Validity of flamelet/progress-variable approach on numerical simulation of spray combustion

Abstract

The validity nf the flamelet/progress-variable approach (FPVA) for spray flames is investigated by performing a DNS of a two-dimensional spray jet flame. To take the heat transfer between the spray dispersed and gaseous phases into account, enthalpy is chosen as a progress variable for the FPVA. The combustion behavior predicted using the FPVA is compared to those using the Arrhenius formation and the conventional flamelet methods with and without a modified chemtable, in which the heat transfer between the phases is accounted for. The results show that the FPVA is able to well catch the flame temperature decrease due to the heat transfer, and that it is much superior to the conventional flamelet methods for spray flames.