Influence of nanosecond repetitively pulsed discharges on the stability of a swirled propane/air burner representative of an aeronautical combustor

Barbosa, Séverine; Pilla, Guillaume; Lacoste, Déanna A.; Scouflaire, Philippe; Ducruix, Sébastien; Laux, Christophe O.; Veynante, Denis

doi:10.1098/rsta.2014.0335

Cited by 58 publications

(40 citation statements)

References 22 publications

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“…Also, advances have been made by using NRRP and nanosecond dielectric barriers as discussed above. 87,107,109 The findings and advances have provided new opportunities in the development of efficient plasma discharges for practical applications and for predictive and empirical kinetic modelling and validation of plasma combustion processes for different reaction conditions. However, several challenges limit the effective use of plasma technology in combustions of fuel during engine operations.…”

Section: Future Trend and Challengesmentioning

confidence: 99%

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: Future Trend and Challengesmentioning

confidence: 99%

A review on plasma combustion of fuel in internal combustion engines

et al. 2017

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“…The application of non-equilibrium plasmas to lean premixed or partially premixed combustion regimes can decrease ignition delay and extend flame stability domains, as demonstrated in several experimental works [1][2][3][4][5][6][7][8] . In particular, non-equilibrium plasmas produced by Nanosecond Repetitively Pulsed (NRP) discharges are an energy-efficient way to generate O radicals that readily react with the surrounding fuel molecules and enhance the combustion phenomena [9,10] .…”

Section: Introductionmentioning

confidence: 96%

A 3-D DNS and experimental study of the effect of the recirculating flow pattern inside a reactive kernel produced by nanosecond plasma discharges in a methane-air mixture

Castela

Stepanyan

Fiorina

et al. 2017

Proceedings of the Combustion Institute

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This paper presents 3-D DNS and experimental schlieren results used to study a non-equilibrium plasma discharge in a lean methane-air mixture. A detailed combustion mechanism and a plasma model, developed in our previous work, are used in the 3-D computations in order to study the impact of gas flow recirculation on the temporal evolution of species and gas temperature in the vicinity of the discharge zone. The results show that the formation of a fresh gas counterflow, with stagnation plane at the centre of the discharge and parallel to the electrodes, changes the topology of the hot kernel from an initial cylindrical shape to a toroidal one. This phenomenon leads to an increase of the area/volume ratio of the reactive kernel, that may result under certain conditions in kernel extinction. The results also show the importance of considering this 3-D gas flow recirculation to correctly predict the temporal evolution of the hot kernel. In particular, we show that the temperature and species concentrations in the central region of the discharge return to fresh gas conditions shortly after the end of the pulse. In the experimental case investigated here, this time is of the order of 150 μs. This result is particularly important for ignition by Nanosecond Repetitively Pulsed (NRP) discharges, because the gas conditions at the beginning of each successive pulse depend strongly on the time interval between pulses, thus on the pulse frequency

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“…Nanosecond discharges have shown strong potential for various applications such as Plasma-Assisted Ignition (PAI) [1][2][3][4][5], lean flame stabilization [6][7][8], aerodynamic flow control [9][10][11][12] and nanomaterial synthesis [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Large-volume excitation of air, argon, nitrogen and combustible mixtures by thermal jets produced by nanosecond spark discharges

Stepanyan

Hayashi

Salmon

et al. 2017

Plasma Sources Sci. Technol.

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This work presents experimental observations of strong expanding thermal jets following the application of nanosecond spark discharges. These jets propagate in a toroidal shape perpendicular to the interelectrode axis, with high velocities of up to 30 m/s and over distances of centimeter scale. Their propagation length is much larger than the thermal expansion region produced by the conventional millisecond sparks used in car engine ignition, thus greatly improving the volumetric excitation of gas mixtures. The shape and velocity of the jets is found to be fairly insensitive to the shape of the electrodes. In addition, their spatial extent is found to increase with the number of nanosecond sparks and with the discharge voltage, and to decrease slightly with the pressure between 1 and 7 atm at constant applied voltage. Finally, this thermal jet phenomenon is observed in experiments conducted with many types of gas mixtures, including air, nitrogen, argon, and combustible CH 4 /air mixtures. This makes Nanosecond Repetitively Pulsed (NRP) discharges particularly attractive for aerodynamic flow control or plasma-assisted combustion because of their ability to excite very large volumes of gas.

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Influence of nanosecond repetitively pulsed discharges on the stability of a swirled propane/air burner representative of an aeronautical combustor

Cited by 58 publications

References 22 publications

A review on plasma combustion of fuel in internal combustion engines

A review on plasma combustion of fuel in internal combustion engines

A 3-D DNS and experimental study of the effect of the recirculating flow pattern inside a reactive kernel produced by nanosecond plasma discharges in a methane-air mixture

Large-volume excitation of air, argon, nitrogen and combustible mixtures by thermal jets produced by nanosecond spark discharges

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