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Experimental Investigation of Vortex Ring Formation as a Consequence of Spiral Vortex Re-connection by Å tefan, D; Rudolf, P; Hudec, M; Uruba, V; Procházka, P; Urban, O is a Agricultural and Biological Sciences article available to read on EtoBox.

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Abstract 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 m

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Author

Å tefan, D; Rudolf, P; Hudec, M; Uruba, V; Procházka, P; Urban, O

Publisher

IOP Publishing (ISSN 1755-1307)

Published

2019

Language

EN

Field

Agricultural and Biological Sciences (Physical Sciences)