Stabilization of lean flames with nanosecond discharges in a gas turbine model combustor

Blanchard, Victorien P.; Roqué, Frédéric; Scouflaire, Philippe; Laux, Christophe O.; Ducruix, Sébastien

doi:10.2514/6.2023-2387

Cited by 1 publication

(1 citation statement)

References 21 publications

(31 reference statements)

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“…limits (i.e. lean blowout limits) [8][9][10][11][12]. These improvements are typically achieved by using a nanosecond repetitively pulsed (NRP) discharge strategy.…”

Section: Introductionmentioning

confidence: 99%

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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“…limits (i.e. lean blowout limits) [8][9][10][11][12]. These improvements are typically achieved by using a nanosecond repetitively pulsed (NRP) discharge strategy.…”

Section: Introductionmentioning

confidence: 99%