Numerical Simulation of Soot Formation in Spray Jet Flames

Abstract

A two-dimensional numerical simulation is applied to spray jet flames, and effects of droplet size on soot formation behavior is investigated in detail in the mono- and poly-dispersed droplet size conditions. N-decane (C10 H22) is used as a liquid fuel, and droplet motion is calculated by the Lagrangian method. The extended flamelet / progress-variable approach is employed for the turbulent combustion chemistry. A kinetically based soot formation model with the flamelet model is employed to predict soot formation. Radiation is taken into account using the discrete ordinate method. The results show that the soot is mainly formed in the large vortex structure in the downstream region and the soot formation behavior is strongly affected by the droplet size. The soot volume fraction increases with increasing the mono-dispersed droplet size, and the larger droplet in the widely-distributed condition affects the soot formation behavior.