Optical diagnostics for high power pulsed underwater electrical discharge characterization

Deroy, Julien; Claverie, A.; Avrillaud, G.; Boustie, M.; Mazanchenko, Ekaterina; Assous, David; Chuvatin, Alexandre S.

doi:10.1088/1742-6596/500/14/142010

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…For nanosecond discharges, Grosse et al reported higher values [ 19 ]: the analysis of the expansion phase with cavitation theory estimated the initial pressure ranging from 10 9 to 20 × 10 9 Pa for a low initial radius (25 µm). For a high energy electrical discharge in water (1.5 kJ), Deroy et al [ 15 ] reported a maximum radius of 48 mm and an initial pressure of about 10 9 Pa. This high value is due to high storage energy, which also results in a larger bubble.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to providing significant steps toward a better comprehension of the mechanisms, these works have shown that the complexity of the discharge in liquid requires but also limits the use of various different diagnostics. The main tools are the refractive index methods for the discharge regime analysis [ 14 , 15 , 16 ] or emission spectroscopy for the determination of the chemically active species [ 17 , 18 ]. Very few works have reported a global study by coupling these diagnostics.…”

Section: Introductionmentioning

confidence: 99%

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Microsecond Electrical Breakdown in Water: Advances Using Emission Analysis and Cavitation Bubble Theory

et al. 2022

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Electrical discharges in water are a subject of major interest because of both the wide range of potential applications and the complexity of the processes. This paper aimed to provide significant insights to better understand processes involved during a microsecond electrical discharge in water, especially during the propagation and the breakdown phases. Two different approaches were considered. The first analysis focused on the emission produced by the discharge during the propagation using fast imaging measurements and spatially resolved optical emission spectroscopy. The excited species H, O, and OH were monitored in the whole interelectrode gap. The second analysis concerned the thermodynamic conditions induced by the breakdown of the discharge. The time evolution of the bubble radius was simulated and estimation of the initial pressure of the cavitation bubble was performed using the Rayleigh–Plesset model. Values of about 1.7 × 107 Pa and 1.2 × 108 Pa were reported for the cathode and anode regimes, respectively. This multidisciplinary approach constitutes a new step to obtain an accurate physical and chemical description of pin-to-pin electrical discharges in water.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microsecond Electrical Breakdown in Water: Advances Using Emission Analysis and Cavitation Bubble Theory

et al. 2022

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Experimental investigation of arc formation and bubble expansion initiated by pulse discharge in water

Liu

Lin

et al. 2015

2015 IEEE Pulsed Power Conference (PPC)

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Investigation of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires

Holzmüller

Homberg

2023

JMMP

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The pressure fields generated by two simultaneous discharges have not been investigated on any notable scale for the electrohydraulic impulse forming method. In this study, the synchronicity of two discharges is ensured by the sequential connection of two wires mounted in two spark gaps in a common volume of liquid. The objective is to experimentally confirm the equilibrium of the energies evolved in two spark gaps by means of pressure measurements. In addition, multipoint membrane pressure gauges demonstrated the feasibility of easily recording detailed pressure maps. Based on the membrane deformation mechanism and material strengthening under static and impulse conditions, the processing procedure is further developed so as to achieve better accuracy in the determination of pressure field parameters. The practical equality of the pressure fields on the left and right halves of the flat-loaded area confirms the equality of energies evolved in the two spark gaps. The direct shock waves create zones with the most intensive loading. These results provide a basis for the development of new electrohydraulic technologies involving the application of two simultaneous discharges with equal energy and pressure parameters.

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Optical diagnostics for high power pulsed underwater electrical discharge characterization

Cited by 3 publications

References 4 publications

Microsecond Electrical Breakdown in Water: Advances Using Emission Analysis and Cavitation Bubble Theory

Microsecond Electrical Breakdown in Water: Advances Using Emission Analysis and Cavitation Bubble Theory

Experimental investigation of arc formation and bubble expansion initiated by pulse discharge in water

Investigation of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires

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