Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Validation of a Reduced Chemical Kinetic Mechanism for Supercritical Combustion of Gasoline/Ethanol Blends
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.ENCIT2022.CIT22-0025
Abstract
Gas emission and fuel efficiency regulations require clean and highly efficient combustion systems. A promising system is the direct injection of gasoline under ultra-high pressure and temperature above the critical point of fuel species (called supercritical). Supercritical combustion is a clean and efficient combustion technology that reduces particulate emissions of engines. This study proposes a kinetic mechanism for the combustion of supercritical gasoline/ethanol blends. Reduced gasoline surrogate and ethanol kinetic mechanisms were obtained by applying Directed Relation Graph error propagation and sensibility analysis to the gasoline mechanism of Andrae (159 species and 734 reactions, composed of n-heptane, isooctane, toluene, and Diisobutylene (TRF/DIB)), and to the ethanol mechanism of Cancino (136 species and 1349 elementary reactions). A TRF/DIB skeletal model (118 species and 580 reactions) and a reduced model for ethanol (28 species and 193 reactions) were obtained. These two models were combined into a gasoline/ethanol mechanism (124 species and 703 reactions), which was validated using 0D constant-volume auto-ignition delay times (IDT) simulations and available experimental results under supercritical conditions. The simulation results are consistent with the experimental data, and the merged kinetic mechanism can predict the IDT under high-pressure ranges (30, 50, and 70 atm) and temperatures between 690-1200 K.
Keywords
chemical kinetic mechanism, Supercritical Combustion, Gasoline mechanism, Ethanol mechanism
