Wave-Cutting Efficiency and Mechanism of Single-Tube Multi-Row Hole Bubble Curtain

To further optimize the wave-cutting efficiency of bubble curtain, field tests on underwater explosion shock wave attenuation using single-tube multi-row bubble holes and high-speed photography observations of bubble curtain morphology were designed. Additionally, the numerical calculation model for equivalent thickness of bubble curtain was studied using AUTODYN software. The results indicate that, under the same air flow rate, the number of bubble hole rows is a critical factor affecting wave-cutting efficiency. At a detonation center distance of 12m, the wave-cutting efficiencies for 1, 2, and 3 rows of holes are 89.92%, 97.25%, and 96.41%, respectively. At different detonation center distances, the cutting efficiency of the two-row hole bubble curtain is the best, and the cutting efficiency is all greater than 95.00%. Both the thickness and density of the bubble curtain are maximized with 2 rows of holes, and the thickness of the bubble curtain is the key factor determining wave-cutting efficiency. The equivalent thickness fitting formula established by combining experiments and simulations has high reliability, and the simulation model exhibits high accuracy. It is suggested that similar projects adopt single-tube 2-row hole bubble curtain to achieve convenient, efficient and low-cost wave-cutting efficiency.