Development of an extended reactor configuration to analyze preferential segregation impact on spray autoignition

The chemical reactor concept, usually based on a homogeneous mixture, is extended to non-homogeneous two-phase flows study the impact of preferential segregation autoignition an n-heptane spray in air. To introduce inhomogeneities, two-dimensional reactors are resolved thanks direct numerical simulations (DNS) with Eulerian/Lagrangian description follow evolution carrier phase and dispersed evaporating droplets, respectively. Two-way coupling considered through exchange mass, momentum, energy between carrier-gas phase. A chemistry mechanism 29 species 52 reactions was chosen describe reaction paths. Several were performed various initial gas temperatures (i.e. low, intermediate high) geometrical physical characteristics segregation. Results confirmed that evaporative cooling, vapor mass quantity turbulence mixing play important roles flow autoignition. We discussed ignition delay as well location first hot spots according temperatures. dependence most reactive mixture fraction temperature non-monotonic, thus there strong correlation low scalar dissipation rate. On other hand, can start whatever vorticity magnitude is.