A new reduced kinetic mechanism for turbulent jet diffusion flames of bioethanol

摘要

In the last years, the understanding of the biofuels combustion processes has been facilitated through the progress of asymptotic methods, due to the difficulty of simulating the large number of reactions and species involved in the combustion. To model the molecular mixing and the combustion of a turbulent jet diffusion flame of bioethanol was using a model based on the equations of Navier-Stokes, mixture fraction, mole fraction of species and enthalpy, which are written following the large-eddy simulation approach. The Eulerian formulation is used to solve the equations governing the gas phase. The effect of the droplets of the liquid phase is considered by the introduction of appropriate source terms in the equations of the gas phase. To decrease the stiffness of the reactive system of equations, a reduced kinetic mechanism of bioethanol is developed. The reduced mechanism obtained is tested to simulate a turbulent jet diffusion flame and the results compare favorably with data found in the literature. The reduced mechanism can facilitate the work of researchers in this field, because the methodology developed allows decreasing considerably the time needed to obtain reasonable results for confined turbulent jet diffusion flames of bioethanol.