Numerical simulation of an ethanol turbulent spray flame with RANS and diffusion combustion model

A detailed numerical simulation of ethanol turbulent spray combustion on a rounded jet flame is pre- sented in this article. The focus is to propose a robust mathematical model with relatively low complexity sub- models to reproduce the main characteristics of the cou- pling between both phases, such as the turbulence modulation, turbulent droplets dissipation, and evaporative cooling effect. A RANS turbulent model is implemented. Special features of the model include an Eulerian– Lagrangian procedure under a fully two-way coupling and a modified flame sheet model with a joint mixture fraction– enthalpy b -PDF. Reasonable agreement between measured and computed mean profiles of temperature of the gas phase and droplet size distributions is achieved. Deviations found between measured and predicted mean velocity profiles are attributed to the turbulent combustion modeling adopted

The authors would like to thank the Coorde- nac ̧a ̃ o de Aperfeic ̧oamento de Pessoal de Nı ́ vel Superior (CAPES) for supporting of this work under the grant ‘‘CAPES-PRO ́ -ENGENHA- RIAS/ESTUDO COMPUTACIONAL E EXPERIMENTAL DE CHAMAS TURBULENTAS DE ETANOL’’— PE004/2008 and, the Laboratory of Environmental and Thermal Engineering (LETE) of the Polytechnic School of the University of Sao Paulo