Effects of thermodynamic pressure on laminar spray flame propagation into monodisperse fuel droplet-mists

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dc.contributor.authorOzel-Erol, Gulcan
dc.contributor.authorKucuk, Merve
dc.contributor.authorChakraborty, Nilanjan
dc.date.accessioned2026-02-08T15:15:19Z
dc.date.available2026-02-08T15:15:19Z
dc.date.issued2025
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractThe effects of droplet diameter, overall equivalence ratio (0.8-1.5), and primary evaporation zone length (2-10 mm) on the burning velocity and thermal flame thickness in laminar n-heptane monodisperse spray flames under varying pressures (1.0-2.0 bar) have been analysed using 1D numerical simulations. It is observed that for gaseous premixed flames, both flame speed and thickness decrease with increasing pressure. However, in spray flames, flame thickness increases while burning velocity decreases as pressure rises, primarily due to reduced evaporation rates that limit fuel vapor availability. Larger droplet sizes further diminish evaporation rates, which lowers burning velocity and increases flame thickness, regardless of pressure. The finite evaporation rate also results in local equivalence ratios that are lower than the overall equivalence ratio in the heat release zone within the flame, especially at high pressures and with large droplets. In overall fuel-rich mixtures (e.g., for an overall equivalence ratio of 1.5), this can lead to more reactive gaseous mixtures and higher burning velocities than corresponding gaseous premixed flames, particularly for small droplets. Notably, the burning velocity in some spray flames can exceed the burning velocity of the corresponding premixed flames at the same gaseous-phase equivalence ratio at the heat release rate location. Enhanced burning velocity is also attributed to the generation of reactive species (e.g., H-2, C2H2, C2H4) from droplet evaporation and pyrolysis behind the flame front, which diffuse back into the reaction zone and accelerate the combustion process. However, the formation of these species diminishes at higher pressures, reducing this enhancement effect.
dc.identifier.doi10.1016/j.jaecs.2025.100366
dc.identifier.issn2666-352X
dc.identifier.scopus2-s2.0-105013640472
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1016/j.jaecs.2025.100366
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5713
dc.identifier.volume23
dc.identifier.wosWOS:001564997400001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofApplications in Energy and Combustion Science
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzWOS_KA_20260207
dc.subjectSprays
dc.subjectPremixed flame
dc.subjectThermodynamic pressure
dc.subjectDroplet diameter
dc.subjectEquivalence ratio
dc.subjectBurning velocity
dc.subjectFlame thickness
dc.titleEffects of thermodynamic pressure on laminar spray flame propagation into monodisperse fuel droplet-mists
dc.typeArticle

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