Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater
In this work, attenuating unsteady heat-driven thermoacoustic oscillations in a T-shaped standing-wave Rijke-type combustor is numerically and experimentally studied. For this, 2D numerical studies are conducted first on a T-shaped standing-wave combustor. In such combustor, a heater with constant s...
| 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/10356/151147 |
| _version_ | 1811687000642682880 |
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| author | Wu, Gang Xu, Xiao Li, Shihuai Ji, Chenzhen |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Wu, Gang Xu, Xiao Li, Shihuai Ji, Chenzhen |
| author_sort | Wu, Gang |
| collection | NTU |
| description | In this work, attenuating unsteady heat-driven thermoacoustic oscillations in a T-shaped standing-wave Rijke-type combustor is numerically and experimentally studied. For this, 2D numerical studies are conducted first on a T-shaped standing-wave combustor. In such combustor, a heater with constant surface temperature of 1100 K is confined in the bottom branch. However, a secondary heater with a controllable surface temperature is enclosed in the horizontal bifurcating branch. When the secondary heater is not actuated, large-amplitude limit cycle oscillations are successfully generated. However, as the secondary heater surface temperature is increased to 1600 K, the limit cycle oscillations are completely mitigated. To validate these findings, experimental study is then conducted on a T-shaped combustor. A premixed flame is enclosed in the bottom branch and an electrical heater is implemented to attenuate unstable combustion oscillations generated by the flame. When the electrical heater is not actuated, premixed flame-excited thermoacoustic oscillations are generated at approximately 210 Hz. However, with the heater being actuated, sound pressure level is successfully reduced from 130 dB to 85 dB. The present work opens up an alternative control approach to enable combustors being operated stably. |
| first_indexed | 2024-10-01T05:09:21Z |
| format | Journal Article |
| id | ntu-10356/151147 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:09:21Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1511472021-06-29T01:25:31Z Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater Wu, Gang Xu, Xiao Li, Shihuai Ji, Chenzhen School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Thermoacoustics Combustion Instability In this work, attenuating unsteady heat-driven thermoacoustic oscillations in a T-shaped standing-wave Rijke-type combustor is numerically and experimentally studied. For this, 2D numerical studies are conducted first on a T-shaped standing-wave combustor. In such combustor, a heater with constant surface temperature of 1100 K is confined in the bottom branch. However, a secondary heater with a controllable surface temperature is enclosed in the horizontal bifurcating branch. When the secondary heater is not actuated, large-amplitude limit cycle oscillations are successfully generated. However, as the secondary heater surface temperature is increased to 1600 K, the limit cycle oscillations are completely mitigated. To validate these findings, experimental study is then conducted on a T-shaped combustor. A premixed flame is enclosed in the bottom branch and an electrical heater is implemented to attenuate unstable combustion oscillations generated by the flame. When the electrical heater is not actuated, premixed flame-excited thermoacoustic oscillations are generated at approximately 210 Hz. However, with the heater being actuated, sound pressure level is successfully reduced from 130 dB to 85 dB. The present work opens up an alternative control approach to enable combustors being operated stably. This work is financially supported by National Natural Science Foundation Key Project of China with Grant No. 91541121, Scientific Research Fund of Hunan Provincial Education Department with Grant No. 6B235 and National Natural Science Foundation of China with Grant Nos. 51206148, 51476145, 51476146 and 51506079. It is gratefully acknowledged. 2021-06-29T01:25:31Z 2021-06-29T01:25:31Z 2019 Journal Article Wu, G., Xu, X., Li, S. & Ji, C. (2019). Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater. Energy, 174, 1276-1282. https://dx.doi.org/10.1016/j.energy.2019.03.042 0360-5442 https://hdl.handle.net/10356/151147 10.1016/j.energy.2019.03.042 2-s2.0-85063629332 174 1276 1282 en Energy © 2019 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Thermoacoustics Combustion Instability Wu, Gang Xu, Xiao Li, Shihuai Ji, Chenzhen Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title | Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title_full | Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title_fullStr | Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title_full_unstemmed | Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title_short | Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater |
| title_sort | experimental studies of mitigating premixed flame excited thermoacoustic oscillations in t shaped combustor using an electrical heater |
| topic | Engineering::Mechanical engineering Thermoacoustics Combustion Instability |
| url | https://hdl.handle.net/10356/151147 |
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