Low-temperature ignition of methane-air mixtures under the action of nonequilibrium plasma

Deminskii, M. A.; Chernysheva, I. V.; Umanskii, S. Ya.; Strelkova, M. I.; Baranov, Alexey; Кочетов, И. В.; Napartovich, A. P.; Sommerer, Timothy J.; Saddoughi, Seyed G.; Herbon, John T.; Потапкин, Б. В.

doi:10.1134/s1990793113040040

Cited by 23 publications

(21 citation statements)

References 75 publications

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“…11. In line with findings of earlier studies[1,[90][91][92], reactions of methylperoxyl radicals are found to be important. The methane oxidation rate and even more so the formation of methanol and formaldehyde are sensitive to the reactions of CH 3 OO with both stable species (CH 2 O, CH 4 ) and radicals (HO 2 and CH 3 ).…”

supporting

confidence: 87%

High-pressure oxidation of methane

Hashemi

Christensen

Gersen

et al. 2016

Combustion and Flame

175

128

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Methane oxidation at high pressures and intermediate temperatures was investigated in a laminar flow reactor and in a rapid compression machine (RCM). The flow-reactor experiments were conducted at 700-900 K and 100 bar for fuel-air equivalence ratios (Φ) ranging from 0.06 to 19.7, all highly diluted in nitrogen. It was found that under the investigated conditions, the onset temperature for methane oxidation ranged from 723 K under reducing conditions to 750 K under stoichiometric and oxidizing conditions. The RCM experiments were carried out at pressures of 15-80 bar and temperatures of 800-1250 K under stoichiometric and fuel-lean (Φ=0.5) conditions. Ignition delays, in the range of 1-100 ms, decreased monotonically with increasing pressure and temperature.

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supporting

confidence: 87%

High-pressure oxidation of methane

Hashemi

Christensen

Gersen

et al. 2016

Combustion and Flame

175

128

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“…Most of the recent work has focused on non-equilibrium plasmas generated by nanosecond pulse discharges, and reviews of this work are given in [28,29]. Recent work on ignition by nanosecond discharges has included both experimental [30][31][32] and numerical [24,30,[32][33][34] studies of the effect of the plasma chemistry and electrodynamics. Also, recent advancements have been made on measuring and modeling ignition by transient plasma streamer discharge [35,36].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of electrode geometry on spark ignition

Bane

Ziegler

Shepherd

2015

Combustion and Flame

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High-speed schlieren visualization and numerical simulations are used to study the fluid mechanics following a spark discharge and the effect on the ignition process in a hydrogen-air mixture. A two-dimensional axisymmetric model of spark discharge in air and spark ignition was developed using the non-reactive and reactive Navier-Stokes equations including mass and heat diffusion. The numerical method employs structured adaptive mesh refinement software to produce highly-resolved simulations, which is critical for accurate resolution of all the physical scales of the complex fluid mechanics and chemistry. The simulations were performed with three different electrode geometries to investigate the effect of the geometry on the fluid mechanics of the evolving spark kernel and on flame formation. The computational results were compared with high-speed schlieren visualization of spark and ignition kernels. It was shown that the spark channel emits a blast wave that is spherical near the electrode surfaces and cylindrical near the center of the spark gap, and thus is highly influenced by the electrode geometry. The ensuing competition between spherical and cylindrical expansion in the spark $ Full-length article submitted to Combustion and Flame.

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“…We calculated using the EEDF code [17]. Self-consistent sets of elastic and inelastic electron cross sections for methane, ethane and propane were taken from [18], [19] and [20], respectively. Using these cross sections, good agreement was obtained between calculations and measurements both for the electron transport and rate coefficients in these gases.…”

Section: Numerical Analysis and Discussionmentioning

confidence: 99%

“…The electron energy distribution was obtained from a numerical solution of the Boltzmann equation in the local, two-term approximation using the American Institute of Aeronautics and Astronautics EEDF code [17]. The sets of electron cross sections for methane, ethane and propane were taken from [18], [19] and [20], respectively. Partial ionization cross sections for these molecules were taken from [25].…”

Section: Ion Composition In Discharge and Its Afterglowmentioning

confidence: 99%

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

Starikovskiy

2016

47th AIAA Plasmadynamics and Lasers Conference

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The results of the experimental and numerical study of high-voltage nanosecond discharge afterglow in pure methane, ethane and propane are presented for room temperature and pressures from 2 to 20 Torr. Time-resolved electron density during the plasma decay was measured with a microwave interferometer for initial electron densities in the range between 3×10 11 and 3×10 12 cm -3 and the effective recombination coefficients were obtained. Measured effective recombination coefficients increased with gas pressure and were much higher than the recombination coefficients for simple molecular hydrocarbon ions. The properties of plasma in the discharge afterglow were numerically simulated by solving the balance equations for charged particles and electron temperature. Calculations showed that electrons had time to thermalize prior to the plasma decay. The assumption that cluster hydrocarbon ions are formed during the plasma decay explained the pressure dependence of the measured effective recombination coefficients. It was shown that the loss of electrons was controlled by the dissociative recombination with cluster ions at room electron temperature. Based on the analysis of the experimental data, the rates of three-body formation of cluster ions and recombination coefficients for these ions were estimated.

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Low-temperature ignition of methane-air mixtures under the action of nonequilibrium plasma

Cited by 23 publications

References 75 publications

High-pressure oxidation of methane

High-pressure oxidation of methane

Investigation of the effect of electrode geometry on spark ignition

Comparative Study of Nonequilibrium Plasma Generation and Plasma-Assisted Ignition for Different C2 Hydrocarbons

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