Product concept and design process of an SCR Mixer to solve trade-off between urea mixing uniformity and exhaust loss and to improve engineering efficiency

This study presents the development of newly proposed SCR mixer for diesel engine that improves vehicle NOx emission without rebound of the exhaust pressure loss. Unique SCR mixer structure which produces multiple vortices can realize lower NOx emission due to the highly uniform mixing of NH3 generated from the SCR spray and the exhaust gas, compared to the conventional mixer which produce a single vortex. Through its unique mixer structure constructed with some blades that generate multiple vortices. In order to study the mixer structure in a short period of time, 2 steps design process have been studied by separating parametric study in flow analysis and performance confirmation in the dual-phase flow analysis. Consequently, this newly proposed SCR mixer realize excellent mixing performance without increasing the exhaust pressure loss.