Simulational analysis on electromagnetic field evolution in launching process of a series enhanced electromagnetic railgun based on the moving-window method

WANG Ganghua; XIE Long; ZHAO Hailong; KAN Mingxian; XIAO Bo; HE Yong; SONG Shengyi

doi:10.11883/bzycj-2020-0156

Volume 41 Issue 6

Jun. 2021

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WANG Ganghua, XIE Long, ZHAO Hailong, KAN Mingxian, XIAO Bo, HE Yong, SONG Shengyi. Simulational analysis on electromagnetic field evolution in launching process of a series enhanced electromagnetic railgun based on the moving-window method[J]. Explosion And Shock Waves, 2021, 41(6): 064201. doi: 10.11883/bzycj-2020-0156

Citation:

WANG Ganghua, XIE Long, ZHAO Hailong, KAN Mingxian, XIAO Bo, HE Yong, SONG Shengyi. Simulational analysis on electromagnetic field evolution in launching process of a series enhanced electromagnetic railgun based on the moving-window method[J]. Explosion And Shock Waves, 2021, 41(6): 064201. doi: 10.11883/bzycj-2020-0156

Citation:

WANG Ganghua, XIE Long, ZHAO Hailong, KAN Mingxian, XIAO Bo, HE Yong, SONG Shengyi. Simulational analysis on electromagnetic field evolution in launching process of a series enhanced electromagnetic railgun based on the moving-window method[J]. Explosion And Shock Waves, 2021, 41(6): 064201. doi: 10.11883/bzycj-2020-0156

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Simulational analysis on electromagnetic field evolution in launching process of a series enhanced electromagnetic railgun based on the moving-window method

doi: 10.11883/bzycj-2020-0156

Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2020-05-20
Rev Recd Date: 2020-09-28

Available Online: 2021-04-21

Publish Date: 2021-06-05

Abstract

Abstract

It is very important to simulate and analyze the evolution of the electromagnetic field on the armature/rail in the electromagnetic emission process for optimizing and improving the design of the rail and armature, which is the main basis for controlling the temperature rise of the rail, armature and armature transition. Series enhanced trajectory design is an effective way to improve projectile initial velocity and launch efficiency under the condition of inherent energy storage. In this design, the magnetic field strength on the armature is increased through the series current of the circuit, thus improving the emission ability. A mathematical and physical model is established for the series enhanced orbit. The main control equations of the Railgun3D program are briefly introduced in this paper. The moving window FE/BE Hybrid simulation method is adopted to simulate the series reinforced railgun. This method can make more efficient use of computer resources and focus the simulation on the vicinity of the rail/armature interface. The evolution process of the electromagnetic field of a complex rail/armature under trapezoidal driving current is analyzed in detail. Due to the existence of the enhanced orbit, the driving current produces a large magnetic field on the enhanced orbit. Due to electromagnetic induction, the corresponding induced current will be generated on the inner orbit, that is, there are significant magnetic field and current distribution on the orbit at one end of the muzzle. The magnitude of the induced current depends on the change rate of the driving current. The distribution of current direction near the armature at several times is given, and the evolution process of the current vortex structure is observed. In the current drop section, the results of current reversal on the surface behind the armature are given. It is pointed out that this effect may be an important factor leading to insufficient contact stress between the armature and the track, and even the occurrence of armature transition. Through the current density nephogram on the central symmetry plane, the simulation results show the competition mechanism between magnetic diffusion and velocity skin effect in the whole process.
- electromagnetic railgun,
- current vortex,
- velocity skin effect,
- armature transition,
- Railgun3D program,
- moving-window method

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References(22)

References

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