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Numerical analyses of transient combustion process by using the Lagrangian discrete droplet method [Elektronski vir]
Jurić, Filip, strojnik ...
In this paper, the numerical simulation of diesel engine combustion process with the commercial co mputational fluid dynamics software AVL FIRE is presented. It is known than the spray process has an ...influence on the system efficiency that can be further increased by augmenting existing mathematical models. The combined effect of several parameters suc h as swirl, break - up model, and injection rate determine the spray characteristics, spray cloud shape, and the combustion process. In the observed experimental engine, the liquid fuel is injected through the pilot and main injections. The pilot injection i s used to produce a small amount of vapour that ignites and increases the mean in - cylinder temperature before the main injection occurs. At later crank angle positions, around the top dead centre, the fuel is injected through the main injection process. In this research , the Euler Lagrangian spray approach was used for spray modelling. The special fo cus of this research is given to the comparison between combustion model ECFM 3Z+ and chemical mechanism used for modelling the combustion process. Finally, a c omparison between the calculated and the experimental results is presented. The results from numerical simulations, such as the mean pressure and the rate of heat release are found to be in a good agreement with the experimental data.
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