不同脉冲电流下水中铜丝电爆炸特性的实验研究

An experimental study of optical emission and pressure waves generated by an exploding copper wire in a water medium was performed. By changing circuit parameters, pulsed currents with different rising rate were obtained to explode the wires under the same discharge type. Load voltage, circuit current, shock wave pressure, and time-integrated spectra were recorded and analyzed. Deposited energy and reconstructed shock waves were also calculated. Experimental results indicate that the rising rate of a pulsed current has a significant effect on the underwater electrical wire explosion phenomenon. In an experiment, with an initial stored energy of 500J, a 100μm-diameter, 2cm-long copper wire was respectively exploded by two pulsed currents with an average rising rate of 66.1A/ns and 7.7A/ns. The deposited energy at the voltage peak of the two cases was 18.6eV/atom and 10.3eV/atom, respectively. The peak pressure was 7.6MPa and 7.0MPa, respectively. The largest optical emission appeared around the end of the discharge and lasted for dozens of micro-seconds. These results demonstrate that a faster rising rate of a current results in more energy deposited before the wire explosion and less energy deposited after the voltage collapse, resulting in a stronger optical emission, leading to the shock waves with a larger peak pressure and smaller decay time constant. It is hoped that this study will aid in better understanding accompanied phenomena of UEWE and act as a reference for related applications.