Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
The available detailed kinetics models for ethanol – An extensively numerical assessment on ignition delay times, laminar flame speed and speciation.
Submission Author:
JESSICA REBELO , SC , Brazil
Co-Authors:
JESSICA REBELO, Felipe Kraus, Leonel R Cancino
Presenter: JESSICA REBELO
doi://10.26678/ABCM.COBEM2023.COB2023-0596
Abstract
Ethanol is a renewable fuel increasingly recognized for its potential to reduce greenhouse gas emissions in transportation. To fully leverage its benefits as a biofuel in internal combustion engines (ICEs), a comprehensive understanding of its combustion kinetics is essential. Accurate and reliable kinetics mechanisms for ethanol combustion are critical for optimizing engine performance, reducing emissions, and improving fuel efficiency. Kinetic modeling also helps to identify key reactions controlling combustion, guiding the development of innovative combustion technologies. The aim of this work was to evaluate the performance of chemical kinetics mechanisms available in the literature to predict the characteristics of ethanol combustion. The simulations were carried out using the Cantera reactive flow open-source code and then compared to experimental data of ignition delay times, laminar flame speed and species concentration profiles. Therefore, five kinetics models, including Aramco v3.0 (ARAMCO), CRECK, LLNL, San Diego, and PCRL-1, were analyzed regarding their ability to reproduce the key combustion features of ethanol oxidation. Additionaly, from the PCRL-1 kinetic model, a brute-force sensivity analysis with the more importante reactions was also reported. Through analysis and comparison with experimental data, this study confirms the reliability of the examined mechanisms in simulating the combustion of ethanol under SI engine-relevant conditions. The AramcoMech v3.0, CRECK, and PCRL-1 mechanisms were found to be the most accurate in predicting ignition delay times, while the PCRL-1 and LLNL mechanisms performed well in predicting laminar flame speeds. The PCRL-1 and CRECK mechanism showed the best agreement with experimental data for species concentration profiles. Overall, this study contributes to our understanding of the fundamental chemical processes involved in ethanol combustion, and its results have important implications for engine design and optimization.
Keywords
ethanol, Ignition delay times, laminar flame speed, Detailed chemical kinetics
