NUMERICAL INVESTIGATION ON THE ENERGETIC PERFORMANCES OF CONVENTIONAL AND PELLET AFTERTREATMENT SYSTEMS IN FLOW-THROUGH AND REVERSE-FLOW DESIGNS.

The aim of the paper is the analysis of the energetic performances of structured and pelletized aftertreatment systems in flow-through and reverse-flow designs (passive and active flow control, respectively) for Diesel internal combustion engines. To this purpose, the influence of the engine operating conditions on the system performances has been investigated adopting a one-dimensional transient model. Specifically, the thermal behaviour and the fuel saving capability of several arrangements have been characterized. The analysis has shown that the active emission control system with pelletized design guarantees higher heat reten-tion capability. Furthermore, the numerical model has revealed the significant influence of the solid and exhaust gas temperature on the energy efficiency of the aftertreatment systems and the large effect of exhaust mass flow rate and unburned hydrocarbons concentration. [ABSTRACT FROM AUTHOR]