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Determination of the effects of heating mechanisms and moisture content on ignition of live fuels

Author(s): David R. Weise, Thomas H. Fletcher, Shankar M. Mahalingam, Sara S. McAllister, Babak Shotorban, William Matt Jolly
Year Published: 2016
Description:

Effect of moisture content and heat flux type on ignition of foliage from 10 live fuels was examined over the course of a year using two apparatuses: a flat-flame burner coupled with a radiant panel and a Forced Ignition and flame Spread Test (FIST) apparatus. Results of the experiments were compared to predictions made with the GPyro/FDS coupled models. A radiant heat flux of 50 kW/m2 was not sufficient to cause spontaneous ignition of the live samples. A pilot ignition or additional convective heating was needed for successful ignition. The dead fuel ignition model using fuel moisture did not work well in these fuels. Detailed 3D modeling of a live fuel particle showed that the fuel contained significant water at ignition which agreed with experimental data. Live fuel particles such as leaves and needles cannot be viewed as thermally-thin fuels.

Citation: Weise, David R.; Fletcher, Thomas H.; Mahalingam, Shankar M.; McAllister, Sara S.; Shotorban, Babak; Jolly, W. Matt. 2016. Determination of the effects of heating mechanisms and moisture content on ignition of live fuels - Final Report to the Joint Fire Science Program. JFSP Project No. 11-1-4-19. Riverside, CA: US Forest Service, Pacific Southwest Research Station. 26 p.
Topic(s): Fire Behavior, Fire Effects, Ecological - First Order
Ecosystem(s): None
Document Type: Technical Report or White Paper
NRFSN number: 15576
FRAMES RCS number: 21910
Record updated: Jun 14, 2018