Development of distributed combustion index from a swirl-assisted burner

Karyeyen, Serhat; Feser, Joseph S.; Jahoda, Edward; Gupta, Ashwani K.

doi:10.1016/j.apenergy.2020.114967

Cited by 23 publications

(5 citation statements)

References 17 publications

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“…It may be noticed that all these frequencies are integer multiples of the base frequency of 67. fluctuating OH field can be noticed along with the (yellow-colored) instantaneous vortical structures. The iso-surface value of 8x10 -4 is chosen for the reconstructed fluctuating OH field, whereas the iso-surface of Q-criterion (at a value equal to 1x10 8 ) is used to show the vortices of the instantaneous field. (The iso-surface of fluctuating OH field at 6x10 -4 was found to be less suitable for visualization of the OH structures along with vortices).…”

Section: Proper Orthogonal Decomposition Resultsmentioning

confidence: 99%

“…To improve the traditional combustion mode, researchers have considered an alternative mode referred to as "flameless combustion," which has several variants radically different from the traditional combustion of pure air and fuel at room temperature [1][2][3] . The heating of both fuel and oxidizer before combustion in High-temperature Combustion Technology (HiCOT), preheating of air only in High-Temperature Air Combustion (HiTAC) 4 , varying the oxygen content in air through dilution in Moderate or Intense Low Dilution (MILD) 5 or Colorless Distributed Combustion (CDC) [6][7][8][9][10][11][12][13] are few examples of these new combustion systems. _____________________________ a) Electronic mail: ashoke@iitk.ac.in.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Bhatia

Roekaerts

et al. 2022

Physics of Fluids

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The present work focuses on the large eddy simulation (LES) and the study of turbulent dilute methanol spray flames in vitiated coflow using the secondary-oxidizer Flamelet Generated Model (FGM). The modified FGM model uses an additional secondary oxidizer parameter in addition to the three other parameters previously used for spray flames - progress variable, mixture fraction, and enthalpy. The results for gas phase and droplet properties are validated against the dilute methanol spray flame database for varying fuel injection amounts. The droplet statistics and the lift-off flame heights are accurately captured for all the cases. A proper orthogonal decomposition (POD) of the scalar fluctuating hydroxyl radical (OH) field and velocity-temperature field capture the flame structures in the downstream region of ignition kernels. The detailed POD analysis reveals that the base frequency of the dominant OH field equals that of the dominant vortical structure of 67.3 Hz. The flame propagation happens around these dominant vortical structures because of the less-strained fluid mixing.

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Section: Proper Orthogonal Decomposition Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Bhatia

Roekaerts

et al. 2022

Physics of Fluids

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“…Nevertheless, further reduction is possible with inert gas dilution [22], since the adiabatic flame temperature will also decrease.…”

Section: Pollutant Emissionsmentioning

confidence: 99%

Mixture temperature-controlled combustion: A revolutionary concept for ultra-low NOX emission

Józsa

2021

Fuel

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“…[1,2] Addressing emissions within the boundaries set by the Copenhagen/Kyoto Protocol necessitates the development of combustion systems capable of simultaneously delivering efficiency and pollutant reduction. [3,4] Consequently, researchers have directed their attention to the following areas of study: 1) replacing traditional fossil fuels with clean energy; 2) promoting the implementation of new combustion technologies; and 3) the above two methods are organically combined. Of these, the last way is the most attractive.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

Zhang,

Liu,

Huang

et al. 2023

Energy Tech

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In this article, the effects of hydrogenation amount (0–80%), oxygen content (14–18%), and strain rate (10–1000 s−1) on the emission characteristics of NO and CO in moderate or intense low‐oxygen dilution (MILD) fractional combustion are studied under the actual working conditions of gas turbine (T = 723 K, P = 16.5 atm). The pathway of NO and CO production and the reaction with the greatest influence on their emissions are analyzed. In the findings, it is indicated that NO emissions are suppressed at lower hydrogen levels, while the addition of hydrogen leads to a decrease in CO emissions. Specifically, the key reaction for NO formation is H + NO + M = HNO + M, whereas CO emissions are primarily controlled by the direct reaction OH + CO = H + CO2. Furthermore, the reduction of oxygen levels effectively suppresses NO and CO emissions during MILD combustion. The variation in oxygen level exerts the greatest influence on the reaction rate of the NNH pathway. High concentrations of O2 are identified as the primary cause of elevated CO levels in MILD combustion. Finally, elevating the strain rate in MILD combustion demonstrates a mitigating effect on NO and CO emissions.

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Development of distributed combustion index from a swirl-assisted burner

Cited by 23 publications

References 17 publications

Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Mixture temperature-controlled combustion: A revolutionary concept for ultra-low NOX emission

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

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Development of distributed combustion index from a swirl-assisted burner

Cited by 23 publications

References 17 publications

Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model

Mixture temperature-controlled combustion: A revolutionary concept for ultra-low NOX emission

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH4/H2 in Staged MILD Combustion

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Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion