金属桥箔水中电爆炸流场数值模拟研究

Numerical Simulation of Electric Exploding of Metal Bridge Foil in Water

研究金属桥箔水中电爆炸等离子体特征及其流场变化规律,建立了桥箔水中电爆炸过程的多相流数值计算模型和计算方法。采用相变分数,实现了金属从固相到气相的质量传递计算。利用Saha电离平衡方程计算了等离子体的电离度,给出了考虑粒子数目变化及粒子间库仑作用的等离子体状态方程。对桥箔水中电爆炸过程进行了数值模拟计算,获得了桥箔电爆炸等离子体及冲击波形状特征,给出了桥箔水中电爆炸流场压力、温度、密度及速度等重要参数的变化规律。

In order to study the characteristics of plasma and the flow field evolution laws of the metal bridge foil electric exploding in water,a multiphase flow calculation model is established. The mass transfer of metal from solid phase to plasma phase is achieved by using phase volume fraction in calculation,and the ionization degree of plasma is calculated by Saha equation. The plasma equation of state is determined,taking into account the effect of the changing number of particle and the Coulomb interaction on the pressure and internal energy. Numerical simulation of the exploding process of metal bridge foil electric in water is carried out. The characteristics of the plasma and shock wave shape are obtained,and the important parameters of the electric explosion flow field,such as pressure,temperature,density and velocity,are given.