Thermal analysis of active catalytic diesel particulate filter regeneratio

A one-dimensional computational fluid dynamics (CFD) model has been developed to simulate the exhaust flow and chemical reactions in the Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) under different active flow schemes. Experiments have been carried out with the DPF and DOC units with a single cylinder diesel engine. Supplemental fuel has been delivered through the variations in exhaust gas temperatures by the supplemental exhaust gas heating. The thermal response analysis has been carried out on the basis of the simulation results of various active flow control schemes and the supplemental energy efficiencies for different active flow configurations has been compared. The theoretical and experimental analyses indicates that the active flow control schemes have fundamental advantages in optimizing the converter thermal management that includes reduced supplemental heating, increased thermal retention and recuperation, and improved overheating protection. Further investigations have been carried out to identify the energy efficient pathway to enable aftertreatment operation and to sustain conditions favourable to the aftertreatment operations without overheating.