Transient Flow Uniformity Evolution in Realistic Exhaust Gas Aftertreatment Systems Using 3D-CFD
نویسندگان
چکیده
Abstract To precisely control a vehicle powertrain to minimize emissions, accurate and detailed models are needed capture the spatio-temporal variability of variables interest. The aim this work is analyze flow temperature fields in geometrically realistic — thus complex exhaust gas aftertreatment system under transient conditions. response these upstream step changes predicted using three-dimensional unsteady Reynolds-averaged Navier-Stokes (URANS) $$\kappa - \omega$$ κ - ω simulations where catalytic converter described as porous medium. A geometry with 90 $$^{\circ }$$ ∘ -bend partially dead volume used demonstrate effects time-resolved maldistribution on profiles velocity temperature. Two sets terms performed. Uniformity indices characterize distribution different catalyst channels evolution uniformity functions time axial distance into calculated at cross-sectional planes. results show that rate controlling, continuously modulating otherwise much faster via fluid properties. scale determined by balance flow, thermal inertia, heat losses from system. interplay between pressure drop governs transition new steady state uniformity. These types analyses can contribute essential information when developing reduced-order engineering represent systems, particular during rapid events such cold start.
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ژورنال
عنوان ژورنال: Emission control science and technology
سال: 2022
ISSN: ['2199-3637', '2199-3629']
DOI: https://doi.org/10.1007/s40825-022-00217-6