Meng Xueping, Lei Bin, Xiang Hongjun, Lü Qing'ao, Huang Xu. Effect of pulsed current of coil on pinching characteristics of shaped charge jet[J]. Explosion And Shock Waves, 2017, 37(5): 923-928. doi: 10.11883/1001-1455(2017)05-0923-06
Meng Xueping, Lei Bin, Xiang Hongjun, Lü Qing'ao, Huang Xu. Effect of pulsed current of coil on pinching characteristics of shaped charge jet[J]. Explosion And Shock Waves, 2017, 37(5): 923-928. doi: 10.11883/1001-1455(2017)05-0923-06
In the present study, to analyze how the parameters of the coil's pulsed current affect the pinching characteristics of the shaped charge jet (SCJ), theoretical models considering the induced current density, the magnetic flux intensity and the pinching electromagnetic force distribution of uneven SCJ in the coil's pulsed current were established, a finite element model of the SCJ and the coil was built, and the effect of the pulsed current parameters of the magnetic exciting coil on the SCJ was analyzed. The results show that as the pulsed current amplitude of the coil increases, so do the induced current density, the magnetic flux density and the pinching electromagnetic force of the SCJ, that the effective deformation of the SCJ occurs only when the pulsed current density amplitude through the coil is bigger than 1×1010 A/m2, and that with the increase of the pulsed current frequency of the coil, the induced current density, the magnetic flux density and the pinching electromagnetic force of the SCJ show a certain degree of the skin effect, and the skin layer gradually becomes thinner within a certain frequency range. Analysis shows that it is when the pulsed current frequency of the coil is between 50 kHz and 100 kHz that the effective deformation of the SCJ can be ensured, thereby delaying its breakage process.
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