Results 221 to 230 of about 3,233 (259)
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On the burning velocity of stretched flames
Combustion and Flame, 1991Abstract The term “burning velocity” is commonly defined as the velocity of the gas ahead of and relative to the flame. This definition is appropriate for a one-dimensional flow because the mass flow rate across the flame is constant. In more general circumstances, however, this definition becomes ambiguous because the mass flow rate varies with ...
J.H. Tien, M. Matalon
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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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An invariant derivation of flame stretch
Combustion and Flame, 1984The flame stretch factor is derived using an invariant formulation in a consistent manner. The derived generalized expression has two terms and completely describes the flame area evolution with its movement. One term represents the stretch due to the nonuniform tangential velocity field and the other represents the effect of the curvature of the ...
S.H. Chung, C.K. Law
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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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Flame/stretch interactions in laminar and turbulent premixed flames
Combustion Science and Technology, 2002The flame/stretch interactions of laminar and turbulent premixed flames are considered both experimentally and computationally. Potentially strong effects of flame/stretch interactions due to preferential-diffusion phenomena within practical turbulent premixed flames were suggested by experiments and numerical simulations of spherical outwardly ...
Aung, KT +5 more
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Burning velocity of stretched flames
2008Application d'un modele superficiel de flammes.
Tadao Takeno +2 more
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Flame stretch analysis in diffusion flames with inert gas
Journal of Thermal Science, 2001Experimental investigations of impinging flame with fuel mixed with non-reaction gas were conducted. According to the observations of combustion test and temperature measurement, the non-reaction gas might dilute the local concentration of fuel in the diffusion process. The shape of the flame was symmetrical due to the flame stretch force. Results show
Ay Su, Ying-Chieh Liu
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Stretched spherical cap flames
Combustion and Flame, 1986Abstract Convex spherical cap flames with negative flame stretch and concave spherical cap flames with positive flame stretch are analyzed using activation energy asymptotics. A minimum flame radius is calculated for concave flames and this results is favorably compared with experimental data on quenching diameters.
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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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