Bubble-induced sheet cavitation inception on an isolated roughness element

9th International Symposium on Cavitation

Van Rijsbergen, Martijn^1 ; Slot, Jesse^1

Maritime Research Institute Netherlands (MARIN), P O Box 28, Wageningen

6700 AA, Netherlands^1

关键词: Critical diameter;    Isolated roughness;    Minimum pressure;    Nucleation process;    Rayleigh-Plesset equation;    Roughness elements;    Sheet cavitation;    Working mechanisms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012172/pdf
DOI  :  10.1088/1742-6596/656/1/012172

来源: IOP

【 摘 要 】

The nucleation process on an isolated roughness element, located at the point of minimum pressure of a NACA 0015 hydrofoil was studied experimentally and computationally. The objective of this study was to investigate the working mechanism of bubble-induced sheet cavitation inception. High-speed micro-scale observations show the generation of a streak of cavitation - attached to the roughness element - in the wake of the bubble. Below its critical diameter, the bubble can detach from the streak cavity and travel on while the streak cavity remains. The solutions of a Rayleigh-Plesset equation along a streamline extracted from a RANS calculation show strong similarities with the experimental observations, but a factor 5 to 10 higher frame rate is needed to validate the calculations.