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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/TH04020045" target="_blank" >TH04020045: Potlačení nežádoucích projevů vstupní recirkulace u vysokokapacitních chladících čerpadel</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICS OF FLUIDS

ISSN

1070-6631

e-ISSN

1089-7666

Svazek periodika

34

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

1-18

Kód UT WoS článku

000898084200009

EID výsledku v databázi Scopus

2-s2.0-85144626380