Results 211 to 220 of about 6,867 (259)
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On hydrodynamic instability of the flame-wedge
Journal of Engineering Mathematics, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Minaev, S. S., Sivashinsky, G. I.
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Instability of Flame Spread in Microgravity
Heat Transfer: Volume 4, 1999Abstract Results from the first part of an experimental study of flame spread instability are presented. The instabilities were investigated in the NASA drop facilities because the particular instabilities being examined were most pronounced in microgravity, when the influences of buoyancy were minimized.
Lisa M. Oravecz +2 more
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Instability of buoyant diffusion flames
Experiments in Fluids, 1996Buoyant jet diffusion flames are known to exhibit large scale vortical flow structures strongly interacting with flame structures. In the present work, the formation and evolution of coherent flow structures is studied in a methane/ air coflow arrangement.
A. Lingens, M. Reeker, M. Schreiber
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On Hydrodynamic Instability of Stretched Flames
Combustion Science and Technology, 1997Abstract The recent result on the diffusive instability of a planar premixed gas flame sustained in the stagnation-point flow are carried over on the hydrodynamic (Darrieus-Landau) instability. Similar to the former case the planar flame of the infinite aspect length-scale is unconditionally stable for any flow induced stretch however small.
Y. Kortsarts +2 more
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Influence of Flame Front Instability on Flame Propagation Behavior
ASME/JSME 2011 8th Thermal Engineering Joint Conference, 2011This paper discusses flame acceleration due to flame instability mechanisms. In particular, the diffusive-thermal instability and hydrodynamic instability mechanisms are considered. The Sivashinsky equation is used to compute two-dimensional flame propagation behaviors, and the influence of each instability mechanism is separately considered.
Kenji Mukaiyama, Kazunori Kuwana
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Effect of Pilot Flame on Flame Macrostructure and Combustion Instability
Volume 4A: Combustion, Fuels and Emissions, 2017The effect of a pilot flame on the dynamic stability characteristics of a single-nozzle lean-premixed swirl combustor operating on natural gas fuel is investigated. Experiments are performed at a fixed inlet temperature and inlet velocity over a broad range of overall fuel-lean equivalence ratios with varied amounts of pilot fuel. The stability results
Jihang Li +5 more
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Hydrodynamic Instabilities in Flames
1992The strong coupling of a flame to the flow through which it propagates is caused primarily by the thermal expansion of the gas undergoing chemical reaction. This coupling has a prominent effect on the response of a flame to hydrodynamic disturbances.
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Effects of turbulence and flame instability on flame front evolution
Physics of Fluids, 2006The effects of turbulence and flame instabilities on the flame front evolution at Lewis number (Le) 1.0 and 0.7 were computationally investigated using a sixth-order central difference scheme and nonreflective boundary conditions. The turbulence intensity varies from 1% to 50% and the resulting turbulent flames are in the thin wrinkled flame region. It
Jiao Yuan, Yiguang Ju, Chung K. Law
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Swirling Flame Instability Analysis Based on the Flame Describing Function Methodology
Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2010Thermoacoustic instabilities are analyzed by making use of a nonlinear representation of flame dynamics based on the describing function. In this framework, the flame response is determined as a function of frequency and amplitude of perturbations impinging on the combustion region.
Palies, P. +3 more
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Rayleigh–Bénard instability generated by a diffusion flame
Journal of Fluid Mechanics, 2013AbstractWe investigate the Rayleigh–Bénard convection problem within the context of a diffusion flame formed in a horizontal channel where the fuel and oxidizer concentrations are prescribed at the porous walls. This problem seems to have received no attention in the literature.
Pearce, P +1 more
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