Interaction of a vortex ring with a perforated plate at different included angles

Vortex rings (VRs) are intriguing fluidic structures capable of self-propulsion once created. We experimentally investigate the behavior of a VR as it interacts with perforated plates set at different angles. Remarkably, a single VR splits into two distinct VRs when the included angle (\ensuremath{\theta} \ensuremath{\le} 120\ifmmode^\circ\else\textdegree\fi{}) is small. Moreover, using n-faced perforated surfaces makes it possible to generate multiple VRs from a single vortex. On the other hand, this process can be suppressed by adjusting the \ensuremath{\theta} values. The study explores key phenomena such as the growth of mushroom-shaped structures before interaction, the formation, and interaction of jets during the vortex impingement, and the subsequent reformation.