一种小功率孔形阳极喷嘴等离子体炬的研究

为了提高小功率等离子体炬的综合性能，本文作者研制了一种新型具有孔形阳极喷嘴的小功率等离子体炬，功率1~5kW。采用流体模拟计算的方法，计算了喷嘴出口附近射流的流场结构特点。通过实验分别测试了采用氩气、氮气作为工质气体时等离子体炬的运行电流和电压，观察了等离子体射流形态和电极烧蚀情况，通过测量等离子体射流前方中心轴线位置处的光谱的方法计算射流温度，采用气体分析仪测量了等离子体射流附近的二氧化氮浓度。测得的试验数据显示相同工质流率和电流条件下，氮气等离子体射流运行电压远高于氩气，而光谱测得氩气射流的温度远高于氮气。氮气等离子体射流和外界空气接触产生了少量的副产物二氧化氮（低于10mL/m3），而氩气等离子体射流附近无二氧化氮产生。

Low-Power Plasma Torch with Hole-Mouthed Anode

In order to upgrade the performance of the Low-Power Plasma Torch, the author of the paper developed an new-type Low-Power Plasma Torch with Hole-mouthed Anode, the power of the plasma torch is 1~5kW. Research of thermal flow field close-by anode nozzle of plasma jet is done through the numerical simulation. The voltage and current were measured with Gas-flow components such as Argon and nitrogen, the form of plasma jet and ablation of electrodes were observed, averaged temperature of plasma jet was measured by spectral analysis with spectrum right in front of plasma jet. The voltage of plasma jet of nitrogen exceeds Argon, but the temperature of plasma jet measured by spectrometer with Argon exceeds nitrogen. Gaseous by-products such as NO2 which generated from nitrogen-plasma jet and surrounding air was measured with concentration below 10 mL/m3, but no NO2 was measured from argon-plasma jet.