City Research Online

Abstract

This study investigates the in-nozzle flow dynamics and near-nozzle spray characteristics of multiple fuels relevant to sustainable aviation, including conventional diesel, Jet-A, two sustainable aviation fuel (SAF) samples, bicyclohexyl (BCH) and C-4; and a surrogate, dodecane. Experiments were conducted with two orifices that have distinct internal geometries, one straight and one converging, under varying injection-pulse durations. Overall, cavitation and spray behaviors did not differ substantially among the fuels, apart from BCH in the converging orifice, where its higher viscosity led to pronounced string cavitation. This converging geometry suppresses geometric cavitation yet enables string cavitation, resulting in a noticeably larger spray cone angle for BCH. Conversely, the straight orifice design does not suppress geometric cavitation, BCH exhibiting similar cavitation levels to the other fuels under these conditions. These cavitation patterns were reflected in the spray cone-angle measurements, where BCH showed the highest angles in the converging orifice and only average angles in the straight configuration.

Publication Type:	Article
Additional Information:	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy & Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.energyfuels.5c01353.
Publisher Keywords:	Fluid dynamics, Fuels, Mathematical methods, Redox reactions, Viscosity
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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