Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering
The aim of this present study is to examine the critical role of air-fuel equivalence ratio Ф and air flow rate on triggering self-excited thermoacoustic oscillations in a swirling combustor, which is widely applied in industry to achieve low combustion emissions. For this, experimental study of the...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/141029 |
| _version_ | 1811691596239863808 |
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| author | Wu, Gang Lu, ZhengLi Guan, Yiheng Li, Yuelin Ji, Chen Zhen |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Wu, Gang Lu, ZhengLi Guan, Yiheng Li, Yuelin Ji, Chen Zhen |
| author_sort | Wu, Gang |
| collection | NTU |
| description | The aim of this present study is to examine the critical role of air-fuel equivalence ratio Ф and air flow rate on triggering self-excited thermoacoustic oscillations in a swirling combustor, which is widely applied in industry to achieve low combustion emissions. For this, experimental study of the effect of air-fuel equivalence ratio in a propane-burnt swirling combustor is conducted to gain insights on the nonlinear dynamics behaviors of the thermoacoustic oscillations. A series experiments are conducted by varying 1) the air flow rate and 2) the equivalence ratio. It is found that the air flow rate and the equivalence ratio play important roles on producing limit cycle thermoacoustic oscillations. The frequencies and amplitudes of these oscillations strongly depend on the equivalence ratio. In addition, the dominant thermoacoustic mode is found to switch from a higher frequency at ω3 to a lower one at ω1 for a given Φ, as the air flow rate Qa is varied. However, as Qa is set to a given value, increasing the equivalence ratio from 0.8 to 1.2 leads to the dominant frequency being shifted by approximately 20%. In general, the present study sheds lights on the nonlinear characteristics and behaviors of heat-driven acoustic oscillations in a swirling thermoacoustic system. |
| first_indexed | 2024-10-01T06:22:24Z |
| format | Journal Article |
| id | ntu-10356/141029 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:22:24Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1410292020-06-03T07:59:21Z Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering Wu, Gang Lu, ZhengLi Guan, Yiheng Li, Yuelin Ji, Chen Zhen School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Thermoacoustics Heat-to-sound Conversion The aim of this present study is to examine the critical role of air-fuel equivalence ratio Ф and air flow rate on triggering self-excited thermoacoustic oscillations in a swirling combustor, which is widely applied in industry to achieve low combustion emissions. For this, experimental study of the effect of air-fuel equivalence ratio in a propane-burnt swirling combustor is conducted to gain insights on the nonlinear dynamics behaviors of the thermoacoustic oscillations. A series experiments are conducted by varying 1) the air flow rate and 2) the equivalence ratio. It is found that the air flow rate and the equivalence ratio play important roles on producing limit cycle thermoacoustic oscillations. The frequencies and amplitudes of these oscillations strongly depend on the equivalence ratio. In addition, the dominant thermoacoustic mode is found to switch from a higher frequency at ω3 to a lower one at ω1 for a given Φ, as the air flow rate Qa is varied. However, as Qa is set to a given value, increasing the equivalence ratio from 0.8 to 1.2 leads to the dominant frequency being shifted by approximately 20%. In general, the present study sheds lights on the nonlinear characteristics and behaviors of heat-driven acoustic oscillations in a swirling thermoacoustic system. 2020-06-03T07:59:21Z 2020-06-03T07:59:21Z 2018 Journal Article Wu, G., Lu, Z., Guan, Y., Li, Y., & Ji, C. Z. (2018). Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering. Energy, 158, 546-554. doi:10.1016/j.energy.2018.06.056 0360-5442 https://hdl.handle.net/10356/141029 10.1016/j.energy.2018.06.056 2-s2.0-85049353308 158 546 554 en Energy © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Thermoacoustics Heat-to-sound Conversion Wu, Gang Lu, ZhengLi Guan, Yiheng Li, Yuelin Ji, Chen Zhen Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title | Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title_full | Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title_fullStr | Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title_full_unstemmed | Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title_short | Characterizing nonlinear interaction between a premixed swirling flame and acoustics : heat-driven acoustic mode switching and triggering |
| title_sort | characterizing nonlinear interaction between a premixed swirling flame and acoustics heat driven acoustic mode switching and triggering |
| topic | Engineering::Mechanical engineering Thermoacoustics Heat-to-sound Conversion |
| url | https://hdl.handle.net/10356/141029 |
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