Experimental investigation of cavitation-induced erosion around a surface-mounted bluff body

The objective of this study is to investigate the collapsing behavior cavitation, which leads erosion material. An experimental examination was conducted in a channel with semi-circular cylinder obstacle, serves as “vortex cavity” generator. Cavitation achieved by employing range pressure differences over test section and high-speed camera used observe cavitation behavior. flow field behind investigated characteristic example bluff bodies that exhibit distinct, separated vortex their wake. cases body were also compared ones without body. Erosion tests performed using paint (stencil ink). intensity characterized number (?); lower number, higher intensity. (removal paint) after 40 min operation revealed distinct repeatable results. For high large von Karman-vortex-like cavities are shed downstream obstacle. This results collapse events and, ultimately, more erosion. On other hand, at numbers, took place cavity's closure line. It seen increase intensity, area increases. Moreover, obstacle promotes localizes cavitation-induced on sample plate ultimately means body, less power required system cause patterns caused due localized load. pattern from material loss (30 h operation). A very good qualitative agreement found between two tests, requiring approximately orders magnitude running time facility. We demonstrate combined geometry, provide an efficient economical way expensive tests.