Numerical investigation the effects of initial injection temperature on the flow field and spray structure

In this paper, the effect of the initial injection temperature of droplets on the flow field and spray behavior is numerically investigated. To make this investigation the Eulerian gas phase equations together with the Lagrangian liquid phase equations are solved using the two- way coupling between the two phases. Based on the results, it has been shown the effect of the initial temperature of droplets on total mass evaporation and spray tip penetration is negligible, but the results show a significant effect in the velocity field near the injector. Colder droplets stay in the flow field a longer period of time, so they can lose more momentum in to the flow field, as a result, the velocity field of the gas-phase is changed considerably. The other interesting result is that the farther droplet position from the nozzle, the less impact of initial temperature can be seen, due to the fact that after a proper time and distance from the nozzle, most of the droplets have reach of their boiling temperature, so they behave similarly and have similar effect on the flow field.

کلیدواژه ها:

Evaporation ، Spray-Modeling ، Multiphase-Flow