7th International Conference on Matter and Radiation at Extremes (ICMRE2024)

The bubble pulsation from underwater explosion can produce the pressure wave and the following flow, which can destroy the whole structure of ships. The experimental study on the evolution of underwater explosion bubbles was carried out by underwater exploding wire. Bubble generation and pulsating behavior are the focus of the study, as well as the energy characteristic. The experimental facility is mainly composed of two parallel energy storage-discharge modules and a water tank. Each module is composed of two 20 μF capacitors and a gas switch located between the capacitors in series. A copper wire with a diameter of 0.9 mm and a length of 50 mm is used as the load. The experimental results show that most of the stored energy can be deposited in water. The wire plasma expansion produces an initial bubble with temperature radially spatial distribution. The times of bubble pulsation are less than 4. Most of the bubble energy is dissipated during the first pulsation. After energy exhaustion, bubbles collapse directly into water because the main component is metal vapor. The radius trajectory of the first bubble pulsation differs slightly from the theoretical motion model, the main reason for which may be that the explosion shock wave reflects on the inner wall of the tank, suppressing the expansion of bubbles.
 

underwater explosion,bubbles,underwater electrical wire explosion,bubble pulsation