Effect of air flow distribution on soot formation and radiative heat transfer in a model liquid fuel spray combustor firing kerosene

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

doi:10.1016/j.ijheatmasstransfer.2014.03.001

Cited by 26 publications

(8 citation statements)

References 36 publications

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“…The equations in RANS can be written as follows: where is the Reynolds stresses, related to the mean velocity gradients based on the Boussinesq hypothesis, which is given by where μ t is the turbulent viscosity, given as where k is the turbulence kinetic energy and ε is the turbulence dissipation rate.…”

Section: Numerical Modelsmentioning

confidence: 99%

Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

et al. 2017

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The interaction between the coaxial air microjet structure and the swirling flow is investigated numerically based on the nonpremixed bluff-body stabilized swirling SM1 flame. The effects of microjet velocity and swirl number on flame combustion characteristics are analyzed. The modified standard k–ε model and the realizable k–ε model are considered for the turbulent model using FLUENT software. The flamelet model is used with the GRI 2.11 detailed kinetic mechanism. In addition, the discrete ordinate model and the weighted-sum-of-gray-gases model are used together to deal with the radiative heat transfer in the combustion process. Results of the modified standard k–ε model are in better agreement with the experimental data than the realizable k–ε model. Results show that the inner flame generates due to the existence of a microjet configuration. High microjet velocity (such as 50 m/s) can reduce the soot formation and keep the inner flame high temperature region away from the microjet nozzle. The structure of the inner flame depends on the microjet velocity and is independent of the swirl number. Swirl number increases from 0.3 to 0.6, the primary peak temperature is enhanced by 48 K, and the peak soot volume fraction is increased by 49% along the axis centerline.

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Section: Numerical Modelsmentioning

confidence: 99%

Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

et al. 2017

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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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“…Engine studies have often employed the RNG kmodel (e.g. [139,[164][165][166]), while gas turbine studies have used the RNG k- [167] or the realisable kmodel [168]. The turbulent transport of scalars has also received considerable attention in the combustion literature (see e.g.…”

Section: Overview Of the Closure Problem For Soot In Turbulent Flowsmentioning

confidence: 99%

Modelling of Soot Aerosol Dynamics in Turbulent Flow

Rigopoulos

2019

Flow Turbulence Combust

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Aerosol dynamics plays an important role in the modelling of soot formation in combustion processes, as it is responsible for predicting the distribution of size and shape of soot particles. The distribution is required for the correct prediction of the rates of surface processes, such as growth and oxidation, and furthermore it is important on its own because new regulations on particulate emissions require control of the number of smaller particles. Soot formation is strongly dependent on the local chemical composition and thermodynamic conditions and is therefore coupled with fluid dynamics, chemical kinetics and transport phenomena. Comprehensive modelling of soot formation in combustion processes requires coupling of the population balance equation, which is the fundamental equation governing aerosol dynamics, with the equations of fluid dynamics. The presence of turbulence poses an additional challenge, due to the non-linear interactions between fluctuating velocity, temperature, concentrations and soot properties. The purpose of this work is to review the progress made in aerosol dynamics models, their integration with fluid dynamics and the models for addressing the turbulence-soot interaction.

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Effect of air flow distribution on soot formation and radiative heat transfer in a model liquid fuel spray combustor firing kerosene

Cited by 26 publications

References 36 publications

Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

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

Modelling of Soot Aerosol Dynamics in Turbulent Flow

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