Research on the characteristics of atmospheric air dielectric barrier discharge under different square wave pulse polarities

Jiang, Song; Huang, Lifei; Wu, Zhonghang; Wang, Yonggang; Zi, Li; Rao, Jun

doi:10.1088/2058-6272/ac2b11

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…These measures all serve to prevent excessive discharge intensity, thereby averting the formation of filamentary streamer discharges. Therefore, more efforts have been devoted to obtaining uniform DBD by selecting power supplies [14], working gases [15] and dielectric materials [16], and optimizing electrode structures [17] and operation conditions [18]. Fan et al established a bipolar pulse power supply through electrode optimization, using the charged particles generated by dielectric surface pre-ionization to enhance discharge uniformity [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of dielectric material on the uniformity of nanosecond pulsed dielectric barrier discharge

ZHOU 周,

ZHANG 张,

DUAN 段

et al. 2024

Plasma Sci. Technol.

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Dielectric barrier discharge (DBD) is considered as a promising technique to produce large volume uniform plasma at atmospheric pressure, and the dielectric barrier layer between the electrodes plays a key role in the DBD processes and enhancing discharge uniformity. In this work, the uniformity and discharge characteristics of the nanosecond (ns) pulsed DBD with dielectric barrier layers made of alumina, quartz glass, polycarbonate (PC), and polypropylene (PP) are investigated via discharge image observation, voltage-current waveform measurement and optical emission spectral diagnosis. Through analyzing discharge image by gray value standard deviation method, the discharge uniformity is quantitatively calculated. The effects of the space electric field intensity, the electron density (Ne), and the space reactive species on the uniformity are studied with quantifying the gap voltage Ug and the discharge current Ig, analyzing the recorded optical emission spectra, and simulating the temporal distribution of Ne with a one-dimensional fluid model. It is found that as the relative permittivity of the dielectric materials increases, the space electric field intensity is enhanced, which results in a higher Ne and electron temperature (Te). Therefore, an appropriate value of space electric field intensity can promote electron avalanches, resulting in uniform and stable plasma by the merging of electron avalanches. However, an excessive value of space electric field intensity leads to the aggregation of space charges and the distortion of the space electric field, which reduce the discharge uniformity. The surface roughness and the surface charge decay are measured to explain the influences of the surface properties and the second electron emission on the discharge uniformity. The results in this work give a comprehensive understanding of the effect of the dielectric materials on the DBD uniformity, and contribute to the selection of dielectric materials for DBD reactor and the realization of atmospheric pressure uniform, stable, and reactive plasma sources.

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Section: Introductionmentioning

confidence: 99%

Effect of dielectric material on the uniformity of nanosecond pulsed dielectric barrier discharge

ZHOU 周,

ZHANG 张,

DUAN 段

et al. 2024

Plasma Sci. Technol.

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“…Although the occurrence of MD seems to be temporally and spatially disordered, the appearance of MD repeats within a fixed area for hundreds of half-periods (HPs) caused by the residual charges in the discharge zone and on the dielectric surface during the dielectric barrier discharge (DBD) process [15,16]. Recently, researchers have investigated the effects of the gas composition, the shape of the applied voltage, and the arrangement of the DBD reactor on the features of MDs, such as the radius of the discharge channel, the streamer velocity, and the discharge current [17][18][19][20][21][22][23]. Despite the investigation into the MD's features in previous studies, it is still necessary to conduct further research into the behaviors of an individual MD to develop an efficient and suitable DBD reactor.…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulated investigation of microdischarge characteristics in a pin-to-pin dielectric barrier discharge (DBD) reactor

He¹,

Peng²,

Jiang³

et al. 2022

Plasma Sci. Technol.

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Both experimental and simulated studies of the micro-discharge (MD) are carried out in a DBD with a pin-to-pin gap of 3.5 mm, ignited by a sinusoidal voltage with a peak voltage of 10 kV and a driving frequency of 5 kHz. A statistical result has shown that the probability of the single current pulse in the positive half-period (HP) reaches 73.6% under these conditions. Experimental results show that the great intensity of the luminous is concentrated on the dielectric surface and the tip of the metal electrode. A one-dimensional (1D) plasma fluid model is implemented by coupling the species continuity equations, electron energy density equations, Poisson equation, and Helmholtz equations to analyze the MD dynamics on the micro-scale. The simulated results are in good qualitative agreement with the experimental results. The simulated results show that the MD dynamics can be divided into three phases: the Townsend phase, the streamer propagation phase, and the discharge decay phase. During the streamer propagation phase, the electric field and electron density increase with the streamer propagation from the anode to the cathode, and their maximal values reach 625.48 Td and 2.31×1019 m−3 as well as 790.13 Td and 3.58×1019 m−3 in the positive and negative HP, respectively. Furthermore, a transient glow-like discharge is detected around the anode during the same period of the streamer propagation. The formation of transient glow-like discharge is attributed to electrons drifting back to the anode, which is driven by the residual voltage between the air gap.

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Research on the characteristics of atmospheric air dielectric barrier discharge under different square wave pulse polarities

Cited by 2 publications

References 25 publications

Effect of dielectric material on the uniformity of nanosecond pulsed dielectric barrier discharge

Effect of dielectric material on the uniformity of nanosecond pulsed dielectric barrier discharge

Experimental and simulated investigation of microdischarge characteristics in a pin-to-pin dielectric barrier discharge (DBD) reactor

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