Optically accessible generic exhaust gas test bench for the investigation of fundamental SCR-relevant processes

In this work, a generic exhaust gas test bench is introduced on which reproducible experiments can be performed to gain a deeper understanding of processes during exhaust gas aftertreatment of internal combustion engines. We present the design and initial flow characterization as well as tomographic measurement results of gaseous water distributions. The aim of the development was to provide a generic geometry as well as highly reproducible process boundary conditions for numerical simulation of exhaust aftertreatment phenomena. The presented initial measurements are intended to demonstrate the qualification of the test bench for extensive experimental characterization ranging from measurements of the spray injection, film evaporation, and reaction kinetics to the highly complex multiphase flow conditions during selective catalytic reduction (SCR) processes, which are characterized by high mass flows and temperatures, pronounced transients, and a corrosive atmosphere.