Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave
Flame stability plays an important role in a combustion/propulsion system, which involves the interaction between flow, acoustics, and flame. Although intensive studies have been carried out to investigate the flame-acoustic interactions, the jet flame excited by standing waves formed in a longitudi...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/89984 http://hdl.handle.net/10220/46453 |
| _version_ | 1826121160531640320 |
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| author | Tarique, Ashique Akram Chen, Song Zhao, He Tay, Koong Jye |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Tarique, Ashique Akram Chen, Song Zhao, He Tay, Koong Jye |
| author_sort | Tarique, Ashique Akram |
| collection | NTU |
| description | Flame stability plays an important role in a combustion/propulsion system, which involves the interaction between flow, acoustics, and flame. Although intensive studies have been carried out to investigate the flame-acoustic interactions, the jet flame excited by standing waves formed in a longitudinal tube has not received much attention. In this work, a methane-burnt (CH4) jet diffusion flame in a longitudinal tube with a standing wave produced from a loudspeaker is studied numerically. 2-D unsteady RANS simulations are performed by using ANSYS FLUENT with the standard k−ɛ turbulence model and a one-step Eddy-Dissipation combustion model. The acoustic fluctuations are generated by using User Defined Functions. The numerical results show that a longitudinal standing wave can be successfully obtained in the tube by the numerical method, and both the acoustic velocity node and antinode can be observed. It is also found that the jet flame characteristics are highly sensitive to its axial location in the tube when the standing wave is present. The flame is unsteady when it is located at the velocity antinode where large velocity fluctuation exists. When the jet is placed at acoustic velocity nodes, however, the flame is relatively steady. Although the minimum velocity fluctuation at the two velocity nodes is almost at the same level, different flame temperatures are observed, due to the different turbulence kinetic energy. |
| first_indexed | 2024-10-01T05:28:10Z |
| format | Journal Article |
| id | ntu-10356/89984 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:28:10Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/899842023-03-04T17:12:12Z Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave Tarique, Ashique Akram Chen, Song Zhao, He Tay, Koong Jye School of Mechanical and Aerospace Engineering Flame/Acoustic Interaction Acoustic Standing Wave DRNTU::Engineering::Aeronautical engineering Flame stability plays an important role in a combustion/propulsion system, which involves the interaction between flow, acoustics, and flame. Although intensive studies have been carried out to investigate the flame-acoustic interactions, the jet flame excited by standing waves formed in a longitudinal tube has not received much attention. In this work, a methane-burnt (CH4) jet diffusion flame in a longitudinal tube with a standing wave produced from a loudspeaker is studied numerically. 2-D unsteady RANS simulations are performed by using ANSYS FLUENT with the standard k−ɛ turbulence model and a one-step Eddy-Dissipation combustion model. The acoustic fluctuations are generated by using User Defined Functions. The numerical results show that a longitudinal standing wave can be successfully obtained in the tube by the numerical method, and both the acoustic velocity node and antinode can be observed. It is also found that the jet flame characteristics are highly sensitive to its axial location in the tube when the standing wave is present. The flame is unsteady when it is located at the velocity antinode where large velocity fluctuation exists. When the jet is placed at acoustic velocity nodes, however, the flame is relatively steady. Although the minimum velocity fluctuation at the two velocity nodes is almost at the same level, different flame temperatures are observed, due to the different turbulence kinetic energy. Published version 2018-10-29T03:57:08Z 2019-12-06T17:38:01Z 2018-10-29T03:57:08Z 2019-12-06T17:38:01Z 2017 Journal Article Chen, S., Zhao, H., Tay, K. J., & Tarique, A. A. (2017). Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave. Energy Procedia, 105, 1539-1544. doi:10.1016/j.egypro.2017.03.471 1876-6102 https://hdl.handle.net/10356/89984 http://hdl.handle.net/10220/46453 10.1016/j.egypro.2017.03.471 en Energy Procedia © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 6 p. application/pdf |
| spellingShingle | Flame/Acoustic Interaction Acoustic Standing Wave DRNTU::Engineering::Aeronautical engineering Tarique, Ashique Akram Chen, Song Zhao, He Tay, Koong Jye Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title | Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title_full | Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title_fullStr | Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title_full_unstemmed | Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title_short | Numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| title_sort | numerical study of a methane jet diffusion flame in a longitudinal tube with a standing wave |
| topic | Flame/Acoustic Interaction Acoustic Standing Wave DRNTU::Engineering::Aeronautical engineering |
| url | https://hdl.handle.net/10356/89984 http://hdl.handle.net/10220/46453 |
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