Atmospheric pressure dielectric barrier discharges (DBD) have gained great interests due to their extensive application prospects, and one of the most key investigations lies in the generation of uniform and stable discharge. It is generally believed that a stable diffuse discharge is apt to be formed in short-gap helium DBD devices. However, based on previous experimental investigations, temporal nonlinear phenomena including asymmetry, period multiplication, and chaos can be observed in short-gap helium DBD under certain operating conditions. Therefore, we constructed a one-dimensional fluid model on atmospheric helium DBD with short gap distance to study the evolution progresses and characteristics of temporal nonlinear phenomena induced by the varying of applied voltage’s amplitude. Compared with previously reported models, this model includes more complex plasma chemistry, and the calculated discharge waveforms agree well with experimental measurements. The results show that, with the increasing of the applied voltage’s amplitude, the discharges will successively go through period one symmetric discharge, period one asymmetric discharge, period two discharge, chaos, period three discharge, and finally return to the stable period one symmetric discharge. Further analyses indicate that every single discharge pulse includes the transition from Townsend-like discharge to glow discharge, consequently, it appears as a steep sharp peak. Before the ignition of a discharge pulse, the residual positive column derived from the last glow discharge is proved to be completely dissipated. Since it is commonly believed the residual positive column plays a vital role in the transitions of nonlinear phenomena in large gap DBD, results concluded from our simulations imply the formation and evolution of nonlinear phenomena in the short gap DBD may be contributed to a more subtle mismatch between the generation and quenching of electron and ions.
12]的对比
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图2
计算电流波形与相同条件下实验测量波形[12]的对比
Fig.2
Waveform comparison between the calculated current and experimental measurements in the same condition[1,2]
图7
Uap=2 280 V时的P3放电
Fig.7
P3 discharge at Uap=2 280 V
图8
放电状态随Uap升高的演化过程
Fig.8
Evolution of discharge states with Uap rising
图9
P3放电中一个完整重复周期内总电流密度、气隙电压、外施电压及介质层内表面电荷密度的波形(Uap=2 280 V)
Fig.9
Waveforms of total current density, gap voltage, applied voltage and surface charge density on the walls of dielectrics in a complete repeat cycle in P3 discharge (Uap=2 280 V)
图11
P3放电中关键放电时刻的电子-离子数密度以及电场强度的空间分布(Uap=2 280 V)
Fig.11
Spatial distributions of electron density, ion density and electric field at the key discharge moments in P3 discharge (Uap=2 280 V)
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