TY - JOUR
T1 - Measurement of the laminar burning velocity and kinetics study of the importance of the hydrogen recovery mechanism of ammonia/hydrogen/air premixed flames
AU - Gotama, Gabriel J.
AU - Hayakawa, Akihiro
AU - Okafor, Ekenechukwu C.
AU - Kanoshima, Ryuhei
AU - Hayashi, Masao
AU - Kudo, Taku
AU - Kobayashi, Hideaki
N1 - Funding Information:
The first author acknowledges the financial supports provided by the Technical University of Munich(Technische Universität München, TUM), German Institute of Science and Technology Pte Ltd (GIST) – TUM Asia, and German Academic Exchange Service (Deutscher Akademischer Austauchdienst, DAAD) through the TUM Asia scholarship and TUM Asia – DAAD Scholarship (Winter Semester 2018/2019 and Summer Semester 2019/2020) for the duration of the joint Master program in aerospace engineering between Nanyang Technological University, Singapore and Technical University of Munich, Germany. The first author appreciates the guidance and input provided by Prof. Oskar J. Haidn from the Department of Aerospace and Geodesy, Technical University of Munich for this study.
Funding Information:
The first author acknowledges the financial supports provided by the Technical University of Munich(Technische Universität München, TUM), German Institute of Science and Technology Pte Ltd (GIST) – TUM Asia, and German Academic Exchange Service (Deutscher Akademischer Austauchdienst, DAAD) through the TUM Asia scholarship and TUM Asia – DAAD Scholarship (Winter Semester 2018/2019 and Summer Semester 2019/2020) for the duration of the joint Master program in aerospace engineering between Nanyang Technological University, Singapore and Technical University of Munich, Germany.
Publisher Copyright:
© 2021
PY - 2022/2
Y1 - 2022/2
N2 - The application of ammonia (NH3) blended with hydrogen (H2) as a fuel in combustion systems is a practical approach to decarbonise the energy sector, and the combustion of the fuel at rich conditions is relevant in emissions control through rich-lean combustion. However, the chemistry of rich NH3/H2 flames at high pressure, and the interaction between NH3 and H2 still need to be clarified. Therefore, the present study focuses on the chemical kinetics of NH3/H2/air flames at rich conditions and elevated pressures. To validate chemical kinetics in the literature, the laminar burning velocity of NH3/H2/Air premixed flames were measured at 0.1 and 0.5 MPa and equivalence ratios up to 1.8. The results show that the seven kinetics mechanisms studied could not satisfactorily predict the measurements at fuel-rich conditions and elevated pressure. The kinetics mechanism by Han et al. was optimized, leading to a new detailed kinetics, which can be reduced to 26 species and 119 reactions and satisfactorily predicts the present measurements and those in the literature. Analysis of the chemistry of NH3/H2 flames using the new mechanism shows NH3 and H2 kinetics are strongly coupled through a H2 decomposition/recovery mechanism, here named H2 recovery mechanism, which is important in modelling the burning velocity of the flame at fuel-rich conditions. The burned gas Markstein length was also extracted from the measured flame speed and its behaviour was studied using theoretical correlations.
AB - The application of ammonia (NH3) blended with hydrogen (H2) as a fuel in combustion systems is a practical approach to decarbonise the energy sector, and the combustion of the fuel at rich conditions is relevant in emissions control through rich-lean combustion. However, the chemistry of rich NH3/H2 flames at high pressure, and the interaction between NH3 and H2 still need to be clarified. Therefore, the present study focuses on the chemical kinetics of NH3/H2/air flames at rich conditions and elevated pressures. To validate chemical kinetics in the literature, the laminar burning velocity of NH3/H2/Air premixed flames were measured at 0.1 and 0.5 MPa and equivalence ratios up to 1.8. The results show that the seven kinetics mechanisms studied could not satisfactorily predict the measurements at fuel-rich conditions and elevated pressure. The kinetics mechanism by Han et al. was optimized, leading to a new detailed kinetics, which can be reduced to 26 species and 119 reactions and satisfactorily predicts the present measurements and those in the literature. Analysis of the chemistry of NH3/H2 flames using the new mechanism shows NH3 and H2 kinetics are strongly coupled through a H2 decomposition/recovery mechanism, here named H2 recovery mechanism, which is important in modelling the burning velocity of the flame at fuel-rich conditions. The burned gas Markstein length was also extracted from the measured flame speed and its behaviour was studied using theoretical correlations.
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U2 - 10.1016/j.combustflame.2021.111753
DO - 10.1016/j.combustflame.2021.111753
M3 - Article
AN - SCOPUS:85116368604
VL - 236
JO - Combustion and Flame
JF - Combustion and Flame
SN - 0010-2180
M1 - 111753
ER -