Experimental Understanding of Wildland Fires

Simeoni, Albert

doi:10.1002/9781118529539.ch3

Cited by 4 publications

(1 citation statement)

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“…A significant portion of wildfire research considers fire spread as a continuous movement of flame occurring with subsequent ignition of unburned fuel ahead of the fire front (Rothermel 1972;Albini 1985Albini , 1986Dupuy 1995;Catchpole et al 1998;Pastor et al 2006). However, the multi-scale interaction between wind, fire and topography (Simeoni 2013) makes fire spread a dynamic phenomenon that can influence the development of a fire and requires attention for building reliable prediction models. Recent work by Viegas et al (2021) explored the non-continuous nature of fire spread through various experiments.…”

Section: Introductionmentioning

confidence: 99%

Intermittent fireline behaviour over porous vegetative media in different crossflow conditions

Singh

Ziazi

Simeoni

2023

Int. J. Wildland Fire

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Background. Reliable wildfire prediction and efficient controlled burns require a comprehensive understanding of physical mechanisms controlling fire spread behaviour. Earlier studies explored the intermittent nature of free-burning fires, but the influence of flame intermittency on fire spread requires further attention. Aims. This research qualitatively explores dynamic fire behaviour and its influence on fire spread. Methods. Fire spread experiments were conducted under varying wind conditions inside a wind tunnel. Various cameras were used for qualitative analysis, verified against velocity and temperature measurements carried out inside the fuel bed. Key results. Dynamic fire behaviour was observed in the form of near-bed flame pulsations. These pulsations caused fluctuating contact between the flame and unburned fuel ahead of the fire front, leading to point ignitions. Under favourable heat transfer conditions, these point ignitions strengthened and merged with the existing fire front, leading to intermittent flame spread in the form of leaps. Conclusions. The transient nature of flame spread was observed during fire spread experiments conducted under steady external conditions. Implications. This research lays the foundation for critical flow and heat transfer analyses required to characterise intermittent flame spread.

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