A convective-radiative propagation model for wildland fires

被引:21
|
作者
Balbi, Jacques Henri [1 ]
Chatelon, Francois Joseph [1 ]
Morvan, Dominique [2 ]
Rossi, Jean Louis [1 ]
Marcelli, Thierry [1 ]
Morandini, Frederic [1 ]
机构
[1] Univ Corse, Syst Phys Environm UMR CNRS 6134, Campus Grossetti,BP 52, F-20250 Corte, France
[2] Aix Marseille Univ, Cent Marseille, Ctr Natl Rech Sci, M2P2, F-13451 Marseille, France
关键词
convective flux; fire dynamics; fire spread; heat transfer; model performance; radiative flux; physical model; steady-state model; FUEL MOISTURE-CONTENT; FREE-BURNING FIRES; SURFACE FIRE; FLAME DYNAMICS; FOREST-FIRES; SPREAD RATE; WIND; BEHAVIOR; FRONT; BED;
D O I
10.1071/WF19103
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
The 'Balbi model' is a simplified steady-state physical propagation model for surface fires that considers radiative heat transfer from the surface area of burning fuel particles as well as from the flame body. In this work, a completely new version of this propagation model for wildand fires is proposed. Even if, in the present work, this model is confined to laboratory experiments, its purpose is to be used at a larger scale in the field under operational conditions. This model was constructed from a radiative propagation model with the addition of a convective heat transfer term resulting from the impingement of packets of hot reacting gases on unburnt fuel elements located at the base of the flame. The flame inside the fuel bed is seen as the 'fingers of fire' described in the literature. The proposed model is physics-based, faster than real time and fully predictive, which means that model parameters do not change from one experiment to another. The predicted rate of spread is applied to a large set of laboratory experiments (through homogeneous pine needles and excelsior fuel beds) and is compared with the predictions of both a very simple empirical model (Catchpole) and a detailed physical model (FireStar2D).
引用
收藏
页码:723 / 738
页数:16
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