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Dissertation/Thesis Abstract

Numerical Simulation of the Blue Whirl: A Reacting Vortex Breakdown Phenomenon
by Chung, Joseph Dongil, Ph.D., University of Maryland, College Park, 2020, 153; 27672592
Abstract (Summary)

The blue whirl is a small, stable, spinning blue flame that evolved spontaneously in recent laboratory experiments while studying turbulent, sooty fire whirls. It burns a range of different liquid hydrocarbon fuels cleanly with no soot production, presenting a new potential way for low-emission combustion. This thesis uses numerical simulations to present, for the first time, the flame and flow structure of the blue whirl. These simulations show that the blue whirl is composed of three different flames—a diffusion flame and a premixed rich and lean flame—all of which meet in a fourth structure, a triple flame which appears as a whirling blue ring. The results also show that the flow structure emerges as the result of vortex breakdown, a fluid instability which occurs in swirling flows. This thesis also presents the development and testing of the numerical algorithms used in the simulation of the blue whirl. This work is a critical step forward in understanding how to use this new form of clean combustion.

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Indexing (document details)
Advisor: Oran, Elaine S.
Commitee: Baeder, James D., Gollner, Michael J., Kaplan, Carolyn R., Wereley, Norman M., Yu, Kenneth H.
School: University of Maryland, College Park
Department: Aerospace Engineering
School Location: United States -- Maryland
Source: DAI-B 82/1(E), Dissertation Abstracts International
Subjects: Computational physics, Engineering, Fluid mechanics
Keywords: Blue whirl, Combustion, Computational fluid dynamics, Fire whirl, Reactive vortex breakdown, Triple flame
Publication Number: 27672592
ISBN: 9798662465268
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