Results 271 to 280 of about 3,631 (286)
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Stretch and Curvature Effects on Flames
42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004To understand how curvature affects the properties of stretched premixed flames including flame temperature, flame speed, and extinction, comparisons among the tubular premixed flame, the opposed jet flame and the one-dimensional planar flame are drawn physically, experimentally and numerically.
Peiyong Wang +3 more
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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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Contribution of curvature to flame-stretch effects on premixed flames
Combustion and Flame, 2001Abstract This experimental investigation considers steady two-dimensional rich and lean premixed methane–air flames established in two configurations, one a two-dimensional slot burner and the other an axisymmetric coannular burner. The flames contain a curved premixed reaction zone that has a tip.
Chun W. Choi, Ishwar K. Puri
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Combustion and Flame, 2003
Local propagation speeds and stretch rates were measured along a premixed flame that undergoes unsteady wrinkling in order to see if these two quantities correlate in the manner that is predicted by the theory of flame stretch. The Markstein number, which relates these two quantities, also was measured.
Jose O. Sinibaldi +4 more
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Local propagation speeds and stretch rates were measured along a premixed flame that undergoes unsteady wrinkling in order to see if these two quantities correlate in the manner that is predicted by the theory of flame stretch. The Markstein number, which relates these two quantities, also was measured.
Jose O. Sinibaldi +4 more
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Curved and stretched flames: the two Markstein numbers
Journal of Fluid Mechanics, 2011AbstractThe analytical result concerning the Markstein number of adiabatic flames was obtained in 1982 with the one-step Arrhenius model in the limit of a large activation energy. This result is not relevant for real flames. The form of the law expressing the flame velocity in terms of the total stretch rate of the flame front through a single ...
Clavin, Paul, Grana-Otero, Jose
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Flame Stretch and the Balance Equation for the Flame Area
Combustion Science and Technology, 1990Abstract When a flame propagates in a nonuniform flow it experiences strain and curvature effects. The fractional rate of change of the flame area constitutes the flame stretch. This quantity is often used to describe the structure and extinction mechanisms of turbulent flames. It also occurs in many recent studies of premixed laminar flames.
SEBASTIEN M. CANDEL, THIERRY J. POINSOT
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Local flame propagation speeds along wrinkled, unsteady, stretched premixed flames
Symposium (International) on Combustion, 1998The local displacement speed was measured along a premixed flame that is wrinkled, unsteady, stretched, and freely propagating. The displacement speed is argued to be the most important and sensitive parameter that must be simulated correctly in numerical simulations of turbulent flames.
Jose O. Sinibaldi +2 more
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Extinction and flame bifurcations of stretched dimethyl ether premixed flames
Proceedings of the Combustion Institute, 2005Abstract Extinction limits and flame bifurcation of lean premixed dimethyl ether–air flames are numerically investigated using the counterflow flame with a reduced chemistry. Emphasis is paid to the combined effect of radiation and flame stretch on the extinction and flammability limits.
Yiguang Ju, Yuan Xue
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The stability of weakly stretched flames
2008In this study, the stability of plane stretched flames, more specifically plane flames in straining fields, has been examined. It is shown that flame stretch stabilizes long wavelength disturbances and so can suppress, in this regime the hydrodynamic instability.
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