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COBEM 2023
27th International Congress of Mechanical Engineering
VALIDATION OF AN ETHANOL-REDUCED CHEMICAL KINETIC MECHANISM AT SUPERCRITICAL CONDITIONS USING REAL GAS STATE EQUATION
Submission Author:
Paulo Vitor Ribeiro Plácido , Buscando endereço... , Brazil
Co-Authors:
Paulo Vitor Ribeiro Plácido, Rogério Gonçalves dos Santos, DARIO ALVISO
Presenter: Paulo Vitor Ribeiro Plácido
doi://10.26678/ABCM.COBEM2023.COB2023-0058
Abstract
Several studies have been conducted to find an effective system to reduce particulate emissions from vehicle exhaust gas, which have become a primary source of air pollution in large cities. A promising system uses supercritical combustion, directly injecting fuel over its critical temperature and pressure. Supercritical fluids have a lower viscosity and surface tension than liquids and high diffusion rates, which promotes a uniform mixture distribution, improving thermal efficiency and reducing particulate emissions. This study focuses on supercritical Ethanol as a biofuel option to propose a reduced kinetic mechanism composed of 71 species and 684 reactions obtained by directed relation graph error propagation (DRGEP) and sensitivity analysis for simulating its combustion. This mechanism was validated using Cantera with a cubic Redlich-Kwong (RK) and an ideal (I) equation of state (EoS) through 0D constant-volume auto-ignition delay times (IDT) and an ideal EoS for laminar flame speed (LFS) simulations for pure Ethanol. The IDT results are consistent with experimental data at 10, 30, 50, 75, and 80 atm, in a temperature range of 700 - 1250 K, showing a satisfactory agreement with LFS experiments at 380 - 400 K, 1 - 4 atm and ($\phi$) of 0.6 - 1.4.
Keywords
chemical kinetic mechanism, Supercritical Combustion, Ethanol mechanism, Ignition delay time, Redlich-Kwog
