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    Author(s): Torben P. GrumstrupSara S. McAllisterMark A. Finney
    Date: 2017
    Source: Presented at the 10th U. S. National Combustion Meeting Organized by the Eastern States Section of the Combustion Institute; April 23-26, 2017; College Park, MD. Pittsburgh, PA: The Combustion Institute. 6 p.
    Publication Series: Abstract
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (395.0 KB)

    Description

    Heating of unburned fuel by attached flames and plume of a wildfire can produce high spread rates that have resulted in firefighter fatalities worldwide. Qualitative flow fields of the plume of a gas burner embedded in a table tilted to 0°, 10°, 20°, and 30° above horizontal were imaged using the retroreflective shadowgraph technique as a means to understand plume attachment and related behavior. Tilting of the plume in the uphill direction for all non-zero slopes was explained by an imbalance in the flow of air entrained into the plume. Reversal in direction of fluid flow uphill from the flame front was shown to occur when buoyancy forces overwhelmed entrainment flow momentum. Flame and plume attachment was explained as being caused by uphill flow of hot combustion gas driven by a combination of buoyancy and an uphill pressure gradient.

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    Citation

    Grumstrup, Torben P.; McAllister, Sara S.; Finney, Mark A. 2017. Qualitative flow visualization of flame attachment on slopes. Presented at the 10th U. S. National Combustion Meeting Organized by the Eastern States Section of the Combustion Institute; April 23-26, 2017; College Park, MD. Pittsburgh, PA: The Combustion Institute. 6 p.

    Keywords

    wildfire, slope, buoyancy, entrainment

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https://www.fs.usda.gov/treesearch/pubs/54927