Study on straight cavitating vortex dynamics generated due to increase in the axial flux of angular momentum

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0199240" target="_blank" >RIV/00216305:26210/26:0199240 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.euroturbo.eu/publications/proceedings-papers/ETC2025-212/" target="_blank" >https://www.euroturbo.eu/publications/proceedings-papers/ETC2025-212/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.29008/etc2025-212" target="_blank" >10.29008/etc2025-212</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study on straight cavitating vortex dynamics generated due to increase in the axial flux of angular momentum

Popis výsledku v původním jazyce

The straight cavitating vortex develops in the discharge pipe geometry of the swirl device. The onset of such a vortex is due to the prevailing flux of angular momentum over the flux of axial momentum. In other words, the flow with a significant magnitude of non-dimensional swirl number is created. These flow conditions are well known for the centrifugal pump running in reverse (turbine) mode and might be dangerous for safe operation of small hydropower devices. For this purpose, the swirling device in the form of a rotating radial blade wheel, placed in the convergent geometry of the spiral case, is used for presented research. Although this vortex seems to be coherent and relatively stable in time, significant flow dynamics exists. The only thing ensuring the quasi-straight shape of the vortex is the constant radius of the discharge geometry domain. The aim of this study is to evaluate dynamics behavior of such vortex using the experimental data and CFD simulations. The pressure signal from measurement together with the high-speed camera record of the vortex movement are correlated with results from simulations. The vortex dynamics is examined through the proper orthogonal decomposition. The vortex identification methods are used for postprocessing of CFD data to verify detailed turbulent behavior of flow. Better understanding of this flow phenomena can serve for optimization of pumps as turbines largely used for energy recovery in water distribution networks.

Název v anglickém jazyce

Study on straight cavitating vortex dynamics generated due to increase in the axial flux of angular momentum

Popis výsledku anglicky

The straight cavitating vortex develops in the discharge pipe geometry of the swirl device. The onset of such a vortex is due to the prevailing flux of angular momentum over the flux of axial momentum. In other words, the flow with a significant magnitude of non-dimensional swirl number is created. These flow conditions are well known for the centrifugal pump running in reverse (turbine) mode and might be dangerous for safe operation of small hydropower devices. For this purpose, the swirling device in the form of a rotating radial blade wheel, placed in the convergent geometry of the spiral case, is used for presented research. Although this vortex seems to be coherent and relatively stable in time, significant flow dynamics exists. The only thing ensuring the quasi-straight shape of the vortex is the constant radius of the discharge geometry domain. The aim of this study is to evaluate dynamics behavior of such vortex using the experimental data and CFD simulations. The pressure signal from measurement together with the high-speed camera record of the vortex movement are correlated with results from simulations. The vortex dynamics is examined through the proper orthogonal decomposition. The vortex identification methods are used for postprocessing of CFD data to verify detailed turbulent behavior of flow. Better understanding of this flow phenomena can serve for optimization of pumps as turbines largely used for energy recovery in water distribution networks.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceeding of the 16th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

ISBN

—

ISSN

2313-0067

e-ISSN

2410-4833

Počet stran výsledku

8

Strana od-do

1-8

Název nakladatele

European Turbomachinery Society

Místo vydání

—

Místo konání akce

Hannover, Germany

Datum konání akce

24. 3. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—