Modelling collapse aggresiveness of cavitation bubbles in hydromachinery
Result description
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.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Modelling collapse aggresiveness of cavitation bubbles in hydromachinery
Original language description
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.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
BK - Liquid mechanics
OECD FORD branch
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Result continuities
Project
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Basic information
Result type
O - Miscellaneous
CEP
BK - Liquid mechanics
Year of implementation
2009