中心杆式等离子体发生器瞬态时变模型分析

Analysis of the Transient Time-varying Model of the Discharge Rod Plasma Generator

中心杆式等离子体发生器(DRPG)为开口系统,建立了考虑膛内气相回流进入DRPG的瞬态时变模型来仿真DRPG工作过程。通过对比电流、电阻曲线,验证了模型的精确性。由瞬态时变模型仿真得到DRPG中等离子体温度、速度、密度和压力。根据DRPG中等离子体参数的变化,可将电爆炸后DRPG工作过程简化为稳定输出和振荡输出两个阶段。电爆炸后,DRPG处于稳定输出阶段,等离子体流入膛内;在振荡输出阶段,随着膛内压力的增加,存在等离子体流出DRPG或膛内气相回流进入DRPG的现象。回流入DRPG的气相与等离子体混合,使得等离子体温度下降,等离子体密度增加,DRPG等效电阻上升。

The discharge rod plasma generator（ DRPG） is an open system. A transient time-varying model（ TTVM）,including the influence of the gas flowing back into the DRPG,was built to simulate the working process of the DRPG. Through a comparison of the measured current and resistance curves,the accuracy of the TTVM was proved. Depending on the TTVM,plasma temperature,velocity,density and pressure in the DRPG can be obtained through simulation. According to the change of the simulated plasma parameters,the working process after the wire explosion can be simplified as steady flow-out stage and oscillation flow-out stage. After the wire explosion in the steady flow-out stage,the velocity of the plasma is positive,and the plasma flow into the chamber. In the oscillation flow-out stage,the phenomenon of flow-out plasma or flowing-back gas appears with the increase of the gas pressure in the chamber. Because of the mixing of flow-back gas and plasma,the temperature of the plasma decreases,while the density of the plasma and the resistance of the DRPG increase.