Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations
The present work investigates blowout dynamics of premixed swirl flames under low-frequency high-amplitude flow pulsations from the fuel feedline, and applies microsecond repetitively pulsed discharges with extremely-low power consumption to precisely control the stability of pulsating flames. First...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Applications in Energy and Combustion Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666352X23000110 |
| _version_ | 1797802124111773696 |
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| author | Jinguo Sun Hu Wu Yong Tang Chengdong Kong Shuiqing Li |
| author_facet | Jinguo Sun Hu Wu Yong Tang Chengdong Kong Shuiqing Li |
| author_sort | Jinguo Sun |
| collection | DOAJ |
| description | The present work investigates blowout dynamics of premixed swirl flames under low-frequency high-amplitude flow pulsations from the fuel feedline, and applies microsecond repetitively pulsed discharges with extremely-low power consumption to precisely control the stability of pulsating flames. First, both positive and negative fuel pulsations deteriorate the flame stability, causing much-narrowed lean blowout regimes. The fuel pulsation causes the flame to remain at the fuel-lean condition for a long period of time, which is considered to be the main cause of flame blowout. The flame response can be further explained by the convection process of the equivalence ratio oscillation. Secondly, the microsecond pulsed discharge with the same repetition rate as the fuel pulsation is used to alter the lean blowout via thermal, kinetic, and hydrodynamics effects. More importantly, the time delay between the discharge pulse and the fuel pulsation determines whether the plasma has an enhancement effect or not. It is found that the discharge prior to the convection of the equivalence ratio pulsation reaches the optimal effectiveness for flame stabilization, extending the blowout limit by approximately 10%. Finally, the lean blowout limit can be continuously extended with the increasing discharge repetition rate until saturation. |
| first_indexed | 2024-03-13T05:00:56Z |
| format | Article |
| id | doaj.art-a41e2b6f4a6e4e4e9661f405d78c6f12 |
| institution | Directory Open Access Journal |
| issn | 2666-352X |
| language | English |
| last_indexed | 2024-03-13T05:00:56Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applications in Energy and Combustion Science |
| spelling | doaj.art-a41e2b6f4a6e4e4e9661f405d78c6f122023-06-17T05:21:03ZengElsevierApplications in Energy and Combustion Science2666-352X2023-06-0114100122Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsationsJinguo Sun0Hu Wu1Yong Tang2Chengdong Kong3Shuiqing Li4Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, ChinaKey Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, ChinaSchool of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, ChinaInstitute of Thermal Energy Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaKey Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China; Corresponding author.The present work investigates blowout dynamics of premixed swirl flames under low-frequency high-amplitude flow pulsations from the fuel feedline, and applies microsecond repetitively pulsed discharges with extremely-low power consumption to precisely control the stability of pulsating flames. First, both positive and negative fuel pulsations deteriorate the flame stability, causing much-narrowed lean blowout regimes. The fuel pulsation causes the flame to remain at the fuel-lean condition for a long period of time, which is considered to be the main cause of flame blowout. The flame response can be further explained by the convection process of the equivalence ratio oscillation. Secondly, the microsecond pulsed discharge with the same repetition rate as the fuel pulsation is used to alter the lean blowout via thermal, kinetic, and hydrodynamics effects. More importantly, the time delay between the discharge pulse and the fuel pulsation determines whether the plasma has an enhancement effect or not. It is found that the discharge prior to the convection of the equivalence ratio pulsation reaches the optimal effectiveness for flame stabilization, extending the blowout limit by approximately 10%. Finally, the lean blowout limit can be continuously extended with the increasing discharge repetition rate until saturation.http://www.sciencedirect.com/science/article/pii/S2666352X23000110Fuel pulsation disturbancePremixed swirl flame (PSF)Lean blowout (LBO) limitsMicrosecond repetitively pulsed (MRP) dischargesDischarge time delay |
| spellingShingle | Jinguo Sun Hu Wu Yong Tang Chengdong Kong Shuiqing Li Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations Applications in Energy and Combustion Science Fuel pulsation disturbance Premixed swirl flame (PSF) Lean blowout (LBO) limits Microsecond repetitively pulsed (MRP) discharges Discharge time delay |
| title | Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations |
| title_full | Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations |
| title_fullStr | Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations |
| title_full_unstemmed | Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations |
| title_short | Blowout dynamics and plasma-assisted stabilization of premixed swirl flames under fuel pulsations |
| title_sort | blowout dynamics and plasma assisted stabilization of premixed swirl flames under fuel pulsations |
| topic | Fuel pulsation disturbance Premixed swirl flame (PSF) Lean blowout (LBO) limits Microsecond repetitively pulsed (MRP) discharges Discharge time delay |
| url | http://www.sciencedirect.com/science/article/pii/S2666352X23000110 |
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