Nanosecond Pulsed Plasma Activated C2H4/O2/Ar Mixtures in a Flow Reactor

Yang, Suo; Gao, Xiang; Yang, Vigor; Sun, Wenting; Nagaraja, Sharath; Lefkowitz, Joseph K.; Ju, Yiguang

doi:10.2514/1.b36060

Cited by 37 publications

(49 citation statements)

References 53 publications

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“…In typical plasma assisted ignition and combustion conditions, the concentrations of hydrocarbons are high. For this reason, the reactions between O( 1 D) and hydrocarbons become much faster (approximately 4 times) than the quenching of O( 1 D) to O [28], and should be added to the plasma-combustion chemistry models.…”

Section: Plasma-combustion Chemistrymentioning

confidence: 99%

“…The "frozen electric field" strategy takes advantage of the quasi-periodic behaviors of the electrical field to avoid the re-calculation of the electric field for each pulse. [25,28] show that the electrical characteristics are not exactly periodic, but approach pure periodicity after a certain number of pulses, when the input energy per pulse becomes stable (that is, the field achieves quasi-equilibrium). After the plasma has reached quasi-equilibrium, the accumulated input energy is linearly proportional to the number of pulses.…”

Section: "Frozen Electric Field" Strategymentioning

confidence: 99%

“…Previous studies [24,28,29,38,79,80] on the nanosecond pulsed plasma discharge of air and fuel/oxidizer/diluent mixtures have provided very detailed information about the underlying physical processes. Here we bring these previous works together to develop a general theory.…”

Section: Nanosecond Pulsed Plasma Discharges: a Multi-timescale Theorymentioning

confidence: 99%

“…Because of the multiscale nature of plasma, it is natural to classify its key physical processes kHz repetition rate. [28] The multi-timescale theory for nanosecond pulsed plasma discharges is summarized in Table 1. The underlying physical processes are categorized into four stages with drastically different timescales.…”

Section: Nanosecond Pulsed Plasma Discharges: a Multi-timescale Theorymentioning

confidence: 99%

“…into O, O( 1 D), and O( 1 S), which contributes 40-70% of O generation and part of the fast gas heating in bulk plasma [24,28]. O+O( 1 D) is the dominant product combination during the electron impact dissociation of O2 [63].…”

Section: Stage Idischarge Pulsementioning

confidence: 99%

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Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion

Yang¹,

Nagaraja²,

Sun³

et al. 2017

J. Phys. D: Appl. Phys.

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A self-consistent 1D theoretical framework for plasma assisted ignition and combustion is reviewed. In this framework, a "frozen electric field" modeling approach is applied to take advantage of the quasi-periodic behaviors of the electrical characteristics to avoid the recalculation of electric field for each pulse. The correlated dynamic adaptive chemistry (CO-DAC) method is employed to accelerate the calculation of large and stiff chemical mechanisms.The time-step is updated dynamically during the simulation through a three-stage multitimescale modeling strategy, which takes advantage of the large separation of timescales in nanosecond pulsed plasma discharges. A general theory of plasma assisted ignition and combustion is then proposed. Nanosecond pulsed plasma discharges for ignition and combustion can be divided into four stages. Stage I is the discharge pulse, with timescales of O(1-10 ns). In this stage, most input energy is coupled into electron impact excitation and dissociation reactions to generate charged/excited species and radicals. Stage II is the afterglow during the gap between two adjacent pulses, with timescales of O(100 ns). In this stage, quenching of excited species not only further dissociates O2 and fuel molecules, but also provides fast gas heating. the remaining gap between pulses, with timescales of O(1-100 μs). The radicals generated during Stages I and II significantly enhance the exothermic reactions in this stage. Stage IV is the accumulative effects of multiple pulses, with timescales of O(1 ms -1 sec), which include preheated gas temperatures and a large pool of radicals and fuel fragments to trigger ignition. For plasma assisted flames, plasma significantly enhances the radical generation and gas heating in the pre-heat zone, which could trigger upstream auto-ignition.Keywords: plasma assisted combustion, plasma fluid modeling, nanosecond plasma discharge, low temperature chemistry, ignition. Nomenclature

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Section: Plasma-combustion Chemistrymentioning

confidence: 99%

Section: "Frozen Electric Field" Strategymentioning

confidence: 99%

Section: Nanosecond Pulsed Plasma Discharges: a Multi-timescale Theorymentioning

confidence: 99%

Section: Nanosecond Pulsed Plasma Discharges: a Multi-timescale Theorymentioning

confidence: 99%

Section: Stage Idischarge Pulsementioning

confidence: 99%

See 3 more Smart Citations

Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion

Yang¹,

Nagaraja²,

Sun³

et al. 2017

J. Phys. D: Appl. Phys.

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MBMS study on plasma‐assisted low‐temperature oxidation of n‐heptane and iso‐octane in a flow reactor

Liao

Chen

Liu

et al. 2020

Int J of Chemical Kinetics

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Nonequilibrium plasma has a great potential in the lean combustion of gasoline engines. However, fundamental studies on plasma‐assisted combustion on gasoline components are limited. In the present study, Low‐temperature oxidation behaviors for n‐heptane and iso‐octane in a plasma flow reactor were investigated. Species measurements were performed at room temperature and low pressure of 40 mbar using the electron ionization molecular‐beam mass spectrometry (EI‐MBMS). A total of 72 and 57 species were quantified in n‐heptane and iso‐octane oxidation, respectively. Based on measured species data, reaction networks of n‐heptane and iso‐octane in the plasma system were discussed. Particularly, some typical low‐temperature intermediates, such as cyclic ethers, diones, and ketohydroperoxides, were observed, suggesting the applicability of the classical low‐temperature reaction scheme in the plasma system of large hydrocarbons. The results indicate that the major role of plasma discharge on the low‐temperature oxidation of large hydrocarbons is either to breakdown large fuel molecules or to accelerate the chain initiation reactions. We also investigated the parametric effects of voltage, frequency, and residence time on the species pools, and found that the increase of these parameters leads to higher production of intermediates. The whole system reactivity was most sensitive to the plasma voltage. The difference between plasma frequency and residence time on the species formation was found. Moreover, some highly temperature‐sensitive reactions, such as the RO2 → QOOH, proceed at very low temperatures (around 340 K) in the plasma system, which was potentially attributed to the additional energy from plasma‐generated species.

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Effects of controlled non-equilibrium excitation on H2/O2/He ignition using a hybrid repetitive nanosecond and DC discharge

Mao

Chen

Rousso

et al. 2019

Combustion and Flame

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Nanosecond Pulsed Plasma Activated C2H4/O2/Ar Mixtures in a Flow Reactor

Cited by 37 publications

References 53 publications

Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion

Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion

MBMS study on plasma‐assisted low‐temperature oxidation of n‐heptane and iso‐octane in a flow reactor

Effects of controlled non-equilibrium excitation on H2/O2/He ignition using a hybrid repetitive nanosecond and DC discharge

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