Results 221 to 230 of about 6,867 (259)
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Acoustic Instability in Premixed Flames
Combustion Science and Technology, 1992Abstract This short paper presents an experimental description of the acoustic instability of a premixed flame front propagating in a tube. Four distinct types of behaviour are identified. Firstly a regime of acoustic stability in which the flame is cellular and non vibrating.
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Diffusional/Thermal Instability of a Solid Propellant Flame
SIAM Journal on Applied Mathematics, 1989Summary: The stability of a gas flame attached to a deflagrating solid propellant is investigated through an asymptotic analysis in the limit of large gas- phase activation energy. Since the diffusional/thermal model for solid propellant combustion employed relaxes the usual assumptions of gas-phase quasisteadiness and quasiplanarity, the overall ...
Margolis, Stephen B. +1 more
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Extinction and cellular instability of premixed tubular flames
Proceedings of the Combustion Institute, 2008Extinction and cellular instabilities are investigated in premixed tubular flames. A tubular burner has recently been designed and constructed to be capable of operating under a wide range of conditions that allow more accurate and detailed study of tubular premixed and non-premixed flames.
Yu Wang, Shengteng Hu, Robert Pitz
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Flame-Intrinsic Kelvin−Helmholtz Instability of Flickering Premixed Flames
Energy & Fuels, 2009The flame-intrinsic Kelvin−Helmholtz (KH) instability, a self-oscillation of laminar flame fronts extending to the streamwise direction, was experimentally investigated using inverted conical premixed flames, and the governing parameters of flame flickering were deduced.
Guahk, YT Guahk, Young Tae +3 more
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Gravity effects on triple flames: Flame structure and flow instability
Physics of Fluids, 1999A fundamental difference between a partially premixed flame and an equivalent premixed (or nonpremixed) flame pertains to the existence of multiple synergistically coupled reaction zones. A “triple flame” is a type of partially premixed flame that contains a fuel-rich premixed reaction zone, a fuel-lean premixed reaction zone, and a nonpremixed ...
Riccardo Azzoni +3 more
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Effect of Flame Inherent Instabilities and Turbulence on Flame Structural Characteristics
Journal of Energy Engineering, 2019AbstractTo evaluate the effect of turbulence and inherent instabilities of flame on flame structural characteristics, experiments were conducted with a 70%-H2/30%-CO premixed flame at various equiv...
Yan-Huan Jiang +4 more
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Investigations of diffusion flame instabilities
2003These Ecole polytechnique federale de Lausanne EPFL, n° 2700 (2003)Section de genie mecaniqueFaculte des sciences et techniques de l'ingenieurInstitut des sciences de l'energieJury: Konstantinos Boulouchos, Jacques Giovanola, Philippe Metzener, Peter Monkewitz, Ananias Tomboulides Public defense: 2003-1-24 Reference doi:10.5075/epfl-thesis-2700Print ...
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Instability Control by Premixed Pilot Flames
Volume 3: Combustion, Fuels and Emissions, Parts A and B, 2008Premixed flames of swirl-stabilized combustors (displaced-half-cone) are susceptible to thermo-acoustic instabilities which should be avoided under all operating conditions in order to guarantee a long service life for both stationary and aircraft gas turbines. The source of this unstable flame behavior can e.g.
Peter Albrecht +4 more
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Diffusional-Thermal Instability of Diffusion Flames in the Premixed-Flame Regime
Combustion Science and Technology, 1996Abstract The diffusional-thermal instability of diffusion flames is studied in a constant-density two-dimensional counterflow diffusion flame, to investigate an instability mechanism by which periodic wrinkling of the reaction sheet can occur. Attention is focused on flames with small departures of the Lewis number from unity and with small values of ...
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Comparison of flame-front instabilities with instabilities of ablation fronts in ICF
2005There are both similarities and differences between instabilities of planar laminar flame fronts and ablation fronts in inertial-confinement fusion (ICF). The mathematical formulation of the problem in ICF is the same as for flames propagating upward; the differences stem from the different order of magnitude of the Froude number and thermal ...
Clavin, Paul +2 more
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