摘要
为了有效控制电弧边界层电子温度,获得既能高效率产生NO、又能尽量不产生NO2的最合适电弧温度,利用光学多通道分析仪测量了不同气体体积流量下的脉冲电弧放电等离子体发射光谱;根据激发原子的玻耳兹曼分布公式,计算了不同条件下的等离子体电弧温度;在测量光谱的同时,同步测量了体积分数φ(NO)、φ(NO2)及其比值φ(NO2)/φ(NO),分析了等离子体温度对体积分数φ(NO)、φ(NO2)及其比值φ(NO2)/φ(NO)的影响。结果显示,可以采用光学多通道摄谱仪记录的各发光谱线的强度求解脉冲电弧放电的等离子体温度;脉冲电弧放电等离子体的温度随着气体体积流量的增加而呈非线性变化;体积分数φ(NO)、φ(NO2)及其比值φ(NO2)/φ(NO)与等离子体温度呈非线性关系,可能与不同气体体积流量下等离子体密度和电子温度的空间分布不同有关。
In order to control electron temperature of arc boundary-layer effectively, and to obtain the most suitable arc temperature which can generate NO efficiently but inhibit NO2 to the greatest extent, emission spectra Of pulsed arc discharge plasma at different gas flows were measured by using optical muhichannel analyzer, and the plasma temperature of different discharge conditions was calculated by using Boltzmann equation. At the same time, the concentration of NO, NO2 and the ratio of NO2/NO on-line were detected, and the relationship between plasma temperature and the concentration of NO, NO2 and the ratio of NO2/NO was analyzed. The conclusions are drawn that the temperature of pulsed arc discharge plasma can be calculated by emission spectra recorded by using optical muhichannel analyzer, the temperature of pulsed arc discharge plasma is not linearly related with the gas flow, and the concentrations of NO, NO2 and the ratio of NO2/NO are not linearly related with the temperature of pulsed arc discharge plasma, which may depend on space distribution of plasma density and electron temperature at different gas flows.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第2期319-323,共5页
High Voltage Engineering
基金
国家自然科学基金(50677026)
华中科技大学校基金项目(J2007M036B)~~
关键词
一氧化氮
电弧放电
发射光谱
等离子体
温度
计算
nitric oxide
arc discharge
emission spectra
plasma
temperature
calculation
