Influence analysis of electronically and vibrationally excited particles on the ignition of methane and hydrogen under the conditions of a gas turbine engine

Deminskii, M. A.; Konina, K M; Потапкин, Б. В.

doi:10.1088/1361-6463/aaa9d7

Cited by 3 publications

(5 citation statements)

References 27 publications

(59 reference statements)

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“…The gain of the transfer function obtained for plasma forcing is found to be up to 5 times higher than for acoustic forcing [19]. Recently, plasma-assisted combustion of hydrogen-air and methane-air mixtures under high pressure and in the range of initial temper atures T = 500-900 K was investigated using numerical simulations using an updated plasma-chemical mechanism [20]. It was also demonstrated that DBD-assisted combustion could lead to low pollutant emissions [21].…”

Section: Introductionmentioning

confidence: 98%

“…Generally, plasma discharges may act on the flame through thermal, chemical, and electric field effects, affecting diffusive transport of ions as well as the hydrodynamic field. Plasmas have been demonstrated to extend the lean flammability limit of premixed flames [20] by affecting the ignition process. Since plasma produces heat, electrons, long-lifetime intermediate species, radicals, ions, excited molecules, fuel fragments, ionic wind, a large density gradient, and Coulomb and Lorentz force, it can affect ignition and combustion mainly via three different pathways: thermal, kinetic, and transport (including aerodynamic) [14], which often act in combination.…”

Section: Introductionmentioning

confidence: 99%

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Flame lift-off height control by a combined vane-plasma swirler

Jiang

Chen

et al. 2018

J. Phys. D: Appl. Phys.

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In this study, a swirler combining the vane swirler and the plasma swirler is designed to control the flame lift-off height. The plasma swirler is located near the rim of the injector and the vane swirler is placed upstream of the plasma swirler. The vane swirler is employed to form a divergent flow to sustain the detached flame and the plasma swirler is adopted to control the flame lift-off height. The ionic wind clinging to the inner wall of the injector tube does not penetrate into the center, leaving the main stream flow in the central region largely undisturbed. Characteristics of the flow field are analyzed from the results of laser Doppler anemometry (LDA) measurement and mechanism of the flame lift-off control by the combined vane-plasma swirler is revealed. The flame lift-off locations calculated from the LDA measurement are consistent with those from direct observation. The dielectric barrier discharge (DBD) voltage influences the height of the flame lift-off with a linear relationship observed, which means the flame lift-off height can be controlled precisely by the DBD voltage without any mechanical movement or changing the mass flow rate. The combined vane-plasma swirler has the potential to improve the fuel flexibility, increase flame stability and attenuate the injector overheating. Highlights 1. A combined vane-plasma swirler is designed to control the flame lift-off height. 2. Flame lift-off height can be adjusted by changing the voltage of the dielectric barrier discharge. 3. A linear relationship between flame lift-off height and the dielectric barrier discharge voltage is observed. 4. Flame lift-off control by the combined vane-plasma swirler is mainly associated with the aerodynamic effect. 5. The swirler can improve fuel flexibility, increase flame stability and attenuate injector overheating.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Flame lift-off height control by a combined vane-plasma swirler

Jiang

Chen

et al. 2018

J. Phys. D: Appl. Phys.

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“…It has been reported that different particles in the plasma influence ignition through different paths. Excited by the low E/N, the vibrationally excited species enhance ignition mainly by generating thermal path due to rapid relaxation reactions [27] and the electronically excited species O 2 (a 1 ∆ g ) and O 2 (b 1 Σ g + ) accelerate the chain branching reactions effectively [28]. Abundant plasma energy deposits into the electronic excitation, the dissociation and the ionization, producing chemical reactive particles to benefit ignition via kinetic effect when the E/N exceeds 100 Td [29].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on plasma assisted ignition of methane/air mixture excited by the synergistic nanosecond repetitive pulsed and DC discharge

