水中金属丝电爆炸冲击波一维数值模拟
One？？Dimensional Simulation for Shock Waves Generated by Underwater Electrical Wire Explosion

为了明确水中金属丝电爆炸冲击波的形成机理,基于经典活塞模型,采用相似参数法,引入双人工黏性系数,建立了水中金属丝电爆炸冲击波的一维计算模型。以等离子体放电通道边界膨胀轨迹作为模型唯一的输入参数,得到水中冲击波传播的时间与空间的分布规律,通过与其他文献实验结果的对比,验证了该计算方法的有效性。模拟结果表明,双人工黏性系数法使计算得到的冲击波更符合实际情况。爆炸初始时刻,等离子体放电通道边界膨胀压缩周围水介质产生的冲击波高达GPa级,冲击波压强峰值与径向传播距离的-0？？70次幂成正比关系。文中采用的计算方法既不涉及脉冲放电过程以及复杂的放电等离子体物理变化过程,也不涉及放电通道与水的物理化学作用过程,只需根据诊断实验得到放电通道边界膨胀轨迹,即可模拟水中金属丝电爆炸冲击波的产生与传播过程,对工程实践具有重要的指导意义。
To understand the formation mechanism of the shock waves (SWs) generated by underwater electrical wire explosion (UEWE), double artificial viscosities are introduced to establish one？？dimensional simulation model for SWs by UEWE based on classic piston model and similarity parameter method. In this simulation the trajectory of the discharge plasma channel (DPC) boundary serves as the unique input parameter, water pressure and SW velocity versus the distance from exploding wire and the period from exploding moment are obtained. The calculated results are compared with the experimental values from the other literatures to confirm the validity. The SWs calculated with double artificial viscosities method coincide well with the practical situation. At the explosion beginning the SW pressure reaches the grade of GPa at the DPC boundary, the obtained pressure amplitudes of SWs are found to be in direct proportion to the -0？？7 power of radial propagation distance. The calculating method does not involve the complicated processes of pulse discharge, physical changes of DPC, and physical？？chemistry interaction between DPC and water, only the DPC boundary trajectory obtained by experimental diagnostics is taken to simulate the generation and propagation processes of SWs generated by UEWE