Effects of turbulent structure and local concentrations on soot formation and combustion in C2H2 diffusion flames

Magnussen, Bjørn F.; Hjertager, Bjørn Helge; Olsen, J G; Bhaduri, D.

doi:10.1016/s0082-0784(79)80130-7

Cited by 80 publications

(40 citation statements)

References 10 publications

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“…This mixing is primarily ensured by the turbulent structures (eddies) located in the flaming zone. In this case, the reaction rate can be written as a function of the local mass of fuel available for burning divided by the integral turbulent time scale (the Eddy Dissipation Combustion Concept) [14]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…where Y Fuel and Y Oxy denote the mass fraction of Fuel and Oxygen, respectively, ν is the stoichiometric ratio of the combustion reaction, and C A is a function of the turbulent Reynolds number [14]. where γ * is the volume fraction of the small scale turbulent structures and χ the fraction occupied by the reaction zone inside these small structures, defined as the following:…”

Section: Mathematical Modelmentioning

confidence: 99%

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Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

Morvan¹,

Lamorlette²

2014

Fire Saf. Sci.

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The aim of this paper is to investigate the role played by the size (thickness) of solid fuel particles upon both the heat transfer and the propagation of a surface fire through a homogeneous vegetation layer. Because all the interactions (mass, momentum, and heat transfer) between the solid fuel layer and the gas phase occur at the interface between these two media, the surface area to volume (SA/V) ratio (inversely proportional to the thickness of the solid fuel particles), which appears in the expression of the specific surface separating these two phases, must affect, more or less significantly, the fire dynamics. This problem has been studied numerically, using a multiphase formulation. Various variables, such as the temperature of the solid fuel, the temperature of the gas, the fire residence time and the heat flux by radiation and convection have been analyzed, in order to understand the role played by the SA/V upon the behaviour of the fire.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

Morvan¹,

Lamorlette²

2014

Fire Saf. Sci.

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“…Scalar measurements (temperatures and mass fractions) were conducted using a combination of spontaneous Raman scattering and Rayleigh scattering. using RANS simulations and compared three turbulence-chemistry modeling approaches, namely the eddy dissipation -ED -model (Magnussen and Hjertager, 1976), the eddy dissipation concept -EDC (Magnussen et al, 1978;Gran and Magnussen, 1996), and the steady laminar flamelets -SLF -model (Poinsot and Veynante, 2005;Peters, 2000;Fox, 2003). They used the commercial code FLUENT for the axisymmetric steady-state simulation, with an unstructured grid having about 30000 triangular cells (the domain size was not given).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Eight Finite-Rate Chemistry Kinetics for Co/H₂Combustion

Marzouk

Huckaby

2010

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:We compare the performance and computational cost of 8 kinetic models (3 global and 5 elementary) that describe the finite-rate chemistry of syngas combustion. We apply them in simulating a turbulent jet flame with syngas diluted by 30% nitrogen. We model the turbulence by a modified k-epsilon model and the turbulence-chemistry interaction by the partially stirred reactor approach. To integrate the chemistry equations, we nominally use explicit fifth-order embedded Runge-Kutta ODE solver. But semi-implicit Bulirsch-Stoer and implicit Euler were also used. The computational time depends on the number of reaction steps and the ODE solver. Five models overpredict the maximum flame temperature (by 200 K-320 K). Two models underpredict it by 240 K and 580 K. The global model that is based on the Westbrook-Dryer (1981) model for hydrocarbon fuels gives the best agreement with measurements, and also has low computational demand. Therefore, it is recommended for modeling turbulent syngas flames.

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“…The main parameters of the equations were obtained from their experimental results. [21][22][23][24][25][26][27][28][29][30][31] For the reactions rates of carbon combustion, solution loss and water gas reaction for both pulverized coal and charcoal, a comparative combustibility experiment was carried out with pulverized coal and pulverized charcoal used in this calculation in order to determine relative rate parameters used in these calculations. The model parameters and reactions rate constants are presented in Appendix B.…”

Section: Treatment Of the Charcoal Phase Interactions Andmentioning

confidence: 99%

A Six-phases 3-D Model to Study Simultaneous Injection of High Rates of Pulverized Coal and Charcoal into the Blast Furnace with Oxygen Enrichment

et al. 2011

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Simultaneous injection of charcoal and coal with oxygen enrichment in the blast furnace has recently received remarkable attention due to its possibility of considerable decrease in coke rate, increase in productivity and enhancement of combustion in the raceway. This paper deals with a modeling of simultaneous injection of pulverized coal and charcoal into the blast furnace through tuyeres. This model treats the blast furnace as a multi-phase reactor and six phases are considered simultaneously: gas, lump solids (raw iron ore, sinter, pellets and coke), hot metal, molten slag, pulverized charcoal and coal. Conservation equations for mass, momentum, energy and chemical species are solved simultaneously based on the finite volume method. Firstly two base cases of 200 kg/thm injection of pulverized coal and charcoal respectively are simulated and afterwards mixed injection of coal and charcoal are investigated. Simulation results for the two base cases are compared with measurements on industrial scale trials. Good agreement obtained for major operational parameters and inner temperatures verifies the model developed useful. Afterwards, the simultaneous injection operations are simulated in order to improve blast furnace performance. The simulation results contribute to better understanding of the blast furnace phenomena with combined injection and also to the development of new cleaner technologies to enhance the blast furnace operation.

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Effects of turbulent structure and local concentrations on soot formation and combustion in C2H2 diffusion flames

Cited by 80 publications

References 10 publications

Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

A Comparative Study of Eight Finite-Rate Chemistry Kinetics for Co/H₂Combustion

A Six-phases 3-D Model to Study Simultaneous Injection of High Rates of Pulverized Coal and Charcoal into the Blast Furnace with Oxygen Enrichment

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Effects of turbulent structure and local concentrations on soot formation and combustion in C2H2 diffusion flames

Cited by 80 publications

References 10 publications

Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

Impact of solid fuel particle size upon the propagation of a surface fire through a homogeneous vegetation layer

A Comparative Study of Eight Finite-Rate Chemistry Kinetics for Co/H2Combustion

A Six-phases 3-D Model to Study Simultaneous Injection of High Rates of Pulverized Coal and Charcoal into the Blast Furnace with Oxygen Enrichment

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A Comparative Study of Eight Finite-Rate Chemistry Kinetics for Co/H₂Combustion