Effect of cathode surface properties on glow-to-arc transition in a short positive corona gap in ambient air

Černák, Mirko; Veldhuizen, van Em Eddie; Morva, I.; Rutgers, WR Wijnand

doi:10.1088/0022-3727/28/6/015

Cited by 25 publications

(16 citation statements)

References 18 publications

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“…However, this estimation can only represent a lower bound estimate for the arc formation time. The breakdown to arc transition is a complex multistage process that also involves a transient glow discharge phase and cathode spot formation [31]. Nonetheless, the derived range of values agrees well with typical spark arc transition times for discharges using sparkplugs under the investigated conditions [32].…”

Section: Figure 6 Discharge Schematicssupporting

confidence: 72%

Experimental Analysis of Breakdown With Nanosecond Pulses for Spark-Ignition Engines

et al. 2021

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The influence of pulse rise rate and pulse duration for ignition purposes in engines is investigated. A constant volume cell is used to characterize the breakdown voltage under nanosecond pulsed voltages with automotive sparkplugs having electrode gaps ranging from 0.2 mm to 1 mm. Two pulse generators are used to compare pulses with durations of 10 ns and 50 ns. Different pulse amplitudes are used, and air gaps with breakdown voltages ranging from 4 kV to 15 kV are investigated. The cell is filled with synthetic air with densities gap distances products that are relevant for internal combustion engines. This study shows that the pulse shape and rise rate influence the breakdown voltage. Under pulsed discharge, the breakdown voltage is always above the static breakdown voltage. The probability of pulsed discharge breakdown increases as both the pulse amplitude and duration increases. Furthermore, the breakdown voltage value increases with increasing pulse rise rate. The delay time between reaching the static breakdown voltage and the actual breakdown voltage decreases with increasing overvoltage. The delay time is constituted by statistical and formative times. Both the statistical and formative times decrease with increasing overvoltage. For ignition purposes, the pulse rise rate should be as high as possible to deliver a larger energy input in the breakdown phase. Furthermore, for reduced electrode erosion, the pulse duration should be short (10-20 ns) to reduce the probability for a transition to an arc.

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Section: Figure 6 Discharge Schematicssupporting

confidence: 72%

Experimental Analysis of Breakdown With Nanosecond Pulses for Spark-Ignition Engines

et al. 2021

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“…However, the arc transition time had 2-ns uncertainty. This jitter has already been observed before [26]. Fig.…”

Section: (Nm)supporting

confidence: 60%

On the arc transition mechanism in nanosecond air discharges

Minesi

Stepanyan

Mariotto

et al. 2019

AIAA Scitech 2019 Forum

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“…The time delay τ br between the bridging of the gap and spark formation is one of the main characteristics of the streamer-to-spark transition. Measured in [5,6] values of τ br in short non-uniform gaps in atmospheric-pressure air decrease steeply with growth of the applied voltage, that is, with growth of the mean reduced electric field in the gap. Simulation of the streamer-to-spark transition in air gaps at relatively high values of E m /N , when the breakdown occurs in the nanosecond time range, has been performed in [2] with account of the kinetic mechanism only.…”

Section: Introductionmentioning

confidence: 93%