Combustion 06
Combustion 06 : A chemical oxidation-type process in which heat is produced (i.e. a substance is combined with oxygen). In the case of forest fires , living and dead fuels are converted to mainly carbon dioxide and water vapour, and heat energy is released very rapidly. Flaming combustion is characterized by the movement of a visible flame through the fuel bed. On the other hand, smouldering or glowing combustion is generally associated with the residual burning of forest fuels following flaming combustion. Combustion actually consists of three more or less distinct but overlapping phases: Preheating Phase: Unburned fuel is raised to its ignition temperature and gaseous vapours begin to evolve. Distillation or Gaseous Phase: The flammable gases escaping from the fuel surface are ignited in the presence of oxygen. Energy in the form of heat and light is produced. Charcoal or Solid Phase: The presence of combustible vapours above the fuel is too low to support a persistent flame. The residual solid fuel or char burns away slowly
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