Experimental study of the effect of ambient pressure on oscillating behavior of pool fires

Jian Chen, Wai Cheong Tam, Wei Tang, Chao Zhang, Changhai Li and Shouxiang Lu

Energy, 2020, vol. 203, issue C

Abstract: Pool fires are known to exhibit self-sustained oscillatory behavior, which plays an important role in the understanding of flame and fire spreading. To investigate the effect of ambient pressure on oscillating behavior of pool fires, the ethanol pool fires with diameters from 2 to 10 cm were conducted under a wide range of pressure from 0.6 to 2.5 atm, where different pressure environments were achieved and maintained using a closed high pressure chamber. Based on the momentum conservation equation for the gas movement driven by buoyant force, the Gr number was derived to illustrate the change of flame structure and oscillation frequency. The results show that the Gr number could explain the flame structure changing from laminar to turbulent. The oscillation intensity, which was redefined using the probability contour of the flame, could be related with Grashof. Furthermore, it was noticed that the influence of ambient pressure and gravity on oscillation frequency depends on the different oscillation mechanisms. Based on the one-dimensional movement of vortex along the axis, a theoretical model was proposed to explain the effect of ambient pressure and gravity on frequency, and then the obtained relationship between Strouhal and Grashof was verified by the measured value.

Keywords: Pool fire; Ambient pressure effect; Flame structure; Oscillation frequency (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544220308902
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:203:y:2020:i:c:s0360544220308902

DOI: 10.1016/j.energy.2020.117783

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().