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Flame Leading Edge and Flow Dynamics in a Swirling, Lifted Flame
Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2012Flames in high swirl flow fields with vortex breakdown often stabilize aerodynamically in front of interior flow stagnation points. In contrast to shear layer stabilized flames with a nearly fixed, well defined flame attachment point, the leading edge of aerodynamically stabilized flames can move around substantially, due to both the inherent dynamics ...
Michael Malanoski +5 more
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Mechanism of Flame Stabilization in Turbulent, Lifted-Jet Flames
Combustion and Flame, 1998Particle image velocimetry was used to study the velocity field in the stabilization region of lifted, turbulent CH 4 -jet flames over a range of Reynolds numbers from 7000 to 19,500. Measured velocities at the flame base are considerably below the turbulent flame speeds derived from previous studies and show a dependence on the Reynolds number.
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Flame Leading Edge and Flow Dynamics in a Swirling, Lifted Flame
Combustion Science and Technology, 2014Flames in high swirl flow fields with vortex breakdown often stabilize aerodynamically in front of interior flow stagnation points. In contrast to shear layer stabilized flames with a nearly fixed, well-defined flame attachment point, the leading edge of aerodynamically stabilized flames can move around substantially as a result of both the inherent ...
Michael Malanoski +3 more
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On flame holes and local extinction in lifted-jet diffusion flames
Combustion and Flame, 2005This paper reports observations of local extinction events characterized by flame holes in the CH profiles that have been gathered during a simultaneous sequential CH planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) investigation of a lifted methane-air diffusion flame.
K.M. Lyons +3 more
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Flame stabilization using a plasma discharge in a lifted jet flame
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005Stable combustion in a harsh environment, such as lean fuel concentration and/or low temperature conditions, is attractive because of its low emissions. However, such flames suffer from lack of stability. In our research, an AC plasma discharge is applied to a lifted jet flame to increase the stability of the flame. Two types of discharges are utilized
Wookyung Kim, Mark Mungal, Mark Cappelli
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1993
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Experiments were conducted on lifted, turbulent jet diffusion flames. An automated technique using a linear photodiode array was implemented to measure the temporal history of the liftoff height h.
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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Experiments were conducted on lifted, turbulent jet diffusion flames. An automated technique using a linear photodiode array was implemented to measure the temporal history of the liftoff height h.
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Analysis of Stabilization Mechanisms in Lifted Flames
AIP Conference Proceedings, 2009Flame stabilization and the mechanisms that govern the dynamics at the flame base have been subject to numerous studies in recent years. Recent results using a combined Large Eddy Simulation‐Conditional Moment Closure (LES‐CMC) approach to model the turbulent flow field and the turbulence‐chemistry interactions has been successful in predicting flame ...
S. Navarro-Martinez +4 more
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Theory of attached and lifted diffusion flames
Physics of Fluids, 1998Diffusion flame (DF) attachment and liftoff are examined, leading to (1) explanations of the origins of previous, successful empirical correlations; (2) the discovery of multiple lifting regimes. The latter includes a very slow flow regime, a slow-to-moderate flow regime, and a moderate-to-fast flow regime.
Wichman, Indrek S., Ramadan, Bassem
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Lifting criteria of jet diffusion flames
Symposium (International) on Combustion, 1991The lifting mechanisms of methane/air coflow jet diffusion flames have been studied based on the three-component laser-Doppler velocimetry measurement with conditional seeding under near-limit conditions. Three distinct types of flame lifting behaviors were observed, i.e., (1) the lifting according to the flame-base stability mechanism previously ...
Fumiaki Takahashi, W. John Schmoll
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Stabilization of lifted turbulent-jet flames
Combustion and Flame, 1994Abstract Planar imaging measurements of CH, CH4, and temperature are used to evaluate current models for flame stabilization in lifted, turbulent CH4-jet flames. The experimental system consists of two cameras that simultaneously record the instantaneous distributions of species concentration and temperature. Measurements were made in two flames with
R.W. Schefer, M. Namazian, J. Kelly
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