Flame Extinction Dynamics of Lean Premixed Bluff-Body Stabilized Flames

2015 ◽  
Author(s):  
Marissa K. Geikie ◽  
Kareem Ahmed
Keyword(s):  
Bluff Body ◽  
Flame Extinction ◽  
Lean Premixed ◽  
Stabilized Flames

Mechanisms of flame extinction and lean blowout of bluff body stabilized flames

2019 ◽  
Vol 203 ◽  
pp. 31-45 ◽  
Author(s):  
Anthony J. Morales ◽  
Ian M. Lasky ◽  
Marissa K. Geikie ◽  
Christian A. Engelmann ◽  
Kareem A. Ahmed
Keyword(s):  
Bluff Body ◽  
Flame Extinction ◽  
Lean Blowout ◽  
Stabilized Flames

scholarly journals Modelling of a Bluff-Body Stabilised Premixed Flames Close to Blow-Off

Computation ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 43
Author(s):  
Shokri Amzin ◽  
Mohd Fairus Mohd Yasin
Keyword(s):  
Bluff Body ◽  
Fluid Dynamic ◽  
Premixed Flames ◽  
Pollutant Emissions ◽  
Moment Closure ◽  
Recirculation Region ◽  
Scalar Dissipation ◽  
Average Error ◽  
Conditional Moment ◽  
Lean Premixed

As emission legislation becomes more stringent, the modelling of turbulent lean premixed combustion is becoming an essential tool for designing efficient and environmentally friendly combustion systems. However, to predict emissions, reliable predictive models are required. Among the promising methods capable of predicting pollutant emissions with a long chemical time scale, such as nitrogen oxides (NOx), is conditional moment closure (CMC). However, the practical application of this method to turbulent premixed flames depends on the precision of the conditional scalar dissipation rate,. In this study, an alternative closure for this term is implemented in the RANS-CMC method. The method is validated against the velocity, temperature, and gas composition measurements of lean premixed flames close to blow-off, within the limit of computational fluid dynamic (CFD) capability. Acceptable agreement is achieved between the predicted and measured values near the burner, with an average error of 15%. The model reproduces the flame characteristics; some discrepancies are found within the recirculation region due to significant turbulence intensity.

scholarly journals Pressure gradient tailoring effects on the mechanisms of bluff-body flame extinction

2020 ◽  
Vol 215 ◽  
pp. 224-237 ◽  
Author(s):  
Anthony J. Morales ◽  
Jonathan Reyes ◽  
Peter H. Joo ◽  
Isaac Boxx ◽  
Kareem A. Ahmed
Keyword(s):  
Pressure Gradient ◽  
Bluff Body ◽  
Flame Extinction

Effects of preferential transport in turbulent bluff-body-stabilized lean premixed CH4/air flames

2012 ◽  
Vol 159 (8) ◽  
pp. 2563-2575 ◽  
Author(s):  
Robert S. Barlow ◽  
Matthew J. Dunn ◽  
Mark S. Sweeney ◽  
Simone Hochgreb
Keyword(s):  
Bluff Body ◽  
Lean Premixed ◽  
Preferential Transport

Extinction Conditions of Low-Speed Ballistic Bluff-Body Stabilized Flames

2017 ◽  
Author(s):  
Christian Engelmann ◽  
Marissa K. Geikie ◽  
Anthony J. Morales ◽  
Kareem Ahmed
Keyword(s):  
Bluff Body ◽  
Low Speed ◽  
Stabilized Flames

scholarly journals Joint Scalar versus Joint Velocity-Scalar PDF Simulations of Bluff-Body Stabilized Flames with REDIM

2008 ◽  
Vol 82 (2) ◽  
pp. 185-209 ◽  
Author(s):  
B. Merci ◽  
B. Naud ◽  
D. Roekaerts ◽  
U. Maas
Keyword(s):  
Bluff Body ◽  
Stabilized Flames ◽  
Joint Velocity
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