Title :
Analysis of Magnetohydrodynamic Simulation Results of Explosive Current Opening Switch Operation
Author :
Demidov, Vasily A. ; Vlasov, Yuri Valentinovich
Author_Institution :
Sci. & Tech. Center of Phys., Russian Fed. Nucl. Center-All-Russian Res. Inst. of Exp. Phys., Sarov, Russia
Abstract :
Explosive and electroexploded opening switches (EEOSs) are used for current sharpening of magnetocumulative generators (MCGs). The EEOSs are well studied both in calculations and experimentally; the explosive opening switches (EOSs) have been studied mostly experimentally. Calculation and theoretical studies of the explosive current opening switches have been carried out by means of phenomenological model building or in 2-D gas-dynamic approximation. The mentioned approaches have some limits, and they do not allow completely revealing the complicated pattern of physical phenomena taking place during the opening switch operation. Whereas it is necessary to optimize the EOSs, it is almost impossible to solve this problem completely at expensive full-scale explosive experiments. The 2-D numerical magnetohydrodynamic simulation of the processes is very close to the reality. This paper compares calculation and experimental data on the circuit breaking of the MCG using the explosive current opening switch with the ribbed barrier. Investigation results of the electric circuit parameters, opening switch construction, and linear density of the breaking current dependence on the load current pulse characteristics are presented. Possible reasons of differences in calculation and experimental results are shown; ways of improvement of the calculation model and opening switch optimization are outlined.
Keywords :
magnetohydrodynamics; pulsed power supplies; pulsed power switches; EEOS; MCG circuit breaking; electric circuit parameters; explosive and electroexploded opening switches; explosive current opening switch operation; magnetocumulative generators; magnetohydrodynamic simulation; opening switch construction; opening switch optimization; ribbed barrier; Earth Observing System; Explosives; Inductance; Magnetohydrodynamics; Resistance; Switches; Switching circuits; Characteristic current rise time; explosive current opening switch; magnetocumulative generator (MCG); magnetohydrodynamic (MHD) simulation; ribbed barrier; ribbed barrier.;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2014.2362683