Influence of gas expansion on the propagation of a premixed flame in a spatially periodic shear flow

Feng, Rilu; Gruber, Andrea; Chen, Jacqueline H.; Valiev, Damir

doi:10.1016/j.combustflame.2021.01.025

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…Numerical modelling was performed through a commercial computational fluid dynamics (CFD) code solving conservation of mass, conservation of momentum, conservation of energy equations, and species transport equations. The conservation of mass equation can be expressed as follows [ 17 ] :

\frac{\partial ρ}{\partial t} goodbreak+ \frac{\partial ((), ρu)}{\partial x} goodbreak+ \frac{\partial ((), ρv)}{\partial y} goodbreak+ \frac{\partial ((), ρw)}{\partial z} goodbreak= 0 .

…”

Section: Methodsmentioning

confidence: 99%

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Tasdemir,

Karyeyen

2023

Can J Chem Eng

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Fuels consisting of high hydrogen concentration can be consumed under colourless distributed combustion (CDC) to suppress flashback tendency in premixed conditions. Higher NOX challenges can also be overcome through CDC. For those purposes, coke oven gas was consumed under CDC within the scope of this study. To achieve CDC, or diluents were introduced into the oxidizer so that oxygen concentration in the oxidizer would be decreased from 21% O2 to its lean blow‐off limits. Excess air ratios were determined as λ = 1.2 and λ = 1.5 along with a thermal power of 10 kW under premixed conditions. A commercial computational fluid dynamics code was used to predict temperature distribution and , CO, and emissions. 162‐step reactions created with GRI‐Mech 3.0 chemical kinetics was integrated to the eddy dissipation concept combustion model. The temperature and profiles predicted were compared with the experimental results. Consistency was achieved at ~95% for temperature profiles, and almost 100% for profiles between the measured and the predicted ones. According to the results, it is concluded that a more homogeneous temperature distribution with the ~21% decrease in the maximum temperature was observed, and there was about 96% decrease in level. It was also demonstrated that using as a diluent is more effective in terms of temperature distribution over the combustor and reduction, while dilution with is more effective in terms about 70% in decrease on CO.

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\frac{\partial ρ}{\partial t} goodbreak+ \frac{\partial ((), ρu)}{\partial x} goodbreak+ \frac{\partial ((), ρv)}{\partial y} goodbreak+ \frac{\partial ((), ρw)}{\partial z} goodbreak= 0 .

…”

Section: Methodsmentioning

confidence: 99%

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Tasdemir,

Karyeyen

2023

Can J Chem Eng

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“…, which can be re-written, using (12), as 1 2 L F (K F,i K F,j ) + 2∇ ξ K F,i • ∇ ξ K F,j and then impose the solvability condition for the first term L F (K F,i K F,j ) = 0.…”

Section: Governing Equationsmentioning

confidence: 99%

“…In this paper, we study the problem of flame propagation in spatially or more generally spatio-temporally periodic flows having single length and time scales. A number of theoretical [1][2][3][4] and computational [5][6][7][8][9][10] investigations have been devoted to this problem in the past and more recently in [11,12]. Experimental studies have also addressed this problem, notably in order to gain insight into flame propagation in the presence of Taylor-Couette vortices [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effective Lewis number and burning speed for flames propagating in small-scale spatio-temporal periodic flows

Rajamanickam,

Daou

2023

Combustion and Flame

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“…The thermal gas expansion has recently been shown to be of fundamental importance to flame flashback [2,24,32]. In the vicinity of the wall, the thermal expansion of gas at the flame front influences the interaction between the flame and flow, promoting upstream flame propagation.…”

Section: Introductionmentioning

confidence: 99%

Combined Impact of the Lewis Number and Thermal Expansion on Laminar Flame Flashback in Tubes

Huang,

Benteux,

Han

et al. 2024

Fluids

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The understanding of the boundary layer flame flashback (BLF) has considerably improved in recent decades, driven by the increasing focus on clean energy and the need to address the operational issues associated with flashback. This study investigates the influence of the Lewis number (Le) on symmetric flame shapes under the critical conditions for a laminar boundary layer flashback in cylindrical tubes. It has been found that the transformation of the flame shape from a mushroom to a tulip happens in a tube of a given radius, as the thermal expansion coefficient and Le are modified. A smaller Lewis number results in a local increase in the burning rate at the flame tip, with the flame being able to propagate closer to the wall, which significantly increases the flashback propensity, in line with previous findings. In cases with a Lewis number smaller than unity, a higher thermal expansion results in a flame propagation happening closer to the wall, thus facing a weaker oncoming flow and, consequently, becoming more prone to flashback. For Le > 1, the effect of the increase in the thermal expansion coefficient on the flashback tendency is much less pronounced.

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Influence of gas expansion on the propagation of a premixed flame in a spatially periodic shear flow

Cited by 7 publications

References 23 publications

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Effective Lewis number and burning speed for flames propagating in small-scale spatio-temporal periodic flows

Combined Impact of the Lewis Number and Thermal Expansion on Laminar Flame Flashback in Tubes

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