Burning velocities, markstein lengths, and flame quenching for spherical methane-air flames: A computational study

Bradley, D.; Gaskell, Philip; Gu, Xiaolei

doi:10.1016/0010-2180(95)00115-8

Cited by 545 publications

(230 citation statements)

References 23 publications

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“…[12]. This approach was used in [13,14], but the onset of Darrieus-Landau and thermodiffusive instabilities at lower stretch rates destroys the linear relationship.…”

Section: Introductionmentioning

confidence: 99%

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Explosion bomb measurements of ethanol–air laminar gaseous flame characteristics at pressures up to 1.4MPa

Bradley

Lawes

Mansour

2009

Combustion and Flame

182

102

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The principal burning characteristics of a laminar flame comprise the fuel vapour pressure the laminar burning velocity, ignition delay times, Markstein numbers for strain rate and curvature, the stretch rates for the onset of flame instabilities and of flame extinction for different mixtures. With the exception of ignition delay times, measurements of these are reported and discussed for ethanol-air mixtures. The measurements were in a spherical explosion bomb, with central ignition, in the regime of a developed stable, flame between that of an under or over-driven ignition and that of an unstable flame. Pressures ranged from 0.1 to 1.4 MPa, temperatures from 300 to 393K, and equivalence ratios were between 0.7 and 1. 3

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“…[12]. This approach was used in [13,14], but the onset of Darrieus-Landau and thermodiffusive instabilities at lower stretch rates destroys the linear relationship.…”

Section: Introductionmentioning

confidence: 99%

“…In reality,  is the sum of the aerodynamic flame strain rate, s  , and the stretch due to flame curvature, c  , the expressions for which are given in [12]. [12].…”

Section: Introductionmentioning

confidence: 99%

Explosion bomb measurements of ethanol–air laminar gaseous flame characteristics at pressures up to 1.4MPa

Bradley

Lawes

Mansour

2009

Combustion and Flame

182

102

View full text Add to dashboard Cite

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“…velocities were examined (u' = 2 m/s and 6 m/s). Included below is a brief description of the experimental equipment and procedure; more detail is available in references [7][8][9]. All experiments incorporated schlieren-based imaging and pressure measurements to enable comparison of burn rate trends at both early and later stages of flame development.…”

Section: Experimental and Results Processingmentioning

confidence: 99%

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Burluka

Gaughan

Griffiths

et al. 2016

Fuel

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“…There are various methods found in the literature for relating stretch rate and stretched flame speeds such that the fundamental mixture parameters, the unstretched laminar burning velocity, s u o , and Markstein length, L u , can be extracted as described in Refs. [27,[31][32][33][34]. The present study uses a commonly employed relation, first postulated by Markstein [31]: …”

Section: Effect Of Cylindrical Confinement On Laminar Flame Speed Meamentioning

confidence: 99%

Reduced and Validated Kinetic Mechanisms for Hydrogen-CO-sir Combustion in Gas Turbines

Ju¹,

Dryer²

2009

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Rigorous experimental, theoretical, and numerical investigation of various issues relevant to the development of reduced, validated kinetic mechanisms for synthetic gas combustion in gas turbines was carried out -including the construction of new radiation models for combusting flows, improvement of flame speed measurement techniques, measurements and chemical kinetic analysis of H 2 /CO/CO 2 /O 2 /diluent mixtures, revision of the H 2 /O 2 kinetic model to improve flame speed prediction capabilities, and development of a multi-time scale algorithm to improve computational efficiency in reacting flow simulations. Executive SummaryRigorous experimental, theoretical, and numerical investigation of various issues relevant to the development of reduced, validated kinetic mechanisms for synthetic gas combustion in gas turbines was carried out -including the construction of new radiation models for combusting flows, improvement of flame speed measurement techniques, measurements and chemical kinetic analysis of H 2 /CO/CO 2 /O 2 /diluent mixtures, revision of the H 2 /O 2 kinetic model to improve flame speed prediction capabilities, and development of a multi-time scale algorithm to improve computational efficiency in reacting flow simulations.An accurate spectral dependent radiation model is developed to predict flame speed and flammability of H 2 /CO/CO 2 /H 2 O/Air mixtures. The results showed that radiation reabsorption significantly extended the flammability limits. It was also demonstrated that accurate prediction of coal syngas flammability is not possible without appropriate consideration of radiation absorption by CO 2 and H 2 O.Methodologies to improve flame speed measurement were developed by experimental and theoretical investigation of the effect of non-spherical (i.e. cylindrical) bomb geometry on the evolution of outwardly propagating flames and the determination of laminar flame speeds. The cylindrical chamber boundary modifies the propagation rate through the interaction of the wall with the flow induced by thermal expansion across the flame (even with constant pressure), which leads to significant distortion of the flame surface for large flame radii. It was determined that these departures from the unconfined case, especially the resulting non-zero burned gas velocities, can lead to significant errors in flame speeds calculated using the conventional assumptions, especially for large flame sizes.The methodology to estimate the effect of nonzero burned gas velocities is applied to correct the flame speed for non-zero burned gas speeds, in order to extend the range of flame radii useful for flame speed measurements. Under the proposed scaling, the burned gas speed can be well approximated as a function of only flame radius for a given chamber geometry -i.e. the correction function need only be determined once for an apparatus and then it can be used for any mixture. Results indicate that the flow correction can be used to extract flame speeds for flame radii up to 0.5 times the wall radius wi...

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Burning velocities, markstein lengths, and flame quenching for spherical methane-air flames: A computational study

Cited by 545 publications

References 23 publications

Explosion bomb measurements of ethanol–air laminar gaseous flame characteristics at pressures up to 1.4MPa

Explosion bomb measurements of ethanol–air laminar gaseous flame characteristics at pressures up to 1.4MPa

Turbulent burning rates of gasoline components, Part 1 – Effect of fuel structure of C6 hydrocarbons

Reduced and Validated Kinetic Mechanisms for Hydrogen-CO-sir Combustion in Gas Turbines

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