The effect of coflow velocity on a lifted methane-air jet diffusion flame

Montgomery, Christopher J.; Kaplan, Carolyn R.; Oran, Elaine S.

doi:10.2514/6.1998-805

Cited by 6 publications

(16 citation statements)

References 22 publications

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“…The effect of coflow velocity on flame lift-off has been investigated for a methane/air jet flame in an axisymmetric framework using a semi-global reaction scheme (seven species, four reactions) along with submodels for soot formation and radiation transport for a gray-gas behavior and an optically thin medium [145]. Grid resolution reaches at best 600 £ 200 mm 2 in the flame front.…”

Section: Non-premixed Jet Flamesmentioning

confidence: 99%

Impact of detailed chemistry and transport models on turbulent combustion simulations

Hilbert

Tap

El-Rabii

et al. 2004

Progress in Energy and Combustion Science

142

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Section: Non-premixed Jet Flamesmentioning

confidence: 99%

Impact of detailed chemistry and transport models on turbulent combustion simulations

Hilbert

Tap

El-Rabii

et al. 2004

Progress in Energy and Combustion Science

142

View full text Add to dashboard Cite

“…Figures 10(a) and (b) show the root mean square of dh′/dt plotted with U eff for the small and large nozzles, respectively. The small nozzle data correlated with the equation for U eff when C = 5.2 (the value used in Montgomery et al (1998)). For the large nozzle data, C = 15 provided the best agreement.…”

Section: Rate Of Oscillationsmentioning

confidence: 53%

“…Thus, an effective jet velocity utilizing the density ratio helps to better relate the lifted height to flow velocities. As Montgomery et al (1998) and Kumar et al (2007) discussed, the effective jet velocity is calculated using a relation from Kalghatgi (1982) as:…”

Section: Resultsmentioning

confidence: 99%

“…Numerous studies have investigated the effect of fuel exit conditions on the lift-off height of methane flames both computationally (Muller et al, 1994, Montgomery et al, 1998, Kumar et al, 2007 and experimentally. The increase in liftoff height with increasing jet exit velocity has been observed in many experiments (Muñiz andMungal, 1997, Brown et al, 1999, Lee et al, lifted flames performed by Upatnieks et al (2004) suggest that at low Reynolds numbers, edge flame extinction plays the central role in flame stabilization.…”

Section: Introductionmentioning

confidence: 99%

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Flame Stabilization and Structure of Reaction Zones

Lyons¹

2009

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“…17;18 As the strength of the co ow is increased, for a given jet velocity, the ame tends to spread more slowly, 17 and the length of the combustion zone can increase. 18 Dahm and Dibble,19 in the context of the examination of co ow effects on ame blowout, related the growth and entrainment characteristicsof turbulent jet diffusion ames with co ow to those of nonreacting jets.…”

Section: Introductionmentioning

confidence: 99%

Effects of Coflow on Turbulent Flame Puffs

et al. 2002

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Pulsed, turbulent jet diffusion ames in an air co ow of variable strength were examined experimentally. In all cases, the ames were fully modulated, that is, the fuel ow was completely shut off between pulses. Isolated puffs of unheated ethylene fuel were injected using a 2-mm-diam-nozzle into a combustor with an air co ow at 1-atm pressure. For short injection times (¿ < 50 ms), compact, puf ike structures were generated. The mean ame length of these puffs was at least 51% less than that of a steady-state, that is, nonpulsed, ame for the same injection Reynolds number. More elongated ame structures, with a ame length closer to that of steady-state ames, occurred for longer injection times of up to 300 ms. The addition of co ow generally causes an increase in the mean ame length. For short injection times (¿ < 50 ms), this resulted in an increase in ame length of up to 27% for a co ow strength of U cof /U jet = 0.02. The fractional increase in the ame length due to co ow of pulsed ames with longer injection times, as well as steady ames, was signi cantly less. The mean ame length for the ame with the co ow duct generally exceeded that of the corresponding free ame, even for the case of zero co ow. The amount of co ow required to achieve a given increase in mean ame length is quantitatively consistent with a scaling argument developed as part of this investigation.

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The effect of coflow velocity on a lifted methane-air jet diffusion flame

Cited by 6 publications

References 22 publications

Impact of detailed chemistry and transport models on turbulent combustion simulations

Impact of detailed chemistry and transport models on turbulent combustion simulations

Flame Stabilization and Structure of Reaction Zones

Effects of Coflow on Turbulent Flame Puffs

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