Effects of secondary breakup, collision dynamics, gravity and evaporation on droplet size distribution in a pressure-swirl JET A-1 spray

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dc.contributor.authorJedelský, Jancs
dc.contributor.authorMalý, Milancs
dc.contributor.authorVankeswaram, Sai Krishnacs
dc.contributor.authorZaremba, Matoušcs
dc.contributor.authorKardos, Réka Annacs
dc.contributor.authorCsemany, Davidcs
dc.contributor.authorČervenec, Adamcs
dc.contributor.authorJózsa, Viktorcs
dc.coverage.issue1cs
dc.coverage.volume359cs
dc.date.accessioned2024-02-26T13:45:31Z
dc.date.available2024-02-26T13:45:31Z
dc.date.issued2024-03-01cs
dc.description.abstractSize and velocity of droplets in pressure-swirl sprays vary with distance downstream the nozzle. This study aims to explain the phenomena contributing to size-resolved spatial variation of the drop size distribution for Jet A-1 spray from a small pressure swirl atomizer injected into quiescent ambient air at atmospheric conditions. The effects of secondary breakup, droplet collisions, gravity, drag-driven spray dispersion, and evaporation are evaluated. Phase Doppler anemometer (PDA) was used to resolve the velocity and size of the droplets in radial profiles at several axial distances (Z) from the nozzle exit at injection pressures between 0.5 and 1.5 MPa. The droplet motion and collision dynamics were qualitatively characterised by high-speed imaging. The analysis focused on areas along 1) the spray axis and 2) the liquid sheet direction. The first area covers small droplets with marginal evolution, while the mean drop size in the second area significantly increases downstream. The local drop size distribution and its axial evolution results from a combined effect of ballistic filtering (drifting of small droplets from periphery to spray centre and large droplets vice versa), centrifugal and turbulent droplet dispersion, and droplet collisions (increasing drop size with distance). The relative droplet-gas velocity was found at investigated Z positions too small for drag-driven secondary droplet breakup to occur. Evaporation of Jet A-1 sprayed at room temperature and pressure into still atmosphere reduces the drop size marginally. Trajectory of all drop sizes is insignificantly altered by gravity. The smallest droplets are strongly drag-driven to the spray axis, while large ones disperse centrifugally and have sufficient momentum to neglect the gravity. Combining results from imaging and laser diagnostics, various collision outcomes were identified, with a conclusion that these depend on the size and velocity of colliding droplets. Coalescing collisions dominate and strongly increase the mean drop size downstream the spray at off-axis positions while insignificantly contribute along the spray axis. The drop size span factor reduces with Z as separative collisions between large droplets and mixed-type collisions between small and large droplets narrow the drop size distribution. The above effects can be most easily amplified for drop size reduction via modification of physical properties of sprayed liquid by its heating.en
dc.description.embargo2025-11-27cs
dc.formattextcs
dc.format.extent1-21cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationFUEL. 2024, vol. 359, issue 1, p. 1-21.en
dc.identifier.doi10.1016/j.fuel.2023.130103cs
dc.identifier.issn0016-2361cs
dc.identifier.orcid0000-0002-1268-8434cs
dc.identifier.orcid0000-0002-1193-519Xcs
dc.identifier.other186884cs
dc.identifier.researcheridA-9224-2013cs
dc.identifier.researcheridAAY-7288-2021cs
dc.identifier.scopus23090535800cs
dc.identifier.scopus57189715785cs
dc.identifier.urihttps://hdl.handle.net/11012/245224
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofFUELcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0016236123027175cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessembargoedAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0016-2361/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectDroplet collisionsen
dc.subjectsecondary breakupen
dc.subjectJet A-1en
dc.subjectpressure-swirlen
dc.subjectsprayen
dc.subjectair-droplet interactionen
dc.titleEffects of secondary breakup, collision dynamics, gravity and evaporation on droplet size distribution in a pressure-swirl JET A-1 sprayen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionacceptedVersionen
sync.item.dbidVAV-186884en
sync.item.dbtypeVAVen
sync.item.insts2024.02.26 14:45:31en
sync.item.modts2024.02.26 14:13:11en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. EÚ-odbor termomechaniky a techniky prostředícs
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