Model of shock-wave magnetic cumulation

Abstract

A shock-wave magnetic cumulation technique is used to generate a megagauss magnetic field in an aluminium powder under quasi-cylindrical geometry. A magnetohydrodynamic (MHD) model of shock-wave magnetic cumulation is proposed. The model is based on the Oh–Persson equation of state and experimental data on electrical conductivity of powders. The 1D simulation reveals the features of the MHD flow under converging of the cylindrical shock wave. The experimental record of the magnetic field in the generator is in reasonable agreement with simulation results. This fact validates the model and allows one to optimize the cumulation system for producing a higher magnetic field.

Reaction Delay of Aluminum in Condensed Explosives

“…Shock compression causes a high degree of distortions of the aluminum particles [16] that can lead to the creation of cracks of the oxide film [17] allowing external high temperature oxidizing gases to come into contact with the underlying aluminum core in multiple locations. This and the increase in particle surface temperature induced by the high rate of heat transfer are likely to be the main mechanisms of initiation of reaction of aluminum particles in the detonation reaction zones of condensed explosives.…”