Numerical 3D flow simulation of attached cavitation structures at ultrasonic horn tips and statistical evaluation of flow aggressiveness via load collectives

9th International Symposium on Cavitation

Mottyll, S.^1 ; Skoda, R.^1

Department of Hydraulic Fluid Machinery, Ruhr-Universität Bochum, Universitätsstr. 150, Bochum

44801, Germany^1

关键词: 3D flow simulation;    Cavitation model;    Cavitation structure;    Collapse pressure;    Hydrodynamic cavitations;    Post processing;    Statistical evaluation;    Ultrasonic horn;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012052/pdf
DOI  :  10.1088/1742-6596/656/1/012052

来源: IOP

【 摘 要 】

A compressible inviscid flow solver with barotropic cavitation model is applied to two different ultrasonic horn set-ups and compared to hydrophone, shadowgraphy as well as erosion test data. The statistical analysis of single collapse events in wall-adjacent flow regions allows the determination of the flow aggressiveness via load collectives (cumulative event rate vs collapse pressure), which show an exponential decrease in agreement to studies on hydrodynamic cavitation [1]. A post-processing projection of event rate and collapse pressure on a reference grid reduces the grid dependency significantly. In order to evaluate the erosion-sensitive areas a statistical analysis of transient wall loads is utilised. Predicted erosion sensitive areas as well as temporal pressure and vapour volume evolution are in good agreement to the experimental data.