Title :
Forming of structures during wire array compression
Author :
Glazyrin, I.V. ; Eskov, N.S. ; Kotova, O.G. ; Shushlebin, A.N. ; Slesareva, A.N. ; Volkov, V.I.
Author_Institution :
Russian Fed. Nucl. Center, VNIITF, Chelyabinsk, Russia
Abstract :
Summary form only given. 2D radiation MHD simulations show that mass flows from separate wires join at the half of radius. To understand this phenomenon a sequence of 2D simulation runs have been done: 1) pure hydrodynamics without magnetic field and radiation transport; 2) including magnetic field; 3) including radiation transport. It is obtained that two factors plays an important role: development of hydroinstabilities (Kelvin, RT and RM) and "frozen-in" magnetic field. The "cold start" of separate wire explosion in an array has been the subject of interest in order to understand the implosion dynamics. Mass inflow dependence on initial distance between wires is analyzed. The complicated dynamic structure of exploded wire determines the mechanism of plasma entrainment from single wire towards the axis. The dense core formed at the axis of single wire is surrounded by liquid-vapor mixture with strong perturbations. Wide range equation of state accounting metastable properties and elastic-plastic properties of matter has been used. Calculations show that the mixture is the result of overheating instability. The interaction of shock wave generated by neighboring wire and media with different densities leads to MHD instabilities. Results of numerical simulation have been compared with experimental data obtained on generator ANGARA (TRINITI, Russia) and with the data calculated by using the model of delaying of plasma formation. Dependence of processes on power input rate has been estimated.
Keywords :
exploding wires; explosions; plasma heating; plasma instability; plasma interactions; plasma magnetohydrodynamics; plasma shock waves; plasma simulation; plasma thermodynamics; plasma transport processes; 2D radiation MHD simulations; ANGARA generator; MHD instability; TRINITI; core formation; elastoplastic properties; equation of state; explosion; frozen-in magnetic field; hydrodynamics; hydroinstability; implosion dynamics; liquid-vapor mixture; mass flows; metastable properties; numerical simulation; overheating instability; plasma formation; radiation transport; shock wave interaction; structure formation; wire array compression; Equations; Explosions; Hydrodynamics; Kelvin; Magnetic analysis; Magnetic fields; Magnetohydrodynamics; Plasma density; Plasma properties; 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.2004.1339606