Internal flow characteristics in Spill-return pressure-swirl atomizers

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dc.contributor.authorMalý, Milancs
dc.contributor.authorSapík, Marcelcs
dc.contributor.authorCejpek, Ondřejcs
dc.contributor.authorLízal, Františekcs
dc.contributor.authorOndráček, Vladimírcs
dc.contributor.authorJícha, Miroslavcs
dc.contributor.authorJedelský, Jancs
dc.date.issued2019-09-04cs
dc.description.abstractThe spray produced by pressure-swirl atomizers strongly depends on the character of their internal flow. Flow field inside a swirl chamber of small pressure-swirl spill-return atomizers was examined using high-speed imaging with image post processing using an in-house Matlab code. The dimensions of the production atomizers did not allow direct visualization of their internal flow, so a scaled modular, transparent Plexiglas model was used. Its flow characteristics were matched with the originally sized atomizer using dimensionless numbers (Reynolds, Swirl, Froude numbers). The test conditions were limited to the inlet overpressure of 5 kPa and spill-to-feed ratio, SFR = 0–0.75. Various spill-return configurations were compared in terms of the spatial and temporal behaviour of the internal air-core, and liquid sheet thickness and its perturbations. The only difference among the tested configurations was the geometrical arrangement of the spill-line (SL) orifice through which the liquid is spilled away. The results show that the presence of the SL orifice affects the internal flow characteristics even when the SL is closed. An axially placed SL orifice causes a decay of the internal air-core. The off-axial SL orifices stabilize the air-core, which is vital for regular formation of the liquid sheet and high-quality spray. However, the turn-down ratio and spray stability were found to be dependent on the distance of the SL orifices from the swirl chamber centreline. The results allow to determine the optimum SL configuration for given application.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.orcid0000-0002-1193-519Xcs
dc.identifier.orcid0000-0002-7854-9533cs
dc.identifier.orcid0000-0002-0389-608Xcs
dc.identifier.orcid0000-0002-1409-5165cs
dc.identifier.orcid0000-0002-1268-8434cs
dc.identifier.other158687cs
dc.identifier.researcheridAAY-7288-2021cs
dc.identifier.researcheridAAD-1936-2019cs
dc.identifier.researcheridD-4363-2018cs
dc.identifier.researcheridCVT-7747-2022cs
dc.identifier.researcheridA-9224-2013cs
dc.identifier.scopus57189715785cs
dc.identifier.scopus57201154516cs
dc.identifier.scopus54966786300cs
dc.identifier.scopus6602494673cs
dc.identifier.scopus23090535800cs
dc.identifier.urihttp://hdl.handle.net/11012/180685
dc.language.isoencs
dc.publisherILASScs
dc.relation.urihttps://ilass19.sciencesconf.org/247487cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectInternal flowen
dc.subjectspill returnen
dc.subjectairen
dc.subjectcoreen
dc.subjecthigh speeden
dc.titleInternal flow characteristics in Spill-return pressure-swirl atomizersen
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-158687en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:47:10en
sync.item.modts2025.01.17 19:36:07en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. EÚ-odbor termomechaniky a techniky prostředícs
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