Modelling collapse aggresiveness of cavitation bubbles in hydromachinery
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F09%3A00329311" target="_blank" >RIV/61388998:_____/09:00329311 - isvavai.cz</a>
Výsledek na webu
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DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Modelling collapse aggresiveness of cavitation bubbles in hydromachinery
Popis výsledku v původním jazyce
A model of assessment of collapse aggressiveness of cavitation bubbles for the pump design is proposed. The model is focused on quantifying the energetic effects of single bubble collapses and on computational efficiency. It provides a rapid estimation of the erosion risk for near-steady-state flow with traveling bubble cavitation. The 3D code for turbulent flow is coupled with the Rayleigh-Plesset equation by iterations of continuity and momentum equations to account for density changes (two-way coupling). The model of bubble collapse aggressiveness is based on the estimation of the energy dissipated between two successive bubble rebounds. The model is tested for a 2D hydrofoil in the cavitation tunnel equipped with the acoustic bubble spectrometer. The erosion is monitored using optical profilometry. The results indicate the dominant effect of the first (most energetic) collapses and show good agreement with the experimental evidence. Application to the 3D geometry is also presented.
Název v anglickém jazyce
Modelling collapse aggresiveness of cavitation bubbles in hydromachinery
Popis výsledku anglicky
A model of assessment of collapse aggressiveness of cavitation bubbles for the pump design is proposed. The model is focused on quantifying the energetic effects of single bubble collapses and on computational efficiency. It provides a rapid estimation of the erosion risk for near-steady-state flow with traveling bubble cavitation. The 3D code for turbulent flow is coupled with the Rayleigh-Plesset equation by iterations of continuity and momentum equations to account for density changes (two-way coupling). The model of bubble collapse aggressiveness is based on the estimation of the energy dissipated between two successive bubble rebounds. The model is tested for a 2D hydrofoil in the cavitation tunnel equipped with the acoustic bubble spectrometer. The erosion is monitored using optical profilometry. The results indicate the dominant effect of the first (most energetic) collapses and show good agreement with the experimental evidence. Application to the 3D geometry is also presented.
Klasifikace
Druh
O - Ostatní výsledky
CEP obor
BK - Mechanika tekutin
OECD FORD obor
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Návaznosti výsledku
Projekt
<a href="/cs/project/GA101%2F07%2F1612" target="_blank" >GA101/07/1612: Vliv fyzikálních vlastností vody na nukleaci bublin a kavitační poškození v čerpadlech</a><br>
Návaznosti
Z - Vyzkumny zamer (s odkazem do CEZ)
Ostatní
Rok uplatnění
2009
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů