Periodical discharge regime transitions under long-term repetitive nanosecond pulses

Zhao, Zheng; Li, Chenjie; Zheng, Xinlei; Sun, Anbang; Li, Jiangtao

doi:10.1088/1361-6595/ac6050

Cited by 12 publications

(20 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traditionally, the NRP discharge stabilizes into either the corona regime or the successive spark regime after inception, probably due to abundant charge revisors and the surplus heat [7]. In contrast, our recent experiments have illustrated another nonintuitive instability: that the negative NRP discharge can periodically swing among different regimes in a long pulse train [21]. The initial corona gradually grows into the spark pulse by pulse as predicted, nevertheless, the following spark regime could not be sustained due to repeated quenches and reestablishments.…”

Section: Introductionmentioning

confidence: 80%

Streamer dynamics and periodical discharge regime transitions under repetitive nanosecond pulses with airflow

Zhao¹,

Li²,

Guo³

et al. 2023

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Although the nanosecond repetitively pulsed (NRP) discharge normally stabilizes into one of three regimes (corona/glow/spark) in a pulse train, another nonintuitive instability recently proved that it could periodically swing between corona and spark regimes characterized by repeated spark quenches and reestablishments (Zhao Z et al 2022 Plasma Sources Sci. Technol. 31 045005). In this paper, we have further investigated the suitability of NRP discharge regime transitions for different pulsed power supplies and revealed dramatic effects of the gas flow on streamer dynamics that possibly lead to spark quenches. Pulse-sequence and temporally resolved electrical and optical diagnostics were implemented to capture discharge evolutions in long pulse trains. Periodical discharge regime transitions under long-term repetitive nanosecond pulses are prevalent under transmission line transformer pulser and commercially available FID pulser with parameter constraints. A minimum deposited energy per spark is required for the successive spark pattern. The spark channel before its quench statistically prefers to deviate upstream rather than following the straight axis or intuitively bending downstream to search for more remnants. Before spark quenches, the initial streamer already either exhibits a large radial “detour” or propagates with a zig-zag profile along the periphery of previous spark regions. The periodical discharge regime transition and effects of the gas flow are qualitatively explained based on the plasma-source coupling, evolutions of dominant negative ions composition, and 3D streamer simulation. Periodical NRP spark quenches are probably initiated with the streamer “detour” and then accelerated by the thermal-ionization feedback instability. Inhomogeneous residual charge distribution and accumulations of complex negative ions with high electron bound energies may facilitate the following discharge to search for the gas inlet. In-depth understanding of NRP discharge instabilities could be reached, which are fundamentally governed by residual charge transport and energy relaxation.

show abstract

Section: Introductionmentioning

confidence: 80%

Streamer dynamics and periodical discharge regime transitions under repetitive nanosecond pulses with airflow

Zhao¹,

Li²,

Guo³

et al. 2023

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is important to mention that at certain conditions the discharge regime cannot be sustained continuously. As it was mentioned by Zhao et al [42] the discharge may swing among different regimes due to periodical spark quench and reestablishment. Such intermittent behaviour is caused by memory effect between applied pulses.…”

Section: Morphology and Energy Deposition Of Nrpds In The Vitiated Ho...mentioning

confidence: 90%

Effect of plasma-flow coupling on the ignition enhancement with non-equilibrium plasma in a sequential combustor

Shcherbanev

Malé

Dharmaputra

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The effect of the regime of Nanosecond Repetitively Pulsed Discharges (NRPDs) on ignition and stabilization of a natural-gas/hydrogen/air flame in the sequential stage of a lab-scale atmospheric pressure sequential combustor is investigated experimentally. Electrical parameters of the NRPDs are characterized by measuring voltage, current, and deposited energy. Fast Gas Heating (FGH) of the nanosecond discharges is measured in a single pulse regime and validated by means of 0D kinetic modelling. It was found that conventional scheme for energy release from internal degrees of freedom adequately describes the dynamics of fast gas heating in vitiated hot environment diluted with air. Short-gated ICCD imaging and spatially-resolved emission spectroscopy are used to identify the coupling between the NRPDs and the vitiated hot flow. The effectiveness of the NRPDs actuation is assessed through the OH* chemiluminescence images of the sequential flame. The distance of the center of gravity of the sequential flame to the outlet of the mixing channel is evaluated, with and without plasma actuation. The effect of fuel reactivity on plasma effectiveness is also studied by varying the fraction of hydrogen in the fuel blend of the second stage of the combustor. The results show that the glow NRPDs regime allows strengthening the flame anchoring for the most reactive blends considered in this work, while the spark NRPDs is required for the ignition and prevention of lean blow-out of the flame for the least reactive fuel blends which exhibit low fractions of hydrogen.

show abstract

“…At near atmospheric pressure, NRP discharges can be in corona, glow, non-equilibrium spark, or equilibrium spark regime depending on operating conditions and electrode construction [31,32]. Typically, it is difficult to maintain a plasma in one specific regime, as small changes in the operating conditions can modify the plasma regime [33]. Especially the non-equilibrium spark to equilibrium spark transition is very fast.…”

Section: Introductionmentioning

confidence: 99%

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

Patel,

Peelen,

van Oijen

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This work aims to find how coupled energy per pulse influences the ability of a pulsed dielectric barrier discharge (DBD) plasma to ignite fuel-lean methane–air flow. For that, experiments are performed on a custom-built DBD flow reactor with a variable dielectric thickness and the discharge is operated by bursts of 10 ns duration pulses at 3 kHz repetition rate. With an increase in dielectric thickness, we observe that the coupled energy per pulse decreases even though applied voltage conditions are similar and so more pulses are required to ignite the lean mixture. Interestingly, we observe a significant increase in the minimum ignition energy (MIE) with an increase in the thickness beyond 3 mm. Moreover, the ignition kernel growth rate is much slower in the thicker dielectric cases even though total energy coupling per burst is similar. This phenomenon is investigated further by evaluating plasma parameters using electrical and optical diagnostics. Effective dielectric capacitance, discharge current, and voltage drop across the gas gap are derived from an equivalent circuit analysis, whereas plasma gas temperature and effective reduced electric field ( E / N ) are estimated from optical emission spectroscopy. From these analyses, we conclude that a thicker dielectric limits the discharge current and so the plasma filament temperature. For more than 3 mm thick dielectric cases, the filament heating per pulse is too low to achieve strong enough plasma pulse-to-pulse coupling which eventually leads to higher MIE and slower ignition kernel growth rate or the inability to ignite at all.

show abstract

Periodical discharge regime transitions under long-term repetitive nanosecond pulses

Cited by 12 publications

References 62 publications

Streamer dynamics and periodical discharge regime transitions under repetitive nanosecond pulses with airflow

Streamer dynamics and periodical discharge regime transitions under repetitive nanosecond pulses with airflow

Effect of plasma-flow coupling on the ignition enhancement with non-equilibrium plasma in a sequential combustor

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

Contact Info

Product

Resources

About