Modelling collapse aggresiveness of cavitation bubbles in hydromachinery

0329311 - ÚT 2010 RIV US eng A - Abstract
Zima, Patrik - Sedlář, M. - Müller, M.
Modelling collapse aggresiveness of cavitation bubbles in hydromachinery.
CAV2009 7th International Symposium on Cavitation. Ann Arbor: University of Michigan, 2009. s. 21-21.
[CAV2009 International Symposium on Cavitation /7./. 16.08.2009-20.08.2009, Ann Arbor]
R&D Projects: GA ČR(CZ) GA101/07/1612
Institutional research plan: CEZ:AV0Z20760514
Keywords : cavitation * erosion * pumps
Subject RIV: BK - Fluid Dynamics

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.
Permanent Link: http://hdl.handle.net/11104/0175383