Numerical modeling of ignition enhancement using repetitive nanosecond discharge in a hydrogen/air mixture I: calculations assuming homogeneous ignition

Wang, Yuan; Guo, Peng; Chen, Haitao; Chen, Zheng

doi:10.1088/1361-6463/abbe49

Cited by 5 publications

(20 citation statements)

References 58 publications

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“…In our experiment, the DBD powered by the nanosecond pulse HV generator leads to a discharge that appears homogeneous, as shown in figure 2(b). Hence, in the present numerical study, it was assumed that the non-equilibrium plasma produced at atmospheric pressure in methane/air mixture is uniformly distributed (similar assumptions as previously taken by [35]). So even if the nanosecond pulsed plasma ignition process is three-dimensional, rather than homogenous, the simplified homogeneous model is considered, as previously used also in previous studies [19,35,37,38] to highlight the improvements in ignition delay timings just by thermal and kinetic effects, by preventing the transport and momentum effects of NRP.…”

Section: Numerical Method: Plasma and Chemical Kinetic Model Of Metha...mentioning

confidence: 99%

“…The CHEMKIN solver was used to investigate the combustion process with and without plasma actuation and characterize the flame properties, such as flame speed and ignition delay time, as described in [35,38,41].…”

Section: Numerical Method: Plasma and Chemical Kinetic Model Of Metha...mentioning

confidence: 99%

“…Therefore, a complete understanding of plasma chemistry is only possible with the development of detailed plasma kinetic mechanism of the methane-air mixture. Furthermore, thermal and kinetic effects on the ignition enhancement of H 2 /O 2 mixture have been observed by NRP [35], but a very small concentration has been placed on the thermal and kinetic effects of NRP on the ignition enhancement of methane-air mixture. Based on the context discussed above, the present work focuses on the…”

Section: Introductionmentioning

confidence: 99%

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Ignition thresholds and flame propagation of methane-air mixture: detailed kinetic study coupled with electrical measurements of the nanosecond repetitively pulsed plasma discharges

Mehdi¹,

Fontanarosa²,

Bonuso³

et al. 2022

J. Phys. D: Appl. Phys.

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A disk-ring nanosecond pulsed discharges plasma actuator was developed to be applied in a rectangular cross-section burner. The measured reduced electric field (EN), power dissipation and energy per pulse were used for validation of the plasma kinetic code ZDPlaskin. Then the effect of plasma discharges dynamics on methane/air flames, were numerically estimated. Firstly, plasma chemistry computations based on an extended kinetic mechanism of methane/air mixtures were performed by ZDPlasKin. Then, the results obtained by the ZDPlasKin in the form of kinetic effects (concentrations of O, OH, O3, CH, CH3 and H) and thermal effects (rise in temperature) were used in CHEMKIN to evaluate the combustion enhancement. The flame speed was improved by increasing both reduced electric field and repetition rates. Assuming EN = 200Td (as in experiments), and pulse repetition rate equal to 100Hz, the flame speed was increased of 26% in comparison with the case without the plasma actuation. Furthermore, at 10000 Hz, the flame speed was three times higher than at 100Hz. The ignition delay time greatly reduced from 1.2×10-3s (without plasma) up to 3.0×10-5s at 10000Hz repetition rate. The plasma assisted ignition n (PAI) permits ignition of the mixture at lower inlet temperature than in the case of self-ignition, meaning that ignition is possible in cold flow condition, with a possible application for the re-ignition problems at high altitude conditions. Finally, higher repetition rate leads to lower number of required pulses for the ignition of the CH4-air mixture and lower peak flame temperature.

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Section: Numerical Method: Plasma and Chemical Kinetic Model Of Metha...mentioning

confidence: 99%

Section: Numerical Method: Plasma and Chemical Kinetic Model Of Metha...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ignition thresholds and flame propagation of methane-air mixture: detailed kinetic study coupled with electrical measurements of the nanosecond repetitively pulsed plasma discharges

Mehdi¹,

Fontanarosa²,

Bonuso³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Numerical modeling has been performed by coupling a zero-dimensional plasma kinetic model (ZDPlasKin) [31] and the chemical kinetic model (CHEMKIN) [32]. A detailed description of coupling ZDPlasKin and CHEMKIN with their governing equations is available in [33,34]. ZDPlasKin was used to analyze the thermal and kinetic effects of nanosecond repetitive pulsed discharges on the air and methane/air mixture.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Effects of Nanosecond Repetitively Pulsed Discharges Timing for Aeroengines Ignition at Low Temperature Conditions by Needle-Ring Plasma Actuator

