Academic Journal
Mechanism on oscillating lifted flames in nonpremixed laminar coflow jets
| العنوان: | Mechanism on oscillating lifted flames in nonpremixed laminar coflow jets |
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| المؤلفون: | Van, Kyu Ho, Park, Jeong, Yoon, Sung Hwan, Chung, Suk Ho, Cha, Min Suk |
| المساهمون: | Clean Combustion Research Center, Combustion and Laser Diagnostics Laboratory, Mechanical Engineering Program, Physical Science and Engineering (PSE) Division, Department of Mechanical Engineering, Pukyong National University, Busan 608-737, Republic of Korea |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2019 |
| المجموعة: | King Abdullah University of Science and Technology: KAUST Repository |
| مصطلحات موضوعية: | Lifted flame, Oscillation, Positive buoyancy, Negative buoyancy |
| الوصف: | The oscillating lifted flame in a laminar nonpremixed nitrogen-diluted fuel jet is known to be a result of buoyancy, though the detailed physical mechanism of the initiation has not yet been properly addressed. We designed a systematic experiment to test the hypothesis that the oscillation is driven by competition between the positive buoyancy of flame and the negative buoyancy of a fuel stream heavier than the ambient air. The positive buoyancy was examined with various flame temperatures by changing fuel mole fraction, and the negative buoyancy was investigated with various fuel densities. The density of the coflow was also varied within a certain range by adding either helium or carbon dioxide to air, to study how it affected the positive and negative buoyancies at the same time. As a result, we found that the range of oscillation was well-correlated with the positive and the negative buoyancies; the former stabilized the oscillation while the latter triggered instability and became a source of the oscillation. Further measurements of the flow fields and OH radicals evidenced the important role of the negative buoyancy on the oscillation, detailing a periodic variation in the unburned flow velocity that affected the displacement of the flame. ; The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) under award number BAS/1/1384-01-01. KHV and JP were supported by the project of Development of the Technology of Energy from KETEP in 2017–2018. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| تدمد: | 1540-7489 |
| Relation: | https://www.sciencedirect.com/science/article/pii/S154074891830470X; Van KH, Park J, Yoon SH, Chung SH, Cha MS (2018) Mechanism on oscillating lifted flames in nonpremixed laminar coflow jets. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2018.07.052.; Proceedings of the Combustion Institute; http://hdl.handle.net/10754/628289 |
| DOI: | 10.1016/j.proci.2018.07.052 |
| الاتاحة: | http://hdl.handle.net/10754/628289 https://doi.org/10.1016/j.proci.2018.07.052 |
| Rights: | NOTICE: this is the author’s version of a work that was accepted for publication in Proceedings of the Combustion Institute. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Proceedings of the Combustion Institute, [, , (2018-07-26)] DOI:10.1016/j.proci.2018.07.052 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| رقم الانضمام: | edsbas.53E1A4CE |
| قاعدة البيانات: | BASE |
| تدمد: | 15407489 |
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| DOI: | 10.1016/j.proci.2018.07.052 |