Flame structure and emission signature in distributed combustion

Roy, Rishi; Gupta, Ashwani K.

doi:10.1016/j.fuel.2019.116460

Cited by 27 publications

(7 citation statements)

References 49 publications

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“…The mean value of CH 2 O in Flame 7 is larger than that of Flame 6, but that of OH is smaller. The wrinkled front enhanced the preheat reaction, but the larger heat capacity of CO 2 makes the flame temperature lower and the reaction rate slower, which is consistent with the result of Roy [39]. At the Reynolds number of 6000, there is no difference in the mean value of CH 2 O between Flames 4 and 5, but the OH value was weakened and the combustion was delayed in Flame 5, indicating less heat release and weakened reaction in flame zone.…”

Section: Analysis Of Plif Imagessupporting

confidence: 82%

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

et al. 2020

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Diluting the combustion mixtures is one of the advanced approaches to reduce the NOx emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NOx. The effect of N2/CO2 dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH2O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH2O, and postpone the burning of fuel. Compared with the ultra-lean combustion, the dilution weakens the combustion more obviously. For different dilution gases, the concentration of OH in the combustion zone varies greatly, while the concentration of CH2O in the unburned zone is less affected by different dilution gas. The CO2 dilution has a more significant effect on OH concentration than N2 with the given dilution ratio, but a similar effect on the concentration of CH2O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.

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Section: Analysis Of Plif Imagessupporting

confidence: 82%

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

et al. 2020

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“…The result is a slight increase in hydrogen and NO X emissions, and they noted a significant reduction in CO emissions. Roy and Gupta [ 17 ] investigated the impact of the distributed combustion on the flame structure and pollutant emissions. In this study, they used methane, propane, and 20% and 40% hydrogen‐enriched methane as fuel.…”

Section: Introductionmentioning

confidence: 99%

Entrainment effects on combustion and emission characteristics of turbulent non‐premixed ammonia/air and methane/air swirl flames through a developed perforated burner

Sahin,

Ilbas,

Arslan

2023

Can J Chem Eng

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A fuel/oxidizer mixture can be burned using a colourless distributed combustion (CDC) process to obtain low emissions and homogeneous combustion. As an alternative way, a perforated burner can be designed to achieve homogeneous combustion and low emissions without changing the combustion performance by having entrainment effects on the combustion chamber. In this study, computational fluid dynamics (CFD) 3D modelling was performed in a perforated burner for ammonia/methane fuels in order to obtain the distributed regime and focus on the entrainment effects. In numerical analysis, the eddy break‐up was used as combustion model, k‐Ɛ as turbulence model, and P‐1 as radiation model. In this study, 10% and 20% entrainment rates were provided from the flame holder wall of the perforated burner. The effects of entrainment rates on temperature, velocity, and NOX emission values were examined. According to the results, when the entrainment rate was increased from 10% to 20%, the overall temperature values of ammonia and methane combustion slightly increased by approximately 1.0%, while on the other hand the maximum temperature levels in the near burner zone decreased by about 5.0%. The findings demonstrated that temperature and velocity distributions got more uniform and the flame zones became thinner. This provided a more colourless and invisible flame appearance. In this way, an improvement in the thermal field has been achieved. In conclusion, when the effect of the distributed regime on NOX emission levels was examined, it has been noted that entrainment effects enable the achievement of low emission levels (approximately 9.0%).

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“…The possibilities to advance FC in gas turbines is systematically reviewed recently [18,19]. Gupta's group conducted a series of experimental studies regarding the flame structure and pollutant emission of distributed flame, testifying the decline of heat release induced instability and significant reduction of NO formation [20,21,22,23,24,25]. Large Eddy Simulation (LES) has been widely used as an reliable diagnostic tool to investigate turbulent reactive flows and enables detailed views into the oxidation process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Distributed Combustion of Reformed Methanol Blends in a Model Gas Turbine Combustor

Shen¹,

Zhang²,

Zhang³

et al. 2022

SSRN Journal

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Flame structure and emission signature in distributed combustion

Cited by 27 publications

References 49 publications

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

Entrainment effects on combustion and emission characteristics of turbulent non‐premixed ammonia/air and methane/air swirl flames through a developed perforated burner

Characterization of Distributed Combustion of Reformed Methanol Blends in a Model Gas Turbine Combustor

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