Barrier discharges driven by sub-microsecond pulses at atmospheric pressure: Breakdown manipulation by pulse width

Hoder, Tomáš; Höft, Hans; Kettlitz, M.; Weltmann, Klaus‐Dieter; Brandenburg, Ronny

doi:10.1063/1.4736716

Cited by 47 publications

(34 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, these similarities are a strong indication that these filaments are igniting in a highly pre-ionised gap [41], although it is important to note that also the gas composition has a distinct impact on the streamer inception [24,42]. In addition, for the virtually pure N 2 case, it seems that after the short cathode-directed streamer a slower anode-directed ionisation front starts propagating, which was also found to be a breakdown regime for highly pre-ionised singlefilament DBDs [26,43].…”

Section: Hybrid Modementioning

confidence: 83%

Exploring the mechanisms leading to diffuse and filamentary modes in dielectric barrier discharges in N$$_2$$ with N$$_2$$O admixtures

et al. 2023

Self Cite

View full text Add to dashboard Cite

The effects of nitrous oxide (N$$_2$$ 2 O) in nitrogen (N$$_2$$ 2 ) on the development and morphology of sine-driven dielectric barrier discharges in a single-filament arrangement were studied. Detailed insight in the characteristics of the discharge and its development were obtained from electrical measurements combined with ICCD and streak camera recordings as well as numerical modelling. A miniaturised atmospheric pressure Townsend discharge (APTD) could be generated for admixtures up to 5 vol% N$$_2$$ 2 O in N$$_2$$ 2 although N$$_2$$ 2 O is an efficient collisional quencher of metastable nitrogen molecules. Increasing the high voltage amplitude led to a transition into a hybrid mode with the generation of an intermediate filament in addition to the diffuse, non-constricted APTD. A time-dependent, spatially one-dimensional fluid model was applied in order to study the underlying mechanisms causing the diffuse discharge characteristics. It was found that even for small N$$_2$$ 2 O admixtures, the associative ionisation of atomic nitrogen and oxygen (O + N($$^2$$ 2 P) $$\rightarrow $$ → NO$$^+$$ + + e) is the major electron source sustaining the volume memory effect and is therefore the reason for the formation of a diffuse APTD. Graphical abstract

show abstract

Section: Hybrid Modementioning

confidence: 83%

Exploring the mechanisms leading to diffuse and filamentary modes in dielectric barrier discharges in N$$_2$$ with N$$_2$$O admixtures

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, as key parameters, we can mention the repetition frequency of the discharge [43][44][45], the electrode setup geometry and the air pressure. Indeed, under transient luminous event conditions in upper atmosphere the emission delays are expected to be observable as well [17].…”

Section: Introductionmentioning

confidence: 99%

Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2(C3Πu) and N2+(B2Σu+) emissions and fundamental streamer structure

Hoder

Bonaventura

Bourdon

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

Both experimental and theoretical analysis of an ultra-short phenomena occurring during the positive streamer propagation in atmospheric pressure air is presented. With tens-of-picoseconds and tens-of-microns precision, it is shown that when the streamer head passes a spatial coordinate, emission maxima from N2 and N + 2 radiative states follow with different delays. These different delays are caused by differences in the dynamics of populating the radiative states, due to different excitation and quenching rates. Associating the position of the streamer head with the maximum value of the selfenhanced electric field, a delay of 160 ps was experimentally found for the peak emission of the first negative system of N + 2 . For the first time, a delay dilatation was observed experimentally on early-stage streamers and clarified theoretically. Thus, in the case of second positive system of N2 the delay can reach as much as 400 ps. In contrast to the highly-nonlinear behaviour of streamer events, it is shown theoretically that emission maxima delays linearly depend on the ratio of the streamer radius and its velocity. This is found to be one of the fundamental streamer features and its use in streamer head diagnostics is proposed. Moreover, radially-resolved spectra are synthetized for selected subsequent picosecond moments in order to visualize spectrometric fingerprints of radial structures of N2(C 3 Πu) and N + 2 (B 2 Σ + u ) populations created by streamer-head electrons.

show abstract

“…Hence, the increase rates of the emission intensity of FNS of N2 + are different in the top and bottom of the reactor. As for N2 (C 3 Пu), the excitation potential of N2 (C 3 Пu) is about 11 eV [36], which is much smaller than that of N2 + (B 2 Σu + ). This means that the production of N2 (C 3 Пu) is not dependent on the high energy electrons produced in the streamer channel, and the discharges at the top and the bottom of the reactor can both play roles in generating N2 (C 3 Пu).…”

Section: The Effects Of Pulse Duration On Reactive Speciesmentioning

confidence: 86%

The Effect of Voltage Pulse Shape on the Discharge Characteristics in the Packed Bed Reactor under Air and Nitrogen

Qin

Yang

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

In this paper, the packed bed dielectric barrier discharge (DBD) with needle-plate electrode configuration is presented to study the effects of electrical parameters, such as pulse duration and pulse rising and falling time, on discharge characteristics under air and nitrogen. The waveforms of the voltage and the discharge current, discharge evolution images, and the emission spectral of N2 (C3Пu → B3Пg) and N2+ (B2Σu+ → X2Σg+) are collected to investigate the discharge current, as well as the spatial distribution of the discharge modes and the reactive species in the packed bed reactor specifically. It is found that the pulse duration and pulse rising and falling time can regulate the discharge current. Firstly, increasing the pulse duration and the pulse rising and falling time can both increase the discharge duration. Secondly, the peak value of the discharge current has an obvious increasing trend with the pulse duration. Finally, the discharge start time can be delayed by increasing the pulse rising and falling time. A bright discharge channel is distributed at the top of the reactor, while the discharge is diffused at the bottom of the reactor. The generation of N2+ (B2Σu+) tends to depend on the existence of the streamer channel, and N2 (C3Пu) can be generated in the entire discharge area. In addition, the discharge operated in pure nitrogen can reach higher current values, a stronger discharge intensity, and longer existence time for the reactive species than in the air.

show abstract

Barrier discharges driven by sub-microsecond pulses at atmospheric pressure: Breakdown manipulation by pulse width

Cited by 47 publications

References 18 publications

Exploring the mechanisms leading to diffuse and filamentary modes in dielectric barrier discharges in N$$_2$$ with N$$_2$$O admixtures

Exploring the mechanisms leading to diffuse and filamentary modes in dielectric barrier discharges in N$$_2$$ with N$$_2$$O admixtures

Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2(C3Πu) and N2+(B2Σu+) emissions and fundamental streamer structure

The Effect of Voltage Pulse Shape on the Discharge Characteristics in the Packed Bed Reactor under Air and Nitrogen

Contact Info

Product

Resources

About