Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1015616
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dc.contributor.authorJamet, G.pt_BR
dc.contributor.authorMuralha, A.pt_BR
dc.contributor.authorMelo, J.pt_BR
dc.contributor.authorManso, P. A.pt_BR
dc.contributor.authorDe Cesare, G.pt_BR
dc.date.accessioned2022-12-14T14:35:00Zpt_BR
dc.date.accessioned2023-02-28T15:40:38Z-
dc.date.available2022-12-14T14:35:00Zpt_BR
dc.date.available2023-02-28T15:40:38Z-
dc.date.issued2022-01-09pt_BR
dc.identifier.citationDOI: 10.3390/w14020173pt_BR
dc.identifier.urihttps://repositorio.lnec.pt/jspui/handle/123456789/1015616-
dc.description.abstractSpillways are a requirement for dams’ safety, mainly preventing overtopping during floods. A common spillway solution involves plunging jets, which dissipate a considerable flow energy in the plunge pool. Energy dissipation has to occur in a controlled manner to avoid endangering the dam foundation and river slopes. Indeed, a scouring process in the downstream riverbed will inevitably develop until equilibrium is reached, otherwise a suitable pre-excavated or concrete lined plunge pool has to be provided. This paper focuses on experimental studies in which particular attention was paid to the dynamic pressures in the plunge pool floor at the vicinity of the jet stagnation zone sampled at 2.4 kHz. A rectangular experimental facility, 4.00 m long and 2.65 m wide, was used as plunge pool. Tests involved a vertical circular plunging jet with velocity ranging from 5 to 18 m/s and plunge pool depth ranging from 4.2 to 12.5 jet diameters. Differences in dynamic pressure measurements are highlighted between transducers located in the inner and outer regions of the jet diameter footprint. Several parameters characterizing the dynamic pressures evidence trends tied with the jet velocity that, to the authors’ knowledge, were not dealt in previous research. These can derive from the coupling effects of consequent recirculating motions and air entrainment in the limited-size plunge pool. Both effects, increasing with velocity, cause an reduction in the efficiency of the diffusing jet shear layer. This aspect deserves further investigation to achieve a better understanding and more complete characterization.pt_BR
dc.language.isoengpt_BR
dc.publisherMDPIpt_BR
dc.rightsrestrictedAccesspt_BR
dc.subjectspillwaypt_BR
dc.subjectplunging jetpt_BR
dc.subjectexperimental researchpt_BR
dc.subjectdynamic pressurespt_BR
dc.subjectstagnation zonept_BR
dc.subjectenergy dissipationpt_BR
dc.subjectscourpt_BR
dc.titlePlunging Circular Jets: Experimental Characterization of Dynamic Pressures near the Stagnation Zonept_BR
dc.typeworkingPaperpt_BR
dc.identifier.localedicaoBasileia, Suíçapt_BR
dc.description.pages17ppt_BR
dc.description.volume14, 173pt_BR
dc.description.sectorDHA/NREpt_BR
dc.description.magazineWaterpt_BR
dc.contributor.peer-reviewedSIMpt_BR
dc.contributor.academicresearchersSIMpt_BR
dc.contributor.arquivoNAOpt_BR
Appears in Collections:DHA/NRE - Comunicações a congressos e artigos de revista

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