Journal
FUEL
Volume 328, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.125225
Keywords
Octane number; Ignition delay; Kinetic model; Prenol; Low -temperature combustion; Surrogate fuel
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Funding
- French Ministere de l'Enseignement Superieur et de la Recherche
- Hauts-de-France Region
- European Fund for Economic Regional Development
- ADEME
- DOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies and Vehicle Technologies Offices [DE-AC5207NA27344]
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This study investigates the octane hyperboosting effect of prenol through experimental and kinetic modeling approaches. The results show that prenol addition reduces ignition phenomena and improves knock resistance. This behavior is attributed to gas-phase reactivity of prenol and a catalytic nature that cannot be captured by kinetic modeling.
A detailed experimental and kinetic modeling study was dedicated to understand the reported octane hyperboosting effect of prenol, by means of the measurement of the ignition delay times of its blends with iso-octane, and measurement of the mole fraction profiles of the fuels and intermediates inside the ULille rapid compression machine. These results show that prenol addition leads to a reduction of the first-stage ignition phenomena and negative temperature coefficient behavior, which is only qualitatively captured by the model and is consistent with knock resistance improvement. It is suggested that this behavior is caused by two different factors. The first originates from gas-phase reactivity of prenol, and spans from the formation of unreactive unsaturated species through resonance-stabilized radicals, thereby constituting a competitive pathway for the radical pool generated by iso-octane. The second is of catalytic nature and cannot be captured by means of gas-phase kinetic modeling, but could also play an important role in the behavior of prenol in internal combustion engines.
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