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| One dimensional magneto-hydrodynamic simulation of magnetically driven flyer plates |
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| DOI：10.7511/jslx20086145 |
| KeyWord:magnetic driving,one dimensional magneto-hydrodynamics,simulation,high velocity flyer plates |
| WANG Gui-ji JIANG Ji-hao SUN Cheng-wei TAN Fu-li ZHANG Ning MO Jian-jun |
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| Abstract: |
| The technique of magnetically driven flyer plates is a new one developed for experiments in recent years,and it is applied in the field of shock wave physics.The process is accompanied by magnetic diffusion which causes the Joule heating,and the phase states of the flyer near the loading surface varied which determined the range of the thickness of the flyer.Based on the Lagrangian coordinates,one dimensional magneto-hydrodynamic simulation of magnetically driven flyer plates is done with the equations of magneto-hydrodynamics,equation of electrical resistivity and database of equation of states(EOS).The distributions of density and temperature of Aluminum flyer along Lagrangian coordinates for different times are obtained,and the relationship of magnetic diffusion velocity varying with loading current densities is gained.For the equation of the electrical resistivity chosen here,it can only describe the state of the flyer before vaporization points and can not describe the subsequent process such as plasma forming,which needs universal equation of electrical resistivity.A turning point appears during the process of magnetic diffusion velocity varying with the loading current densities,and the relationships can be expressed with two linear equations before and after the turning point.According to the results above and knowledge of shock wave physics,the choice of the thickness of magnetically driven flyer plates is studied. |
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