Stochastic Modeling of a Lifted Methane/Air Jet Flame with Detailed Chemistry

Flashback is a key operability issue for low emission premixed combustion systems operated on high hydrogen content fuels. Previous work investigated fuel composition impacts on flashback propensity and found that burner tip temperature was important in correlating flashback data in premixed jet flames. An enclosure around the jet flame was found to enhance the flame–burner rim interaction. The present study further addresses these issues using a jet burner with various geometric configurations and interchangeable materials. Systematic studies addressing the quantitative influence of various parameters such as tip temperature, burner material, enclosure size, and burner diameter on flashback propensity were carried out. A comprehensive overview of the flashback limits for all conditions tested in the current study as well as those published previously is given. The collective results indicate that the burner materials, tip temperature, and flame confinement play significant roles for flashback propensity and thus help explain previous scatter in flashback data. Furthermore, the present work indicates that the upstream flame propagation during flashback is affected by the burner material. The material with lower thermal conductivity yields larger flashback propensity but slower flame regression inside the tube. These observations can be potentially exploited to minimize the negative impacts of flashback in practical applications.

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Local Exergy Losses of the Sandia Flame D: A Turbulent Piloted Methane–Air Jet Flame

Journal of Engineering Thermophysics ◽

10.1134/s1810232818040069 ◽

2018 ◽

Vol 27 (4) ◽

pp. 422-439

Author(s):

Y. Zhang ◽

P. Xu ◽

B. Li ◽

X. Yu ◽

G. Lorenzini ◽

...

Keyword(s):

Jet Flame ◽

Air Jet ◽

Exergy Losses

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Characterization of confined hydrogen-air jet flame in a crossflow configuration using design of experiments

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2013.02.085 ◽

2013 ◽

Vol 38 (12) ◽

pp. 5165-5175 ◽

Cited By ~ 2

Author(s):

D.P. Mishra ◽

Swarup Y. Jejurkar

Keyword(s):

Design Of Experiments ◽

Jet Flame ◽

Air Jet

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Second-Order Modeling of a Turbulent Nonpremixed H23-Air Jet Flame with Intermittency and Conditional Averaging

Combustion Science and Technology ◽

10.1080/00102208708947031 ◽

1987 ◽

Vol 53 (4-6) ◽

pp. 235-257 ◽

Cited By ~ 3

Author(s):

J. Y. Chen ◽

F. C. Gouldin ◽

J. L. Lumely

Keyword(s):

Second Order ◽

Jet Flame ◽

Air Jet ◽

Turbulent Nonpremixed ◽

Conditional Averaging

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Influence of Burner Material, Tip Temperature and Geometrical Flame Configuration on Flashback Propensity of H2-Air Jet Flames

Volume 1A: Combustion, Fuels and Emissions ◽

10.1115/gt2013-94823 ◽

2013 ◽

Author(s):

Zhixuan Duan ◽

Brendan Shaffer ◽

Vincent McDonell ◽

Georg Baumgartner ◽

Thomas Sattelmayer

Keyword(s):

Jet Flames ◽

Comprehensive Overview ◽

High Hydrogen ◽

Jet Flame ◽

Practical Applications ◽

Geometric Configurations ◽

Air Jet ◽

Low Emission ◽

Flame Burner ◽

Negative Impacts

Flashback is a key operability issue for low emission premixed combustion systems operated on high hydrogen content fuels. Previous work investigated fuel composition impacts on flashback propensity and found that burner tip temperature was important in correlating flashback data in premixed jet flames. An enclosure around the jet flame was found to enhance the flame-burner rim interaction. The present study further addresses these issues using a jet burner with various geometric configurations and interchangeable materials. Systematic studies addressing the quantitative influence of various parameters such as tip temperature, burner material, enclosure size, and burner diameter on flashback propensity were carried out. A comprehensive overview of the flashback limits for all conditions tested in the current study as well as those published previously is given. The collective results indicate that the burner materials, tip temperature and flame confinement play significant roles for flashback propensity and thus help explain previous scatter in flashback data. Furthermore, the present work indicates that the upstream flame propagation during flashback is affected by the burner material. The material with lower thermal conductivity yields larger flashback propensity but slower flame regression inside the tube. These observations can be potentially exploited to minimize the negative impacts of flashback in practical applications.

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Using the tabulated diffusion flamelet model ADF-PCM to simulate a lifted methane–air jet flame

Combustion and Flame ◽

10.1016/j.combustflame.2008.12.012 ◽

2009 ◽

Vol 156 (7) ◽

pp. 1318-1331 ◽

Cited By ~ 54

Author(s):

Jean-Baptiste Michel ◽

Olivier Colin ◽

Christian Angelberger ◽

Denis Veynante

Keyword(s):

Flamelet Model ◽

Jet Flame ◽

Air Jet

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Morphology and Dynamics of a Premixed Hydrogen-Methane-Air Jet Flame in Hot Vitiated Turbulent Crossflow

Volume 4B: Combustion, Fuels, and Emissions ◽

10.1115/gt2020-16282 ◽

2020 ◽

Author(s):

R. Solana-Pérez ◽

L. Miniero ◽

S. Shcherbanev ◽

M. Bothien ◽

N. Noiray

Keyword(s):

Shear Layer ◽

High Speed ◽

Equivalence Ratio ◽

Thermal Power ◽

Atmospheric Condition ◽

Flame Length ◽

Fuel Blend ◽

Time Resolved ◽

Jet Flame ◽

Air Jet

Abstract The effect of hydrogen enrichment of a premixed hydrogen-methane-air jet in hot vitiated crossflow was studied at atmospheric condition. The hot turbulent vitiated crossflow is generated by a symmetric array of 4 × 4 jet flames burning a lean mixture of natural gas and air in fully premixed condition at equivalence ratio φcf = 0.7 and total thermal power of 50 kW. This crossflow is then used to ignite the premixed perpendicular jet of hydrogen-methane-air at ambient temperature. Three jet parameters are varied to study the effect of hydrogen addition on the flame morphology and stabilization mechanism: the hydrogen mass fraction of the H2/CH4 fuel blend (ξ = 0 – 100%), the jet equivalence ratio (φ = 0.8 – 2.0) and the jet-to-crossflow momentum ratio (J = 3 – 12). High-speed hydroxyl (OH) chemiluminescence is used to obtain the time-resolved imaging of the reactive jet and to compute its time averaged morphology. OH planar laser induced fluorescence (OH-PLIF) is used to acquire OH concentration fields at the jet center plane. The jet morphology is analyzed by considering its mean trajectory, extracted from the experimental data and fitted with empirical correlations available from the literature. New correlations are proposed for the flame length, width and center of gravity as function of the hydrogen content. It is shown that with increasing hydrogen fraction, the flame is shortened and more compact, and it stabilizes close to the jet root. Another finding of this work is the reattachment of the flame at the base of the windward jet shear layer when hydrogen fraction is increased. Robust flame anchoring is observed for H2 mass fractions of the CH4/H2 fuel blend that exceed 50%. Moreover, it is shown using instantaneous OH-PLIF images that for these conditions of increasing hydrogen concentration, the windward shear layer features larger-scale coherent structures that govern the aerodynamics of the reactive premixed jet in turbulent vitiated crossflow.

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