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利用Ｄａｍｋｏｈｌｅｒ准则判定水下等离子弧的流动性质，根据Ｓｔａｒｋ展宽法测量水下等离子弧的电子密度，并确定了等离子弧满足局部热力学平衡的范围和电流下限。
The flow properties of underwater plasma arc were determined by Damkohler criterion. The electron density of underwater plasma arc was measured by Stark broadening method. The range and the lower limit of current of plasma arc satisfying the local thermodynamic equilibrium were determined.