Abstract
Keywords: aftertreatment systems, emissions, monolith and random packed beds
The present work aims to analyse the energetic performances of monolith and random packed beds aftertreatment systems. A computational one-dimensional unsteady model has been developed in order to assess the heat exchange between the solid and the exhaust gas and to evaluate the energy effectiveness of the aftertreatment systems. Specifically, the model was applied to passive and active flow control modes. The former control is characterized by unidirectional exhaust gas flow through the system and it represents the technical solution largely adopted in the practice. The latter one, introduced during the last years to reduce the addition of supplemental fuel, is based on cyclic inversion of the exhaust gas between the two system ends. The influences of the engine operating conditions on the aftertreatment performances have been analysed and the fuel saving capability of the different arrangements has been investigated.