100 likes | 117 Views
A 2-D Diesel Particulate Filter Regeneration Model. Yu Zhang. 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)
E N D
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 Introduction symmetry Inlet channel Soot layer Porous wall outlet channel symmetry
Momentum Balances Navier-Stokes equation: ( in open channel) Brinkman equation: (soot layer and porous wall) Mass Balance Maxwell-Stefan diffusion and convection Energy Balance Governing Equations
Governing Equations • Chemical reactions • Reaction rate • Heat source
Model Formulation Plug Plug
Solution • T distribution at 200s and 500s • P distribution at 0s and 500s
Solution • Soot layer thickness distribution
Validation • Exhaust back pressure comparison • Soot layer thickness distribution without considering chemical reactions Literature Calculated
Parametric Study T=350K T=400K T=420K
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