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Transport and combustion of Ponderosa Pine firebrands from isolated burning trees

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4 Author(s)
Nicolas Sardoy ; Polytech'Marseille, Dept. of Mechanical Engineering, CNRS UMR 6595, Technopôle Château-Gombert, 5 rue Enrico Fermi, 13453 Marseille, FRANCE. ; Jean-Louis Consalvi ; Bernard Porterie ; Ahmed Kaiss

A numerical model is developed to describe the transport and the combustion of firebrands lofted by a fire's buoyant plumes. A preliminary study of the thermal degradation and combustion of woody fuel particle is presented. The comparison with lab-scale experiments on cylinder-shaped limbwood samples of Ponderosa Pine (PP) shows a fairly good agreement. A three-dimensional physics-based is used to predict the steady-state flow and thermal fields induced by a crown fire. Trajectories and burning rates of disk-shaped firebrands lofted by the fire plume, and transported downwind are determined for a fire intensity of 20MW/m and various windspeeds from 10 to 20mi/h. Firebrands of different sizes and densities are launched from a specified location at the top of canopy. Results show that the spotting distance depends to the product rhowood0 timestau (rhowood0 : initial wood density, tau : thickness), and varies almost linearly with wind speed while it is independent of the initial particle diameter.

Published in:

2006 First International Symposium on Environment Identities and Mediterranean Area

Date of Conference:

9-12 July 2006