Convergence of shock waves generated by underwater electrical explosion of cylindrical wire arrays between different boundary geometries

摘要

The results of experiments and numerical simulations of a shock wave propagating between either conical or parabolic bounding walls are presented. The shock wave was generated by a microsecond timescale underwater electrical explosion of a cylindrical wire array supplied by a current pulse having an amplitude of similar to 230 kA and a rise time of similar to 1 mu s. It is shown that with the same energy density deposition into the exploding wire array, the shock wave converges faster between parabolic walls, and as a result, the pressure in the vicinity of convergence is similar to 2.3 times higher than in the case of conical walls. The results obtained are compared to those of earlier experiments [Antonov et al., Appl. Phys. Lett. 102, 124104 ( 2013)] with explosions of spherical wire arrays. It is shown that at a distance of similar to 400 mu m from the implosion origin the pressure obtained in the current experiments is higher than for the case of spherical wire arrays. (C) 2015 AIP Publishing LLC.