Mixture model approach for the study of the inner flow dynamics of an AdBlue dosing system and the characterization of the near-field spray
Selective Catalytic Reduction stands for an effective methodology for the reduction of NOx emissions from diesel engines. For it, the injection of Urea Water Solution (UWS) plays a major role in the process, both in the injector far-field as well as in the near-field. Computational Fluid Dynamics (CFD) allow to have a description of the physics without the need of experimental installations. The main objective of this study is to predict characteristics of the flow of interest inside the injector as well as spray morphology in the near field of the spray. For it the nozzle geometry has been reconstructed from X-Ray tomography data, and an Eulerian-Eulerian approach has been applied to study the liquid phase of the UWS with a LES approach for turbulence modeling. The injector unit is subjected to typical low-pressure working conditions. The results extracted from it comprise parameters that characterize the hydraulic behavior as well as jet intact length.