Observation of spiral pattern and spiral defect chaos in dielectric barrier discharge in argon/air at atmospheric pressure
Observation of spiral pattern and spiral defect chaos in dielectric barrier discharge in argon/air at atmospheric pressure
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DOI：
10.1103/physreve.72.046215
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发表时间：
2005-10-01
影响因子：
2.4
通讯作者：
Fan, WL
中科院分区：
文献类型：
--
作者：
Dong, LF;Liu, FC;Fan, WL
在交流大气压气体放电中观察到了单臂螺旋、偶极螺旋、靶向螺旋、多臂螺旋和螺旋缺陷混沌等多种螺旋花样。在放电区域中，分别以是否存在侧壁作为约束边界条件和自由边界条件。在自由边界条件下，当条纹图案经历核不稳定性或缺口不稳定性时，出现螺旋图案。在有限边界条件下，螺旋斑图是由侧壁强迫形成的。在自由边界条件下，螺旋线向上漂移，在受限边界条件下，螺旋线则蜿蜒曲折。当螺旋线与位错相互作用时，螺旋线的拓扑电荷会发生变化。螺旋波长（两个连续辊之间的平均距离）是气体成分的函数，并且随着放电气体中空气浓度的增加而迅速减小。
A rich variety of spiral patterns such as single-armed spiral, dipole spirals, target pattern, multiarmed spiral, and spiral defect chaos state have been observed in ac-driven atmospheric pressure gas discharge. The confined and free boundary conditions are defined by means of whether there is a sidewall in the discharge domain or not, respectively. In the free boundary condition, the spiral pattern arises when the stripe pattern undergoes core instability or notching instability. In the confined boundary condition, the spiral pattern is formed by sidewall forcing. The spiral drifts upward in the free boundary condition and meanders in the confined boundary condition. The topological charge of the spiral pattern can be changed when the spiral interacts with the dislocations. The spiral wavelength (average distance between two consecutive rolls) is a function of gas composition and decreases rapidly with increase of air concentration in discharge gas.