Chemical Structure of Lean and Stoichiometric Laminar Flames of Methylcyclohexane at Atmospheric Pressure

Vladislav V. Matyushkov, Anatoly A. Chernov, Artëm M. Dmitriev () and Andrey G. Shmakov
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Vladislav V. Matyushkov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Anatoly A. Chernov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Artëm M. Dmitriev: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Andrey G. Shmakov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia

Energies, 2024, vol. 17, issue 23, 1-18

Abstract: Methylcyclohexane (MCH, C 7 H 14 ) is a typical component in hydrocarbon fuels and is frequently utilized in surrogate fuel mixtures as a typical representative of alkylated cycloalkanes. However, comprehensive experimental studies on speciation during its combustion remain limited. This research investigates for the first time the chemical structure of laminar premixed flames of lean and stoichiometric mixtures (? = 0.8 and 1.0) of MCH/O 2 /Ar under atmospheric pressure. Using probe-sampling molecular-beam mass spectrometry (MBMS), the spatial distribution of 18 compounds, including reactants, products, and intermediates, in the flame front was measured. The obtained results were compared with numerical simulations based on three established chemical–kinetic models of MCH combustion. The comparative analysis demonstrated that while the models effectively describe the profiles of reactants, primary products and key intermediates, significant discrepancies were observed for various C 2 –C 6 compounds. To indicate the roots of the discrepancies, a rate of production (ROP) analysis was performed in each simulation. ROP analyses revealed that the primary cause for the discrepancies could be attributed to the overprediction of the rates of initial stages during MCH decomposition. Particularly, the role of non-elementary reactions was emphasized, indicating the need for refinement of the mechanisms based on new experimental data.

Keywords: methylcyclohexane; fuel surrogate; flame structure; flame radicals; flame chemical speciation; molecular-beam mass spectrometry; kinetic mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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