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Dissertation/Thesis Abstract

The Structure of the Blue Whirl: A Soot-Free Reacting Vortex Phenomenon
by Hariharan, Sriram Bharath, M.S., University of Maryland, College Park, 2017, 101; 10273308
Abstract (Summary)

Recent experiments have led to the discovery of the blue whirl, a small, stable flame that evolves from a fire whirl, and burns typically sooty hydrocarbons without producing soot. The distinct physical structure of the flame is investigated through digital imaging techniques, which suggest that the transition and shape of the flame may be influenced by vortex breakdown. The thermal structure of the blue whirl reveals a peak temperature around 2000 K, and that most of the combustion occurs in a relatively small, visibly bright vortex ring. The formation of the flame is shown to occur over a variety of surfaces, including water and flat metal, all of which indicate that the formation of the blue whirl is strongly influenced by the flow structure over the incoming boundary layer. Finally, a schematic structure of the blue whirl is proposed, based on the measurements presented here and previous literature on fire whirls and vortex breakdown.

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Indexing (document details)
Advisor: Gollner, Michael J., Oran, Elaine S.
Commitee: Gollner, Michael J., Oran, Elaine S., Sunderland, Peter B.
School: University of Maryland, College Park
Department: Mechanical Engineering
School Location: United States -- Maryland
Source: MAI 56/05M(E), Masters Abstracts International
Subjects: Engineering, Mechanical engineering, Energy
Keywords: Chemiluminescence, Combustion, Fire whirl, Fluid dynamics, Thin-filament pyrometry, Vortex breakdown
Publication Number: 10273308
ISBN: 978-0-355-06337-0
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