从水与等离子弧相互作用的角度出发,系统地研究浅水下等离子弧的稳定性。深入分析了水下等离子弧现象,找出相应的物理量来刻画等离子弧过程中的行为,并在对该物理量进行系统分析的基础上提出表征等离子弧稳定程度的指标——电压稳定性因子,进而找出造成等离子弧不稳定的主要原因,提出了改进 From the point of view of the interaction between water and plasma arc, the stability of shallow-water plasma arc system is systematically studied. In-depth analysis of the underwater plasma arc phenomenon, to find out the corresponding physical quantity to describe the behavior of the plasma arc process, and on the basis of the systematic analysis of the physical quantities on the basis of the characterization of plasma arc stability indicators - voltage stability factor, and thus To find out the main reason that caused the instability of plasma arc and put forward the improvement