Characteristics of a Gliding Arc Discharge Under the Influence of a Laminar Premixed Flame

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Characteristics of a Gliding Arc Discharge Under the Influence of a Laminar Premixed Flame. / Kong, Chengdong; Gao, Jinlong; Zhu, Jiajian; Ehn, Andreas; Alden, Marcus; Li, Zhongshan.

In: IEEE Transactions on Plasma Science, Vol. 47, No. 1, 2019, p. 403-409.

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TY - JOUR

T1 - Characteristics of a Gliding Arc Discharge Under the Influence of a Laminar Premixed Flame

AU - Kong, Chengdong

AU - Gao, Jinlong

AU - Zhu, Jiajian

AU - Ehn, Andreas

AU - Alden, Marcus

AU - Li, Zhongshan

PY - 2019

Y1 - 2019

N2 - The effect of combustion on a gliding arc (GA) discharge is investigated using simultaneous measurements of current and voltage waveforms, as well as imaging and spectroscopic analysis of plasma and flame luminescence. Attributed to the existence of flame, the breakdown voltage and current peak are reduced and the bright sparks during breakdown are dampened. The intrinsic reason is largely owing to the thermal effect of flame. Electrical breakdown is mainly determined by the reduced electric field strength (E/N), which is inversely proportional to temperature. Assuming a constant E/N for breakdown, the combustion-induced temperature increment gives rise to a reduction of the breakdown voltage. The gas composition seems to have less impact on the breakdown voltage. However, the addition of CH₄ can induce more radicals (e.g., H atoms) that enhance the intensity of relevant spectral emissions, especially from OH*. Due to the transport of relatively long-lived radicals, the width of the plasma column of the GA discharge is broadened to form a local reaction zone, serving as a flame holder. Interestingly, the plasma channel moves more smoothly as the flame is present. It implies that the flow field is less turbulent owing to combustion.

AB - The effect of combustion on a gliding arc (GA) discharge is investigated using simultaneous measurements of current and voltage waveforms, as well as imaging and spectroscopic analysis of plasma and flame luminescence. Attributed to the existence of flame, the breakdown voltage and current peak are reduced and the bright sparks during breakdown are dampened. The intrinsic reason is largely owing to the thermal effect of flame. Electrical breakdown is mainly determined by the reduced electric field strength (E/N), which is inversely proportional to temperature. Assuming a constant E/N for breakdown, the combustion-induced temperature increment gives rise to a reduction of the breakdown voltage. The gas composition seems to have less impact on the breakdown voltage. However, the addition of CH₄ can induce more radicals (e.g., H atoms) that enhance the intensity of relevant spectral emissions, especially from OH*. Due to the transport of relatively long-lived radicals, the width of the plasma column of the GA discharge is broadened to form a local reaction zone, serving as a flame holder. Interestingly, the plasma channel moves more smoothly as the flame is present. It implies that the flow field is less turbulent owing to combustion.

KW - Atmospheric modeling

KW - Combustion

KW - Discharges (electric)

KW - Electrodes

KW - Fires

KW - Flame-plasma interaction

KW - gliding arc (GA) discharge

KW - Plasmas

KW - stabilization of discharge

KW - thermal effect.

U2 - 10.1109/TPS.2018.2877126

DO - 10.1109/TPS.2018.2877126

M3 - Article

VL - 47

SP - 403

EP - 409

JO - IEEE Transactions on Plasma Science

T2 - IEEE Transactions on Plasma Science

JF - IEEE Transactions on Plasma Science

SN - 0093-3813

IS - 1

ER -