초록

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Abstract ▼ AI-Helper

In this study, CFD simulation is performed in order to assess about traveling distances of firebrands by wind. Burning embers, commonly called firebrands, are lofted by a fire’s buoyant plume and transported downwind to ignite new fires (spot fires) ahead of the main fire. In the present work, the i...

In this study, CFD simulation is performed in order to assess about traveling distances of firebrands by wind. Burning embers, commonly called firebrands, are lofted by a fire’s buoyant plume and transported downwind to ignite new fires (spot fires) ahead of the main fire. In the present work, the influences of the inflow wind velocity, firebrand diameters, generating site, and initial generating velocity were investigated. A three-dimensional physicsbased model is used to precompute the steady-state gas flow and thermal fields induced by a crown fire into which firebrands will be injected. Then the trajectories and burning rates of cylinder and disk shapes of firebrands lofted by the crown fire plume and transported downwind are calculated for various values of the inflow wind, particle sizes and fire intensity. The landing distances of the firebrand spatial distribution produced from the firebrand generator are presented by comparing in each set-up conditions. It shown that, the comparison between experiment and calculation are good agreement on traveling distances of firebrands.

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