Plasma-induced ignition and plasma-assisted combustion in high-speed flow

Leonov, Sergey B.; Yarantsev, Dmitry

doi:10.1088/0963-0252/16/1/018

Cited by 119 publications

(50 citation statements)

References 13 publications

(22 reference statements)

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“…A driving force is the demand to avoid global warming due to the greenhouse effect since more than 80% of fossil fuels are consumed by combustion. Recently, plasmaassisted combustion has been investigated as an innovative technology [1], which is expected to be useful for combustion in a lean-fuel condition [2,3] and in a speedy flow [4][5][6]. In addition, it is considered that plasmas can be utilized for improving the ignition characteristics [7][8][9][10][11] and the stability of flames [12,13].…”

Section: Introductionmentioning

confidence: 99%

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

Sasaki¹,

Sueoka²

2012

J. Phys. D: Appl. Phys.

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Abstract.We found that the burning velocity in premixed burner flame was enhanced by heated electrons in the flame. The electron heating was realized by irradiating microwave power onto the flame, and was confirmed by observing optical emission intensity of molecular nitrogen at the second positive system. Since the increase of the observed gas temperature was negligible, the enhancement of the burning velocity can be attributed to the nonequilibrium combustion chemistry which is driven by energetic electrons. We examined the time constants for the transition between equilibrium and nonequilibrium combustion states by irradiating pulsed microwave power. As a result, we found > 2 × 10 4 s −1 for the frequency of electron heating, ∼ 1 × 10 3 s −1 for the loss frequency of heated electrons, and ∼ (0.5 − 1) × 10 3 s −1 for the loss frequencies of OH and CH radicals.

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Section: Introductionmentioning

confidence: 99%

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

Sasaki¹,

Sueoka²

2012

J. Phys. D: Appl. Phys.

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“…Turbulence flow has been neglected. 6. Although the light absorption can occur in the actual ICTP, this can be omitted as optically thin plasma has been assumed.…”

Section: Hypothesismentioning

confidence: 99%

“…In addition, for the last couple of decades researchers have shown particular interests in applications of non-equilibrium plasma for the problems of plasma assisted ignition and plasma assisted combustion of hydrocarbon fuels [6,7] due to the fact that an electrical discharge's properties strongly depend on the conditions of excitation of discharge, flow parameters and characteristics of supplying electromagnetic power. It has been reported that, by using plasma assistance, the combustion rate can be enhanced, thereby greatly reducing the combustion temperature [8].…”

mentioning

confidence: 99%

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Al-Mamun

Tanaka

Uesugi

2009

Plasma Chem Plasma Process

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Here the authors developed a two-dimensional two-temperature chemical nonequilibrium (2T-NCE) model of Ar-CO 2 -H 2 inductively coupled thermal plasmas (ICTP) around atmospheric pressure (760 torr). Assuming 22 different particles in this model and by solving mass conservation equations for each particle, considering diffusion, convection and net production terms resulting from 198 chemical reactions, chemical non-equilibrium effects were taken into account. Species density of each particle or simply particle composition was also derived from the mass conservation equation of each one taking the non chemical equilibrium effect into account. Transport and thermodynamic properties of Ar-CO 2 -H 2 thermal plasmas were self-consistently calculated using the first order approximation of the Chapman-Enskog method at each iteration point implementing the local particle composition and temperature. Calculations at reduced pressure (500 and 300 torr) were also done to investigate the effect of pressure on non-equilibrium condition. Results obtained by the present model were compared with results from one temperature chemical equilibrium (1T-CE) model, one-temperature chemically non equilibrium (1T-NCE) model and finally with 2T-NCE model of Ar-N 2 -H 2 plasmas. Investigation shows that consideration of non-chemical equilibrium causes the plasma volume radially wider than CE model due to particle diffusion. At low pressure with same input power, presence of diffusion is relatively stronger than at high pressure. Comparison of present reactive model with non-reactive Ar-N 2 -H 2 plasmas shows that maximum temperature reaches higher in reactive C-H-O molecular system than non-reactive plasmas due to extra contribution of reaction heat.

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“…The method of optical spectroscopy is used to measure plasma temperature [18], [19]. Measurements were carried out in the separation zone of the duct at three different values of the mean discharge current: I pl = 16, 10, and 6.5 A.…”

Section: Measurements Of Plasma Temperaturementioning

confidence: 99%

Plasma-Assisted Combustion of Gaseous Fuel in Supersonic Duct

Leonov¹,

Yarantsev²,

Napartovich

et al. 2006

IEEE Trans. Plasma Sci.

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The field of plasma-induced ignition and plasmaassisted combustion in high-speed flow is under consideration. Nonequilibrium, unsteady, and nonuniform modes are analyzed as the most promising in reducing a required extra power. Numerical simulations of uniform, nonequilibrium, continuous, and pulse discharge effect on the premixed hydrogen and ethylene-air mixtures in supersonic flow demonstrate an advantage of such a technique over heating. At the same time, the energetic price occurs rather large to be scheme practical. A reduction of the required power deposition and mixing intensification in nonpremixed flow could be achieved by nonuniform electrical discharges. Experimental results on multielectrode discharge maintenance behind wallstep and in the cavity of supersonic flow are presented. The model test on hydrogen and ethylene ignition is demonstrated at direct fuel injection.

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Plasma-induced ignition and plasma-assisted combustion in high-speed flow

Cited by 119 publications

References 13 publications

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Plasma-Assisted Combustion of Gaseous Fuel in Supersonic Duct

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