Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

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dc.contributor.authorZemanová, Luciecs
dc.contributor.authorRudolf, Pavelcs
dc.coverage.issue24cs
dc.coverage.volume13cs
dc.date.issued2020-12-15cs
dc.description.abstractThe paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machinesen
dc.formattextcs
dc.format.extent1-37cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationENERGIES. 2020, vol. 13, issue 24, p. 1-37.en
dc.identifier.doi10.3390/en13246617cs
dc.identifier.issn1996-1073cs
dc.identifier.orcid0000-0003-0553-4434cs
dc.identifier.orcid0000-0003-2622-7898cs
dc.identifier.other167277cs
dc.identifier.researcheridB-1778-2017cs
dc.identifier.researcheridI-9334-2016cs
dc.identifier.scopus54783227700cs
dc.identifier.urihttp://hdl.handle.net/11012/195841
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofENERGIEScs
dc.relation.urihttps://www.mdpi.com/1996-1073/13/24/6617cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1073/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjecthydraulic machinesen
dc.subjectpumpsen
dc.subjectturbinesen
dc.subjectsidewall gap flowen
dc.subjectdisk frictionen
dc.subjectaxial thrusten
dc.titleFlow Inside the Sidewall Gaps of Hydraulic Machines: A Reviewen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-167277en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:47:06en
sync.item.modts2025.01.17 15:25:14en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. EÚ-odbor fluidního inženýrství Viktora Kaplanacs
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EÚ-odbor fluidního inženýrství Viktora Kaplana