EGEE 520 A 2-D Diesel Particulate Filter Regeneration Model Yu Zhang

EGEE 520 Introduction Diesel particulate filter (DPF) collects diesel particulate (mainly soot) emissions. A soot layer is formed over a porous wall and removed by combustion (This soot layer removing process is referred as regeneration) A 2-D time-dependent model for the cross-section of a filter channel is formed to get a better understanding of the DPF regeneration process symmetry Soot layer Porous wall Inlet channel outlet channel

EGEE 520 Governing Equations Momentum Balances Navier-Stokes equation: ( in open channel) Brinkman equation: (soot layer and porous wall) Mass Balance Maxwell-Stefan diffusion and convection Energy Balance

EGEE 520 Governing Equations Chemical reactions Reaction rate Heat source

EGEE 520 Model Formulation Plug

EGEE 520 Solution  T distribution at 200s and 500s  P distribution at 0s and 500s

EGEE 520 Solution  Soot layer thickness distribution

EGEE 520 Validation  Exhaust back pressure comparison  Soot layer thickness distribution without considering chemical reactions Calculated Literature

EGEE 520 Parametric Study T=350K T=400K T=420K

EGEE 520 Conclusion Soot layer thickness distribution is non-uniform due to the non-uniform temperature distribution along the filter channel Soot layer thickness is sensitive to the exhaust temperature. As exhaust temperature increases, the soot layer thickness decreases significantly