液相放电等离子体特性与激波特性的数值分析

以能量平衡方程为基础，采用不同的电导率唯象模型描述了液相放电等离子体圆柱形通道特性，得到了通道内半径、温度、电阻、电流和耗散能量随时间的变化关系，还给出了距离放电间隙中心一定距离处的冲击波压力变化，并与前人利用等离子体通道球状模型计算得到的结果进行了比较。结果表明:把等离子体通道看成球状和看成圆柱状在描述通道压力和通道半径时差异显著，而在描述其他物理特性时差别不大；三种电导率模型在描述等离子体通道物理特性时，变化趋势大体相同，而在描述激波特性时，电导率模型σ₂更符合实际；通过对比电学参数与压力参数的变化，就可以在实验中根据实验数据以及具体的研究问题进行模型的适用性选择。

Numerical analysis of plasma and shock wave characteristics of the discharge in liquid

Based on conservation equation of energy, channel characteristics of the cylindrical geometry of the plasma were described under different conductivity models. The variation of the channel radius, temperature, resistance, current and dissipated energy with time is obtained. The variation of shock wave pressure at a certain distance from the center of the discharge gap is also given. The results are compared with those calculated based on the spherical geometry of the plasma channel. The purpose of this paper is to provide a reference for further study of physical and chemical characteristics and shock wave characteristics of the discharge in liquid. The results show that there is significant difference in the channel pressure and radius when the plasma channel is respectively regarded as a sphere and a cylinder, but there is little difference in other physical properties. When the physical characteristics except the shock wave characteristic are described by using three conductivity models, the change trend is almost the same, while the shock wave characteristic is described more accurately by using the conductivity model σ₂. By comparing the changes of electrical parameters and pressure parameters, the applicability of the model can be selected according to the experimental data or specific research problems, which also provides a reference for further study of the physicochemical characteristics and shock wave characteristics of discharge plasma in liquid.