Experimental study on effects of ammonia enrichment on the thermoacoustic instability of lean premixed swirling methane flames
(2024) In Fuel 357.- Abstract
Ammonia (NH3) has recently emerged as a promising carbon-free energy carrier. Further development and application of NH3 as fuel in the gas turbine industry can significantly reduce the emissions of carbon dioxide (CO2) and contribute to the achievement of a carbon–neutral society. This study experimentally examined the thermoacoustic instability characteristics of a laboratory-scaled lean premixed gas turbine model combustor operated with different NH3 blending ratios with methane (CH4). Experiments conducted under a wide range of inlet velocities and equivalence ratios suggest that NH3 concentration is critical in determining the characteristics of the instability.... (More)
Ammonia (NH3) has recently emerged as a promising carbon-free energy carrier. Further development and application of NH3 as fuel in the gas turbine industry can significantly reduce the emissions of carbon dioxide (CO2) and contribute to the achievement of a carbon–neutral society. This study experimentally examined the thermoacoustic instability characteristics of a laboratory-scaled lean premixed gas turbine model combustor operated with different NH3 blending ratios with methane (CH4). Experiments conducted under a wide range of inlet velocities and equivalence ratios suggest that NH3 concentration is critical in determining the characteristics of the instability. Specifically, when the NH3 proportion is less than 50 %, the addition of NH3 causes a mode transition of the instability. However, when the content of NH3 is greater than 50 %, it is shown that the instabilities are suppressed, indicating that the addition of a certain amount of NH3 can enhance the stability of CH4 flames. Additional analysis of flame dynamics reveals that the introduction of NH3 causes the lengthening of the flame front and weakens heat release rate fluctuations in the flame root regions. Further Proper Orthogonal Decomposition (POD) analysis of the flow field shows that the instability modes are strongly coupled with periodic vortex motions of the flow dynamics along the shear layers. Finally, the mode shifting phenomena is successfully predicted by low-order thermoacoustic network modeling. It is suggested that the change in convective time delay caused by NH3 addition is responsible for such transitions.
(Less)
- author
- Liu, Chunyu ; Yang, Haojie ; Ruan, Can LU ; Yu, Liang ; Nan, Jiaqi ; Li, Jingxuan and Lu, Xingcai
- organization
- publishing date
- 2024-02-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Ammonia, Combustion instability, Lean premixed swirl flame, Low-order modeling, Mode shifting
- in
- Fuel
- volume
- 357
- article number
- 129796
- publisher
- Elsevier
- external identifiers
-
- scopus:85171456430
- ISSN
- 0016-2361
- DOI
- 10.1016/j.fuel.2023.129796
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2023 The Authors
- id
- 9fe95bbd-e6b9-4b80-84cf-661fa18914c5
- date added to LUP
- 2023-12-01 11:29:50
- date last changed
- 2023-12-01 11:29:50
@article{9fe95bbd-e6b9-4b80-84cf-661fa18914c5,
abstract = {{<p>Ammonia (NH<sub>3</sub>) has recently emerged as a promising carbon-free energy carrier. Further development and application of NH<sub>3</sub> as fuel in the gas turbine industry can significantly reduce the emissions of carbon dioxide (CO<sub>2</sub>) and contribute to the achievement of a carbon–neutral society. This study experimentally examined the thermoacoustic instability characteristics of a laboratory-scaled lean premixed gas turbine model combustor operated with different NH<sub>3</sub> blending ratios with methane (CH<sub>4</sub>). Experiments conducted under a wide range of inlet velocities and equivalence ratios suggest that NH<sub>3</sub> concentration is critical in determining the characteristics of the instability. Specifically, when the NH<sub>3</sub> proportion is less than 50 %, the addition of NH<sub>3</sub> causes a mode transition of the instability. However, when the content of NH<sub>3</sub> is greater than 50 %, it is shown that the instabilities are suppressed, indicating that the addition of a certain amount of NH<sub>3</sub> can enhance the stability of CH<sub>4</sub> flames. Additional analysis of flame dynamics reveals that the introduction of NH<sub>3</sub> causes the lengthening of the flame front and weakens heat release rate fluctuations in the flame root regions. Further Proper Orthogonal Decomposition (POD) analysis of the flow field shows that the instability modes are strongly coupled with periodic vortex motions of the flow dynamics along the shear layers. Finally, the mode shifting phenomena is successfully predicted by low-order thermoacoustic network modeling. It is suggested that the change in convective time delay caused by NH<sub>3</sub> addition is responsible for such transitions.</p>}},
author = {{Liu, Chunyu and Yang, Haojie and Ruan, Can and Yu, Liang and Nan, Jiaqi and Li, Jingxuan and Lu, Xingcai}},
issn = {{0016-2361}},
keywords = {{Ammonia; Combustion instability; Lean premixed swirl flame; Low-order modeling; Mode shifting}},
language = {{eng}},
month = {{02}},
publisher = {{Elsevier}},
series = {{Fuel}},
title = {{Experimental study on effects of ammonia enrichment on the thermoacoustic instability of lean premixed swirling methane flames}},
url = {{http://dx.doi.org/10.1016/j.fuel.2023.129796}},
doi = {{10.1016/j.fuel.2023.129796}},
volume = {{357}},
year = {{2024}},
}