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Swirling Flame Dynamics and Describing Function
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010The present article focuses on the dynamics and response of lean premixed confined swirling flames submitted to plane acoustic perturbations. The axial velocity disturbances and the heat release rate are recorded to determine the flame transfer function.
Paliès, P. +3 more
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Non-Normality and Internal Flame Dynamics in Premixed Flame-Acoustic Interaction
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010This paper investigates the non-normal nature of premixed flame–acoustic interaction. The thermoacoustic system is modelled using the acoustic equations for momentum and energy, together with the equation for the evolution of the flame front obtained from the kinematicG-equation.
SUBRAMANIAN, PRIYA, SUJITH, RI
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Dynamics of Flame Lift-Off in Biogas Swirl Flames
51st AIAA/SAE/ASEE Joint Propulsion Conference, 2015Lift-off limits and mechanism of biogas swirl flames were investigated in a gas turbine model combustor using high-repetition-rate OH* chemiluminescence and simultaneous particle image velocimetry (PIV) and OH planar laser induced fluorescence (PLIF). The biogas fuel was represented by 60% methane and 40% carbon dioxide, volumetrically. The test matrix
Qiang An +2 more
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Symposium (International) on Combustion, 1989
Recent advances in the understanding of the structure, propagation, and extinction of laminar flames under the influence of stretch, as manifested by the existence of flame curvature, flow nonuniformity, and flame motion, are reviewed. The emphasis is on premixed flames because of the richness and subtlety of the phenomena involved.
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Recent advances in the understanding of the structure, propagation, and extinction of laminar flames under the influence of stretch, as manifested by the existence of flame curvature, flow nonuniformity, and flame motion, are reviewed. The emphasis is on premixed flames because of the richness and subtlety of the phenomena involved.
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Dynamics in a Rod Model of Solid Flame Waves
SIAM Journal on Applied Mathematics, 2004Summary: We consider gasless solid fuel combustion in a cylinder of radius \(\tilde{R}\), associated with the SHS (self-propagating high-temperature synthesis) process, which employs combustion waves to synthesize materials. A powder mixture of reactants is cold pressed into a sample, typically a cylinder, and ignited at one end.
J. H. Park +2 more
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Characterization of Dynamics in a Premixed Flame
2020The dynamics of a lean premixed flame is investigated using LES. The instantaneous fields show a V-shaped preheat zone while POD results exhibit the dominant single and double helix structures, which contribute to the rotational motion.
Y. Shen, N. Jaouen, C. Duwig
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The Journal of Chemical Physics, 1973
The kinetics of the CS2–O2 flame for laser applications is described by a computer program (utilizing 24 contributing reactions) allowing vibrationally excited CO to be created from CS + O. The validity of individual contributing rate coefficients has been established through a comparison with experimental evidence on the oxidation of CS2. [K.
David W. Howgate, T. A. Barr
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The kinetics of the CS2–O2 flame for laser applications is described by a computer program (utilizing 24 contributing reactions) allowing vibrationally excited CO to be created from CS + O. The validity of individual contributing rate coefficients has been established through a comparison with experimental evidence on the oxidation of CS2. [K.
David W. Howgate, T. A. Barr
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1984
Let us consider the motion of flame fronts in flows that can be unsteady and non-uniform. When the length and time scales of the initial flow are larger than those associated with the planar flame (the flame thickness d and the transit time d/uo where uo is the laminar flame speed), the flame front can be considered, in first approximation, as a ...
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Let us consider the motion of flame fronts in flows that can be unsteady and non-uniform. When the length and time scales of the initial flow are larger than those associated with the planar flame (the flame thickness d and the transit time d/uo where uo is the laminar flame speed), the flame front can be considered, in first approximation, as a ...
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Analyzing the dynamics of cellular flames
Physica D: Nonlinear Phenomena, 1996Abstract Video data from experiments on the dynamics of two-dimensional flames are analyzed. The Karhumen-Loeve (KL) analysis is used to identify the dominant spatial structures and their temporal evolution fot several dynamical regimes of the flames. A data analysis procedure to extract and process the boundaries of flame cells is described.
Antonio Palacios +3 more
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Dynamical Aspects of Pulsed Flames
Combustion Science and Technology, 1996Abstract A one-dimensional model for the so-called pulsed flames, which are employed for molecular detection and in some combustion related measurements, is formulated and studied numerically. It is shown that the pulsed flame is in fact a highly nonlinear realization of the classical oscillatory instability of the anchored flame.
I. BRAILOVSKY +2 more
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