直流双阳极等离子体特性的研究

Research on Characteristics of a DC Double-Anode Arcs Plasma Torch

利用高性能数字示波器、发射光谱法以及热力学方法,对直流双阳极等离子体发生器的伏安特性、射流的温度与射流的比焓特性进行了实验研究.结果表明,当等离子体的工作气体为纯氩气时,其弧压随电流的增加显著升高,且不随气体流量的增加而单调地变化;当工作气体为氩氮混合气体时,弧压随氮气的比例增加而急剧增大;氩等离子体射流的比焓随着电流的增大而增大,随着氩气流量的增加而减少;在相近的条件下氩氮等离子体射流的比焓远大于纯氩等离子体射流的比焓;氩等离子体射流在出口处的温度超过10000 K.

An experime specific enthalpy of a ntal study on characteristics of the current-voltage, the electron temperature and the DC double - anode arcs plasma jet were conducted based on thermodynamic methodology with emission spectrum diagnosis using high performance oscillometer （OSC）. The result reveals when the gaseous medium was pure argon the arc voltage increased solely without influence by variation of argon flow rate, and if the gaseous medium was a mixture of argon - nitrogen then the arc voltage was raised dramatically with the increased nitrogen portion in the mixture. The specific enthalpy of argon plasma jet became higher as the increased current and lower as the increased portion of argon. The specific enthalpy of argon-nitrogen plasma was much higher than that of argon plasma alone under similar conditions. At the exit of plasma torch, the electronic （exciting） temperature of argon plasma jet exceeded 10000 K.