An improved non-equilibrium model for the ignition of living fuel
A. Lamorlette A C , M. El Houssami B and D. Morvan A
+ Author Affiliations
- Author Affiliations
A Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, France.
B BRE Centre for Fire Safety Engineering, The University of Edinburgh, UK.
C Corresponding author. Email: aymeric.lamorlette@univ-amu.fr
International Journal of Wildland Fire 27(1) 29-41 https://doi.org/10.1071/WF17020
Submitted: 6 February 2017 Accepted: 21 October 2017 Published: 23 January 2018
Abstract
This paper deals with the modelling of living fuel ignition, suggesting that an accurate description using a multiphase formulation requires consideration of a thermal disequilibrium within the vegetation particle, between the solid (wood) and the liquid (sap). A simple model at particle scale is studied to evaluate the flux distribution between phases in order to split the net flux on the particles into the two sub-phases. An analytical solution for the split function is obtained from this model and is implemented in ForestFireFOAM, a computational fluid dynamics (CFD) solver dedicated to vegetation fire simulations, based on FireFOAM. Using this multiphase formulation, simulations are run and compared with existing data on living fuel flammability. The following aspects were considered: fuel surface temperature, ignition, flaming combustion time, mean and peak heat release rate (HRR). Acceptable results were obtained, suggesting that the thermal equilibrium might not be an acceptable assumption to properly model ignition of living fuel.
References
Anand C, Shotorban B, Mahalingam S, McAllister S, Weise DR (2017) Physics-based modeling of live wildland fuel ignition experiments in the forced ignition and flame spread test apparatus. Combustion Science and Technology 189, 1551–1570.| Physics-based modeling of live wildland fuel ignition experiments in the forced ignition and flame spread test apparatus.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2sXotVeksbs%3D&md5=e70fca60dcb8bec5467a3139aa84bab2CAS |
Chaos M (2014) Spectral aspects of bench-scale flammability testing: application to hardwood pyrolysis. Fire Safety. Science 11, 165–178.
| Spectral aspects of bench-scale flammability testing: application to hardwood pyrolysis.Crossref | GoogleScholarGoogle Scholar |
Di Blasi C, Branca C, Santoro A, Hernandez EG (2001) Pyrolytic behaviour and products of some wood varieties. Combustion and Flame 124, 165–177.
| Pyrolytic behaviour and products of some wood varieties.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXnslSjtw%3D%3D&md5=3218eef3946798211c1e83a2e0c058edCAS |
El Houssami M (2016) Development of a numerical and experimental framework to understand and predict the burning dynamics of porous fuel beds. PhD thesis, The University of Edinburgh. Available at https://www.era.lib.ed.ac.uk/handle/1842/23465 [Verified 30 January 2017]
El Houssami M, Thomas JC, Lamorlette A, Morvan D, Chaos M, Hadden R, Simeoni A (2016) Experimental and numerical studies characterizing the burning dynamics of wildland fuels. Combustion and Flame 168, 113–126.
| Experimental and numerical studies characterizing the burning dynamics of wildland fuels.Crossref | GoogleScholarGoogle Scholar |
Grishin AM (1997) ‘A mathematical modelling of forest fires and new methods of fighting them.’ (Publishing House of the Tomsk University: Tomsk, Russia)
Irvine TF, Hartnett JP (1978) ‘Advances in heat transfer’, vol. 4. (Academic Press: New York, NY, USA)
Lamorlette A (2014) Quantification of ignition time uncertainty based on the classical ignition theory and fourier analysis. Comptes Rendus. Mécanique 342, 459–465.
| Quantification of ignition time uncertainty based on the classical ignition theory and fourier analysis.Crossref | GoogleScholarGoogle Scholar |
Lamorlette A, Candelier F (2015) Thermal behavior of solid particles at ignition: theoretical limit between thermally thick and thin solids. International Journal of Heat and Mass Transfer 82, 117–122.
| Thermal behavior of solid particles at ignition: theoretical limit between thermally thick and thin solids.Crossref | GoogleScholarGoogle Scholar |
Larini M, Giroud F, Porterie B, Louraud JC (1998) A multiphase formulation for fire propagation in heterogeneous combustible media. International Journal of Heat and Mass Transfer 41, 881–897.
