电弧等离子体射流中的脉动是等离子体射流的典型物理现象之一。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核进行了研究 ,采用了Fourier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核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 ,从谱线强度脉动和弧电压脉动的 FFT分析图中可以看到 ,射流核的脉动是由电弧电压脉动及电弧分流现象共同造成的 ,这可能是射流核脉动的最主要原因。等离子体射流的高速摄影照片表明 ,等离子体喷枪的功率也对射流的脉动特征有着重要的影响 Pulsation in an arc plasma jet is one of the typical physical phenomena of a plasma jet. The arc plasma spectroscopy diagnosis and digital high-speed photography were used to study the atmospheric arc plasma jet nuclei. The Fourier transform method was used to analyze the arc voltage and the jet spectrum intensity signals. The alternating current component of the power source and the motion of the anode arc spot The pulsation characteristics of the entire jet core have an impact, and the jet does not exist in a stable core region. On the contrary, from the FFT analysis of line intensity pulsation and arc voltage pulsation, it can be seen that the pulsation of the jet nucleus is caused by arc voltage pulsation and arc shunt phenomenon, which may be the most important reason of jet pulsation. High-speed photographic images of the plasma jet show that the power of the plasma torch also has a significant effect on the pulsation characteristics of the jet