To study the atomization and evaporation charactertistics of rear intake vaporizer

the experiment researched the influences of intake temperature

air fuel ratio (AFR)

wall temperature and inlet air velocity on evaporation efficiency. Result of the experiment showed that intake temperature and inlet air velocity were two major factors influencing evaporation efficiency; when AFR decreased to 3.0

the flow pattern transformed from film boiling to transition boiling

now heat efficiency was the lowest. Discrete phase model (DPM) and droplet splashing model were employed to simulate the two-phase flow in the vaporizer. Calculation of evaporation efficiency was in reasonable agreement with experimental data. The numerical results show that the increase of inlet air velocity can improve the atomization quality

but it is not conducive to the uniformity of droplet distribution. Sauter mean diameters（SMD） is proportional to the -1.69 power of inlet air velocity.