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UNSTEADY EFFECTS ON MIXING AND COMBUSTION PROCESSES IN A REALISTIC IC-ENGINE BY USING LARGE EDDY SIMULATION

Dmitry Goryntsev
Institute for Energy and Powerplant Technology (EKT), TU-Darmstadt, Petersenstr. 30, 64287, Darmstadt, Germany

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany

Abstract

Large eddy simulation (LES) based analysis of the unsteady variations of the in-cylinder flow and their effects on mixing and combustion processes in direct injection spark-ignition engine is presented in this paper. The configuration under study represents a four-stroke internal combustion engine with variable tumble-system. The KIVA-3V code extended to LES has been used to perform 40 consecutive engine cycles in order to characterize cycle-to-cycle fluctuations of the flow field quantities. The impact of parameters of fuel spray injection on mixture preparation and combustion processes is pointed out. For this purpose non-reacting as well as reacting two-phase flows have been analyzed.