Experimental investigation of vortex ring formation as a consequence of spiral vortex re-connection
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F19%3APU134728" target="_blank" >RIV/00216305:26210/19:PU134728 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1088/1755-1315/405/1/012033" target="_blank" >http://dx.doi.org/10.1088/1755-1315/405/1/012033</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1755-1315/405/1/012033" target="_blank" >10.1088/1755-1315/405/1/012033</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Experimental investigation of vortex ring formation as a consequence of spiral vortex re-connection
Popis výsledku v původním jazyce
The unsteady shape variation of a cavitating spiral vortex is experimentally studied pointing out the repetitive creation of vortex ring (or vortex loop). To generate the spiral vortex structure, a newly designed vortex generator is employed. This generator is used to study the decelerated swirling flow leading to the spiral vortex formation as a consequence of spiral vortex breakdown, which is considered to be the main triggering mechanism for the occurrence of the coherent vortex rope structure in the Francis turbine draft tube operated at part load conditions. Thanks to its design, the vortex generator enables to change the ratio between fluxes of axial momentum and tangential moment of momentum of generated swirl. Using this set-up, the behavior of the vortex structure changes in a similar way as the flow rate variation in the draft tube of Francis turbine. At certain flow conditions, the spiral vortex movement is characterized by sudden spiral entanglement leading to disconnection of a vortex ring and followed by spiral reconnection. Thanks to the transparent diffuser of the swirl generator apparatus, both high-speed camera recording of the cavitating vortex and PIV measurements of velocity fields at cavitationfree conditions are employed. The main aim of this paper is to link the visual observation of the above described vortex dyn
Název v anglickém jazyce
Experimental investigation of vortex ring formation as a consequence of spiral vortex re-connection
Popis výsledku anglicky
The unsteady shape variation of a cavitating spiral vortex is experimentally studied pointing out the repetitive creation of vortex ring (or vortex loop). To generate the spiral vortex structure, a newly designed vortex generator is employed. This generator is used to study the decelerated swirling flow leading to the spiral vortex formation as a consequence of spiral vortex breakdown, which is considered to be the main triggering mechanism for the occurrence of the coherent vortex rope structure in the Francis turbine draft tube operated at part load conditions. Thanks to its design, the vortex generator enables to change the ratio between fluxes of axial momentum and tangential moment of momentum of generated swirl. Using this set-up, the behavior of the vortex structure changes in a similar way as the flow rate variation in the draft tube of Francis turbine. At certain flow conditions, the spiral vortex movement is characterized by sudden spiral entanglement leading to disconnection of a vortex ring and followed by spiral reconnection. Thanks to the transparent diffuser of the swirl generator apparatus, both high-speed camera recording of the cavitating vortex and PIV measurements of velocity fields at cavitationfree conditions are employed. The main aim of this paper is to link the visual observation of the above described vortex dyn
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
—
OECD FORD obor
20301 - Mechanical engineering
Návaznosti výsledku
Projekt
<a href="/cs/project/GA17-01088S" target="_blank" >GA17-01088S: Prostorová nestabilita smykové vrstvy při nepříznivém gradientu tlaku</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
IOP Conference Series: Earth and Environmental Science
ISBN
—
ISSN
1755-1315
e-ISSN
—
Počet stran výsledku
6
Strana od-do
1-6
Název nakladatele
Neuveden
Místo vydání
neuveden
Místo konání akce
Stuttgart
Datum konání akce
9. 10. 2019
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
000562376700033