TY - JOUR
T1 - Study of the Combined Effect of Ammonia Addition and Air Coflow Velocity on a Non-premixed Methane Jet Flame Stabilization
AU - Colson, Sophie
AU - Kuhni, Manuel
AU - Galizzi, Cédric
AU - Escudié, Dany
AU - Kobayashi, Hideaki
N1 - Funding Information:
This work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University, and in the framework of the Japan-France International Associated Laboratory (LIA) ELyT Global.
Publisher Copyright:
© 2020 Taylor & Francis Group, LLC.
PY - 2022
Y1 - 2022
N2 - Ammonia is a promising carbon-free fuel that can be used for CO2 reduction. However, ammonia industrial use presents challenges, including flame stabilization. In this study, a non-premixed methane-ammonia jet flame in an air coflow was considered to observe the effects of ammonia addition on conventional fuels flame stabilization. First, the effects of the introduction of ammonia on the stabilization regimes of the methane jet flame were studied. Then the coupled effects of the variation in ammonia concentration and air coflow velocity on flame stabilization were investigated. In the present jet configuration, a sharp reduction of the stabilization domain was observed with ammonia addition: the liftoff and re-attachment velocities were obtained for mixtures of up to 50% of ammonia in the fuel, a ratio above which the flame could not be stabilized. When increasing the coflow velocity, a sudden drop in the re-attachment velocity occurred for methane/ammonia flames. This re-attachment drop was associated with an increase in the height of the lifted flame when the jet velocity decreases before re-attachment, for large enough coflow velocity and ammonia concentration. A critical height above which the lifted flames all present the same ascending behavior could be defined and characterizes this peculiar phenomenon.
AB - Ammonia is a promising carbon-free fuel that can be used for CO2 reduction. However, ammonia industrial use presents challenges, including flame stabilization. In this study, a non-premixed methane-ammonia jet flame in an air coflow was considered to observe the effects of ammonia addition on conventional fuels flame stabilization. First, the effects of the introduction of ammonia on the stabilization regimes of the methane jet flame were studied. Then the coupled effects of the variation in ammonia concentration and air coflow velocity on flame stabilization were investigated. In the present jet configuration, a sharp reduction of the stabilization domain was observed with ammonia addition: the liftoff and re-attachment velocities were obtained for mixtures of up to 50% of ammonia in the fuel, a ratio above which the flame could not be stabilized. When increasing the coflow velocity, a sudden drop in the re-attachment velocity occurred for methane/ammonia flames. This re-attachment drop was associated with an increase in the height of the lifted flame when the jet velocity decreases before re-attachment, for large enough coflow velocity and ammonia concentration. A critical height above which the lifted flames all present the same ascending behavior could be defined and characterizes this peculiar phenomenon.
KW - ammonia-methane mixture
KW - hysteresis
KW - non-premixed jet flame
KW - stabilization regimes
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U2 - 10.1080/00102202.2020.1830276
DO - 10.1080/00102202.2020.1830276
M3 - Article
AN - SCOPUS:85092283831
VL - 194
SP - 1747
EP - 1767
JO - Combustion Science and Technology
JF - Combustion Science and Technology
SN - 0010-2202
IS - 9
ER -