Abstract
A systematic investigation on the dynamics and evolution mechanisms of multiple-current-pulse (MCP) behavior in homogeneous dielectric barrier discharge (HDBD) is carried out via fluid modelling. Inspecting the simulation results, two typical discharge regimes, namely the MCP-Townsend regime and MCP-glow regime, are found prevailing in MCP discharges, each with distinctive electrical and dynamic properties. Moreover, the evolution of MCP behavior with external parameters altering are illustrated and explicitly discussed. It is revealed that the discharge undergoes some different stages as external parameters vary, and the discharge in each stage follows a series of distinctive pattern in morphological characteristics and evolution trends. Among those stages, the pulse number per half cycle is perceived to observe non-monotonic variations with applied voltage amplitude (Vam) and gap width (dg) increasing, and a merging effect among pulses, mainly induced by the enhanced contribution of sinusoidal component to the total current, is considered responsible for such phenomenon. The variation of incipient discharge peak phase (Φpm) is dominated by the value of Vam as well as the proportion of total applied voltage that drops across the gas gap. Moreover, an abnormal, dramatic elevation in Jpm with dg increasing is observed, which could be evinced by the strengthened glow discharge structure and therefore enhanced space charge effect.
Highlights
There have been tremendously growing interests in homogeneous dielectric-barrier discharge (HDBD) operated at atmospheric pressure due to its immense potentials for numerous industrial applications, such as surface modification,[1,2] biomedical sterilization[3,4,5] and pollution control.[6]
Increasing voltage amplitude (V am) ranging from 0.8 kV to about 1.2 kV leads to a rise in pulse number per half cycle (Np), in the meantime the phase of discharge epoch encounters an observably forward shifting, as shown in Figure 2(b), (c)
Elevating V am after exceeding about 2.8 kV, the waveform of current density is prone to stabilize, exhibiting a sinusoidal characteristic with a wide single pulse per half cycle, as shown in Figure 2(f), while the peak phase of the current pulse tends to stabilize in the vicinity of 0 in this process
Summary
There have been tremendously growing interests in homogeneous dielectric-barrier discharge (HDBD) operated at atmospheric pressure due to its immense potentials for numerous industrial applications, such as surface modification,[1,2] biomedical sterilization[3,4,5] and pollution control.[6] Typically, the temporal waveform of atmospheric HDBD is characterised by one narrow current pulse per half cycle of applied voltage under traditional parallel-plate discharge structure.[7,8,9] in many cases, HDBDs with 2 or more current pulses per half cycle is perceived This phenomenon, entitled ‘multiple current pulses (MCP) discharge’,10 or ‘pulsed regime diffuse discharge’,11 ‘pseudo-glow discharges’,12 was convinced and studied in massive previous reports.[7,10,11,12,13,14,15,16,17,18].
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