Field-emitting Townsend regime of surface dielectric barrier discharges emerging at high pressure up to supercritical conditions
Field-emitting Townsend regime of surface dielectric barrier discharges emerging at high pressure up to supercritical conditions
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DOI：
10.1088/0963-0252/24/2/025021
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发表时间：
2015-03
影响因子：
3.8
通讯作者：
D. Pai;S. Stauss;K. Terashima
中科院分区：
文献类型：
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作者：
D. Pai;S. Stauss;K. Terashima
实验研究了10 kHz交流激励下大气压至超临界CO2气体的表面介质阻挡放电。使用电流-电压和电荷-电压测量，成像，光发射光谱，和自发的拉曼光谱，我们确定和表征的场发射汤森放电制度，出现在0.7 MPa以上。一个电气模型，使放电引起的等离子体和电介质的电容，以及空间平均值的表面电位和跨放电的电位降的计算。在电路模型中，通过包括由于来自电极边缘的边缘电场而引起的电容来考虑空间平均拉普拉斯场。证明了电特性符合大气压汤森DBD的描述（Naudé等人，2005年，物理学杂志，D：应用物理学，38 530-8），即具有最小空间电荷效应的自持DBD。纯连续发射光谱是由于电子中性韧致辐射，对应于平均电子温度为2600 K。CO2在临界点附近的拉曼光谱表明，气体平均温度升高不到1 K。
Surface dielectric barrier discharges (DBDs) in CO2 from atmospheric pressure up to supercritical conditions generated using 10 kHz ac excitation are investigated experimentally. Using current–voltage and charge–voltage measurements, imaging, optical emission spectroscopy, and spontaneous Raman spectroscopy, we identify and characterize a field-emitting Townsend discharge regime that emerges above 0.7 MPa. An electrical model enables the calculation of the discharge-induced capacitances of the plasma and the dielectric, as well as the space-averaged values of the surface potential and the potential drop across the discharge. The space-averaged Laplacian field is accounted for in the circuit model by including the capacitance due to the fringe electric field from the electrode edge. The electrical characteristics are demonstrated to fit the description of atmospheric-pressure Townsend DBDs (Naudé et al 2005 J. Phys. D: Appl. Phys. 38 530–8), i.e. self-sustained DBDs with minimal space-charge effects. The purely continuum emission spectrum is due to electron–neutral bremsstrahlung corresponding to an average electron temperature of 2600 K. Raman spectra of CO2 near the critical point demonstrate that the average gas temperature increases by less than 1 K.