Spark ignition of propane-air mixtures near the minimum ignition energy: Part I. An experimental study

Ko, Yeji; Anderson, Richard W.; Arpacı, Vedat S.

doi:10.1016/0010-2180(91)90204-o

Cited by 83 publications

(31 citation statements)

References 22 publications

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“…Previous experiments [10][11][12][13] have studied the evolution of the flame front for mixtures with Lewis numbers near unity. They showed that after the successful formation of a spherical flame front, the flame may propagate to a finite radius and extinguish.…”

Section: Introductionmentioning

confidence: 99%

Critical radius for sustained propagation of spark-ignited spherical flames

Kelley

Jomaas

Law

2009

Combustion and Flame

157

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Section: Introductionmentioning

confidence: 99%

Critical radius for sustained propagation of spark-ignited spherical flames

Kelley

Jomaas

Law

2009

Combustion and Flame

157

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“…In spite of several important applications of localised ignition of inhomogeneous mixtures, a relatively smaller effort has been directed to this area [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] in comparison to the vast body of literature on analytical [17][18][19][20][21][22], experimental [23][24][25][26][27][28][29][30][31][32] and computational [33][34][35][36][37][38] studies on localised ignition of homogenous mixtures. Ballal and Lefebvre [1][2][3] studied the critical spark energy, optimum spark duration and spark radius for successful ignition of inhomogeneous mixtures produced by evaporating droplets in turbulent air flow.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fuel Lewis Number on Localised Forced Ignition of Turbulent Mixing Layers

Chakraborty

Hesse

Mastorakos

2009

Flow Turbulence Combust

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The influences of fuel Lewis number Le F on localised forced ignition of inhomogeneous mixtures are analysed using three-dimensional compressible Direct Numerical Simulations (DNS) of turbulent mixing layers for Le F = 0.8, 1.0 and 1.2 and a range of different root-mean-square turbulent velocity fluctuation u values. For all Le F cases a tribrachial flame has been observed in case of successful ignition. However, the lean premixed branch tends to merge with the diffusion flame on the stoichiometric mixture fraction isosurface at later stages of the flame evolution. It has been observed that the maximum values of temperature and reaction rate increase with decreasing Le F during the period of external energy addition. Moreover, Le F is found to have a significant effect on the behaviours of mean temperature and fuel reaction rate magnitude conditional on mixture fraction values. It is also found that reaction rate and mixture fraction gradient magnitude |∇ξ | are negatively correlated at the most reactive region for all values of Le F explored. The probability of finding high values of |∇ξ | increases with increasing Le F . For a given value of u , the extent of burning decreases with increasing Le F . A moderate increase in u gives rise to an increase in the extent of burning for Le F = 0.8 and 1.0, which starts to decrease with further increases in u . For Le F = 1.2, the extent of burning decreases monotonically with increasing u . The extent of edge flame propagation on the stoichiometric mixture fraction ξ = ξ st isosurface is characterised by the probability of finding burned gas on this isosurface, which decreases with increasing u and Le F . It has been found that it is easier to obtain self-sustained combustion following localised forced ignition in case of inhomogeneous mixtures than that in the case 126 Flow Turbulence Combust (2010) 84:125-166 of homogeneous mixtures with the same energy input, energy deposition duration when the ignition centre is placed at the stoichiometric mixture. The difficultly to sustain combustion unaided by external energy addition in homogeneous mixture is particularly prevalent in the case of Le F = 1.2.

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“…Several authors have dealt with ignition studies either experimentally [4,8,9], theoretically using results from high activation energy asymptotic analysis [3][4][5][10][11][12] or numerically [13][14][15][16][17]. Most theoretical and numerical analyses were performed using a zero-dimensional energy balance or one-dimensional models [18] which are restricted to spherical geometries.…”

Section: Introductionmentioning

confidence: 99%

Effects of Turbulence on Self-sustained Combustion in Premixed Flame Kernels: A Direct Numerical Simulation (DNS) Study

Klein

Chakraborty

Cant

2008

Flow Turbulence Combust

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The effects of mean flame radius and turbulence on self-sustained combustion of turbulent premixed spherical flames in decaying turbulence have been investigated using three-dimensional direct numerical simulations (DNS) with single step Arrhenius chemistry. Several flame kernels with different initial radius or initial turbulent field have been studied for identical conditions of thermo-chemistry. It has been found that for very small kernel radius the mean displacement speed may become negative leading ultimately to extinction of the flame kernel. A mean negative displacement speed is shown to signify a physical situation where heat transfer from the kernel overcomes the heat release due to combustion. This mechanism is further enhanced by turbulent transport and, based on simulations with different initial turbulent velocity fields, it has been found that self-sustained combustion is adversely affected by higher turbulent velocity fluctuation magnitude and integral length scale. A scaling analysis is performed to estimate the critical radius for self-sustained combustion in premixed flame kernels in a turbulent environment. The scaling analysis is found to be in good agreement with the results of the simulations.

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Spark ignition of propane-air mixtures near the minimum ignition energy: Part I. An experimental study

Cited by 83 publications

References 22 publications

Critical radius for sustained propagation of spark-ignited spherical flames

Critical radius for sustained propagation of spark-ignited spherical flames

Effects of Fuel Lewis Number on Localised Forced Ignition of Turbulent Mixing Layers

Effects of Turbulence on Self-sustained Combustion in Premixed Flame Kernels: A Direct Numerical Simulation (DNS) Study

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