Shi¹,

Chen²,

Chen³

et al. 2020

J. Phys. D: Appl. Phys.

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Plasma assisted combustion provides possibilities for reducing ignition delays and controlling pollutant emissions. The zero-dimensional plasma and combustion models have been built up to numerically investigate the effects of the synergistic nanosecond repetitive pulsed (NRP) and DC discharge on the methane/air plasma assisted ignition. The synergistic discharge means exerting the low voltage DC discharge after the NRP discharge in one period of the discharge plasma. The simulation results indicate that the selective excitation of the vibrationally excited species N2(v), O2(v) and CH4(v) as well as the electronically excited species O2(a1Δg) and O2(b1Σg +) by the synergistic discharge is superior to that by the NRP discharge when the electron energy has been deposited into different molecular degrees of freedom. The plasma kinetic effect on the ignition enhancement is highly efficient since it can break though the threshold of the thermal effect. Both the kinetic effect and the thermal effect of the NRP discharge on ignition enhancement are relatively weaker than those of the synergistic discharge. Besides, reactions involved the N2 electronically excited species produce abundant O and H, which is conducive to the formation of the methane oxidation intermediates. e + O2 = e + O + O(1D) in the NRP discharge and e + O2 = e + O2(a1Δg) in the synergistic discharge play the crucial roles in the methane/air plasma enhance ignition, respectively.

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“…21 Deminskii et al studied influences of electronically excited species and vibrationally excited species on the NPD plasma-assisted combustion of methane−air and hydrogen−air in the initial temperature range of 500−900 K. It has been shown that the quenching of electronically excited nitrogen leads to the dissociation of the methane molecule at the early stage of combustion. 22 height. 23 De Giorgi et al investigated the effects of the DBD plasma on methane decomposition for the combustion enhancement of the lean flame.…”

Section: Introductionmentioning

confidence: 99%

“…It has been found that the NPD plasma produces active species, i.e., oxygen atoms, causing accelerations of chain reactions and ignition processes . Deminskii et al studied influences of electronically excited species and vibrationally excited species on the NPD plasma-assisted combustion of methane–air and hydrogen–air in the initial temperature range of 500–900 K. It has been shown that the quenching of electronically excited nitrogen leads to the dissociation of the methane molecule at the early stage of combustion . Vincent-Randonnier et al established a coaxial DBD burner that has a metallic needle located at the axis of the shell and is connected to the alternating current high-voltage power supply.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on Methane–Air Nanosecond Pulsed Dielectric Barrier Discharge Plasma-Assisted Combustion

et al. 2020

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Plasma-assisted combustion is a promising approach to achieve fast ignition and highly efficient combustion. In this work, methane−air nanosecond pulsed dielectric barrier discharge plasma-assisted combustion is numerically investigated by combining a homemade plasma model with the combustion model of software CHEMKIN-PRO. Effects of varying applied voltage amplitudes on the characteristic parameters of the plasma-assisted planar shear flow combustion as well as the reaction pathway maps of not only the nanosecond pulsed dielectric barrier discharge plasma but also the combustions without and with plasma assistance are systematically illustrated and analyzed. The simulation results indicate that under the combined action of increasing electric field intensity and increasing charged particle densities, the peak value of the discharge current density increases, and the peak time of the discharge current density is brought forward with the increase of the applied voltage amplitude. The temperature reaches its peak value earlier in the methane−air combustion with plasma assistance than without plasma assistance. The maximum temperature reduces to around 1900 K when the applied voltage amplitude is higher than 11 kV. There are emerging pathways to generate hydrocarbons C 2 H 4 and C 2 H 2 in the plasma-assisted combustion, the reactions of CH 4 on CH and C 2 H on H 2 , respectively. The reactions involving active species such as H play a significant role in the plasma-assisted combustion, which causes an obvious decrease in the densities of these active species with plasma assistance.

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Influence analysis of electronically and vibrationally excited particles on the ignition of methane and hydrogen under the conditions of a gas turbine engine

Cited by 3 publications

References 27 publications

Flame lift-off height control by a combined vane-plasma swirler

Flame lift-off height control by a combined vane-plasma swirler

Numerical investigation on plasma assisted ignition of methane/air mixture excited by the synergistic nanosecond repetitive pulsed and DC discharge

Numerical Investigations on Methane–Air Nanosecond Pulsed Dielectric Barrier Discharge Plasma-Assisted Combustion

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