Cavitation erosion - scale effect and model investigations

9th International Symposium on Cavitation

Geiger, F.^1 ; Rutschmann, P.^2

Technical University of Munich, Hydraulic Laboratory Obernach, Walchensee

82432, Germany^1

Technical University of Munich, Department of Hydraulic and Water Resources Engineering, Arcistrasse 21, Munich

8033, Germany^2

关键词: Cavitation clouds;    Cavitation number;    Cloud cavitations;    Different damages;    Erosion patterns;    Hydrodynamic cavitations;    Nonlinear materials;    Optical detection;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012047/pdf
DOI  :  10.1088/1742-6596/656/1/012047

来源: IOP

【 摘 要 】

The experimental works presented in here contribute to the clarification of erosive effects of hydrodynamic cavitation. Comprehensive cavitation erosion test series were conducted for transient cloud cavitation in the shear layer of prismatic bodies. The erosion pattern and erosion rates were determined with a mineral based volume loss technique and with a metal based pit count system competitively. The results clarified the underlying scale effects and revealed a strong non-linear material dependency, which indicated significantly different damage processes for both material types. Furthermore, the size and dynamics of the cavitation clouds have been assessed by optical detection. The fluctuations of the cloud sizes showed a maximum value for those cavitation numbers related to maximum erosive aggressiveness. The finding suggests the suitability of a model approach which relates the erosion process to cavitation cloud dynamics. An enhanced experimental setup is projected to further clarify these issues.