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Influence of Vegetation Moisture on Combustion of Pyrolysis Gases in Wildland Fires

[+] Author Affiliations
Selina C. Dover, Ambarish R. Dahale, Babak Shotorban, Shankar Mahalingam

The University of Alabama in Huntsville, Huntsville, AL

David R. Weise

Pacific Southwest Research Station, USDA Forest Service, Riverside, CA

Paper No. IMECE2011-62082, pp. 1491-1497; 7 pages
doi:10.1115/IMECE2011-62082
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 4: Energy Systems Analysis, Thermodynamics and Sustainability; Combustion Science and Engineering; Nanoengineering for Energy, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5490-7
  • Copyright © 2011 by ASME

abstract

Since wildland fires occur in living vegetation, the fuel moisture content must be considered in order to correctly predict the behavior of the fire. One facet of combustion of pyrolysis gases that has not been considered in previous research is the effect of moisture on the combustion process. This effect is investigated by using CHEMKIN software to study an opposed diffusion flame model for three pyrolysis fuels relevant to wildfires. The effect of moisture on flame structure is investigated by varying the mole fraction of water vapor in the fuels, with air as oxidizer. In all cases, the flame extinguishes when the water mole fraction is between 0.55 and 0.65. O2 and H are the only components that exhibit a significant change in concentration under these conditions.

Copyright © 2011 by ASME
Topics: Combustion , Gases , Fire , Pyrolysis

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