Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 37, Issue 3, Pages 4285-4293Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.05.115
Keywords
Fire whirl; Blue whirl; Soot
Funding
- NSF [CBET 1507623, 1554026]
- University of Maryland through Minta Martin Endowment Funds (Department of Aerospace Engineering)
- Glenn L. Martin Institute Chaired Professorship (A. James Clark School of Engineering)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1554026] Funding Source: National Science Foundation
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The blue whirl is a recently discovered regime of the fire whirl that burns without any visible soot, even while burning liquid fuels directly. This flame evolves naturally from a traditional fire whirl in a fixed-frame self-entraining fire whirl experimental setup. Here, detailed thermal measurements of the flame structure performed using thermocouples and thin-filament pyrometry are presented. Thermocouple measurements reveal a peak temperature of similar to 2000 K, and 2-D temperature distributions from pyrometry measurements suggest that most of the combustion occurs in the relatively small, visibly bright, blue vortex ring. Different liquid hydrocarbon fuels such as heptane, iso-octane and cyclohexane consistently formed the blue whirl with similar thermal structures, indicating that blue whirl formation is independent of fuel type, and also that the transition from a fire whirl to a blue whirl may be influenced by vortex breakdown. (C) 2018 The Combustion Institute Published by Elsevier Inc. All rights reserved.
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