Effects of water addition on OH radical generation and plasma properties in an atmospheric argon microwave plasma jet
Effects of water addition on OH radical generation and plasma properties in an atmospheric argon microwave plasma jet
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DOI：
10.1063/1.3632970
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发表时间：
2011-09
影响因子：
3.2
通讯作者：
N. Srivastava;Chuji Wang
中科院分区：
文献类型：
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作者：
N. Srivastava;Chuji Wang
在连续常压氩微波等离子体射流进料气中加入水蒸气，研究水蒸气对等离子体形状、等离子体气体温度和OH自由基浓度的影响。等离子体射流由2.45 GHz微波等离子体源产生，工作功率为104 W， H2O-Ar混合物流速为1.7标准升/分钟（slm）。当H2O/Ar比值从0.0增加到1.9%时，等离子体射流柱长从11 mm减小到4 mm，当H2O/Ar比值高于1.9%时，等离子体射流变得不稳定；在等离子体温度420 ~ 910 K范围内，等离子体气体温度升高至330 K。发射光谱分析表明，在纯Ar等离子体射流中，随着水蒸气的加入，主导等离子体发射从N2变为OH，发射光谱模拟表明，OH a态（v′=0）的旋转能级呈非玻尔兹曼分布。沿等离子体射流轴的空间分辨绝对OH数密度为…
Water vapor was added to the feeding gas of a continuous atmospheric argon (Ar) microwave plasma jet to study its influence on plasma shape, plasma gas temperature, and OH radical concentrations. The plasma jet was created by a 2.45 GHz microwave plasma source operating at constant power of 104 W with H2O-Ar mixture flow rate of 1.7 standard liter per minute (slm). With an increase in the H2O/Ar ratio from 0.0 to 1.9%, the plasma jet column length decreased from 11 mm to 4 mm, and the plasma jet became unstable when the ratio was higher than 1.9%; elevation of plasma gas temperature up to 330 K was observed in the plasma temperature range of 420-910 K. Optical emission spectroscopy showed that the dominant plasma emissions changed from N2 in the pure Ar plasma jet to OH with the addition of water vapor, and simulations of emission spectra suggested non-Boltzmann distribution of the rotational levels in the OH A-state (v'=0). Spatially resolved absolute OH number densities along the plasma jet axis were me...