Extinguishing the dripping flame by acoustic wave

Xiong, Caiyi; Liu, Yanhui; Xu, Cangsu; Huang, Xinyan

doi:10.1016/j.firesaf.2020.103109

Cited by 18 publications

(7 citation statements)

References 23 publications

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“…More importantly, there was no tubular sound amplifier or sidewall nearby the speaker to concentrate the sound wave, different from past studies 6 – 9 . Thus, the sound field around flame was almost homogeneous, as quantified previously 14 , 15 and seen in Figs. 1 b–c.…”

Section: Experimental Methodssupporting

confidence: 76%

“…Table 2 summarized the measured the critical local sound pressure ( in Pa) for flame extinction as a function of sound frequency from the literature 6 – 9 , 14 , 15 . The flame-related parameters like the flame type, height, heat release rate (HRR), and Froude number were also listed.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the extinguishing excellence of the low-frequency sound 14 , a frequency band varying from 50 to 70 Hz was selected. This frequency was slightly higher than the band from 30 to 50 Hz used in other experiments 7 , 8 , where their sound fields were all amplified by a cylindrical tube.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Our recent works used a loudspeaker and low-frequency acoustic waves (without tube between speaker and flame) to extinguish the stationary candle flame 14 , the moving flames in plastic drips 14 , 24 , and the flaming firebrand 15 . By converting the sound pressure into a velocity component, a characteristic Damköhler (Da) number was introduced as an indicator for the acoustic extinction limit.…”

Section: Introductionmentioning

confidence: 99%

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

Xiong

Liu

Fan

et al. 2021

Sci Rep

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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.

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Section: Experimental Methodssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Xiong

Liu

Fan

et al. 2021

Sci Rep

Self Cite

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“…[49] The perspective of using the acoustic method and acoustic fire extinguishers are noted, but they emphasize the need for further research both in the frequency range and in specifying the technical characteristics of the device. In the work [50] the possibility of the influence of acoustic effects on a moving flame is researched, in particular, for extinguishing dripping of molten fuels. It is shown that the approach is effective at the initial stages, and with an increase in the dripping rate, the efficiency of extinguishing the flame by an acoustic wave decreases.…”

Section: Review Of Up-to-date Approaches For Extinguishing Oil and Petroleum Products Using Acoustic Effectmentioning

confidence: 99%

Review of up-to-date approaches for extinguishing oil and petroleum products

Shevchenko¹,

Strelets²,

Loboichenko³

et al. 2021

SOCAR Proceedings

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The paper provides a review of up-to-date approaches for extinguishing oil and petroleum products. The variability of extinguishing methods and fire extinguishing agents is noted. Fire extinguishing agents used in extinguishing petroleum products are considered in more detailed way, and their environmental characteristics are discussed. The ambiguity of using various foams for extinguishing the fire is shown. A new method for extinguishing oil and petroleum products, based on the acoustic effect, and the capabilities of acoustic fire extinguishers for preventing and eliminating the combustible hydrocarbon fires, and their identification are analyzed. The further development of known approaches and the simultaneous emergence of innovative methods for extinguishing oil and petroleum products are shown. Keywords: oil; petroleum products; extinguishing agent; environmental characteristics; extinguishing foam; acoustic method.

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Numerical Modeling of Flame Shedding and Extinction behind a Falling Thermoplastic Drip

Xiong

Huang

2021

Flow Turbulence Combust

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Extinguishing the dripping flame by acoustic wave

Cited by 18 publications

References 23 publications

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

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

Review of up-to-date approaches for extinguishing oil and petroleum products

Numerical Modeling of Flame Shedding and Extinction behind a Falling Thermoplastic Drip

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