Abstract
Enhancing the inductance gradient of an electromagnetic railgun (EMRG) directly translates to an improvement in the force on the projectile. Fileting the rails on one side is one of the ways to improve the inductance gradient. This work focuses on the effects of filet arc radius on different parameters of inductance gradient, current density distribution, magnetic flux density, barrel efficiency, breech energy, and critical velocity. The performance of rails with filet arc radius of 2, 4, and 6 mm are compared with the conventional cuboid shape rail geometry. Dynamic field distributions are analyzed by simulating the designed systems in LS-DYNA. A magneto-static analysis is performed using Ansys-Maxwell to determine the magnetic flux density produced behind the armature. It is observed that there is an increase in the flux density and barrel efficiency when filet radius increases. An improvement of 3.81% is observed in the flux density and the barrel efficiency improved from 24% in conventional rails to 27% in rails with a filet radius of 6 mm.
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