Experimental investigation of processes of typical forest fuel ignition by a high-temperature steel particle

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1 Citation (Scopus)

Abstract

In spite of the fact that the processes of forest fuel ignition is a determinative stage of a fire, there are just a few published works representing experimental data that describe the laws of ignition of various forest fuels influenced by high-temperature small-size sources. Experiments were performed according to the classical plan with randomization because the mathematical model describing the dependence of the delay time of forest fuel ignition on the initial temperature of a local heating source has not been defined till now. Experiments were carried out with a group of graphite particles identical in size, as well as with birch leafs gathered in 2012, dried up, and cleared of foreign impurities. Experiments were carried out with forest fuel samples represented by 5-6 leaves joined together or a group of several tens of needles. The packaging of the forest fuel was equable. Visual observation of forest fuel ignition processes and video images allowed us to formulate a physical model of forest fuel ignition with heating by a small-size particle. The flame torch was formed around the entire perimeter of the particle in the majority of observations. Sometimes the volumetric flame torch over the entire surface of the particle arose in a split second. The approximation dependence of the ignition delay time on the initial temperature of the particle is a linear function and differs substantially from typical curves for solid fuels. This difference is connected with the significant structural heterogeneity of a forest fuel element heated up by a local source and conditions of heat sink in the heating zone.

Original languageEnglish
Pages (from-to)681-689
Number of pages9
JournalHeat Transfer Research
Volume47
Issue number7
DOIs
Publication statusPublished - 2016

Fingerprint

Steel
ignition
Ignition
steels
Temperature
torches
Heating
leaves
heating
flames
Time delay
time lag
nuclear fuel elements
visual observation
Graphite
Experiments
heat sinks
Heat sinks
packaging
needles

Keywords

  • Experimental investigation
  • Forest fuel
  • Heated particle
  • Ignition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "In spite of the fact that the processes of forest fuel ignition is a determinative stage of a fire, there are just a few published works representing experimental data that describe the laws of ignition of various forest fuels influenced by high-temperature small-size sources. Experiments were performed according to the classical plan with randomization because the mathematical model describing the dependence of the delay time of forest fuel ignition on the initial temperature of a local heating source has not been defined till now. Experiments were carried out with a group of graphite particles identical in size, as well as with birch leafs gathered in 2012, dried up, and cleared of foreign impurities. Experiments were carried out with forest fuel samples represented by 5-6 leaves joined together or a group of several tens of needles. The packaging of the forest fuel was equable. Visual observation of forest fuel ignition processes and video images allowed us to formulate a physical model of forest fuel ignition with heating by a small-size particle. The flame torch was formed around the entire perimeter of the particle in the majority of observations. Sometimes the volumetric flame torch over the entire surface of the particle arose in a split second. The approximation dependence of the ignition delay time on the initial temperature of the particle is a linear function and differs substantially from typical curves for solid fuels. This difference is connected with the significant structural heterogeneity of a forest fuel element heated up by a local source and conditions of heat sink in the heating zone.",
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