Inner flow of fluid (VOF) method was applied in the simulation of inner flow characteristics of a swirl injector during the filling process. The resolution of the phase interface was investigated

the phenomena of the shrink of air core and the rotation of liquid film were discovered. The changes of liquid film thickness and spray angle at the injector outlet during the filling process were calculated by extracting the contours of gas phase volume fraction. The results showed that the liquid film thickness increased along with the outlet mass flow rate

while the spray angle decreased. Besides

the circumfluence in the swirl chamber was described

and the pressure field and velocity field were analyzed

indicating the change of the axial velocity was attributed to the co-effect of pressure drop and gas-liquid interaction.