Rotational and Vibrational Temperature Distributions for a Dielectric Barrier Discharge in Air
Rotational and Vibrational Temperature Distributions for a Dielectric Barrier Discharge in Air
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DOI：
10.2514/1.37648
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发表时间：
2009-05
期刊：
影响因子：
2.5
通讯作者：
S. Stanfield;J. Menart;C. Dejoseph;R. Kimmel;J. Hayes
中科院分区：
文献类型：
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作者：
S. Stanfield;J. Menart;C. Dejoseph;R. Kimmel;J. Hayes
利用发射光谱法得到了非对称表面模式介质阻挡放电中N + 2的旋转和振动温度以及N + 2的旋转温度随电压的变化规律。通过非线性最小二乘拟合得到了两温度理论谱与n2 （c3 Π u - b3 Π g）和N + 2 （b2 Σ + u - x2 Σ + g）电子带系统的实测谱的旋转温度。采用玻尔兹曼图法对n2 （c3 Π u - b3 Π g）电子能带系统的Δv = - 2序列进行了振动温度的计算。我们观察到n2 ？N + 2在诱导流动方向上减小，随着电压的升高而增大。N + 2从390±10 K开始，降至340±10 K； N + 2从500±15 K开始，降至450±15 K。在诱导流动方向上，振动温度从3250降至2850±300 K。在研究的所有电压下，n2和N + 2之间的旋转温度都存在差异，并且这些差异随着电压的增加而增加。两种植物的旋转温度沿展向波动。这些波动在流方向上减弱，并且与暴露电极边缘的微放电附着点弱相关。
Spatially resolved rotational and vibrational temperatures for N 2 and rotational temperatures for N + 2 , as a function of voltage, have been obtained for an asymmetric surface mode dielectric barrier discharge using emission spectroscopy. The rotational temperatures were obtained from a nonlinear least-squares fit of a two-temperature theoretical spectrum with the measured spectra of the N 2 (C 3 Π u ― B 3 Π g ) and N + 2 (B 2 Σ + u ― X 2 Σ + g ) electronic band systems. The vibrational temperatures were obtained by applying the Boltzmann plot method to the Δv = ―2 sequence of the N 2 (C 3 Π u ― B 3 Π g ) electronic band system. It was observed that the rotational temperatures for N 2 ? and N + 2 decreased in the induced flow direction and increased with increasing voltage. Values started at 390 ± 10 K and decreased to 340 ± 10 K for N 2 and started at 500 ± 15 K and decreased to 450 ± 15 K for N + 2 . The vibrational temperatures also decreased in the induced flow direction from 3250 to 2850 ± 300 K. A difference in rotational temperatures between N 2 and N + 2 was observed for all voltages studied, and these differences increased with increasing voltage. The rotational temperatures of both species fluctuated in the spanwise direction. These fluctuations damped out in the streamwise direction and were weakly correlated with the attachment points of the microdischarges on the edge of the exposed electrode.