Modelling collapse aggresiveness of cavitation bubbles in hydromachinery

Kód výsledku v IS VaVaI

RIV/61388998:_____/09:00329311 - isvavai.cz

Výsledek na webu

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DOI - Digital Object Identifier

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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.

Druh

O - Ostatní výsledky

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

GA101/07/1612: Vliv fyzikálních vlastností vody na nukleaci bublin a kavitační poškození v čerpadlech

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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