Ignition by Short Duration, Nonequilibrium Plasma: Basic Concepts and Applications in Internal Combustion Engines

Tropina, Albina; Shneider, Mikhail N.; Miles, Richard B.

doi:10.1080/00102202.2015.1125347

Cited by 20 publications

(10 citation statements)

References 50 publications

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“…Flame propagation and ignition are facilitated by an increase in system activity because of the overpopulation of the excited states. Based on the above argument, Silva, 46 Tropina, 47 Starikovskaia, 48 and Du 49 all suggested that discharge energy branching ratios is the most important aspect of plasma-stimulated chemistry. They argued that discharge energy branching ratios accounts for the rate of system relaxation, molecules degrees of freedom, and the response of chemically active system to nonequilibrium states.…”

Section: Plasma Discharge Energy Branchingmentioning

confidence: 99%

“…47,48 It is of course questionable to directly hypothesize that these models can be applied to low, high, or midtemperature kinetics, without considering other reaction conditions below the selfignition threshold. The excessive rise in temperature could also affect the effective application of plasma in GT combustion.…”

Section: Kinetics Of Below Self-ignition Threshold For Plasma Combumentioning

confidence: 99%

“…For instance, the Konnov mechanism was validated down to 910 K, and in the case of the Popov's hydrogen mechanism, the validation was down to 880 K. In addition, the validation of methane combustion model from the range of 1250 to 2500 K is still not well reported. 47,48 It is of course questionable to directly hypothesize that these models can be applied to low, high, or midtemperature kinetics, without considering other reaction conditions below the selfignition threshold. Thus, investigating the mechanisms of different combination mode (low temperature, high temperature, during gas discharge, after glow, etc) for plasma combustion becomes indispensable.…”

Section: Kinetics Of Below Self-ignition Threshold For Plasma Combumentioning

confidence: 99%

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A review on plasma combustion of fuel in internal combustion engines

et al. 2017

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Summary In recent years, new ways of improving the combustion efficiency of fuel during gas turbine operations have been developed. The most significant has been the application of plasma technology for the combustion of fuel in gas turbine operations. Plasma is formed when gas is exposed to either high temperature or high‐voltage electricity. This technology is very promising and has proven to enhance the performance of gas turbines and reduce toxic emissions. Recent studies have shown the use of different types of plasma applications in gas turbine operations such as plasma torch, filamentary discharge, and nanosecond pulse discharge, whose results show that plasma technology has great potential in improving flame stabilization, the fuel/air mixing ratio, and flash point values of these fuels. These findings and advances have further provided new opportunities in the development of efficient plasma discharges for practical uses in plasma combustion of fuel for gas turbine operations. This article is a comprehensive overview of the advances and blind spots in the knowledge of plasma combustion of fuel during internal combustion engine operations. This review also focuses on applications, methods, and experimental results in plasma combustion of fuel in gas turbines.

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Section: Plasma Discharge Energy Branchingmentioning

confidence: 99%

Section: Kinetics Of Below Self-ignition Threshold For Plasma Combumentioning

confidence: 99%

Section: Kinetics Of Below Self-ignition Threshold For Plasma Combumentioning

confidence: 99%

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A review on plasma combustion of fuel in internal combustion engines

et al. 2017

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“…However, these conventional ignition methods have problems such as small ignition area, low ignition energy, and also narrow ignition boundary and low ignition reliability especially when the engine is operating under harsh conditions. In the past two decades, the plasma ignition technology has become a research hotspot because it has notable characteristics, for example, large ignition energy [7], strong penetration of the flame tongue [8], and high chemical activity [1,9,10]. e plasma igniter can improve the ignition reliability and stability of an aeroengine under harsh conditions and can significantly expand its ignition boundary compared with the conventional electric spark igniter [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

Chen

Bing

et al. 2019

Journal of Spectroscopy

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Ar, N2, O2, and N2-O2 mixture under different O2 components were separately used as the working medium gas of a plasma igniter to study the influence of working-medium-gas type and O2 concentration on emission spectral and temperature characteristics of a direct-current arc plasma igniter. The emission spectra of the plasma jet were also analyzed using the optical emission spectroscopy method, and the influence rule of working medium gas and O2 concentration on electron temperature and vibrational temperature of the plasma jet was calculated and analyzed. The experimental results show that the emission spectra of the plasma jet had significant differences when diverse working gases were used as the working medium of the igniter. With increasing O2 concentration in the working medium gas, the spectral line intensity of oxygen-containing particles in emission spectra of the plasma jet was significantly enhanced, and the spectral intensities of nitrogen-containing particles, NO molecular bands, the second positive system of N2C3∏u−B3∏g, and the first negative system of N2+B2∑u+−X2∑u+ were also enhanced obviously. Both electron and vibrational temperature of the plasma jet increased gradually with increasing O2 concentration in the working medium gas, and first increased and then decreased with increasing axial distance from the plasma jet.

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“…turbulent fluctuating velocity (u ) and other complex conditions. For example, the mixture characteristics in the vicinity of an engine top dead center are frequently changed from lean to stoichiometry or even rich when the loads vary from low to high [1]. Besides, the mixture characteristics and values of u change from cylinder to cylinder, resulting in the difference of flame initiation and subsequent flame propagation speed.…”

Section: Introductionmentioning

confidence: 99%

General Correlations of Iso-octane Turbulent Burning Velocities Relevant to Spark Ignition Engines

Nguyen

Chen

et al. 2019

Energies

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A better understanding of turbulent premixed flame propagation is the key for improving the efficiency of fuel consumption and reducing the emissions of spark ignition gasoline engines. In this study, we measure turbulent burning velocities (ST) of pre-vaporized iso-octane/air mixtures over wide ranges of the equivalence ratio (φ = 0.9–1.25, Le ≈ 2.94–0.93), the root-mean-square (r.m.s.) turbulent fluctuating velocity (u′ = 0–4.2 m/s), pressure p = 1–5 atm at T = 358 K and p = 0.5–3 atm at T = 373 K, where Le is the effective Lewis number. Results show that at any fixed p, T and u′, Le < 1 flames propagate faster than Le > 1 flames, of which the normalized iso-octane ST/SL data versus u′/SL are very scattering, where SL is the laminar burning velocity. But when the effect of Le is properly considered in some scaling parameters used in previous correlations, these large scattering iso-octane ST/SL data can be collapsed onto single curves by several modified general correlations, regardless of different φ, Le, T, p, and u′, showing self-similar propagation of turbulent spherical flames. The uncertainty analysis of these modified general correlations is also discussed.

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Ignition by Short Duration, Nonequilibrium Plasma: Basic Concepts and Applications in Internal Combustion Engines

Cited by 20 publications

References 50 publications

A review on plasma combustion of fuel in internal combustion engines

A review on plasma combustion of fuel in internal combustion engines

Effects of Working Medium Gases on Emission Spectral and Temperature Characteristics of a Plasma Igniter

General Correlations of Iso-octane Turbulent Burning Velocities Relevant to Spark Ignition Engines

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