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Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube
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| Title: | Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube |
| Authors: | Dubey, Ajit Kumar Browse this author | | Koyama, Yoichiro Browse this author | | Hashimoto, Nozomu Browse this author →KAKEN DB | | Fujita, Osamu Browse this author →KAKEN DB |
| Keywords: | Mesoscale combustion | | Pulsating instability | | Combustion tube | | Beating instability | | Parametric instability |
| Issue Date: | Jun-2021 |
| Publisher: | Elsevier |
| Journal Title: | Combustion and flame |
| Volume: | 228 |
| Start Page: | 277 |
| End Page: | 291 |
| Publisher DOI: | 10.1016/j.combustflame.2021.02.006 |
| Abstract: | The present work reports thermo-acoustic instability in a mesoscale tube of diameter 8 mm (> quenching diameter) and length 702 mm. Mixtures with Lewis number, Le similar to 0.8 (rich C2H4/O-2/CO2), 1.05 (lean C2H4/O-2/CO2) and 1.34 (lean C2H4/O-2/N-2) are used. Several new flame responses are observed. For lower burning velocity mixtures, flame extinction is observed due to heat loss when primary instability transforms to secondary instability for all Le mixtures. However, parametric cellular structures which are characteristic of parametric instability are observed only for Le of 0.8. It is proposed based on calculations and experiments that parametric structures will be observed only when diameter of tube is two times larger than the characteristic wavelength of parametric instability. If the tube diameter doesn?t allow formation of parametric structure whirling and counter-rotating flames are observed instead of parametric structures. Suppression of acoustic parametric instability is observed for higher burning velocity mixtures with Le > 1 and its mechanism is discussed. For a range of SL, a beating instability is observed for CO2 diluted mixtures of Le > 1, where pressure oscillation and flame motion show beating oscillations of frequency around 15 Hz. This beating instability is believed to be caused by non-linear interaction of acoustic instability with pulsating instability of flame front which is caused due to combined radiative and convective heat loss. Due to CO2 dilution, the radiative heat losses could play a significant role in inducing pulsating instability. |
| Rights: | © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/88097 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 藤田 修
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