Cavitation due to an impacting sphere

9th International Symposium on Cavitation

De Graaf, K.L.^1 ; Brandner, P.A.^1 ; Pearce, B.W.^1 ; Lee, J.Y.^1

Australian Maritime College, University of Tasmania, Launceston

TAS

7250, Australia^1

关键词: Cavitation bubble;    Cavitation number;    Flat surfaces;    Impact velocities;    Log-laws;    Maximum bubble radii;    Static pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012014/pdf
DOI  :  10.1088/1742-6596/656/1/012014

来源: IOP

【 摘 要 】

Cavitation associated with the impact of a sphere on a flat surface is investigated using high-speed photography. The sphere, of diameter 15 or 45 mm and made from Ertacetal® or stainless steel, was fully submerged and accelerated using a spring-loaded mechanism to achieve Reynolds numbers based on impact velocity and sphere radius of up to 7.2×104. The static pressure and impact velocity were varied to achieve cavitation numbers ranging from 8.9 to 120.9. High-speed photography of the impacting sphere and induced cavitation bubble was filmed at 105-140 kHz. A log law relationship was found between the non-dimensional maximum bubble radius and the cavitation number. The relationship was modulated by the material properties. Interaction between the sphere and the bubble was also noted.