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

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 ∼230 kA and a rise time of ∼1 μs. 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 ∼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 ∼400 μm from the implosion origin the pressure obtained in the current experiments is higher than for the case of spherical wire arrays.
Authors:
; ;  [1] ;  [2]
  1. Physics Department, Technion, Haifa 32000 (Israel)
  2. Center for Energy Research, National Laboratory Astana, Nazarbayev University, Astana 010000, Republic of Kazakhstan (Kazakhstan)
Publication Date:
OSTI Identifier:
22486445
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; COMPUTERIZED SIMULATION; CONVERGENCE; CYLINDRICAL CONFIGURATION; DEPOSITION; ENERGY DENSITY; EXPLODING WIRES; EXPLOSIONS; IMPLOSIONS; PULSE RISE TIME; PULSES; SHOCK WAVES; SPHERICAL CONFIGURATION; UNDERWATER; WALLS