Autoignition of Dead Shrub Twigs: Influence of Diameter on Ignition

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• 作者：Virginie Tihay-Felicelli ; Paul-Antoine Santoni ; Toussaint Barboni…
• 关键词：Autoignition ; Shrub fuels ; Ignition criterion ; Particle size
• 刊名：Fire Technology
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：52
• 期：3
• 页码：897-929
• 全文大小：1,668 KB
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• 作者单位：Virginie Tihay-Felicelli (1)
  Paul-Antoine Santoni (1)
  Toussaint Barboni (1)
  Lara Leonelli (1)
  
  1. SPE-UMR 6134 CNRS, University of Corsica, Campus Grimaldi, BP 52, 20250, Corte, France
  
• 刊物类别：Engineering
• 刊物主题：Civil Engineering
  Mechanics
  Characterization and Evaluation Materials
  Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-8099

文摘

The effect of the diameter of dead twigs of Cistus monspeliensis on their ignition was studied experimentally and theoretically. Autoignition experiments were carried out in a cone calorimeter. The ignition time, surface temperature before ignition, flame residence time, smoldering time and mass loss were measured. The particles were classified into two groups based on their ignitability. The first group contained the most flammable twigs, which had diameters smaller than or equal to 4 mm, along with leaves. The second one included twigs with diameters equal to or larger than 5 mm. For a radiant heat flux of 50 kW/m2, the 4-mm value appeared to be the upper limit for the size of the particles potentially involved in the spread dynamics of wildfires. However, bark detachment was observed on the thickest twigs, which greatly decreased their ignition time. Two ignition criteria were investigated: the ignition temperature and critical mass flux. The ignition temperature increased with the twig diameter, showing that this quantity should be carefully considered in ignition models. A thermal ignition model was proposed to determine the ignition time of twigs according to their diameter. The critical mass flux appeared to be fairly constant for any fuel diameter and could also be convenient for modeling the ignition of shrub fuels.