Abstract
A zero-dimensional model (Senkin) in conjunction with CHEMKIN II and the implementation of a high pressure PLOG function as well as the combination of two existing and broadly validated kinetic schemes for the oxidation of mixtures of n-heptane/methyl-decanoate/methyl-9-decenoate and ethanol were used to assess the effect of ethanol addition on the unregulated emissions as well as on their formation–depletion pathways under low- to intermediate-temperature conditions. The blended fuels were formed by incrementally adding 5% of ethanol to the neat n-heptane/methyl-decanoate/methyl-9-decenoate fuel, while kee** constant pressure and equivalence ratio. The principal objective of this work was to gain a fundamental understanding of the mechanisms through which ethanol oxygenate affects amounts of formaldehyde, acetaldehyde, acetylene and butadiene. It was found that amounts of carbonyls (CH2O and CH3CHO) were higher in ethanol blends as compared to the binary diesel-biodiesel fuel, whereas the opposite trend was observed for acetylene and butadiene.
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This work was funded by the Researchers Supporting Project number (RSPD2023R765), King Saud University, Riyadh, Saudi Arabia.
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Abbreviations and notation: CI, compression ignition; PAHs, polycyclic aromatic hydrocarbons; HACA, hydrogen-abstraction-acetylene-addition mechanism; HAVA, hydrogen-abstraction-vinylacetylene-addition mechanism; NTC, negative temperature coefficient; DB, diesel–biodiesel binary fuel; DBE, diesel–biodisel-ethanol ternary fuel; MD, methyl-decanoate; MD5D, methyl-5-decenoate; MD9D, methyl-9-decenoate; s-C2H4OH, α-hydroxyethyl radical; p-C4H9, tert-butyl radical.
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Rezgui, Y., Guemini, M. & Tighezza, A. Impact of Ethanol Blending Ratios on the Unregulated Emissions Issued from the Combustion of Diesel–Biodiesel–Ethanol Mixtures. Kinet Catal 64, 716–728 (2023). https://doi.org/10.1134/S0023158423060113
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DOI: https://doi.org/10.1134/S0023158423060113