Abstract
Atmospheric dielectric barrier discharges driven by tailored voltage waveforms are investigated numerically with a one-dimensional fluid model. We use the multi-frequency pulse-type voltage waveform as the control method and the harmonics N as the control parameter to control the number of discharge current pulses. The simulation results show that as N increases from 1 to 11, the number of discharge current pulses in each voltage half cycle (Np) decreases from 5 to 1, representing the transition from the multiple-current-pulse mode to the single-current-pulse (SCP) mode. In this process, both the current amplitude (Jpm) and the gap voltage of the first breakdown moment (Vgb) increase, and the efficiency of the plasma system can be improved by 5.6 times without reducing densities of reactive species. Further analysis reveals that the increase of Jpm is attributed to the variation in discharge current components, and the value of Vgb can be related to Np and the surface charge densities. Finally, an analytical method is proposed to estimate the minimum N to achieve the targeted SCP discharge. The results obtained in this work may contribute to the manipulation of power consumption and discharge stability in industrial applications.
Highlights
Under the simulation conditions described above, we first investigate the effect of multiple-frequency pulse-type voltage waveforms (MFPTVWs) on the discharge characteristics in an atmospheric homogeneous dielectric barrier discharge (APHDBD)
The use of voltage waveform tailoring to control the current pulse number in a dielectric barrier discharge (DBD) was investigated based on a 1D fluid model
The main conclusions are drawn as follows: (1) By using the multiple-frequency pulse-type voltage waveforms (MFPTVWs) in the simulation, we found that the number of harmonics (N) strongly affects the discharge current pulse number
Summary
Generations of low-temperature plasmas through dielectric barrier discharge (DBD) have been receiving extensive attention in both academic research and practical applications. The reactive species generated by DBDs are suitable for various applications: semiconductor manufacturing, pollution control, sterilization, and disinfection. Among various types of DBDs, atmospheric homogeneous dielectric barrier discharge (APHDBD) is widely praised as it exhibits uniform and stable discharge characteristics. Generally, only one current pulse appears during each applied voltage half cycle in APHDBD. We call it the single-current-pulse (SCP) discharge. previous studies have found that, in some conditions, two or more current pulses could appear in one voltage half cycle. This phenomenon, entitled the multiple-current-pulse (MCP) discharge, has been demonstrated to consume more power compared with SCP discharges. In addition, the oscillatory nature of the MCP discharge may be detrimental to applications that deal with sensitive materials. to make the DBD system more efficient and to avoid the adverse effects of MCP, it is necessary to propose an effective control method to convert this MCP discharge into the SCP mode. Only one current pulse appears during each applied voltage half cycle in APHDBD.20–24 We call it the single-current-pulse (SCP) discharge.. Previous studies have found that, in some conditions, two or more current pulses could appear in one voltage half cycle.25–30 This phenomenon, entitled the multiple-current-pulse (MCP) discharge, has been demonstrated to consume more power compared with SCP discharges.. On the basis of the above two studies, Zhang et al converted the MCP performance into a SCP mode by a clipped voltage waveform, providing an analytical method for the manipulation of MCP discharges.. We probe into the physical mechanism of the effect of MFPTVWs on MCP behaviors, and an analytical strategy is proposed in which the value of N can be estimated to obtain the targeted SCP discharge.
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