Results 271 to 280 of about 61,419 (308)

Stretch rate of tubular premixed flames

Combustion and Flame, 2006
Abstract Following Seshadri and Williams solution describing the flow field for the opposed jet burner, the analytical solution is given for the flow field of two other burners: the opposed tubular burner and the tubular burner. Under plug flow boundary conditions, it is shown that the stretch rate at the stagnation surface of the opposed tubular ...
Peiyong Wang, Joseph A. Wehrmeyer, Robert W. Pitz   +2 more
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Burning velocity of stretched flames

2008
Application d'un modele superficiel de flammes.
Tadao Takeno, Makihito Nishioka, Satoru Ishizuka   +2 more
openaire   +1 more source

On the stability of stretched flames

Combustion Theory and Modelling, 1997
It is shown that the well known difficulty concerning the unconditional stability of a planar flame sustained in a stagnation-point flow is due to the infinite aspect length scale of the system. In finite geometries occurring in numerical and laboratory experiments the flame may well become unstable provided the flow-induced stretch is weak enough.
Y. Kortsarts, I. Brailovsky, S. Gutman, G.I. Sivashinsky   +3 more
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An invariant derivation of flame stretch

Combustion and Flame, 1984
The 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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Stretch and Curvature Effects on Flames

42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004
To 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, Shengteng Hu, Joseph Wehrmeyer, Robert Pitz   +3 more
openaire   +1 more source

On Hydrodynamic Instability of Stretched Flames

Combustion Science and Technology, 1997
Abstract 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, I. Brailovsky, G. I. Sivashinsky   +2 more
openaire   +1 more source

Contribution of curvature to flame-stretch effects on premixed flames

Combustion and Flame, 2001
Abstract 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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Propagation speeds and stretch rates measured along wrinkled flames to assess the theory of flame stretch

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, James F. Driscoll, Charles J. Mueller, Jeffrey M. Donbar, Campbell D. Carter   +4 more
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Curved and stretched flames: the two Markstein numbers

Journal of Fluid Mechanics, 2011
AbstractThe 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
openaire   +2 more sources

Local flame propagation speeds along wrinkled, unsteady, stretched premixed flames

Symposium (International) on Combustion, 1998
The 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, Charles J. Mueller, James F. Driscoll   +2 more
openaire   +1 more source