Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater
The present work considers mitigating combustion instability occurred in a conventional Rijke-type combustor and a Y-shaped one. For this, theoretical, numerical and experimental studies are conducted to shed lights on the role of applying a heater on suppressing flame-exited oscillations. Theoretic...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/151099 |
| _version_ | 1811680255839043584 |
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| author | Wu, Gang Lu, Zhengli Pan, Weichen Guan, Yiheng Li, Shihuai Ji, Chenzen |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Wu, Gang Lu, Zhengli Pan, Weichen Guan, Yiheng Li, Shihuai Ji, Chenzen |
| author_sort | Wu, Gang |
| collection | NTU |
| description | The present work considers mitigating combustion instability occurred in a conventional Rijke-type combustor and a Y-shaped one. For this, theoretical, numerical and experimental studies are conducted to shed lights on the role of applying a heater on suppressing flame-exited oscillations. Theoretical modal analysis shows that the heater acts like an acoustic absorber. Further 2D numerical investigations are conducted on a Rijke-type combustor, in which a propane-fuelled flame and heating bands with constant surface temperatures are implemented at upstream and downstream of the combustor. Limit cycle oscillations produced by the flame are found to be significantly suppressed, if the surface temperature of the heating bands is large enough. Experimental study is then performed on a Rijke tube, in which implementing a heater leads to the unstable combustion system being successfully stabilized. Further validation of the proposed control approach is performed by implementing the electrical heater in an upper branch of a Y-shaped combustor. A premixed propane-fuelled flame is enclosed in the bottom stem. When the heater is not actuated, self-excited thermoacoustic oscillations are generated at approximately 190 Hz. However, with the heater being actuated, sound pressure level is successfully reduced from 130 dB to 80 dB. The present work opens up an alternative but practical control approach to enable combustors being operated stably. |
| first_indexed | 2024-10-01T03:22:09Z |
| format | Journal Article |
| id | ntu-10356/151099 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:22:09Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1510992021-06-24T08:54:16Z Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater Wu, Gang Lu, Zhengli Pan, Weichen Guan, Yiheng Li, Shihuai Ji, Chenzen School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Thermoacoustics Combustion Instability The present work considers mitigating combustion instability occurred in a conventional Rijke-type combustor and a Y-shaped one. For this, theoretical, numerical and experimental studies are conducted to shed lights on the role of applying a heater on suppressing flame-exited oscillations. Theoretical modal analysis shows that the heater acts like an acoustic absorber. Further 2D numerical investigations are conducted on a Rijke-type combustor, in which a propane-fuelled flame and heating bands with constant surface temperatures are implemented at upstream and downstream of the combustor. Limit cycle oscillations produced by the flame are found to be significantly suppressed, if the surface temperature of the heating bands is large enough. Experimental study is then performed on a Rijke tube, in which implementing a heater leads to the unstable combustion system being successfully stabilized. Further validation of the proposed control approach is performed by implementing the electrical heater in an upper branch of a Y-shaped combustor. A premixed propane-fuelled flame is enclosed in the bottom stem. When the heater is not actuated, self-excited thermoacoustic oscillations are generated at approximately 190 Hz. However, with the heater being actuated, sound pressure level is successfully reduced from 130 dB to 80 dB. The present work opens up an alternative but practical control approach to enable combustors being operated stably. This work is financially supported by National Natural Science Foundation of China with Grant Nos. 51406017, 51206148, 51476145, 51476146, 51776188 and 51506079, Key Laboratory Open Research Subject of Vehicle Measurement, Control and Safety of Sichuan Province (szjj2016-080), Open Research Subject of State Key Laboratory of Engines, China (K2018-07); Key Laboratory Open Research Subject of Advanced Manufacture Technology for Automobile Parts (Grant No. 2017KLMT02, Chongqing University of Technology), Ministry of Education, China. It is gratefully acknowledged. 2021-06-24T08:54:16Z 2021-06-24T08:54:16Z 2019 Journal Article Wu, G., Lu, Z., Pan, W., Guan, Y., Li, S. & Ji, C. (2019). Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater. Applied Energy, 239, 331-342. https://dx.doi.org/10.1016/j.apenergy.2019.01.133 0306-2619 https://hdl.handle.net/10356/151099 10.1016/j.apenergy.2019.01.133 2-s2.0-85060891766 239 331 342 en Applied Energy © 2019 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Thermoacoustics Combustion Instability Wu, Gang Lu, Zhengli Pan, Weichen Guan, Yiheng Li, Shihuai Ji, Chenzen Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title | Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title_full | Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title_fullStr | Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title_full_unstemmed | Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title_short | Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater |
| title_sort | experimental demonstration of mitigating self excited combustion oscillations using an electrical heater |
| topic | Engineering::Mechanical engineering Thermoacoustics Combustion Instability |
| url | https://hdl.handle.net/10356/151099 |
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