Experimental assessment of local thermodynamic equilibrium in VKI Plasmatron air plasma jet
Experimental assessment of local thermodynamic equilibrium in VKI Plasmatron air plasma jet
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VKI Plasmatron 空气等离子体射流局部热力学平衡的实验评估
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. André
中科院分区：
文献类型：
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作者：
D. Lequang;Y. Babou;P. André
通过光学发射光谱诊断方法研究了由 VKI Plasmatron 在 500 kW 和 16 g.s ―1 下运行、压力范围 100―300 mbar 产生的亚音速空气等离子体射流的热力学状态。在距离测试室出口 16 厘米处，在可见光谱范围内以 0.066 nm 的分辨率记录 N 和 O 原子谱线。假设局部热力学平衡 (LTE) 和仅热平衡所获得的温度非常吻合，表明等离子体在约 10000 K 的温度下接近热平衡。然而，从在加入少量水的初始空气混合物上测量的 H β 线展宽开始确定的电子密度约为 10 21 m ―3 ，略低于 LTE 计算的密度，与经历复合的等离子体类似。
The thermodynamic state of subsonic air plasma jet, produced by VKI Plasmatron operating at 500 kW and 16 g.s ―1 , in the pressure range 100―300 mbar, is investigated by means of optical emission spectroscopy diagnostics. The N and O atomic lines were recorded, in the visible spectral range at resolution of 0.066 nm, at 16 cm away from the outlet into the test chamber. The temperatures obtained assuming Local Thermodynamic Equilibrium (LTE) and only thermal equilibrium were found to agree quite well, indicating that the plasma is close to thermal equilibrium at temperature of about 10000 K. However electron densities, determined starting from H β line broadening measured on initial air mixture seeded with a small amount of water, were found to be about 10 21 m ―3 , slightly lower than the densities calculated at LTE, similarly to plasma undergoing recombination.