Optical diagnostics for high power pulsed underwater electrical discharge characterization

18th APS-SCCM; 24th AIRAPT

Deroy, J.^1 ; Claverie, A.^2 ; Avrillaud, G.^1 ; Boustie, M.^2 ; Mazanchenko, E.^2 ; Assous, D.^3 ; Chuvatin, A.^4

Bmax, 30 bd de Thibaud, Toulouse

31104, France^1

Institut PPRIME, UPR 3346, CNRS-ENSMA-University of Poitiers, B.P.40109, Futuroscope

86960, France^2

IDIL, Rue Claude Chappe, Lannion

22300, France^3

LPP, UMR 7648, CNRS-Ecole Polytechnique, Route de Saclay, Palaiseau Cedex

91128, France^4

关键词: Aluminum disks;    Electrical discharges;    High power;    Maximum pressure;    Optical diagnostics;    Pressure waves;    Pulsating bubbles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/14/142010/pdf
DOI  :  10.1088/1742-6596/500/14/142010

来源: IOP

【 摘 要 】

In order to evaluate the behavior of a high power pulsed underwater electrical discharge, and especially characterize the pressure generated by such a discharge, we implemented several optical diagnostics. We first observed directly the expansion of the plasma produced by the dielectric breakdown of the water between the electrodes and the resulting gaseous pulsating bubble. This observation led to an estimate of the pressure inside the bubble with respect to time. We then visualized the propagation of the pressure wave generated by the discharge with shadowgraph and Schlieren setup. The obtained velocity was then used to evaluate the theoretical maximum pressure at the pressure front. Finally, we measured the velocity induced by the pressure wave on a thin aluminum disk with a heterodyne velocimeter and used numerical simulation to obtain a temporal form of pressure. These methods and results can be used to develop and assess performances of processes using underwater electrical discharges to generate pressure waves such as electrohydraulic forming.