An experimental and modeling study on the laminar burning velocities of ammonia + oxygen + argon mixtures
(2023) In Combustion and Flame 255.- Abstract
Most often, the laminar burning velocity (SL) of ammonia was measured in mixtures diluted by nitrogen bearing in mind its potential use as an alternative carbon-free fuel. Replacing the diluent with argon can increase the flame temperature and thus provide additional targets for validating pertinent detailed kinetic models. The SL data for ammonia + oxygen + argon mixtures are scarce; therefore, in the present study, new measurements have been performed using the heat flux method at an initial temperature of 298 K and atmospheric pressure over an equivalence ratio range of 0.4–1.5. The argon mole percentage in the mixture has been changed from 30 to 60%. Nine recent ammonia kinetic models are selected and validated... (More)
Most often, the laminar burning velocity (SL) of ammonia was measured in mixtures diluted by nitrogen bearing in mind its potential use as an alternative carbon-free fuel. Replacing the diluent with argon can increase the flame temperature and thus provide additional targets for validating pertinent detailed kinetic models. The SL data for ammonia + oxygen + argon mixtures are scarce; therefore, in the present study, new measurements have been performed using the heat flux method at an initial temperature of 298 K and atmospheric pressure over an equivalence ratio range of 0.4–1.5. The argon mole percentage in the mixture has been changed from 30 to 60%. Nine recent ammonia kinetic models are selected and validated against these new experimental data, where it is found that the models by Han et al. (Combust. Flame 228 (2021):13), Shrestha et al. (Proc. Combust. Inst. 38 (2021):2163), and Okafor et al. (Combust. Flame 204 (2019):162) provide the best predictions. Further sensitivity analysis showed that the most crucial nitrogen-related reactions for SL in present flames found in the model of Shrestha et al. are different from the other two, and flux analysis elucidated that the main consumption fluxes of NH2 radical are different among the three models. The model of Han et al., which is from the authors’ group, was revisited, and the rate constants for three reactions NH2+H(+M)=NH3(+M), NNH+O[dbnd]NH+NO, and NH2+O[dbnd]HNO+H were modified. Available speciation data from shock tube and flame studies are used to select the most suitable rate constants among expressions recommended in the literature. The updated model performs well in reproducing a range of SL, ignition delay times, and speciation data from a jet-stirred reactor for ammonia + oxygen + argon mixtures.
(Less)
- author
- Chen, Jundie LU ; Lubrano Lavadera, Marco LU and Konnov, Alexander A. LU
- organization
- publishing date
- 2023-09
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Ammonia, Detailed kinetic model, Heat flux method, Laminar burning velocity
- in
- Combustion and Flame
- volume
- 255
- article number
- 112930
- publisher
- Elsevier
- external identifiers
-
- scopus:85166663263
- ISSN
- 0010-2180
- DOI
- 10.1016/j.combustflame.2023.112930
- language
- English
- LU publication?
- yes
- id
- 4c103dd4-54d4-4568-abf9-f82c9545f0b4
- date added to LUP
- 2023-12-08 10:25:53
- date last changed
- 2024-01-30 16:31:03
@article{4c103dd4-54d4-4568-abf9-f82c9545f0b4,
abstract = {{<p>Most often, the laminar burning velocity (S<sub>L</sub>) of ammonia was measured in mixtures diluted by nitrogen bearing in mind its potential use as an alternative carbon-free fuel. Replacing the diluent with argon can increase the flame temperature and thus provide additional targets for validating pertinent detailed kinetic models. The S<sub>L</sub> data for ammonia + oxygen + argon mixtures are scarce; therefore, in the present study, new measurements have been performed using the heat flux method at an initial temperature of 298 K and atmospheric pressure over an equivalence ratio range of 0.4–1.5. The argon mole percentage in the mixture has been changed from 30 to 60%. Nine recent ammonia kinetic models are selected and validated against these new experimental data, where it is found that the models by Han et al. (Combust. Flame 228 (2021):13), Shrestha et al. (Proc. Combust. Inst. 38 (2021):2163), and Okafor et al. (Combust. Flame 204 (2019):162) provide the best predictions. Further sensitivity analysis showed that the most crucial nitrogen-related reactions for S<sub>L</sub> in present flames found in the model of Shrestha et al. are different from the other two, and flux analysis elucidated that the main consumption fluxes of NH<sub>2</sub> radical are different among the three models. The model of Han et al., which is from the authors’ group, was revisited, and the rate constants for three reactions NH<sub>2</sub>+H(+M)=NH<sub>3</sub>(+M), NNH+O[dbnd]NH+NO, and NH<sub>2</sub>+O[dbnd]HNO+H were modified. Available speciation data from shock tube and flame studies are used to select the most suitable rate constants among expressions recommended in the literature. The updated model performs well in reproducing a range of S<sub>L</sub>, ignition delay times, and speciation data from a jet-stirred reactor for ammonia + oxygen + argon mixtures.</p>}},
author = {{Chen, Jundie and Lubrano Lavadera, Marco and Konnov, Alexander A.}},
issn = {{0010-2180}},
keywords = {{Ammonia; Detailed kinetic model; Heat flux method; Laminar burning velocity}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Combustion and Flame}},
title = {{An experimental and modeling study on the laminar burning velocities of ammonia + oxygen + argon mixtures}},
url = {{http://dx.doi.org/10.1016/j.combustflame.2023.112930}},
doi = {{10.1016/j.combustflame.2023.112930}},
volume = {{255}},
year = {{2023}},
}