Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 38, Issue 1, Pages 739-748Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2020.08.013
Keywords
Anisole; Co-oxidation; Low-temperature combustion; Surrogate fuel; Rapid compression machine
Funding
- French Ministere de l'Enseignement Superieur et de la Recherche
- Hauts-de-France Region
- European Fund for Economic and Regional Development
- Aragon government [T22-20R]
- DOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies and Vehicle Technologies Offices [DE-AC52-07NA27344]
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A detailed study of isooctane/anisole blends validates a kinetic model and highlights the potential limitation of anisole addition on knock resistance. The importance of H-abstraction reactions from the methoxy group and aryl ring in ortho-position is emphasized in the formation of polar or non-aromatic products.
In order to unravel the reaction pathways relevant to anisole co-oxidation within a fuel blend, a detailed study of isooctane/anisole blends was performed with the ULille RCM. Ignition delays as well as mole fraction profiles were measured during a two-stage ignition delay using sampling and GC techniques. These results are used to validate a kinetic model developed from ab initio calculations for the most relevant rate constants which included H-atom abstraction reactions from anisole, and reactions on the potential energy surfaces of methoxyphenyl + O-2 and anisyl + O-2 . Pressure dependent rate constants were computed for the methoxyphenyl + O-2 and anisyl + O-2 reactive systems using master equation code analysis. The new kinetic model shows good agreement with the experimental data. Dual brute-force sensitivity analysis was performed, on both first-and second-stages of ignition, allowing the identification of the most important reactions in the prediction of both ignition delays. It was observed that while pure anisole does not show NTC behavior, a 60/40 isooctane/anisole blend displays such behavior, as well as two-stage ignition. This suggests anisole addition may not be as beneficial to knock resistance as expected from its high octane number. The kinetic modeling results demonstrate the importance of H-abstraction reactions both from the methoxy group and from the aryl ring in ortho-position and the addition of the resultant radicals to O-2, mostly leading to the formation of polar or non-aromatic products. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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