用于产生OH和O自由基的atmospheric pressure H2O/O2滑动弧等离子体的表征
Characterization of atmospheric pressure H2O/O2 gliding arc plasma for the production of OH and O radicals
摘要：
大气压蒸汽/氧等离子体由88 Hz、6 kV AC电源产生。利用光学发射光谱（OES）研究了产生的等离子体的性质。相对强度，转动，振动，激发温度和电子密度作为施加电压，电极间距和氧气流量的函数进行了研究。借助于LIFBASE模拟软件模拟谱带，确定了转动和振动温度。采用强度比法，考虑非热平衡条件，由CuI跃迁得到激发温度。用Voigt轮廓拟合法由H_α Stark展宽近似计算电子密度。据观察，旋转和振动温度降低与电极间距和O2流量的增加，但与所施加的电压增加。激发温度随外加电压和氧气流量的增加而增加，但随电极间距的增加而降低。电子密度随外加电压的增大而增大，随电极间距和O2流量的增大而呈下降趋势。
英文摘要：
Atmospheric pressure steam/oxygen plasma is generated by a 88 Hz, 6kV AC power supply. The properties of the produced plasma are investigated by optical emission spectroscopy (OES). The relative intensity, rotational, vibrational, excitation temperatures and electron density are studied as function of applied voltage, electrode spacing and oxygen flow rate. The rotational and vibrational temperatures are determined simulating the bands with the aid of LIFBASE simulation software. The excitation temperature is obtained from the CuI transition taking non-thermal equilibrium condition into account employing intensity ratio method. The electron density is approximated from the H_α Stark broadening using the Voigt profile fitting method. It is observed that the rotational and vibrational temperatures are decreased with increasing electrode spacing and O2 flow rate, but increased with the applied voltage. The excitation temperature is found to increase with increasing applied voltage and O2 flow rate, but decrease with electrode spacing. The electron density is increased with increasing applied voltage while it seems to downward trend with increasing electrode spacing and O2 flow rate.
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