| A multiphase formulation for fire propagation in heterogeneous combustible media.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1cXlvVansw%3D%3D&md5=730a97cbfcbfb460332694b4260bf014CAS |
Liukov AV (1968) ‘Analytical heat diffusion theory.’ (Academic Press: New York, NY, USA)
McAllister S, Grenfell I, Hadlow A, Jolly WM, Finney M, Cohen J (2012) Piloted ignition of living forest fuels. Fire Safety Journal 51, 133–142.
| Piloted ignition of living forest fuels.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38Xnt1yku7c%3D&md5=4c34e576d670f0d9796d82c1ef8e972dCAS |
Mell W, Maranghides A, McDermott R, Manzelle SL (2009) Numerical simulation and experiments of burning Douglas-fir trees. Combustion and Flame 156, 2023–2041.
| Numerical simulation and experiments of burning Douglas-fir trees.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXhtV2htb3I&md5=70979a3f8bdc1bb69a858ccb2dd321d0CAS |
Morvan D, Dupuy JL (2001) Modelling of fire spread through a forest fuel bed using a multiphase formulation. Combustion and Flame 127, 1981–1994.
| Modelling of fire spread through a forest fuel bed using a multiphase formulation.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXotVyhs7s%3D&md5=33c3856850713c1e5a4067f3777ba819CAS |
Morvan D, Méradji S, Accary G (2009) Physical modelling of fire spread in grasslands. Fire Safety Journal 44, 50–61.
| Physical modelling of fire spread in grasslands.Crossref | GoogleScholarGoogle Scholar |
Nepf HM (1999) Drag, turbulence, and diffusion in flow through emergent vegetation. Water Resources Research 35, 479–489.
| Drag, turbulence, and diffusion in flow through emergent vegetation.Crossref | GoogleScholarGoogle Scholar |
Patankar S (1980) ‘Numerical heat transfer and fluid flow.’ (McGraw-Hill: New York, NY, USA)
Pickett BM, Isackson C, Wunder R, Fletcher TH, Butler BW, Weise DR (2010) Experimental measurements during combustion of moist individual foliage samples. International Journal of Wildland Fire 19, 153–162.
| Experimental measurements during combustion of moist individual foliage samples.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXjvF2msLw%3D&md5=8a25ed1bc0b110b9056c66a331b9d22cCAS |
Ren N, Wang Y, Vilfayeau S, Trouvé A (2016) Large eddy simulation of turbulent vertical wall fires supplied with gaseous fuel through porous burners. Combustion and Flame 169, 194–208.
| Large eddy simulation of turbulent vertical wall fires supplied with gaseous fuel through porous burners.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXitVynur%2FL&md5=480917bf71a19679b07035b0c7fc1cfaCAS |
Schemel CF, Simeoni A, Biteau H, Rivera JD, Torero JL (2008) A calorimetric study of wildland fuels. Experimental Thermal and Fluid Science 32, 1381–1389.
| A calorimetric study of wildland fuels.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXotF2rsrs%3D&md5=9a12fb023f08c362c747ba48fb77f818CAS |
Séro-Guillaume O, Margerit J (2002) Modelling forest fires. Part I: a complete set of equations derived by extended irreversible thermodynamics. International Journal of Heat and Mass Transfer 45, 1705–1722.
| Modelling forest fires. Part I: a complete set of equations derived by extended irreversible thermodynamics.Crossref | GoogleScholarGoogle Scholar |
Shaw RH, Patton EG (2003) Canopy element influences on resolved- and sub-grid-scale energy within a large-eddy simulation. Agricultural and Forest Meteorology 115, 5–17.
| Canopy element influences on resolved- and sub-grid-scale energy within a large-eddy simulation.Crossref | GoogleScholarGoogle Scholar |
Simpson W, TenWolde A (1999) Wood handbook: wood as an engineering material. USDA Forest Service, Forest Products Laboratory. General technical report FPL; GTR-113. (Madison, WI, USA)
Thomas JC (2016) Improving the understanding of fundamental mechanisms that influence ignition and burning behavior of porous wildland fuel beds. PhD thesis, The University of Edinburgh.
Torero JL (2008) ‘SFPE handbook of fire protection engineering’, 5th edn. pp. 633–662. (National Fire Protection Association: New York, NY, USA)
Torero JL, Simeoni A (2010) Heat and mass transfer in fires: scaling laws, ignition of solid fuels and application to forest fires. The Open Thermodynamics Journal 4, 145–155.
| Heat and mass transfer in fires: scaling laws, ignition of solid fuels and application to forest fires.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhsVeqtbzK&md5=86afab11dbdb4cd4a2b99dee05545b48CAS |
