A methodology for the estimation of ignition delay times in forest fire modelling

Reszka, Pedro; Borowiec, P.; Steinhaus, Thomas; Torero, José L.

doi:10.1016/j.combustflame.2012.08.004

Cited by 52 publications

(36 citation statements)

References 17 publications

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“…The FPA has been previously used to study ignition of natural fuels such as peat (Hadden et al 2013) and pine needles (Schemel et al 2008). Ignition by exposure to non-constant heat fluxes has previously been studied by Reszka et al (2012) for application to polymeric materials.…”

Section: State-of-the-art Fire Propagation Experimentsmentioning

confidence: 99%

An experimental assessment of the ignition of forest fuels by the thermal pulse generated by the Cretaceous–Palaeogene impact at Chicxulub

Belcher

Hadden

Rein

et al. 2015

JGS

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Abstract:A large extraterrestrial body hit the Yucatán Peninsula at the end of the Cretaceous period. Models suggest that a substantial amount of thermal radiation was delivered to the Earth's surface by the impact, leading to the suggestion that it was capable of igniting extensive wildfires and contributed to the end-Cretaceous extinctions. We have reproduced in the laboratory the most intense impact-induced heat fluxes estimated to have reached different points on the Earth's surface using a fire propagation apparatus and investigated the ignition potential of forest fuels. The experiments indicate that dry litter can ignite, but live fuels typically do not, suggesting that any ignition caused by impact-induced thermal radiation would have been strongly regional dependent. The intense, but short-lived, pulse downrange and at proximal and intermediate distances from the impact is insufficient to ignite live fuel. However, the less intense but longer-lasting thermal pulse at distal locations may have ignited areas of live fuels. Because plants and ecosystems are generally resistant to single localized fire events, we conclude that any fires ignited by impact-induced thermal radiation cannot be directly responsible for plant extinctions, implying that heat stress is only part of the end-Cretaceous story.

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Section: State-of-the-art Fire Propagation Experimentsmentioning

confidence: 99%

An experimental assessment of the ignition of forest fuels by the thermal pulse generated by the Cretaceous–Palaeogene impact at Chicxulub

Belcher

Hadden

Rein

et al. 2015

JGS

View full text Add to dashboard Cite

show abstract

“…This section recalls the work of [1,2,3,4,11], using a particular formalism which provides a simple expression for the target temperature response to a Fourier decomposition of the incoming heat flux, and suggesting a slight difference for low thermal inertia solids. Indeed, the study of [11] considers series expansion around t → ∞ whereas this study considers a higher series expansion (in comparison with the high thermal inertia case) around t → 0.…”

Section: Mathematical Formulation: the Classical Ignition Theorymentioning

confidence: 99%

“…For high thermal inertia solids, the associated surface heat loss can be neglected as shown in [4,11] whereas it is taken into account for low thermal inertia solids. Hence, kernel K is provided by the classical solution suggested in [2,11] for high thermal inertia solids.…”

Section: Mathematical Formulation: the Classical Ignition Theorymentioning

confidence: 99%

“…Application of this simplified kernel to a linear time-dependent heat flux does not strictly allow recovering the series expansion result of [4] since the series expansion has been made before calculating the convolution. The solution suggested here is nevertheless more accurate regarding the exact solution than the solution proposed in [4] which has been experimentally validated, thus validating the simplified kernel. Indeed, in most practical cases, the ignition time is lower than the kernel characteristic time and the series expansion provides an efficient approximation.…”

Section: Mathematical Formulation: the Classical Ignition Theorymentioning

confidence: 99%

“…Ignition is thus modeled as a one-dimensional heat conduction problem as proposed by [2] for thermally thick surfaces and as a zerodimension heat transfer problem for thermally thin particles as suggested in [3]. In order to mimic more realistic fire scenarios, an improvement of this theory is proposed in [4], where the radiant heat flux is suggested to be linearly time depending, as suggested by [5] to take into account the time-varying heat flux on a stationary target exposed to a spreading fire front. Using this approach, the global trend of the incoming radiant heat flux can be taken into account.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantification of ignition time uncertainty based on the classical ignition theory and Fourier analysis

Lamorlette

2014

Comptes Rendus. Mécanique

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International audienceThis study aims at modeling the effect of incoming heat flux fluctuations, on solid material ignition. In order to propose a general methodology based on the classical ignition theory that can be applied to any kind of solid target, kernels accounting for the target temperature response regarding an incoming heat flux are considered for thermally thick and thin solids with low or high thermal inertia. A Fourier decomposition of the incoming heat flux is then used to calculate the target response to harmonic heat fluxes. Finally, effects of harmonic fluctuations on ignition are discussed based on the previous analytical results, allowing to discriminate situations where ignition time is expected to be rather predictable from situations where ignition time is expected to be less predictable thanks to an uncertainty quantification of the ignition time. To cite this article: Aymeric Lamorlette, C. R. Mecanique 333 (2005)

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Review of Pathways for Building Fire Spread in the Wildland Urban Interface Part I: Exposure Conditions

et al. 2016

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A methodology for the estimation of ignition delay times in forest fire modelling

Cited by 52 publications

References 17 publications

An experimental assessment of the ignition of forest fuels by the thermal pulse generated by the Cretaceous–Palaeogene impact at Chicxulub

An experimental assessment of the ignition of forest fuels by the thermal pulse generated by the Cretaceous–Palaeogene impact at Chicxulub

Quantification of ignition time uncertainty based on the classical ignition theory and Fourier analysis

Review of Pathways for Building Fire Spread in the Wildland Urban Interface Part I: Exposure Conditions

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