Abstract
In this paper two-dimensional (2D) numerical simulations have been carried out taking into account the effects of different layered armatures on melt-wave erosion (MWE) in electromagnetic launcher. A 2D model is developed and the finite difference method is utilized to solve the unsteady magnetic diffusion and heat transfer equations simultaneously. The results indicate that erosion occurs at the rear corner of the armature and spread along the armature/rail (A/R) interface. Three different layered armatures are used to prevent MWE and delay the onset of the transition. The inverse L-shaped layered pattern shows the best performance. Important electrothermal and geometrical parameters of the contact layer are analyzed through comparing the erosion time, erosion distance and maximum temperature. It is observed that a protective layer with high electrical conductivity and thermal conductivity is useful to restrain the spread of MWE. The results are inspiring and contribute to the armature design.
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