Abstract
A two-dimensional self-consistent fluid model was employed to investigate the spatiotemporal nonlinear behavior in an argon glow-like/Townsend-like dielectric-barrier discharge (DBD) at atmospheric pressure. The discharge is characterized by a major current pulse with a residual one ahead per half cycle of the external voltage. The two current pulses are operated in glow mode, but with Townsend mode between them. Contrasting spatial discharge structures are complementarily presented not only at two current pulses in the same half cycle but also during the discharge in the two adjacent-half cycles, resulting in the formation of a unique nested complementary pattern each cycle. This peculiar behavior mainly lies in the fact that sufficient charged particles are trapped in the gas gap due to the last discharge and able to dominate the subsequent discharge through the “spatial memory effect”. The charge transport regime reveals that this nested complementary pattern is presented only in a limited range of driving frequency.
Highlights
The same half cycle and in the two adjacent-half cycles, which here is defined as a nested complementary pattern formation
We report the first simulation results that unambiguously demonstrate that there are contrasting spatial discharge structures complementarily presented at two adjacent current pulses in the same half cycle and during the discharge in the two adjacent-half cycles in an argon dielectric-barrier discharge
The contour line is added in some subfigures
Summary
The same half cycle and in the two adjacent-half cycles, which here is defined as a nested complementary pattern formation. This discharge is characterized by a major current pulse with a residual one ahead. The spatial discharge structure in the negative half cycle is just opposite to that in the positive half cycle, the current pulse is symmetric in the two adjacent-half cycles. This behavior is closely associated with the residual discharge that has been identified both in simulations and in experiments[14,15,16]. All efforts of this work are to gain insights into this spatiotemporal nonlinear behavior and obtain the physical mechanism behind the nested complementary pattern formation
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