets. More sophisticated approaches like the Finite (FEM) or Boundary Element Methods (BEM) are necessary.

The objective of this project is to refine and validate a BEM approach to predict the attenuation from exhaust systems including diesel particulate filters. In this newly developed model, the diesel particulate filter is modeled as a collection of one-dimensional parallel tubes. Though the DPF itself is modeled one-dimensionally, the BEM technique allows for three-dimensional wave behavior up or down stream to the filter. The new model will be validated against measurements to be made by the Egyptian team at Ain Shams University (ASU), and a parametric study will be conducted.

The project outcomes will be disseminated to the industry in the US through the Vibro-Acoustic Consortium (VAC), which is coordinated by the US partner.

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