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Daou, F.; Vincent, Axel; Amouroux, J.

doi:10.1023/a:1022972103224

Cited by 24 publications

(7 citation statements)

References 13 publications

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“…In the present experiments, the methane mass flowrates range from 0.35 to 5.3 slpm corresponding to the jet velocity from V J = 2 to V J = 35 m s −1 and Reynolds numbers from 250 to 4250 (Reynolds numbers estimations based on the exit diameter of the burner and the outlet velocity). Depending on the application, the DBD can have different geometrical configurations: coaxial (gas treatment for pollution control [15,16] or ozone synthesis [17]), multipoint-to-plane (pollution control [18]), knifecylinder or cylinder-cylinder (polymer treatment [19]), etc. We made the choice of a coaxial configuration because it allows the electrodes to be hidden inside the burner, making it the most adapted to high velocity gas flow in combustion chambers.…”

Section: Methodsmentioning

confidence: 99%

Plasma assisted combustion: effect of a coaxial DBD on a methane diffusion flame

Vincent‐Randonnier¹,

Larigaldie²,

Magre³

et al. 2006

Plasma Sources Sci. Technol.

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An experimental study of plasma assisted combustion has been initiated at ONERA in order to evaluate the potential application to supersonic combustion with various fuels. For this first step, we choose an easier and more versatile configuration where a coaxial dielectric barrier discharge is applied to a methane diffusion flame. The effects of this discharge on the flame structure and especially the reduction in its detachment height have been investigated. The role of the large scale motion of the flame on its anchoring by the plasma has then been revealed, along with the presence of a plasma channel linking the flame to the burner. Electrical and optical investigations demonstrated the pulsed nature of the light emission of the plasma and the spectroscopic study of OH, CH and N * 2 exhibits a 10 mm overlap between the plasma and the flame.

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Section: Methodsmentioning

confidence: 99%

Plasma assisted combustion: effect of a coaxial DBD on a methane diffusion flame

Vincent‐Randonnier¹,

Larigaldie²,

Magre³

et al. 2006

Plasma Sources Sci. Technol.

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“…Under a higher energy electron collision, N 2 will transform into N radicals. With the presence of the H 2 O and N 2 molecules in the engine, the possible reactions are as follows [36,37]:…”

Section: Reactions Of the Ntp System And Engine Combustionmentioning

confidence: 99%

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

et al. 2021

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The exhaust emissions from Internal Combustion Engines (ICE) are currently one of the main sources of air pollution. This research presented a method for improving the exhaust gases and the performance of a Spark-Ignition (SI) engine using a water vapor injection system and a Non-Thermal Plasma (NTP) system. These two systems were installed on the intake manifold to investigate their effects on the engine’s performance and the characteristics of exhaust emission using different air/fuel (A/F) ratios and engine speeds. The temperatures of the injected water were adjusted to 5 and 25 °C, using a thermoelectric cooler (TEC) temperature control device. The total hydrocarbons (HC), nitrogen oxide (NOx), and engine torque were measured at different A/F ratios and engine speeds. The results indicated that the adaptation of the water vapor injection system and NTP system increased the content of the combustibles and combustion-supporting substances while achieving better emissions and torque. According to the test results, while the engine torque under 25 °C water+NTP was raised to 7.29%, the HC under 25 °C water+NTP and the NOx under 25 °C water were reduced to 16.31% and 11.88%, respectively. In conclusion, the water vapor injection and the NTP systems installed on the intake manifold could significantly reduce air pollution and improve engine performance for a more sustainable environment.

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“…In particular, using deuterated water for the wet reforming reaction of methane, we were able to prove that not only direct reactions transforming the reactants (methane and water) intro products (hydrogen and carbon Monoxide) take place in the plasma, but also a panoply of intermediate processes that, consuming energy, do not lead to the formation of new product molecules [3]. To our knowledge, this is a first attempt in the literature to characterize DBD gas synthesis mechanisms, using a methodology that, while widely used in conventional or enzymatic catalysis for the same purpose [13][14][15][16][17], has only been incipiently used to study the plasma removal of pollutants [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Isotope Labelling for Reaction Mechanism Analysis in DBD Plasma Processes

et al. 2019

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Dielectric barrier discharge (DBD) plasmas and plasma catalysis are becoming an alternative procedure to activate various gas phase reactions. A low-temperature and normal operating pressure are the main advantages of these processes, but a limited energy efficiency and little selectivity control hinder their practical implementation. In this work, we propose the use of isotope labelling to retrieve information about the intermediate reactions that may intervene during the DBD processes contributing to a decrease in their energy efficiency. The results are shown for the wet reforming reaction of methane, using D2O instead of H2O as reactant, and for the ammonia synthesis, using NH3/D2/N2 mixtures. In the two cases, it was found that a significant amount of outlet gas molecules, either reactants or products, have deuterium in their structure (e.g., HD for hydrogen, CDxHy for methane, or NDxHy for ammonia). From the analysis of the evolution of the labelled molecules as a function of power, useful information has been obtained about the exchange events of H by D atoms (or vice versa) between the plasma intermediate species. An evaluation of the number of these events revealed a significant progression with the plasma power, a tendency that is recognized to be detrimental for the energy efficiency of reactant to product transformation. The labelling technique is proposed as a useful approach for the analysis of plasma reaction mechanisms.

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Untitled

Cited by 24 publications

References 13 publications

Plasma assisted combustion: effect of a coaxial DBD on a methane diffusion flame

Plasma assisted combustion: effect of a coaxial DBD on a methane diffusion flame

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

Isotope Labelling for Reaction Mechanism Analysis in DBD Plasma Processes

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