Simulations of laminar flame propagation in droplet mists

Neophytou, A.; Mastorakos, Epaminondas

doi:10.1016/j.combustflame.2009.02.014

Cited by 87 publications

(102 citation statements)

References 18 publications

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“…This is in contrast to simulations that use point droplets, such as all [22] and Neophytou and Mastorakos (2009) [23], or in the 2D analysis by Reveillon and Vervisch (2005) [24]. By contrast, the present DNS fully resolves the droplets as in the numerical approach by Kikuchi et al (2005) [25]; here, we additionally allow the droplets to be moved by the gas expansion.…”

Section: Introductionmentioning

confidence: 49%

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Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Nicoli

Denet

Haldenwang

2015

Combustion and Flame

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Section: Introductionmentioning

confidence: 49%

“…The previous comments on Figs. 5-7 invite us to stress on the following features, that have already been observed in numerous experimental and numerical studies [11,12,20,21,23,34] :…”

Section: Role Of the Lattice Spacingmentioning

confidence: 99%

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Nicoli

Denet

Haldenwang

2015

Combustion and Flame

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“…In the case of gaseous propagating flames, a key quantity is the laminar burning velocity S L . In order to account for the presence of droplets, Ballal and Lefebvre [37] proposed an expression for a two-phase laminar burning speed S t−p l , that has been validated numerically in [38]:…”

Section: Diameter Selectionmentioning

confidence: 99%

Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

Lancien

Prieur

Durox

et al. 2017

Volume 4A: Combustion, Fuels and Emissions

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The light-round is defined as the process by which the flame initiated by an ignition spark propagates from burner to burner in an annular combustor, eventually leading to a stable combustion. Combining experiments and numerical simulation, it was recently demonstrated that under perfectly premixed conditions this process could be suitably described by large eddy simulation (LES) using massively parallel computations. The present investigation aims at developing light-round simulations in a configuration that is closer to that found in aero-engines by considering liquid nheptane injection. The large-eddy simulation of the ignition sequence of a laboratory scale annular combustion chamber comprising sixteen swirled spray injectors is carried out with a mono-disperse Eulerian approach for the description of the liquid phase. The objective is to assess this modeling approach of the two-phase reactive flow during the ignition process. The simulation results are compared in terms of flame structure and light-round duration to the corresponding experimental images of the flame front recorded by a high-speed intensified CCD camera and to the corresponding experimental delays. The dynamics of the flow is also analyzed to identify and characterize mechanisms controlling flame propagation during the light-round process.

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“…Neophytou and Mastorakos [14] numerically analysed the effects of volatility, droplet diameter and droplet equivalence ratio on burning velocity in one-dimensional flames where fuel is supplied in the form of mono-disperse droplets based on detailed chemistry n-heptane and n-decane laminar flame simulations. Two-dimensional unsteady laminar counter-flow simulations have also been used by Nakamura et al [15] and Watanabe et al [16,17] to analyse the effects of equivalence ratio, droplet diameter and droplet group number on n-decane spray flame structure.…”

Section: Introductionmentioning

confidence: 99%

Flame Structure and Propagation in Turbulent Flame-Droplet Interaction: A Direct Numerical Simulation Analysis

Wacks

Chakraborty

2016

Flow Turbulence Combust

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Three-dimensional Direct Numerical Simulations (DNS) in canonical configuration have been employed to study the combustion of mono-disperse droplet-mist under turbulent flow conditions. A parametric study has been performed for a range of values of droplet equivalence ratio φ d , droplet diameter a d and root-mean-square value of turbulent velocity u . The fuel is supplied entirely in liquid phase such that the evaporation of the droplets gives rise to gaseous fuel which then facilitates flame propagation into the dropletmist. The combustion process in gaseous phase takes place predominantly in fuel-lean mode even for φ d > 1. The probability of finding fuel-lean mixture increases with increasing initial droplet diameter because of slower evaporation of larger droplets. The chemical reaction is found to take place under both premixed and non-premixed modes of combustion: the premixed mode ocurring mainly under fuel-lean conditions and the non-premixed mode under stoichiometric or fuel-rich conditions. The prevalence of premixed combustion was seen to decrease with increasing droplet size. Furthermore, droplet-fuelled turbulent flames have been found to be thicker than the corresponding turbulent stoichiometric premixed flames and this thickening increases with increasing droplet diameter. The flame thickening in droplet cases has been explained in terms of normal strain rate induced by fluid motion and due to flame normal propagation arising from different components of displacement speed. The statistical behaviours of the effective normal strain rate and flame stretching have been analysed in detail and detailed physical explanations have been provided for the observed behaviour. It has been found that the droplet cases show higher probability of finding positive effective normal strain rate (i.e. combined contribution of fluid motion and flame propagation), and negative values of stretch rate than in the stoichiometric premixed flame under similar flow conditions, which are responsible for higher flame thickness and smaller flame area generation in droplet cases.

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Simulations of laminar flame propagation in droplet mists

Cited by 87 publications

References 18 publications

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

Flame Structure and Propagation in Turbulent Flame-Droplet Interaction: A Direct Numerical Simulation Analysis

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Simulations of laminar flame propagation in droplet mists

Cited by 87 publications

References 18 publications

Rich spray-flame propagating through a 2D­Lattice of alkane droplets in air

Rich spray-flame propagating through a 2D­Lattice of alkane droplets in air

Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

Flame Structure and Propagation in Turbulent Flame-Droplet Interaction: A Direct Numerical Simulation Analysis

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Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Rich spray-flame propagating through a 2DLattice of alkane droplets in air