Role of intermediate temperature kinetics and radical transport in the prediction of leading edge structure of turbulent lean premixed flames

2019 ◽  
Vol 207 ◽  
pp. 368-378 ◽  
Author(s):  
Yuval Dagan ◽  
Nadim W. Chakroun ◽  
Santosh J. Shanbhogue ◽  
Ahmed F. Ghoniem
Keyword(s):  
Premixed Flames ◽  
Leading Edge ◽  
Intermediate Temperature ◽  
Edge Structure ◽  
Lean Premixed Flames ◽  
Lean Premixed

scholarly journals Dynamics of lean premixed flames stabilized on a meso-scale bluff-body in an unconfined flow field

2018 ◽  
Vol 13 (6) ◽  
pp. 48 ◽  
Author(s):  
Yu Jeong Kim ◽  
Bok Jik Lee ◽  
Hong G. Im
Keyword(s):  
Bluff Body ◽  
Proper Time ◽  
Premixed Flames ◽  
Narrow Channel ◽  
Flame Stabilization ◽  
Inflow Velocity ◽  
Lean Premixed Flames ◽  
Lean Premixed ◽  
The Mean ◽  
Meso Scale

Two-dimensional direct numerical simulations were conducted to investigate the dynamics of lean premixed flames stabilized on a meso-scale bluff-body in hydrogen-air and syngas-air mixtures. To eliminate the flow confinement effect due to the narrow channel, a larger domain size at twenty times the bluff-body dimension was used in the new simulations. Flame/flow dynamics were examined as the mean inflow velocity is incrementally raised until blow-off occurs. As the mean inflow velocity is increased, several distinct modes in the flame shape and fluctuation patterns were observed. In contrast to our previous study with a narrow channel, the onset of local extinction was observed during the asymmetric vortex shedding mode. Consequently, the flame stabilization and blow-off behavior was found to be dictated by the combined effects of the hot product gas pocket entrained into the extinction zone and the ability to auto-ignite the mixture within the given residence time corresponding to the lateral flame fluctuations. A proper time scale analysis is attempted to characterize the flame blow-off mechanism, which turns out to be consistent with the classic theory of Zukoski and Marble.

Noise Sources of Lean Premixed Flames

2019 ◽  
Vol 103 (3) ◽  
pp. 773-796 ◽  
Author(s):  
Konrad Pausch ◽  
Sohel Herff ◽  
Feichi Zhang ◽  
Henning Bockhorn ◽  
Wolfgang Schröder
Keyword(s):  
Premixed Flames ◽  
Noise Sources ◽  
Lean Premixed Flames ◽  
Lean Premixed

scholarly journals 116 Study on Characteristics of Planar Lean Premixed Flames using Low BTU Gas

2014 ◽  
Vol 2014.89 (0) ◽  
pp. _1-16_
Author(s):  
KHUHAPREMA CHANON ◽  
Masaharu KOMIYAMA ◽  
WONGPHAN WAROT
Keyword(s):  
Premixed Flames ◽  
Lean Premixed Flames ◽  
Lean Premixed
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