弧电压对等离子射流温度脉动的影响

电弧等离子体射流中的湍流是等离子体射流的典型物理现象之一。射流的脉动将直接影响射流温度的脉动，而以往的研究认为射流存在一个处于稳定状态的核心区域，本文采用电弧等离子体光谱诊断及数字高速摄影的方法对常压电弧等离子体射流进行了研究，采用了傅立叶变换的方法分析弧电压和射流光谱强度信号，发现电源的交流分量和阳极弧点运动对整个射流的脉动特性都有影响。射流并不存在一个处于稳定状态的核心区域，相反从谱线强度脉动与弧电压脉动的FFT分析图中可以看到，射流的脉动主要是由电弧电压的脉动造成的。

The Influence of Arc Voltage on Temperature of Plasma Spraying Jet

The turbulence phenomenon is one of the most attractive characteristics of a DC arc plasma spraying jet.Most of the previous investigations believe that there is a laminar flow region in the core of the jet.A spectrum diagnostic system has been built up in this paper to investigate these effects with the aid of high speed digital camera.The FFT method has been applied to the analysis on the arc voltage and light signals.The influence of the arc behavior and the power supply on the jet is full scale.It seems that there is not a laminar flow region in the core of the jet.Moreover,from the graphs of FFT analysis,the jet fluctuation due to the arc voltage behavior maybe is the dominant characteristic of the jet behavior.