Current Concentration of Large-Caliber C-Shaped Armature in Square Railgun


Compared with small- and medium-caliber railguns, large-caliber railguns (LCRs) could be applied in a lot of occasions. Armatures for LCRs may be designed consistent with studies on small- and medium-caliber railguns, yet there are some distinctive features of the design. Current concentration could be a special phenomenon in LCR systems, where it is a lot of severe because of high energy density and large current. For a giant-caliber armature (LCA) that has the same muzzle speed as small-caliber armatures (SCAs), that guarantees the identical velocity skin effect, the skin effect and also the induced current are studied and need to be considered as the main influence factors. During this paper, the present distribution and concentration between LCA ( mm) and SCA ( mm) are studied and compared. This distribution coefficients of those 2 armatures are obtained, and it's shown that current density in giant armature is a lot of targeted than the tiny one. The proportions of induced current to the entire current for mm and mm armatures are obtained, which indicate that the induced current is the main reason for current concentration in LCA. At last, measures to enhance current distribution in LCAs are discussed.

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