Spherical flame initiation and propagation with thermally sensitive intermediate kinetics

Zhang, Huangwei; Chen, Zheng

doi:10.1016/j.combustflame.2010.12.031

Cited by 45 publications

(20 citation statements)

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“…Theory [31,[68][69][70][71], simulation [29,31,72], and experiments [31,45] all shows that OPF is affected by ignition energy when the flame radius is small. Based on their simulation of stoichiometric CH 4 /air flames, Bradley et al [29] suggested that R fL = 6 mm is appropriate to eliminate the ignition effect.…”

Section: Ignitionmentioning

confidence: 93%

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

Chen

2015

Combustion and Flame

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225

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Section: Ignitionmentioning

confidence: 93%

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

Chen

2015

Combustion and Flame

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225

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“…In the new coordinate (τ = t, ξ = r − R(t)), the flame can be considered as in a quasi-steady state (∂/∂τ = 0). This quasi-steady assumption has been widely used in previous studies [15][16][17][20][21][22][23] and validated by transient numerical simulation [16]. As a result, the governing equations are simplified to…”

Section: Mathematical Modelmentioning

confidence: 97%

Asymptotic analysis of outwardly propagating spherical flames

Chen

2012

Acta Mech Sin

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Asymptotic analysis is conducted for outwardly propagating spherical flames with large activation energy. The spherical flame structure consists of the preheat zone, reaction zone, and equilibrium zone. Analytical solutions are separately obtained in these three zones and then asymptotically matched. In the asymptotic analysis, we derive a correlation describing the spherical flame temperature and propagation speed changing with the flame radius. This correlation is compared with previous results derived in the limit of infinite value of activation energy. Based on this correlation, the properties of spherical flame propagation are investigated and the effects of Lewis number on spherical flame propagation speed and extinction stretch rate are assessed. Moreover, the accuracy and performance of different models used in the spherical flame method are examined. It is found that in order to get accurate laminar flame speed and Markstein length, non-linear models should be used.

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“…We study spherical flame initiation and propagation in the coordinate attached to the moving flame front, R = R(t). In this coordinate, n = r À R(t), the flame can be considered as in a quasi-steady state (the validation of this quasi-steady assumption has been demonstrated by transient numerical simulation [6,8,9]) and thereby the non-dimensional governing equations become…”

Section: Mathematical Modelmentioning

confidence: 99%

“…the Lewis number effect) [1,2]. Therefore, critical ignition condition strongly depends on the Lewis number of the deficient reactant [3][4][5][6][7][8][9]. Specifically, due to the high positive stretch rate of the ignition kernel, the minimum ignition energy and critical ignition radius increase significantly with the Lewis number [6][7][8][9].…”

Section: Introductionmentioning

confidence: 96%