Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Fang, Jianfeng; Wu, Xiaomin; Duan, Hao; Li, Chao; Gao, Zhongquan

doi:10.3390/en8042587

Cited by 20 publications

(10 citation statements)

References 33 publications

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“…The appearance of the ionic wind effect makes the flame surface unstable due to fluid dynamics. Fang et al and Duan et al used similar experimental devices to study the combustion under an electric field with the spherical flame method [26][27]. Experimental studies have found that the application of voltage can increase the stretching and burning rate of the flame.…”

Section: Spherical Flame Propagation Methodsmentioning

confidence: 99%

A Comprehensive Review of the Influence of Electric Field on Flame Characteristics

Yin¹,

Li²,

Yan³

et al. 2020

Preprint

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Electric field assisted combustion is an important means to improve fuel combustion efficiency. This paper conducts extensive research on flame characteristics under different forms and different application methods of electric fields, emission of soot particles and simulation status. Different flame parameter measurement methods will lead to different degrees of error, and perfect numerical simulation can make simple predictions on experimental data. Most of the current numerical simulations are in two dimensions, and it is necessary to develop a complete and accurate three-dimensional model to simulate and predict the characteristics of the flame under an electric field. The emission of soot particles is also affected by the electric field, and reasonable electric field parameters can greatly reduce the emission of soot particles. It is recommended to conduct centralized measurement of different fuels under the electric field under high pressure and temperature conditions, so as to be able to develop a wider and more accurate flame dynamics and chemical model under the electric field.

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Section: Spherical Flame Propagation Methodsmentioning

confidence: 99%

A Comprehensive Review of the Influence of Electric Field on Flame Characteristics

Yin¹,

Li²,

Yan³

et al. 2020

Preprint

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“…Research on the effects of a dc field on a hydrocarbon flame has been done by many researchers [12][13][14][15][16][17][18][19]. Results have shown the electric field capable of increased lean blowoff limits, increased flame burning velocity, decreased emissions and soot formation, and enhanced flame stability.…”

Section: Nomenclaturementioning

confidence: 99%

Electric Field Damping of Rijke Tube Combustion Instabilities

Henderson

2018

Journal of Propulsion and Power

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A direct-current electric field was investigated as a damping method for thermoacoustic instabilities generated in a horizontal Rijke tube driven by a premixed propane torch. Electrode lengths of 2.54, 5.08, and 15.24 cm were used with electrode locations relative to the burner tip of −4.60, −2.06, and 0.458 cm and voltages up to 4.68 kV being tested. Electrodes downstream of the burner tip, rather than surrounding the burner, and longer electrodes were most effective at damping instabilities. Damping also increased with applied voltage. These findings held true for both laminar and turbulent flames and were in agreement with theoretical predictions made based on two-dimensional static electric field models. Sound pressure level reductions up to 21 dB for the laminar flame, which completely damped the instability, and 4.4 dB for the turbulent flame were seen using the 15.24 cm electrode at 4.68 kV. When the entire Rijke tube acted as the electrode, a reduction of 19 dB was seen for the turbulent flame at 9 kV, which suppressed the instability. The damping effect was attributed to stabilization of the oscillating flame and its unsteady heat release, driven by the combustion instability pressure fluctuations, via the ionic wind.

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“…Previous studies [30,31,38] have verified that our electrode arrangement could only produce an approximately uniform electric field between the ignition and the mesh electrode, and a u was about 0.7 in the main study zone for −2.5 kV and −5 kV electric field.…”

Section: Governing Equationsmentioning

confidence: 99%

Deformation Study of Lean Methane-Air Premixed Spherically Expanding Flames under a Negative Direct Current Electric Field

et al. 2016

Energies

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This paper compares numerical simulations with experiments to study the deformation of lean premixed spherically expanding flames under a negative direct current (DC) electric field. The experiments, including the flame deformation and the ionic distribution on the flame surface were investigated in a mesh to mesh electric field. Besides, a numerical model of adding an electric body force to the positive ions on the flame surface was also established to perform a relevant simulation. Results show that the spherical flame will acquire an elliptical shape with a marked flame stretch in the horizontal direction and a slight inhibition in the vertical direction under a negative DC electric field. Meanwhile, a non-uniform ionic distribution on the flame surface was also detected by the Langmuir probe. The simulation results from the numerical model show good agreement with experimental data. According to the velocity field analysis in simulation, it was found the particular motion of positive ions and neutral molecules on the flame surface should be responsible for the special flame deformation. When a negative DC electric field was applied, the majority of positive ions and colliding neutral molecules will form an ionic flow along the flame surface by a superposition of the electric field force and the aerodynamic drag. The ionic flow was not uniform and mainly formed on the upper and lower sides, so it will lead to a non-uniform ionic distribution along the flame surface. What's more, this ionic flow will also induce two vortexes both inside and outside of the flame surface due to viscosity effects. The external vortexes could produce an entraining effect on the premixed gas and take away the heat from the flame surface by forced convection, and then suppress the flame propagation in the vertical direction, while, the inner vortexes would scroll the burned zones and induce an inward flow at the horizontal center, which could be the reason for the pitted structure at the horizontal center when a high voltage was applied.

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Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Cited by 20 publications

References 33 publications

A Comprehensive Review of the Influence of Electric Field on Flame Characteristics

A Comprehensive Review of the Influence of Electric Field on Flame Characteristics

Electric Field Damping of Rijke Tube Combustion Instabilities

Deformation Study of Lean Methane-Air Premixed Spherically Expanding Flames under a Negative Direct Current Electric Field

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