A comprehensive model for sprays emerging from high pressure
swirl injectors for GDI engine application has been developed. The
primary and secondary atomization mechanism as well as the
evaporation process both in standard and superheated conditions are
taken into account.
The spray modelling after the injection is based on the Liquid
Instability Sheet Atomization (LISA) approach, modified to
correctly predict the liquid sheet thickness at the breakup
length.
The effect of different values of the superheat degree on
evaporation and impact on the spray distribution and fuel-air
mixing is analyzed. Comparisons with experimental data show good
agreements under atmospheric conditions and with different
superheated degrees, while some discrepancies occur under higher
ambient pressures.
