The premixed flame in a counterflow

Buckmaster, J.; Mikolaitis, David W.

doi:10.1016/0010-2180(82)90100-6

Cited by 62 publications

(9 citation statements)

References 4 publications

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“…Since the propagation direction of the weak flame is now in the same general direction as that of the bulk convective motion of the strong mixture, the laminar propagation spccd or the weak flame should then assume a negativc value according to the conventional definition of the sign of the flame speed. The existence of negative flame speeds has been theoretically predicted (Libby and Williams, 1981;Buckmaster and Mikolaitis, 1982) for a single counterflow prcmixcd flamc, and has hccn cxpcrimcntally established in the double flame configuration (Sohrab el a/., 1983, 19x4). Thc present analysis further substantiates this negative flamc spccd phcnomcnon.…”

Section: Ill T W O L E a N P R E M I X E D F L A M E Smentioning

confidence: 97%

Theory of Interactive Combustion of Counterflow Premixed Flames

Sohrab

Law

1986

Combustion Science and Technology

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Section: Ill T W O L E a N P R E M I X E D F L A M E Smentioning

confidence: 97%

Theory of Interactive Combustion of Counterflow Premixed Flames

Sohrab

Law

1986

Combustion Science and Technology

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“…In a series of papers by Libby and Williams (1982,1983,1984,1987 and Libby, Lifian, Williams (1983) high activation energy asymptotics were used to study strained flames in a variety of situations, all with variable density. In other works, also using asymptotics, constant density flames were studied (Buckmaster and Mikolaitis, 1982, Buckmaster and Ludford, 1982, 1983. In addition, the problem has been studied numerically by Darabiha, Candel, and Marble (1986).…”

Section: Introductionmentioning

confidence: 98%

Unsteady Strained Premixed Laminar Flames

Rutland

Ferziger²

1990

Combustion Science and Technology

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The transient response of laminar flames to strain is studied numerically using a simplifying transformation not previously applied to these problems. Two time scales were found to characterize the flame response during straining. For slow strain. a slow time scale associated with the preheat zone dominates. For high strain. a fast time scale related to the reaction zone is important. The cross-over between these time scales is a function of the activation energy and occurs when the reaction zone thickness is a significant fraction of the total flame thickness. The overall time constant of the flame varies with the Darnkohler number to the 0.7 power. During relaxation from the strained state, the flame responds in a more self-similar manner and a single time constant suffices to describe its behaviour. The implications of these results for flarnelet models based on the local strain rate are that flame response time and history effects should be included. A, jJ. c p Pre-exponential factor, viscosity, specific heat at constant pressure (dimensional) B Metric in first transformation c Passive scalar c Ration of strain rates in the plane of the flame Da Damk6hler number SL Laminar flame speed (dimensional) SSTRAIN Strained flame speed Sa' s, Exponential fits to SSTRAIN S. r; Applied strain rate tensor and components t, Xi Time and space variables .t' Time and space variable in first transformation I, t1

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“…DNS results show that as a result, the mean strain is generally found to be biased toward positive values [31]. Since, except for weak strain in mixtures with low Lewis numbers, the effect of strain is to decrease SL [32], turbulent combustion models that incorporate flame stretch effects predict increasing flame stretch (i.e. increasing Ka) decreases ST. Additionally, according to this mechanism one would expect that at fixed U, UT would be higher in mixtures with low Le, an expectation that is conf'Lrmed experimentally [33].…”

Section: Flame Stretch Effectsmentioning

confidence: 94%

Some open issues in premixed turbulent combustion

Ronney

Modeling in Combustion Science

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The widely studied subject of premixed turbulent combustion is discussed, with particular attention to identification and review of controversial and unresolved fundamental issues having practical significance. Four such topics are discussed: (1) prediction of turbulent burning velocity (ST) in the flamelet regime, (2) the role of the velocity spectrum on ST, (3) the existence and properties of turbulent combustion with distributed reaction zones, and (4) quenching of flames by turbulence. Directions for future research are suggested.

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The premixed flame in a counterflow

Cited by 62 publications

References 4 publications

Theory of Interactive Combustion of Counterflow Premixed Flames

Theory of Interactive Combustion of Counterflow Premixed Flames

Unsteady Strained Premixed Laminar Flames

Some open issues in premixed turbulent combustion

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