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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。首先深入分析水下等离子弧现象，找出相应的物理量来刻划等离子弧的稳定过程，并在对该物理量进行统计分析的基础上，提出表证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因素，探讨提高等离子弧稳定性的措施。
From the point of view of the interaction between water and plasma arc, the stability of shallow-water plasma arc system is systematically studied. Firstly, the phenomenon of submerged plasma arc is analyzed in depth, and the corresponding physical quantities are found out to characterize the stability of the plasma arc. Based on the statistical analysis of the physical quantities, the stability index of plasma arc is presented, which is the voltage stability factor. And then find out the factors that cause the instability of the plasma arc and discuss the measures to improve the stability of the plasma arc.