Active Control of Large Amplitude Combustion Oscillations using Nanosecond Repetitively Pulsed Plasmas

Shanbogue, Santosh; Weibel, Drew; Campo, Felipe Gomez del; Guerra-Garcia, Carmen; Ghoniem, Ahmed F.

doi:10.2514/6.2022-1450

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…While attributing this to fluctuations in the gas condition, they do not directly investigate how these fluctuations are related to measurable properties of the combustion operation. In the work by Shanbhogue et al [6,22], there is also an observation of multiple regimes at the same electrical conditions. The present work elaborates on the causes of this multiple regime behavior.…”

Section: Introductionmentioning

confidence: 96%

Dynamic response of nanosecond repetitively pulsed discharges to combustion dynamics: regime transitions driven by flame oscillations

Pavan,

Shanbhogue,

Weibel

et al. 2024

Plasma Sources Sci. Technol.

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When using nanosecond repetitively pulsed discharges to actuate on dynamic combustion instabilities, the environment the discharge is created in is unsteady and changing on the timescale of the combustion processes. As a result, individual discharge pulses are triggered in a background gas that evolves at the timescale of combustion dynamics, and pulse-to-pulse variations may be observed during the instability cycle. Prior work has studied nanosecond pulsed discharges in pin-to-ring configurations used to control instabilities in lean-operating swirl-stabilized combustors, and observed variable discharge behaviour. The focus of this work is on characterizing how the pulse-to-pulse discharge morphology, energy deposition, and actuation authority, evolve during the combustion instability cycle. This has important implications for designing effective plasma-assisted combustion control schemes. The discharge is observed in two distinct modes, a streamer corona and a nanosecond spark, with the occurrence of each regime directly linked to the phase of the combustor instability. Variation of pulse repetition frequency affects the total fraction of pulses in each mode, while variation of voltage affects the onset of the nanosecond spark mode. The transitions are described in terms of ratios of the relevant combustion and plasma timescales and the implications of this coupled interaction on the design of an effective control scheme is discussed.

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Section: Introductionmentioning

confidence: 96%

Dynamic response of nanosecond repetitively pulsed discharges to combustion dynamics: regime transitions driven by flame oscillations

Pavan,

Shanbhogue,

Weibel

et al. 2024

Plasma Sources Sci. Technol.

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“…[15] and the mitigation of thermo-acoustic instabilities was studied in Refs. [16]- [18]. A few works report experiments closer to practical applications such as the LBO extension in a swirlstabilized burner using liquid dodecane in [19], or gaseous methane at high-pressure [20].…”

Section: Introductionmentioning

confidence: 99%

Lean Flame Stabilization With Nanosecond Plasma Discharges in a Gas Turbine Model Combustor

Blanchard,

Roqué,

Scouflaire

et al. 2024

Journal of Engineering for Gas Turbines and Power

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This paper presents an experimental study of lean flames stabilization with nanosecond repetitively pulsed discharges. The two-stage, swirled-stabilized, multipoint injector BIMER operates at atmospheric pressure with methane-air mixtures in the present study. It is representative in its design of a realistic lean premixed prevaporized injector of gas turbine engines operated at a lab-scale level. The lean blow-off extension with plasma is characterized. The combustion efficiency and the pollutant emissions are quantified near blow-off with and without plasma for 50-kW flames. We show that it is possible to stabilize lean flames down to an equivalence ratio of 0.3, with less than 5 ppm of NOX emitted, thanks to NRP discharges with an electric power that represents less than 0.25% of the flame thermal power. This study also clearly shows that it is necessary to account for the plasma system integration at the early stage of the combustor design to fully benefit from the plasma stabilizing effects on the flame.

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“…Changes in discharge structure driven by gas condition are particularly relevant in situations involving transient combustion phenomena and moving flame fronts where in-situ generated plasma for PAC may be of interest. Examples include internal combustion engines, rotating detonation engines and static or dynamic flame stability studies [12,[42][43][44][45]. While there is considerable work looking at how plasma affects combustion processes, the other side of the interaction, namely how the discharge is affected by the transient combustion environment, has been studied considerably less.…”

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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Active Control of Large Amplitude Combustion Oscillations using Nanosecond Repetitively Pulsed Plasmas

Cited by 7 publications

References 25 publications

Dynamic response of nanosecond repetitively pulsed discharges to combustion dynamics: regime transitions driven by flame oscillations

Dynamic response of nanosecond repetitively pulsed discharges to combustion dynamics: regime transitions driven by flame oscillations

Lean Flame Stabilization With Nanosecond Plasma Discharges in a Gas Turbine Model Combustor

Nanosecond pulsed discharge dynamics during passage of a transient laminar flame

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