Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL EVALUATION OF THE LAMINAR FLAME SPEED OF ETHANOL WITH LOW WATER CONCENTRATIONS
Submission Author:
Lucas Martin , PR
Co-Authors:
Lucas Martin, Roberto Wolf Francisco Jr., Amir Antonio Martins Oliveira
Presenter: Lucas Martin
doi://10.26678/ABCM.ENCIT2020.CIT20-0427
Abstract
Bioethanol is an important biofuel that has contributed to reducing of the pollutant emissions and dependence on fossil fuels. One important fact of ethanol production is the great amount of water present after the fermentation process, demanding a high amount of energy to separate trough distillation up to azeotropic concentration and another amount of energy for higher purity. This work aims to present a better understanding of the combustion properties of ethanol in the presence of water close to the azeotropic region. The property evaluated was the laminar flame speed using three combustion mechanisms most reported in the literature. First, a mesh analysis and the parameters defined for the simulation are presented. Then, the laminar flame speed was simulated for various water/ethanol mixtures (0%, 4%, 7.5% and 24% water by mass), equivalence ratio between 0.7 and 1.3 and unburned temperature of 358K, 450K and 600K. A small influence was observed of the water concentration on the flame speed for the poor mixtures. However, for rich mixtures this effect was more significant.
Keywords
ethanol water fraction, laminar flame speed, Reaction mechanism, adiabatic flame temperature
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