Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
C1-C4 ALCOHOLS FOR THE TRANSPORTATION INDUSTRY: DETAILED KINETICS MODELS ASSESSMENT IN TERMS OF LAMINAR FLAME SPEED AND IGNITION DELAY TIME
Submission Author:
Gabriel de Andrade Janene Gonini , PR
Co-Authors:
Gabriel de Andrade Janene Gonini, Laura Tatiana Meneses Barrera, Leonel R Cancino, Vinicius Rugeri Borges Bonini, Felipe Kraus, Amir Antonio Martins Oliveira
Presenter: Felipe Kraus
doi://10.26678/ABCM.ENCIT2022.CIT22-0057
Abstract
Alcohols are good biofuels and fuel additives due to their reduced ignition propensity, reducing knock propensity in spark ignition (SI) internal combustion engines (ICE). This research gathers published experimental data of C1-C4 primary alcohols to assess published detailed kinetics models in terms of ignition delay time (IDT) and laminar flame speed (LFS). In-house Python routines using Cantera toolkit simulate IDT on a constant volume reactor approach, with conditions ranging 1000/T from 0.6 to 1.2, pressure from 0.9 to 54 bar, equivalence ratio from 0.3 to 2.0, compared to literature experiments of shock tubes and rapid compression machines. The LFS simulations consider laminar flat flames, with and without the Soret and/or radiation effect. Concerning the LFS conditions, the equivalence ratio ranges from 0.7 to 1.5, for atmospheric pressure and 343 K. In terms of IDT, methanol, ethanol and n-propanol showed comparable global apparent activation energies. n-butanol has a lower value probably due to a slight negative temperature coefficient (NTC) for 1000/T > 1.1. Concerning the other exponents on the IDT correlations, pressure has the most consistent one and the anti-knock index has an interesting behavior already pointed out in a previous study. For LFS, there was better agreement with the data for lean and stoichiometric conditions, following a trend already reported in the literature. Yet, only ethanol over-predicts the LFS on the lean side of the plots, while all alcohols over-predict the results on the rich side. Methanol showed velocities higher than the three much similar results for the other alcohols.
Keywords
Detailed chemical kinetics, CANTERA, Transportation fuels, Ignition delay time, laminar flame speed
