Affiliations: [a] College of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China | [b] Beijing Institute of Electronic System Engineering, Beijing 100854, China | [c] National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
Correspondence:
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Corresponding author: Fei Gong, National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China. Tel.: +86 25 8431 5932; Fax: +86 25 8431 5644; E-mail:gongf@njupt.edu.cn
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.
