External and Internal Plasma- Assisted Combustion

Климов, А. И.; Bityurin, V. A.

doi:10.2514/6.2003-698

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…Various types of plasma discharges have shown promising characteristics in different applications including flow control in aerodynamics [5][6][7], ignition and combustion in propulsion engineering [8][9][10][11][12][13], stabilization of flames [14][15][16][17]. Characteristic propane ignition and combustion times in the supersonic flow with Mach number 2 could be decreased up to factor 2-5 by plasma-assisted combustion [8,9]. Influence of the energy input of a microwave discharge on shock-wave structures and the flow around a body in a supersonic flow and the optimal discharge parameters to achieve the aerodynamic effect are studied in [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Булат

Esakov

Grachev

et al. 2021

IEEE Trans. Plasma Sci.

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Streamers are non-thermal filamentary plasmas developing in insulating mediums under the influence of strong external electric field. The subcritical streamer discharge is formed by a field with the intensity smaller than the minimum intensity leading to the air breakdown, and breakdown conditions are created by special initiators. Air breakdown in sub-and supersonic flows induced by the subcritical streamer discharge and the effect of the initiator shape on breakdown conditions are studied. The intensity of electric field of subcritical streamer induced breakdown has been shown to be smaller compared to that initiated by microwave discharge without initiator. The dependencies of critical intensity of the electric field on the pressure and location of initiator are reported. The air breakdown conditions are found at various dimensions of the metallic screen near which the initiator is installed.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Булат

Esakov

Grachev

et al. 2021

IEEE Trans. Plasma Sci.

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“…The core is to decouple the flame heat release rate and pressure pulsation through the addition of interference signals or changing the design of the acoustic structure. In recent years, the rapid development of plasma-assisted combustion (PAC) technology [5][6][7][8][9][10] has given us important insights. In 2004, Klimov et al [9] conducted a plasma combustion-supporting experiment, and the results showed that the addition of plasma made the propane flame burn stably without being blown out at a higher gas flow rate, and enhanced the flame blow-out limit.…”

Section: Introductionmentioning

confidence: 99%

Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma

et al. 2021

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The effects of plasma on the combustion instability of a methane swirling premixed flame under acoustic excitation were investigated. The flame image of OH planar laser-induced fluorescence and the fluctuation of flame transfer function showed the mechanism of plasma in combustion instability. The results show that when the acoustic frequency is less than 100 Hz, the gain in flame transfer function gradually increases with the frequency; when the acoustic frequency is 100~220 Hz, the flame transfer function shows a trend of first decreasing and then increasing with acoustic frequency. When the acoustic frequency is greater than 220 Hz, the flame transfer function gradually decreases with acoustic frequency. When the voltage exceeds the critical discharge value of 5.3 kV, the premixed gas is ionized and the heat release rate increases significantly, thereby reducing the gain in flame transfer function and enhancing flame stability. Plasma causes changes in the internal recirculation zone, compression, and curling degree of the flame, and thereby accelerates the rate of chemical reaction and leads to an increase in flame heat release rate. Eventually, the concentration of OH radicals changes, and the heat release rate changes accordingly, which ultimately changes the combustion instability of the swirling flame.

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“…As demonstrated by Kim and colleagues [19] and Rosocha and co-workers [20], in such plasmas, electron temperatures lower than 12 eV can break down the fuel species producing free radicals. To date, several DBD-PAs have been investigated to improve the fuel/air mixtures ignition [21][22][23], increase flame propagation [24,25], or enhance flame stabilization by extending flammability limits [26][27][28][29][30][31]. Concerning this last aspect, combustion enhancement has been observed when applying a DBD-PA for fuel/oxidizer decomposition [32,33].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

et al. 2020

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The present work focuses on the impact of dielectric barrier discharge (DBD) plasma actuators (PAs) on non-premixed lifted flame stabilization in a methane CH4-air Bunsen burner. Two coaxial DBD-PA configurations are considered. They are composed of a copper corona, installed on the outer surface of a quartz tube and powered with a high voltage sinusoidal signal, and a grounded needle installed along the burner axis. The two configurations differ in the standoff distance value, which indicates the positioning of the high frequency/high voltage (HV) electrode’s upper edge with respect to the needle tip. Experimental results highlight that flame reattachment is obtained at a lower dissipated power when using a negative standoff distance (i.e., placing the needle upstream with respect to the corona). At 11 kV peak-to-peak voltage and 20 kHz frequency, plasma actuation allowed for reattaching the flame with a very low dissipated power (of about 0.05 W). Numerical simulations of the electrostatic field confirmed that this negative standoff configuration has a beneficial effect on the momentum sources, which oppose the flow and show that the highest electric field extends into the inner quartz tube, as confirmed by experimental visualization close to the needle tip. The modeling predicted an increase in the gas temperature of about 21.8 °C and a slight modification of the fuel composition at the burner exit. This impacts the flame speed with a 10% increase close to the stoichiometric conditions with respect to the clean configuration.

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External and Internal Plasma- Assisted Combustion

Cited by 7 publications

References 4 publications

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Experimental Study of Air Breakdown Induced by Subcritical Streamer Microwave Discharge

Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

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