engleski

Numerical simulations of primary breakup process by using the Euler Eulerian multi-fluid approach

This work deals with numerical simulations of liquid fuel atomization focusing on the processes in the near nozzle region. In internal combustion diesel engines the liquid fuel is injected into the combustion chamber with high velocities through as mall diameter nozzle. Accordingly, the turbulent and aerodynamic forces impact the fuel jet surface which results in the jet atomization. The atomization process is modelled by employing the Euler Eulerian multi-fluid approach where both, the liquid and the gaseous phases are considered as continuum. Furthermore, the liquid phase is divided into a finite number of drop classes characterized with the drop diameter. Considering the fact that the experimental investigation of the optically dense spray region (in the vicinity of the nozzle) is highly complex, the simulation results were compared to the available Direct Numerical Simulations (DNS) results of fuel jet primary breakup process. The axial and radial mixture volume fraction were compared to the DNS studies and the model coefficients have been appropriately chosen. The results of the study show a promising results where the used model successfully captured the fuel jet disintegration process.

CFD; Modelling; Spray; Primary atomization

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