Title :
Effect of the thermal instability on the conductor electrical explosion
Author :
Baksht, R.B. ; Oreshkin, V.I. ; Ratakhin, N.A. ; Rousskich, A.G. ; Labetsky, A.Yu. ; Shishlov, A.V. ; Levashov, P.R. ; Khitscheno, K.V. ; Beilis, I.I.
Author_Institution :
Inst. of High Current Electron., Acad. of Sci., Tomsk, Russia
Abstract :
Summary form only given. An electrical explosion of thin metal wires at a current rise time of several tens of nanoseconds and at a current density of /spl sim/10/sup 8/ A/cm/sup 2/ was studied. The experimental results with the LC generator (67 nF, 730 nH) at the 5-20 kV voltage are described and compared with the simulation ones. Simulation model used a wire explosion based on the matter phase transfers. A two-dimensional magnetohydrodynamic code based on the particle-in-cell method is used to consider the formation of striations and a low-density plasma corona surrounding the wire. The striations are shown to occur through evolving overheat instabilities early in the explosion, when the conductor material is in the liquid or two-phase states. The process owes to the decrease in liquid metal conductivity with temperature increasing and density decreasing. Comparison between the experiment and simulation demonstrates the acceptable coincidence.
Keywords :
current density; exploding wires; liquid metals; plasma density; plasma instability; plasma magnetohydrodynamics; plasma simulation; plasma transport processes; thermal stability; 5 to 20 kV; conductor electrical explosion; current density; liquid metal conductivity; low-density plasma corona; particle-in-cell method; thermal instability effect; thin metal wires; two-dimensional magnetohydrodynamic code; wire explosion; Conducting materials; Conductors; Current density; Explosions; Magnetohydrodynamic power generation; Plasma density; Plasma temperature; Thermal conductivity; Voltage; Wire;
Conference_Titel :
Plasma Science, 2004. ICOPS 2004. IEEE Conference Record - Abstracts. The 31st IEEE International Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-8334-6
DOI :
10.1109/PLASMA.2004.1339962