Efficiency of the shock wave generation caused by underwater electrical wire explosion

Abstract

Shearing interferometry, together with shadowgraph and Schlieren photography techniques, has been applied for the visualization of the cylindrical water flow behind the shock wave generated by high-power 6 GW nanosecond time-scale underwater electrical discharge. The flow was visualized during the first microsecond of the wire explosion process in the region between the expanding exploding wire discharge channel and the shock wave. The optical methods, combined with the hydrodynamic calculation, enable an accurate estimation of the energy transferred from the discharge to the water flow. The estimated efficiency of the transformation of the electrical dissipated energy to the mechanical energy of the generated compressed water flow is ∼15%.

Generation of cylindrically symmetric converging shock waves by underwater electrical explosion of wire array

“…In addition, one can see that the use of a cylindrically converging SW allows one to obtain almost approximately ten times increase in the pressure at the axis as compared with the SW pressure at the same distance from the individual exploding Cu wire of 100 m diameter and 100 mm in length. 6 In conclusion, the generation of converging cylindrical flow by the cylindrical multiwire array was investigated. The purpose of the research was to determine the conditions under which the initially corrugated SW front may be stabilized and considered cylindrically symmetric.…”

Aluminum micro-particles combustion ignited by underwater electrical wire explosion

“…First, let us calculate the distance that the rod propagates during its acceleration, considering that the exploding wire energy is transferred to the mechanical energy of water at a ∼20 % efficiency rate [20,21]. When ∼3 kJ of the energy is deposited into the copper wire, one obtains E W = 600 J of mechanical energy transferred in the water volume V tot = 2 × 10 −6 m 3 inside the dielectric tube.…”

High-energy-density physics researches based on heavy ion accelerator and pulse power devices

“…The evolution of electrical conductivities is directly estimated from voltage-current characteristics of the wire explosion. Compared with previous research [1][2][3], we intended to make a semi-empirical approach to the exploding wire plasma. That is to say, as the structure and the hydrodynamics of HED plasma are dominated by the EOS and their transport coefficient, we can discuss those values from the comparison.…”

“…Matters in a warm dense (WD) state can be produced by a wire explosion in water using a small, cylindrically arranged pulse power generator [1,2]. The plasma is tamped by the surrounding water, and cylindrically evolves from a solid state to a plasma through a WD and/or strongly coupled state accompanied by a shock wave in water.…”