Effects of rod radius and voltage on streamer discharge in a short air gap

Fu, Yuwei; He, Mengsha; Chen, Chi; Wang, Chuang; Zhang, Zaiqin

doi:10.1088/2058-6272/acc16c

Cited by 4 publications

(2 citation statements)

References 42 publications

(36 reference statements)

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“…Hence, a higher voltage amplitude leads to a greater velocity. References [24][25][26] also obtained the same results through experiments and simulations.…”

Section: Comparison With Previous Findingssupporting

confidence: 59%

Dynamic propagation velocity of a positive streamer in a 3 m air gap under lightning impulse voltage

LI 李,

LEI 雷,

SU 苏

et al. 2024

Plasma Sci. Technol.

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Streamer is an important stage in the initiation of gap discharge. In this work, we used an 8-frame intensified charge coupled device (ICCD) camera to capture the streamer development process when the lightning impulse voltage of 95%–100% U50% was applied in a 3 m rod-plate gap, and the streamer velocity was analyzed. By analyzing the observations, the streamer velocity is defined as three stages: rapid velocity decline (stage 1), rapid velocity rise (stage 2) and slow velocity decline (stage 3). The effects of electrode shape, applied voltage, gap breakdown or withstand on streamer velocity were analyzed. The electrode with a larger curvature radius will result in a higher initial velocity, and a higher voltage amplitude will cause the streamer to propagate faster at stage 3. Gap withstanding or breakdown has no obvious effect on streamer velocity. In addition, the experimental results are compared with the previous results and the statistical characteristics of the primary streamer discharge were discussed.

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“…Hence, a higher voltage amplitude leads to a greater velocity. References [24][25][26] also obtained the same results through experiments and simulations.…”

Section: Comparison With Previous Findingssupporting

confidence: 59%

Dynamic propagation velocity of a positive streamer in a 3 m air gap under lightning impulse voltage

LI 李,

LEI 雷,

SU 苏

et al. 2024

Plasma Sci. Technol.

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show abstract

“…The research above shows that a DC corona shows different behavior under conditions of specific natural environments and environmental meteorological parameters (temperature, humidity, air pressure, rain, high altitudes, etc. ), which have an important and complex impact on the corona discharge of conductor surfaces [12][13][14]. As for corona discharge occurring at the tip defects of wire surfaces, there are, however, few studies focused on the influence of the geometric structures of tip defects on a corona discharge.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

Wang,

Mai,

Wang

2023

Applied Sciences

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For investigating the relationship between the surface corona discharge of a DC wire and other influencing factors, a hybrid numerical model based on a fluid-chemical reaction was proposed to simulate the discharge process at the tip defect of the wire. Under different defect geometries and gas pressures achieved via simulation, the microscopic process of the reaction and movement of electrons and heavy particles during a positive corona discharge was studied, and characteristic parameters such as corona inception voltage and discharge current were analyzed. Furthermore, through the corona cage test, for a specific electrode configuration, corona inception voltages under different pressures were compared and verified, which showed that the model was reasonable. The results showed that the maximum electron density of the streamer head was about 1 × 1020 m−3, the rise time of the pulse current was about 10 ns, and the decay time was about 300–500 ns. The corona inception voltage decreased with an increase in the tip height and decreases in the tip curvature radius, conductor radius, and background air pressure; the amplitude of the pulse current increased with increases in the wire radius and curvature radius of the defect tip and decreases in tip height and background air pressure. The experimental results are consistent with the simulation results, which verifies the reasonability of the model.

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Effects of spatiotemporal plasma power distribution on the modeling of ignition kernel evolution in quiescent and turbulent methane/air mixtures

Johnson,

Taneja,

Yang

2024

J. Phys. D: Appl. Phys.

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The present work improves a phenomenological plasma-assisted combustion model by integrating the spatiotemporal distribution of plasma power density, thereby considering the evolution of plasma streamers in the modeling, and subsequently, better predicting the ignition kernel evolution. The improved phenomenological model is validated against experiments representing the plasma discharge and post-discharge ignition kernel evolution. Specifically, the new model demonstrates a more accurate prediction of ultra-fast gas heating and O2 dissociation during the plasma discharge, compared to the original model. In addition, the new model is found to closely match the experimental pressure wave and heated channel profiles post-discharge without the need for tuning the energy deposition (unlike the original model), highlighting its accuracy of post-discharge ignition kernel dynamics. The improved phenomenological model is then employed to investigate ignition kernel evolution for a stoichiometric methane-air discharge across various discharge gap configurations. Simulations reveal a non-uniform temperature and streamer distribution progressing from the electrode tips toward the center, contrasting uniform cylindrical discharges previously described in the original model. Streamer propagation is observed to be faster for larger gaps when maintained at the same average electric field for different discharge gaps. The tendency of smaller gaps to produce detached toroidal ignition kernels is observed, while larger gaps promote cylindrical and attached ignition kernels. Interactions between successive ignition kernels from consecutive discharges varied significantly, with the smallest gap (1 mm) promoting the quenching of the preceding ignition kernel due to the initial kernel-kernel separation. The intermediate gap (2 mm) promotes detached kernel growth. In contrast, in the largest gap (4 mm), kernels consistently combine and expand attached to electrodes. The impact of homogeneous isotropic turbulence is also explored, showing the persistence of ignition kernels early on but eventually quenching due to enhanced radical and heat losses with pronounced turbulence intensity.

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Effects of rod radius and voltage on streamer discharge in a short air gap

Cited by 4 publications

References 42 publications

Dynamic propagation velocity of a positive streamer in a 3 m air gap under lightning impulse voltage

Dynamic propagation velocity of a positive streamer in a 3 m air gap under lightning impulse voltage

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

Effects of spatiotemporal plasma power distribution on the modeling of ignition kernel evolution in quiescent and turbulent methane/air mixtures

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