Correlation of turbulent burning velocities of ethanol–air, measured in a fan-stirred bomb up to 1.2MPa

Bradley, D.; Lawes, M.; Mansour, Morkous S.

doi:10.1016/j.combustflame.2010.08.001

Cited by 126 publications

(74 citation statements)

References 58 publications

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“…The mass burned, m u , is deduced from the flame front geometry. This must be compatible with that deduced from the measured In its early stages the flame is only wrinkled by the smaller wavelengths of the turbulent spectrum, with an effective rms at the flame front of k u [3], with u u k   found from integration of the turbulent power spectral density function between the limiting wave numbers [7]. Rapid compression of unburned gas decreases the length scale below the initial value and conservation of angular momentum increases k u [8].…”

Section: Experimental Methodssupporting

confidence: 55%

“…Allowances were made for these, as well as the small effect of the changes in l and u , on values of K [3].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The second aim is to study the regime of K < 0.1, in which there is strong evidence of coupling between turbulence and laminar flame instabilities, giving increased values of U [5,6]. The fuels in [2] and [3] were ethanol and propane and in the present study, hydrogen, methane, toluene and i-octane, up to a maximum pressure of 3.5 MPa and 480K.…”

mentioning

confidence: 99%

“…Over a wide range of conditions the ratio of t u , to the effective rms turbulent velocity, k u , that allows for the development of the flame kernel, can be expressed in terms of the Karlovitz stretch factor, K, by [2,3]:…”

mentioning

confidence: 99%

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Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures

Bradley

Lawes

Liu

et al. 2013

Proceedings of the Combustion Institute

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Section: Experimental Methodssupporting

confidence: 55%

“…Allowances were made for these, as well as the small effect of the changes in l and u , on values of K [3].…”

Section: Experimental Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures

Bradley

Lawes

Liu

et al. 2013

Proceedings of the Combustion Institute

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“…Latterly, it has proved necessary to separate K and Ma sr [17][18][19]. This was particularly so in the low K regime of unstable flamelets, in which flame wrinkling due to laminar flame instabilities interacts with the onset of very mild turbulence at low values of the rms turbulent velocity, .…”

Section: Probability Of Burning and The Turbulent Burning Velocitymentioning

confidence: 99%

Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Bagdanavičius

Bowen

Bradley

et al. 2015

Combustion and Flame

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Key wordsTurbulent premixed flame, burning velocity, flame stretch rate, flame surface density, Markstein number. AbstractIndependent research at two centres using a burner and an explosion bomb has revealed important aspects of turbulent premixed flame structure. Measurements at pressures and temperatures up to 1.25 MPa and 673 K in the two rigs were aimed at quantifying the influences of flame stretch rate and strain rate Markstein number, Ma sr , on both turbulent burning velocity and flame surface density. That on burning velocity is expressed through the stretch rate factor, I o , or probability of burning, P b 0.5 . These depend on Ma sr , but they grow in importance as the Karlovitz stretch factor, K, increases, and are evaluated from the associated burning velocity data. Planar laser tomography was employed to identify contours of reaction progress variable in both rigs. These enabled both an appropriate flame front for the measurement of the turbulent burning velocity to be identified, and flame surface densities, with the associated factors, to be evaluated. In the explosion measurements, these parameters were derived also from the flame surface area, the derived P b 0.5 factor and the measured turbulent burning velocities. In the burner measurement they were calculated directly from the flame surface density, which was derived from the flame contours.A new overall correlation is derived for the P b 0.5 factor, in terms of Ma sr at different K and this is discussed in the light of previous theoretical studies. The wrinkled flame surface area normalised by the area associated with the turbulent burning velocity measurement, and the ratio of turbulent to laminar burning velocity, u t /u l , are also evaluated. The higher the value of , the more effective is an increased flame wrinkling in increasing u t /u l . A correlation of the product of k and the laminar flame thickness with Karlovitz stretch factor and Markstein number is explored using the present data and those of other workers. Some generality is revealed, enabling the wave length associated with the spatial change in mean reaction progress variable to be expressed by the number of laminar flame thicknesses, and the flame volume to be found.

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Regimes of Premixed Flames

Liberman

2021

Combustion Physics

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Correlation of turbulent burning velocities of ethanol–air, measured in a fan-stirred bomb up to 1.2MPa

Cited by 126 publications

References 58 publications

Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures

Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures

Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Regimes of Premixed Flames

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