engleski

Internal Combustion Engine Soot and NOx Formation Simulation

The reduction of NOx and soot emissions are, beside the improvement of fuel efficiency, the main goals of modern diesel engines development. Advanced experimental and simulation techniques are used in order to clarify the spray break-up and pollutant formation mechanisms. To simulate the details of the physical and chemical phenomena that define the combustion process, Computational Fluid Dynamics (CFD) is the most appropriate simulation technique. In the present work, a CFD simulation of a diesel engine fuel injection process is performed. It includes the piston motion, the air-fuel mixing and the combustion simulation. The focus was on the NOx and soot formation processes. The OpenFOAM software toolbox was used for the purpose. The Huh model was used to simulate the fuel injection. The chemical reactions were tracked with a 15 specie Chemkin type reaction model. A modified Fusco model was used for soot formation and oxidation. After the development of the cylinder calculation mesh, the models were tuned. The simulation results were compared with experimental data. Finally, several split injection patterns were tested in order to evaluate its influence on pollutants formation.

diesel engine ; injection ; combustion ; soot ; NOx ; CFD simulation

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