NDLI: Ultimate kinematic characteristics of rail electromagnetic launchers with an external magnetic field

Content Provider	IEEE Xplore Digital Library
Author	Stankevich, S.V. Shvetsov, G.A.
Copyright Year	2013
Description	Author affiliation: Lavrentyev Inst. of Hydrodynamics, Novosibirsk, Russia (Stankevich, S.V.; Shvetsov, G.A.)
Abstract	Summary form only given. Thermal limitations due to currents are the main factors limiting the attainment of high projectile velocities and reducing th e life of rail electromagnetic launchers of solids. The heat load on the rails and the armature can be reduced by decreasing the current flowing through them, but this also reduces the electromagnetic accelerating force and the maximum velocities of solids of a given mass at a given distance of acceleration. One method of reducing the current through the rails and the armature without reducing the electromagnetic force acting on the armature is the use of the external magnetic field generated by the currents flowing in additional rails (coils) parallel to the main channel of the accelerator. This paper presents the results of a three-dimensional numerical simulation of Joule heating of the armature and rails in rail launchers with one or two additional rails producing an external magnetic field. The purpose of this study was to investigate the possibilities of reducing the Joule heating rate of the armatures during acceleration and increasing the ultimate (under heating conditions) kinematic characteristics of the launchers by selecting the optimal location of additional rails and optimizing the magnitude of the current pulse in them. The ultimate projectile velocity was calculated from the condition that the Joule heating temperatures of the armature and rails in the acceleration process are not higher than the melting point of the armature and rail materials. It is shown that by choosing the optimal location of the rails producing the additional magnetic field with respect to the accelerator channel and the magnitude of current in the m, one can greatly reduce the thermal limitations in electromagnetic launchers of solids with a metal armature and considerably increase the ultimate kinematic characteristics in crisis-free modes of operation.
Starting Page	1
Ending Page	1
File Size	88272
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6633272
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Rails Heating Magnetic fields Solids Acceleration Kinematics Electromagnetics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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