2021

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These days, various national and international research organizations are working on the development of low NOx combustors. The present work describes the experimental and numerical characterization of flow dynamics and combustion characteristics in a rectangular burner. A ring-needle type plasma actuator was developed and driven by a high voltage nanosecond pulsed generator under atmospheric conditions. Smoke flow visualizations and Proper Orthogonal Decomposition (POD) were carried out to identify the relevant flow structures. Electrical characterization of the non-reactive flow was carried out to predict the electrical power and the optimum value of the reduced electric field (EN), which is useful for the implementation of a numerical model for the study of plasma-assisted ignition. A detailed plasma kinetic mechanism integrated with all excited species was considered and validated with experimental studies. Numerical modeling of plasma ignition has been performed by coupling ZDPlasKin with CHEMKIN. Energy and power consumption for methane/air plasma actuation is higher than the air plasma actuation. This could be due to the excitation and ionization of methane that required more energy deposition and power. The mole fraction of O atoms and ozone was higher in the air than the methane/air actuation. However, O atoms were produced in a very short time interval of 10−7 to 10−6 s; in contrast, the concentration of ozone was gradually increased with the time interval and the peak was observed around 10−1 s. Plasma discharges on the methane/air mixture also produced radicals that played a key role to enhance the combustion process. It was noticed that the concentration of H species was high among all radicals with a concentration of nearly 10−1. The concentration peak of CH3 and OH was almost the same in the order of 10−2. Finally, the mixture ignition characteristics under different low inlet temperatures were analyzed for both air and methane/air plasma actuation in the presence of different plasma discharges pulses numbers. Results showed that it is possible to reach flame ignition at inlet temperature lower than the minimum required in the absence of plasma actuation, which means ignition is possible in cold flow, which could be essential to address the re-ignition problems of aeroengines at high altitudes. At Ti = 700 K, the ignition was reached only with plasma discharges; ignition time was in the order of 0.01 s for plasma discharges on methane/air, lower than in case of plasma in air, which permitted ignition at 0.018 s. Besides this, in the methane/air case, 12 pulses were required to achieve successful ignition; however, in air, 19 pulses were needed to ignite.

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“…As introduced in part I [8], in the literature there are many studies on ignition enhancement using NSD. However, most of the previous studies mentioned in part I [8] are on NSD assisted autoignition, which is only controlled by chemical kinetics and there is no heat or mass transport.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of ignition enhancement by repetitive nanosecond discharge in a hydrogen/air mixture II: forced ignition

Wang¹,

Guo²,

Chen³

et al. 2020

J. Phys. D: Appl. Phys.

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Non-equilibrium plasma has promising applications in combustion enhancement. In this study, 1D simulations are conducted for the forced ignition process using non-equilibrium plasma generated by repetitively pulsed nanosecond discharge (NSD). The ignition kernel is induced by a discharge area with NSD and it develops and propagates in a static stoichiometric hydrogen/air mixture. The objective is to assess how the characteristics of NSD affect the ignition delay time and ignition kernel development during the forced ignition process. Similar to the homogeneous ignition considered in part I, the forced ignition process is found to be strongly affected by the pulse number, discharge frequency, discharge radius, total input energy, and input energy per pulse of NSD. For a fixed input energy per pulse, the ignition delay time decreases and the propagation speed of the initial ignition kernel increases with the pulse number, discharge frequency and discharge radius. However, for a fixed total input energy, the ignition delay time increases and the propagation speed of the initial ignition kernel decreases with the pulse number. Furthermore, it is found that the promotion of ignition kernel development and propagation in the forced ignition by NSD are mainly due to the kinetic effect rather than the thermal effect.

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Numerical modeling of ignition enhancement using repetitive nanosecond discharge in a hydrogen/air mixture I: calculations assuming homogeneous ignition

Cited by 5 publications

References 58 publications

Ignition thresholds and flame propagation of methane-air mixture: detailed kinetic study coupled with electrical measurements of the nanosecond repetitively pulsed plasma discharges

Ignition thresholds and flame propagation of methane-air mixture: detailed kinetic study coupled with electrical measurements of the nanosecond repetitively pulsed plasma discharges

Effects of Nanosecond Repetitively Pulsed Discharges Timing for Aeroengines Ignition at Low Temperature Conditions by Needle-Ring Plasma Actuator

Numerical modeling of ignition enhancement by repetitive nanosecond discharge in a hydrogen/air mixture II: forced ignition

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