Selective Catalytic Reduction (SCR) of NOx through injection of Urea-Water-Solution (UWS) into the hot exhaust gas stream is an effective and extensively used strategy in internal combustion engines. Even though actual SCR systems have 95-96% de-NOx efficiency over test cycles, real driving emissions of NOx are a challenge, proving that there is room for improvement. The efficiency of the NOx conversion is highly dependent on the size of UWS droplets and their spatial distribution. These factors are, in turn, mainly determined by the spray characteristics and its interaction with the exhaust gas flow. The main purpose of this study is to numerically investigate the sensitivity to the modelling framework of the evaporation and mixing of the spray upstream of the catalyst. The dynamics of discrete droplets is handled through the Lagrangian Particle Tracking framework, with models that account for droplet breakup and coalescence, turbulence effects, and water evaporation. All simulations have been run in the commercial code Ansys Fluent 16.0. Experimental validation of droplet size distribution is carried out through PDPA measurements. Through the present study we have identified suitable modelling setup that provides accurate results with a competitive computational cost. Results also show the importance of accounting for the effects of evaporation and turbulent fluctuations in the droplet phase.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Numerical Analysis of Urea-SCR Sprays under Cross-Flow Conditions


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Heide, Jakob (Autor:in) / Karlsson, Mikael (Autor:in) / Altimira, Mireia (Autor:in)

    Kongress:

    WCX™ 17: SAE World Congress Experience ; 2017



    Erscheinungsdatum :

    2017-03-28




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Flow and Hear Transfer Characteristics of Impinging Diesel Sprays under Cross-Flow Conditions

    Arcoumanis,C. / Cutter,P.A. / Imperial College of Science, Technology and Medicine,GB | Kraftfahrwesen | 1995



    Numerical Analysis of the Injection Angle of Urea-Water Sprays for the Ammonia Generation in Realistic Test Conditions

    Bracho, Gabriela / Marco, Javier / Marti-Aldaravi, Pedro et al. | SAE Technical Papers | 2022


    Numerical modeling of fuel sprays in DISI engines under early-injection operating conditions

    VanDerWege,B.A. / Lounsberry,T.H. / Hochgreb,S. et al. | Kraftfahrwesen | 2000


    Numerical Simulations of High Reactivity Gasoline Fuel Sprays under Vaporizing and Reactive Conditions

    Ahmed, Ahfaz / Mohan, Balaji / Hernandez Perez, Francisco et al. | SAE Technical Papers | 2018