Abstract
To examine the evaporative cooling effects due to droplet group combustion, we conducted direct numerical simulations of combustion processes of n-decane polydisperse spray entering into a gaseous flat-flame stabilized in a laminar 2D counterflow configuration. Firstly, we investigated the effects of energy exchange between droplets and gaseous phase and the latent heat. The latent heat had stronger influence on the evaporative cooling effect in the droplet group combustion region. Secondly, parcel model on numerical simulations of spray combustion were examined. We found that the use of the parcel approach has a risk of causing a delay of combustion reaction, since the partial fuel vapor pressure increases at limited locations, which suppresses the global droplet evaporation rate.
