Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube

Dubey, Ajit Kumar; Koyama, Yoichiro; Hashimoto, Nozomu; Fujita, Osamu

Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube

Dubey, Ajit Kumar; Koyama, Yoichiro; Hashimoto, Nozomu et al.

Combustion and flame, 2021, 228, 277-291

Permalink : https://hdl.handle.net/2115/88097

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/88097
タイトル	Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube
著者	Dubey, Ajit Kumar ; Koyama, Yoichiro ; Hashimoto, Nozomu ; Fujita, Osamu
著者名 Dubey, Ajit Kumar
著者名 Koyama, Yoichiro
e-Rad_Researcher 70392751 著者名 Hashimoto, Nozomu
e-Rad_Researcher 10183930 著者名 Fujita, Osamu
言語	英語
キーワード	Mesoscale combustion
	Pulsating instability
	Combustion tube
	Beating instability
	Parametric instability
発行日	2021-06
出版者	Elsevier
収録物名	Combustion and flame
巻(号)	228
ページ	277-291
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© <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/
PISSN	0010-2180
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.combustflame.2021.02.006