Blast mitigation by perforated plates using an explosive driven shock tube: study of geometry effects and plate numbers

Abstract This work is set in the context of blast mitigation based on geometric means, namely perforated metallic plates or grids. When a shock wave passes through plate, flow field modified, and new waves are created, as well regions vortices turbulence which energy can be dissipated. In this study, an explosive driven tube (EDST) was used to visualize interaction with piece cast foam. Additionally, overpressure impulse reflected wall located downstream were assessed. The use EDST allowed evaluation capacity under high dynamic loading. Several combinations tested, varying geometry number plates, switching between two different spacings. collided we observed that part incident by while remaining transmitted it. Downstream both reduced, effect being more prominent porosity decreased. placed obstacles, phenomenon reflection/transmission repeated twice consecutively, further reducing impulse. An array three foam even effective mitigating wave. Varying distance had no mitigation.