Turbulence and turbulent flame propagation—A critical appraisal

Andrews, GE; Bradley, D.; Lwakabamba, S.B.

doi:10.1016/0010-2180(75)90163-7

Cited by 229 publications

(35 citation statements)

References 76 publications

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“…This has been shown by the previously reported experimental measurements (3), further, the ratio of the turbulence intensity to the laminar flame speed, u' ..1 Su, is less than 1, placing these experiments in the wrinkled laminar fiame regime (4,5). According to the wrinkled laminar fiame model the turbulent fiame brush consists of a thin laminar reaction front which ftuctuates in shape and in location.…”

Section: Introductionsupporting

confidence: 74%

Density fluctuations in premixed turbulent flames

Namazian

Talbot

Robben

1985

Symposium (International) on Combustion

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The simultaneous two-point density fluctuations in a V-shaped turbulent flame are measured using a two-point Rayleigh scattering method. A wrinkle laminar flame model with .finite instantaneous flame thickness is developed for the flames studied. The reaction front probability density function is both measured directly and also calculated from the measured mean density. An analytical expression for this pdf is given which is derived based on a thin flame model. The mean, rms and correlation coefficients are calculated using the .finite reaction front thickness model and the results are compared with the experimental data. The pdf of the intermediate states are shown to be due to the reaction front thickness.

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Section: Introductionsupporting

confidence: 74%

Density fluctuations in premixed turbulent flames

Namazian

Talbot

Robben

1985

Symposium (International) on Combustion

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“…The flow quantities that were studied/visualized in the present work were the mean radial and tangential velocities and various turbulence parameters (turbulence intensity and length scale). These turbulence parameters were selected because various turbulent flame speed models/correlations and most qualitative descriptions of flame structure are based on them, [20] and [21]. The computational meshes of these pistons are shown in Figs.2and 3.…”

Section: Numerical Resultsmentioning

confidence: 99%

Numerical Flow Visualization Studies in Internal Combustion Engine

Anetor¹

2017

IJRET

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The KIVA-II code was used to simulate the effects of two different piston-bowl (re-entrant and bowl-in-piston) configurationsand two intake swirl levels (0.5 and 2.0) on the structure and evolution of the flow field at the top dead center position of an internal combustion engine. The results show that high-shear regions and the consequent turbulence production occurred near the bowl entrance around top dead center during the compression stroke. The regions were created before top dead center in both chambers by the interaction of swirl and squish. The mean radial and tangential velocities produced by the re-entrant bowl were found to be consistently higher than those generated by the bowl-in-piston configuration. It was found that the re-entrant bowl assembly generated 35% more turbulence than the bow-in-piston design while the squish penetration for low intake swirl (0.5) was about 20% greater than for high intake swirl (2.0). The results from this study shows that after top dead center, high shear and reverse-squish flow occurs in both combustion chambers, however, they were more intense in the re-entrant bowl assembly. In view of the foregoing, it is recommended that the re-entrant bowl assembly be considered as the preferred choice in combustion chamber design.

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“…The ratio of the rate of energy supply t~o that of viscous -dissipation occurrin~ at the mac~oseale level is, therefor~, The thickness of laminar gas-air flames has been the subjeyt of / extens i ve studies 17 and i t i s agreed that thi 5 2-The burned and unburned mixtures behave as perfect gases.…”

Section: R -'mentioning

confidence: 91%

Influence of Turbulence on Dust and Gas Explosions in Closed Vessels

1986

Dynamics of Explosions

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Turbulence and turbulent flame propagation—A critical appraisal

Cited by 229 publications

References 76 publications

Density fluctuations in premixed turbulent flames

Density fluctuations in premixed turbulent flames

Numerical Flow Visualization Studies in Internal Combustion Engine

Influence of Turbulence on Dust and Gas Explosions in Closed Vessels

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