Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU147573" target="_blank" >RIV/00216305:26210/22:PU147573 - isvavai.cz</a>
Result on the web
<a href="https://aip.scitation.org/doi/full/10.1063/5.0128029" target="_blank" >https://aip.scitation.org/doi/full/10.1063/5.0128029</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0128029" target="_blank" >10.1063/5.0128029</a>

Result language
angličtina
Original language name
Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments
Original language description
This work is focused on reduction of swirling in cases from hydraulic machinery and, thus, mitigation of instabilities associated with swirling flow. We study this problem analytically using the torque integral equation, numerically using computational fluid dynamics (CFD) simulations, and experimentally using a swirl generator that generates swirling flow approximating that in a draft tube of a hydro turbine operating at a part load, featuring an unsteady spiral vortex—the vortex rope. The analytical description elucidates the effect of different installations on the circumferential velocity. Unconventional conical perforated installations targeting at increasing the dissipation were proposed and tested. The rather unsatisfactory results led to proposing fins placed unconventionally away from the wall, closer to the diffuser axis, which were subsequently shown to be able to reliably suppress the unsteady vortex rope. Their effect is documented by an analysis of CFD results including the proper orthogonal decomposition as well as experimental observations and measurements.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20302 - Applied mechanics

Project
<a href="/en/project/TH04020045" target="_blank" >TH04020045: Suppression of negative effects of inflow recirkulation in high-capacity cooling pumps</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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