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STUDY OF EGR MIXING IN INTAKE MANIFOLD USING 1D-3D CFD COUPLED SOLVER APPROACH
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 25, 2020 by SAE International in United States
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
In this paper we are trying to study the mixing process of burnt gases from the exhaust manifold with the fresh charge entering our intake manifold into the combustion chamber. The study is carried on our three cylinder diesel engine. For the simulation of such highly pulsating flow, the boundary conditions were generated from 1D Ricardo Wave simulation & in the back end the Ricardo VECTIS 3D CFD is solving the EGR mixing in a transient phase. The mixing at each cylinder port is evaluated using the Air as well as CO2 concentration at each inlet port entry point. The EGR distribution within the port inlet tends to stabilize after 8 cycles or >5000 Crank Angle duration as is evident from the transient run. It was observed that the flow pulsations at the EGR inlet have large influence on the EGR distribution. For our Coupled CFD run we have used Realizable k-ε model which is better suited for flow involving separation, moderate swirl & the mixing of species for turbulent, pulsating flows.