Effects of non-thermal plasma on the lean blowout limits and CO/NOx emissions in swirl-stabilized turbulent lean-premixed flames of methane/air

Kim, Gyeong Taek; Yoo, Chun Sang; Chung, Suk Ho; Park, Jeong

doi:10.1016/j.combustflame.2019.11.024

Cited by 38 publications

(25 citation statements)

References 68 publications

(102 reference statements)

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“…The flame shapes and LBO limits (0.5 < φ LBO < 0.54 without PAC) are also similar. Using a dielectric barrier discharge applied continuously, the LBO is reduced down to 0.45 < φ LBO < 0.48 in [5], which is comparable with results of the present work. In [6], a two-stage coaxial swirling injector (propane-air) is used with NRP discharges.…”

Section: Experimental Results For Different Fuelssupporting

confidence: 91%

“…As the air flow rate is increased, the "stem" part of the flame becomes longer, and the "petals" move downstream until LBO occurs. Flame oscillations between two stable flame regions are also reported by Kim et al [5] during LBO characterization of a premixed swirling flame with PAC.…”

Section: Experimental Results For Different Fuelssupporting

confidence: 69%

“…However comparison with the present work is not possible given the difference in flame and flow topologies. The combustor used in [5] is closest to SICCA-Spray. The flame shapes and LBO limits (0.5 < φ LBO < 0.54 without PAC) are also similar.…”

Section: Experimental Results For Different Fuelsmentioning

confidence: 99%

“…Although the lean stability performance of traditional swirling injectors is already quite good, an increase of the lean blow out (LBO) margin is still desirable, especially for operational and safety reasons [1]. For twenty years, plasma-assisted combustion (PAC) has been considered to improve three key areas of combustion: ignition [2], combustion instabilities [3,4] and extinction [5,6]. Recent works in these directions are reviewed in [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…NRP discharges have successfully been used to extend the LBO limit in laboratory scale test rigs, often with minimal modifications to the combustor. The electrode is generally located on the centerline of the burner, close to the injector outlet, inside a gas recirculation zone with low flow velocities [3,5,6,19]. Even in very lean mixtures, well below the extinction limit, a reaction zone is formed in the vicinity of the electrode.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of lean blow out performance of spray and premixed swirled flames using nanosecond repetitively pulsed discharges

Vignat

Minesi

Soundararajan

et al. 2021

Proceedings of the Combustion Institute

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Plasma-Assisted Combustion (PAC) has shown potential in improving the ignition, extinction, and dynamic performance of combustion systems. In this work, Nanosecond Repetitively Pulsed (NRP) spark discharges are applied to extend the lean blow out limit of the SICCA-Spray burner. This laboratory-scale atmospheric test rig is equipped with a swirl spray injector representing in an idealized fashion a single sector of a gas turbine. Three fuels and injection conditions are considered: perfectly premixed methane-air, liquid heptane, and liquid dodecane injected as hollow cone sprays. The optimal electrode position that extends the LBO limit is found to be near the external edge of the outer recirculation zone (ORZ). Spectroscopic measurements show that the NRP sparks produce atomic species and heat the gas above the adiabatic flame temperature. High-speed chemiluminescence images of blow out sequences indicate that the flame evolves similarly for all three fuels from "M" or "V" shapes prevailing at φ = 0.9 to a configuration where chemical conversion also takes place in the ORZ at φ = 0.63. A low frequency combustion oscillation arises near the LBO limit (φ = 0.57). Spray flames blow out at this point, while the plasma-assisted ones continue to burn. It is shown that PAC provides a significant improvement of the extinction performance, in particular when operating with liquid fuel spray injection.

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Section: Experimental Results For Different Fuelssupporting

confidence: 91%

Section: Experimental Results For Different Fuelssupporting

confidence: 69%

Section: Experimental Results For Different Fuelsmentioning

confidence: 99%