3-D reconstruction of bubbles inside valve based on multi-mirrors imaging

Abstract

The cavitation phenomenon in water-hydraulic transparent valve was studied regarding the morphology of bubbles in the process of cavitation in this paper. Firstly, the setup with a multi-angle plane mirror imaging system was built, and the experimental image data of the water-hydraulic transparent valve was collected and stored by a high-speed camera and an Industrial Personal Computer (IPC). Then, a bubble in the process of cavitation was selected and the 3-D reconstruction of this bubble was rendered by multi-mirrors about the obscured effect of spool. Finally, based on the case library of artificial intelligence CBR, some criteria had been used to co-determine bubble cavitation effect in terms of the critical values S, N and R of the bubble cluster shape, the number of bubbles, and the average size of the bubbles, respectively. When one parameter is larger than its critical value, the phenomenon of lighter cavitation appears. Meanwhile, when two or more parameters are larger than their critical values, serious cavitation is possible. In this study, the experimental results validated the feasibility of those criteria.