On pulse-to-pulse coupling in low-temperature filamentary plasma-assisted ignition in methane-air flows

Patel, Ravi; Oijen, J.A. van; Nijdam, S Sander; Dam, Nico

doi:10.1088/1361-6595/acd65c

Cited by 6 publications

(11 citation statements)

References 58 publications

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“…The pulse-to-pulse coupling is very weak for d = 7 mm, and no coupling is observed for d = 9 mm. We have reported similar behavior of weakening of the pulse-to-pulse coupling at higher flow speeds, lower PRR, and lower pressures [46,48]. This was attributed to lower flow residence time inside the discharge region or lower plasma gas heating.…”

Section: Pulse-to-pulse Plasma Morphologysupporting

confidence: 65%

“…This means that a higher energy per pulse is beneficial for ignition kernel growth. Moreover, from our previous work [48], we know that the ignition kernel size is a function of total energy coupling per burst (i.e. the number of pulses per burst at fixed PRR multiplied with the energy per pulse) whereas in this work we observe the contrary.…”

Section: Energy Coupled Into Plasmamentioning

confidence: 49%

“…In order to study the influence of energy per pulse on ignition kernel growth rate, the high-speed image series are processed using MatLab script, and the ignition kernel area for each time step is evaluated. The image processing steps are explained in our previous work [48]. The results are plotted in figure 11.…”

Section: Energy Coupled Into Plasmamentioning

confidence: 99%

“…We highlighted the importance of plasma pulse-to-pulse coupling for ignition. Also, we characterized the effects of flow speed and pulse repetition rate (PRR) on the pulseto-pulse coupling [48]. Our previous studies [46,48] are performed on the same DBD reactor as in this work, with 5 mm discharge gap and one electrode covered with a 2 mm thick dielectric.…”

Section: Introductionmentioning

confidence: 99%

“…Also, we characterized the effects of flow speed and pulse repetition rate (PRR) on the pulseto-pulse coupling [48]. Our previous studies [46,48] are performed on the same DBD reactor as in this work, with 5 mm discharge gap and one electrode covered with a 2 mm thick dielectric. Along with these reported studies, we have tried reactor configurations with both electrodes covered with a 2 mm thick dielectric.…”

Section: Introductionmentioning

confidence: 99%

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

Patel,

Peelen,

van Oijen

et al. 2023

J. Phys. D: Appl. Phys.

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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.

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Section: Pulse-to-pulse Plasma Morphologysupporting

confidence: 65%

Section: Energy Coupled Into Plasmamentioning

confidence: 49%

Section: Energy Coupled Into Plasmamentioning

confidence: 99%