Dynamics of a Lean Flame Stabilized by Nanosecond Discharges

Blanchard, Victorien P.; Minesi, Nicolas; Stepanyan, Sergey; Stancu, Gabi-Daniel; Laux, Christophe O.

doi:10.2514/6.2021-1700

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…3. Experimental spectra of the N2(C→B) (0,2) and (1,3) vibrational bands are fitted with the line-by-line radiation solver SPECAIR [36] to determine the rotational temperature during the burst of discharges as done in [37].…”

Section: Experimental Setup and Numerical Modeling A Experimental Set...mentioning

confidence: 99%

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Experimental and numerical characterization of a lean premixed flame stabilized by nanosecond discharges

Blanchard

Minesi

Bechane

et al. 2022

AIAA SCITECH 2022 Forum

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This article presents a joint experimental and numerical analysis of a lean turbulent premixed methane-air flame stabilized by nanosecond repetitively pulsed discharges. In the experiments, the transient effects of the discharge on combustion are quantified by optical diagnostics to characterize their impact on flame stabilization. The flame shape is studied with OH* chemiluminescence imaging and the temperature is measured by optical emission spectroscopy. In parallel, Large Eddy Simulation (LES) of the turbulent premixed flame is conducted. Combustion chemistry is modeled by an analytically reduced mechanism whereas the plasma discharge is described by a semi-empirical model. The comparison between experiments and simulations validates the numerical methodology.

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Section: Experimental Setup and Numerical Modeling A Experimental Set...mentioning

confidence: 99%

“…In Refs. [37][38], the discharge emission was characterized at steady state (i.e. with discharges continuously applied at 20 kHz).…”

Section: B Flame Shape Development During the Burst Of Dischargesmentioning

confidence: 99%

Experimental and numerical characterization of a lean premixed flame stabilized by nanosecond discharges

Blanchard

Minesi

Bechane

et al. 2022

AIAA SCITECH 2022 Forum

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“…This suggests that any difference in heating caused by the discharge was small. This is compared to the maximum temperature rise that could be obtained if all the electrical energy was deposited as heat, calculated by equation (2).…”

Section: Temperature Measurements Using Oesmentioning

confidence: 99%

“…the combustion processes in multiple ways, and has shown particular promise in enabling or stabilizing combustion in difficult regimes near flammability limits. These include lean flammability limit extension and stabilization of lean flames [1][2][3][4][5] and low residence time high-speed or supersonic combustion [6][7][8][9]. In the related field of plasma assisted ignition, the application of plasma has been shown to reduce ignition delay times [10][11][12][13] and enhance low-temperature chemistry [14,15].…”

Section: Introductionmentioning

confidence: 99%

Nanosecond pulsed discharge dynamics during passage of a transient laminar flame

Pavan

Guerra-Garcia

2022

Plasma Sources Sci. Technol.

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This work presents an experimental study of a nanosecond repetitively pulsed dielectric barrier discharge interacting with a transient laminar ﬂame propagating in a channel of height near the quenching distance of the ﬂame. The discharge and the ﬂame are of comparable size, and the discharge is favoured at a location where it is coupled with the reaction zone and burned gas. The primary goal is to determine how the discharge evolves on the time scale of the ﬂame passage, with the evolution driven by the changing gas state produced by the moving ﬂame front. This work complements the large body of work investigating the eﬀect of plasma to modify ﬂame dynamics, by considering the other side of the interaction (how the discharge is modiﬁed by the ﬂame). The hot gas produced by the combustion had a strong eﬀect on the discharge, with the discharge preferentially forming in the region of hot combustion products. The per-pulse energy deposited by the discharge was measured and found to increase with the size of the discharge region and applied voltage. The pulse repetition frequency did not have a direct impact on the per-pulse energy, but did have an eﬀect on the morphology and size of the discharge region. Two distinct discharge regimes were observed: uniform and ﬁlamentary (microdischarges). Higher pulse repetition frequencies and faster-cooling combustion products were more likely to transition to the ﬁlamentary regime, while lower frequencies and slower-cooling combustion products maintained a uniform regime for the entirety of the time the discharge was active. This regime transition was inﬂuenced by the ratio of the time scale of ﬂuid motion to the pulse repetition rate (with no noticeable impact caused by the reduced electric ﬁeld), with the ﬁlamentary regime preferentially observed in situations where the ratio was small.

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“…The plasma interacts with the combustion processes in multiple ways, and has shown particular promise in enabling or stabilizing combustion in difficult regimes near flammability limits. These include lean flammability limit extension and stabilization of lean flames [1,2,3,4,5] and low residence time high-speed or supersonic combustion [6,7,8,9]. In the related field of plasma assisted ignition (PAI), the application of plasma has been shown to reduce ignition delay times [10,11,12,13] and enhance low-temperature chemistry [14,15].…”

Section: Introductionmentioning

confidence: 99%

Nanosecond Pulsed Discharge Dynamics During Passage of a Transient Laminar Flame

Pavan¹,

Guerra-Garcia²

2021

Preprint

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This work presents an experimental study of a nanosecond repetitively pulsed dielectric barrier discharge interacting with a transient laminar flame propagating in a channel of height near the quenching distance of the flame. The discharge and the flame are of comparable size, and the discharge is favoured at a location where it is coupled with the reaction zone and burned gas. The primary goal is to determine how the discharge evolves on the time scale of the flame passage, with the evolution driven by the changing gas state produced by the moving flame front. This work complements the large body of work investigating the effect of plasma to modify flame dynamics, by considering the other side of the interaction (how the discharge is modified by the flame). The hot gas produced by the combustion had a strong effect on the discharge, with the discharge preferentially forming in the region of hot combustion products. The per-pulse energy deposited by the discharge was measured and found to increase with the size of the discharge region and applied voltage. The pulse repetition frequency did not have a direct impact on the per-pulse energy, but did have an effect on the morphology and size of the discharge region. Two distinct discharge regimes were observed: uniform and filamentary (microdischarges). Higher pulse repetition frequencies and faster-cooling combustion products were more likely to transition to the filamentary regime, while lower frequencies and slower-cooling combustion products maintained a uniform regime for the entirety of the time the discharge was active. This regime transition was influenced by the ratio of the time scale of fluid motion to the pulse repetition rate (with no noticeable impact caused by the reduced electric field), with the filamentary regime observed in situations where the ratio was small. This work demonstrates the importance of considering how the discharge properties will change due to combustion processes in applications utilizing plasma assistance for transient combustion systems.

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Dynamics of a Lean Flame Stabilized by Nanosecond Discharges

Cited by 8 publications

References 27 publications

Experimental and numerical characterization of a lean premixed flame stabilized by nanosecond discharges

Experimental and numerical characterization of a lean premixed flame stabilized by nanosecond discharges

Nanosecond pulsed discharge dynamics during passage of a transient laminar flame

Nanosecond Pulsed Discharge Dynamics During Passage of a Transient Laminar Flame

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