Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source

Abstract Acoustic wave can destabilize the flame and has a potential in firefighting, but the influences of the sound source and its frequency are still poorly understood. This work applies a loudspeaker to extinguish a laminar diffusion propane flame of 5–25 mm high, where the local sound frequency...

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Autores principales:	Caiyi Xiong, Yanhui Liu, Haoran Fan, Xinyan Huang, Yuji Nakamura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ee6cd59bdb8c4e7480dfb8d68d637067
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spelling	oai:doaj.org-article:ee6cd59bdb8c4e7480dfb8d68d6370672021-12-02T15:33:14ZFluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source10.1038/s41598-021-93648-02045-2322https://doaj.org/article/ee6cd59bdb8c4e7480dfb8d68d6370672021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93648-0https://doaj.org/toc/2045-2322Abstract Acoustic wave can destabilize the flame and has a potential in firefighting, but the influences of the sound source and its frequency are still poorly understood. This work applies a loudspeaker to extinguish a laminar diffusion propane flame of 5–25 mm high, where the local sound frequency is 50–70 Hz and sound pressure is 0.8–3.2 Pa (92.0–104.1 dB). Results reveal a constant flame pulsating displacement at the extinction limit, independent of the sound environment used. Such a flame pulsating displacement is found to be caused by the motion of the speaker membrane (or diaphragm) and its induced wind, which could be two orders of magnitude larger than the displacement of the air that transmits acoustic wave. Thus, under the influence of sound source, a critical flame strain rate, stretched by the pulsating airflow, can be formulated to characterize the blow-off limit better than the local sound pressure. The sound source with a lower frequency can produce larger pulsating displacements of both membrane and flame, and thus promoting extinction. This work improves the understanding of flame dynamics under the external sound field and source, and it helps establish a scientific framework for acoustic-based fire suppression technologies.Caiyi XiongYanhui LiuHaoran FanXinyan HuangYuji NakamuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Caiyi Xiong Yanhui Liu Haoran Fan Xinyan Huang Yuji Nakamura Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
description	Abstract Acoustic wave can destabilize the flame and has a potential in firefighting, but the influences of the sound source and its frequency are still poorly understood. This work applies a loudspeaker to extinguish a laminar diffusion propane flame of 5–25 mm high, where the local sound frequency is 50–70 Hz and sound pressure is 0.8–3.2 Pa (92.0–104.1 dB). Results reveal a constant flame pulsating displacement at the extinction limit, independent of the sound environment used. Such a flame pulsating displacement is found to be caused by the motion of the speaker membrane (or diaphragm) and its induced wind, which could be two orders of magnitude larger than the displacement of the air that transmits acoustic wave. Thus, under the influence of sound source, a critical flame strain rate, stretched by the pulsating airflow, can be formulated to characterize the blow-off limit better than the local sound pressure. The sound source with a lower frequency can produce larger pulsating displacements of both membrane and flame, and thus promoting extinction. This work improves the understanding of flame dynamics under the external sound field and source, and it helps establish a scientific framework for acoustic-based fire suppression technologies.
format	article
author	Caiyi Xiong Yanhui Liu Haoran Fan Xinyan Huang Yuji Nakamura
author_facet	Caiyi Xiong Yanhui Liu Haoran Fan Xinyan Huang Yuji Nakamura
author_sort	Caiyi Xiong
title	Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
title_short	Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
title_full	Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
title_fullStr	Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
title_full_unstemmed	Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
title_sort	fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ee6cd59bdb8c4e7480dfb8d68d637067
work_keys_str_mv	AT caiyixiong fluctuationandextinctionoflaminardiffusionflameinducedbyexternalacousticwaveandsource AT yanhuiliu fluctuationandextinctionoflaminardiffusionflameinducedbyexternalacousticwaveandsource AT haoranfan fluctuationandextinctionoflaminardiffusionflameinducedbyexternalacousticwaveandsource AT xinyanhuang fluctuationandextinctionoflaminardiffusionflameinducedbyexternalacousticwaveandsource AT yujinakamura fluctuationandextinctionoflaminardiffusionflameinducedbyexternalacousticwaveandsource
_version_	1718387118800109568

Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source

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