Prediction of soot and thermal radiation in a model gas turbine combustor burning kerosene fuel spray at different swirl levels

Ghose, Prakash; Patra, Jitendra; Datta, Amitava; Mukhopadhyay, Achintya

doi:10.1080/13647830.2016.1147607

Cited by 16 publications

(4 citation statements)

References 48 publications

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“…According to the previously reported studies, ,,, the realizable k – ε model is employed presently for modeling the turbulent flow within a model combustion chamber. The realizable k – ε model provides a sufficient compliance with the physics of turbulent flows.…”

Section: Numerical Methods Descriptionmentioning

confidence: 99%

Influence of Chemical Mechanisms on Spray Combustion Characteristics of Turbulent Flow in a Wall Jet Can Combustor

2017

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The objective of present paper is to assess the influence of different chemical mechanisms on nonpremixed combustion of kerosene liquid fuel in a gas turbine model combustor. Simulation of two-phase reacting flow is performed employing realizable k − ε turbulence, laminar flamelet combustion, and discrete ordinates radiation models in a structured finite volume grid. An Eulerian−Lagrangian approach is applied to model spray of liquid fuel. Distributions of mean axial velocity, temperature, scalar dissipation rate, mixture fraction, mass fraction, and rate of formation of carbon dioxide, water vapor, and nitrogen monoxide are compared for three different cases (three different chemical reaction mechanisms). Results depict that minimum deviations concerning the mean axial velocity and mean temperature are observed for case A, which consists of 17 species and 26 reaction steps. The maximum scalar dissipation rate is shown for case B, comprising 21 species and 30 reactions steps due to a higher mixture fraction variance. By enhancing the laminar scalar dissipation rate, mean temperature is reduced against mixture fraction. The reaction development and energy release rates are slower for case C, including 16 species and 26 reactions steps. The concentrations of predicted NO and CO 2 for the three cases are different due to the predicted temperature differences. The thermal NO formation rate is higher for case A, then C, and last of all B.

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Section: Numerical Methods Descriptionmentioning

confidence: 99%

Influence of Chemical Mechanisms on Spray Combustion Characteristics of Turbulent Flow in a Wall Jet Can Combustor

2017

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“…where µ t : the turbulent viscosity; σ k = 0.82; C 1 = 1.8; δ ij : the Kronecker delta; k: the turbulent kinetic energy; ε: the turbulent dissipation rate. Mutual radiation between particles during fuel combustion is an important mechanism for pulverized coal ignition, and the DO model has wider applicability and can calculate the radiative heat transfer process well [22]. For the medium with absorption, emission, and scattering properties, the radiative heat transfer equation at position → r and along the direction → s is:…”

Section: Numerical Modelingmentioning

confidence: 99%

Numerical Simulation Study of Hydrogen Blending Combustion in Swirl Pulverized Coal Burner

Lin,

Lei,

Wang

et al. 2024

Energies

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Hydrogen blending of pulverized coal in boilers is a promising technology. However, there are few studies on hydrogen blending in coal-fired boilers. In order to reduce CO2 emissions from coal-fired boilers, this study investigates the co-combustion of pulverized coal and hydrogen in a swirl pulverized coal burner by numerical simulation. Itis shown that the burnout rate of fuel is 5.08% higher than that of non-hydrogen blended coal when the percentage of hydrogen blended is 5%. The water vapor generated by hydrogen blending not only leads to the formation of a low-temperature zone near the burner outlet; it also results in a prolonged burnout time of moist pulverized coal and a high-temperature zone near the furnace outlet. The greater the amount of hydrogen for blending, the higher the water produced. When 1–3% hydrogen is blended, the water vapor in the furnace reacts with the carbon to produce a large amount of CO. When the amount of hydrogen added to the furnace is more than 3%, the water content in the furnace rises, resulting in a lower temperature at the burner outlet and a decrease in the amount of CO produced. When 1–3% hydrogen is blended, the CO2 emission rises. The CO2 emission decreased by 1.49% for 5% hydrogen blending compared to non-hydrogen blending and by 3.22% compared to 1% hydrogen blending.

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“…are injected through primary air hole. The spread parameter of 4.02 is used to calculate particle diameter distribution by following Rosin-Rammler distribution scheme [26]. The turbulent interaction in between gas and particle phase are simulated by employing Discrete random walk model [27].…”

Section: Discrete Phase Modelmentioning

confidence: 99%

No formation and its reduction through co-flow methane reburn in a pulverised coal combustion process under various overall equivalence ratio

Sahu

Ghose

2021

Journal of Thermal Engineering

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Computational simulation has been carried out to investigate the NO formation/depletion in pulverized coal combustion process. Newlands Bituminous coal is injected along with career air through a central hole of an axi-symmetric burner. A certain amount of co-flow methane is injected coaxially as reburn fuel. The effect of overall equivalence ratio on NO formation and NO reburn are mainly focused in this study. Species concentration for various species are also investigated, because both NO formation and depletion are related closely to various species concentration. From the study it is observed that, at overall equivalence ratio φ = 0.8 and 1.0, although the rate of Thermal-NO, Prompt-NO and Fuel-NO formation is high but due to narrow reaction zone and higher air velocity, a weak NO concentration field is observed. On the other hand, a higher NO concentration has been observed with higher equivalence ratio (ratio φ = 3.0, 6.0 and 9.0). It also has been observed, the maximum NO reduction efficiency at φ = 0.8, 1.0 and 3.0 is in between 1% to 7%, whereas for φ = 6.0 and 9.0, the maximum NO reduction efficiency is 27% and 34% respectively. Therefore, co-flow methane injection NO reduction method is more suitable for highly rich mixture conditions. Moreover, the percentage of coal burnout is also relatively higher for higher equivalence ratio condition.Cite this article as: Ajay K S, Prakash G. No formation and its reduction through co-flow methane reburn in a pulverised coal combustion process under various overall equivalence ratio.

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Prediction of soot and thermal radiation in a model gas turbine combustor burning kerosene fuel spray at different swirl levels

Cited by 16 publications

References 48 publications

Influence of Chemical Mechanisms on Spray Combustion Characteristics of Turbulent Flow in a Wall Jet Can Combustor

Influence of Chemical Mechanisms on Spray Combustion Characteristics of Turbulent Flow in a Wall Jet Can Combustor

Numerical Simulation Study of Hydrogen Blending Combustion in Swirl Pulverized Coal Burner

No formation and its reduction through co-flow methane reburn in a pulverised coal combustion process under various overall equivalence ratio

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