One Dimensional Backpressure Model for Asymmetrical Cells DPF

Abstract

<div class="htmlview paragraph">The development of the Diesel Particulate Filter (DPF) cell geometry and DPF size for new applications requires specific tools to predict the pressure drop as a function of filter characteristics, mass flow and filter loading. A 1-D permeability model is most useful for this type of work.</div> <div class="htmlview paragraph">This paper presents the development of a 1-D physical model of DPF permeability. This model includes the symmetric and asymmetric channel shape and is able to simulate various functional phases of the DPF through its lifetime: with or without soot and with or without ash.</div> <div class="htmlview paragraph">This kind of model needs several physical coefficients, in order to describe the flow behavior. This work explains the determination of the physical coefficients of the 1-D model. The large disparity of the literature is shown. Therefore, it is necessary to carefully determine these coefficients. Several methods were used for each functional phase of the DPF life:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"><div class="htmlview paragraph">1-D model and experimental measurements identification</div> </li> <li class="list-item"><div class="htmlview paragraph">3-D model</div> </li> <li class="list-item"><div class="htmlview paragraph">Specific prototypes</div> </li> </ul> </div> <div class="htmlview paragraph">Various methods have shown a good correlation.</div> <div class="htmlview paragraph">The 1-D model and the physical validation were made by comparing numerical and experimental results for a different asymmetrical geometry DPF that was not used for the 1-D model establishment. This comparison is performed with and without soot and with and without synthetic ash.</div> <div class="htmlview paragraph">The main result of the work consists in demonstrating the existence of a non-linear permeability coefficient for the soot layer.</div>