engleski

Influence of child droplet modelling on spray behavior in the Eulerian multiphase approach

Injectors used in Diesel engines have to be capable of introducing a high amount of liquid fuel in a short period into the combustion chamber through a small diameter nozzle. The rapid injection is performed through the common rail systems operating under the high-pressure conditions. As a result, the turbulent and aerodynamic forces act upon the fuel jet surface leading to the jet atomization - the process known as the primary breakup. The newly created droplets and unstable ligaments further disintegrate due to aerodynamic instabilities into smaller droplets in a process called the secondary breakup. For the droplets generated by the secondary atomization, different models can be employed. This research is conducted to investigate the influence of such models for child droplet production on the general spray behaviour. The results were compared to the experimental data including droplet size distribution, Sauter mean diameter, spray tip penetration and spray angle. For all simulations, a computational fluid dynamics software AVL FIRE™ was used.

CFD, Modelling, Spray, Secondary atomisation

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