作　　者： ; ; ; ; ; (屠昕）;

机构地区： 浙江大学机械与能源工程学院能源清洁利用国家重点实验室

出　　处： 《物理学报》 2011年第1期389-396,共8页

摘　　要： 对大气压直流滑动弧等离子体的电参数和发射光谱进行了测量,比较研究了不同气体种类下滑动弧等离子体电压的特性.以氮气滑动弧为例,分析了其在一个周期内电弧电压、电流、电阻和功率的变化特性.通过对电弧电压信号进行快速傅里叶变换频谱分析,研究了气体种类、气体流量和外部电阻值对滑动弧等离子体脉动特性的影响.结果表明随着气流量或外部电阻值的增加,其主要脉动频率变高,电弧周期变小.利用光谱法检测了氮气、氧气和空气滑动弧等离子体的主要自由基种类,并研究了外部电阻值对发射光谱强度的影响和沿电极中轴线在337.1nm(N2(C3Πu→B3Πg),Δv=0)处发射光谱强度的变化.结果表明发射光谱强度随外部电阻值增加而变小,沿电极中轴线先增加后减小,在等离子体区域外急剧减小. The atmospheric pressure dc gliding arc plasma was investigated through its electrical and optical signals. The arc voltages of various gas discharges were compared. The arc voltage,current,power and resistance of a nitrogen gliding arc in one period were studied. Influences of gas type,gas flow rate and external resistor on the gliding arc fluctuation behaviour were studied using FFT spectrum analysis. Increased main oscillation frequency was observed as gas flow rate or external resistance value increased. Furthermore,major radical species in nitrogen,oxygen and air discharges were determined by means of optical emission spectroscopy. Additionally,the effect of external resistor on the relative intensity of radical emission and axial distribution of relative intensity at 337. 1 nm （ N2 （ C3Πu →B3Πg ）,v = 0） were studied. Experimental results showed that radical emission relative intensity decreases with the increasing of external resistance value. The axial distribution of relative intensity exhibits the tendencies of increasing first and then decreasing. The radical emission relative intensity decreases dramatically out of the plasma area.

关 键 词： 滑动弧等离子体 非平衡等离子体 脉动特性 发射光谱

领　　域： [理学] [理学]