水中电爆炸放电通道特性0维数值模拟

Zero-dimensional Simulation of Discharge Channel Properties During Underwater Electrical Wire Explosion

为研究水中金属丝电爆炸现象的物理过程,建立了一种简单、易于工程应用的描述水中金属丝电爆炸放电通道等离子体特性的数值模拟方法。该方法基于理想流体力学方程组,采用非连续传播理论描述放电通道与水的作用过程,金属等离子体电导率采用美国Sandia国家实验室数据,状态方程采用理想气体状态方程,依据Tucker电阻率-比作用量模型与Sariksov 0维热力学模型估算等离子体通道初始状态。以已有实验数据作为输入条件进行了计算,结果表明:所提出模型的计算结果与文献实验结果、磁流体力学模型计算结果一致性较好;计算得到电爆炸过程形成的等离子体放电通道压强、温度、膨胀速度分别可达6 GPa、3 eV、1 100 m/s。

To understand the physical mechanism of underwater electrical wire explosion （UEWE）, we established asimple and practical numerical simulation method to describe the hydrodynamics properties of discharge plasma channel（DPC） in UEWE. The model is based on the ideal hydrodynamics equation set, and uses the arbitrary discontinuity prop-agation theory to describe the interaction between DPC and surrounding water. In the simulations, electrical conductivitydata obtained from America Sandia National Laboratories and ideal equation of state （EOS） were adopted, and the Tuckerresistivity-specific action model and Sariksov 0-D thermodynamical （ThD） model were introduced to calculate the initialstate of DPC. Moreover, some reported experimental data were used as the input in the simulation, and the results calcu-lated using the proposed model were in good accordance with the existed experimental data and MHD simulation results.In addition, according to our simulation, the pressure, temperature, and expansion velocity of DPC reach up to 6 GPa, 3eV, and 1 100 m/s, respectively.