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Numerical study of curvature effects on flame quenching
1989The problem of inward propagating spherical premixed flames is studied numerically. It is shown that at Lewis number exceeding unity the burning rate and the flame speed gradually increase as the spherical flame approaches its center. At small Lewis numbers the picture is quite the opposite.
G. Fernandez +2 more
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Particle volatilization and calibration curvature in flame spectrometry
Analytica Chimica Acta, 1978Abstract Expressions have been derived for the shapes of analytical curves in flame spectrometry under conditions of incomplete volatilization of the sample material in the flame. Particle size distribution has been taken into consideration, as has the variation of flame temperature with observation height.
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Opening of the burke-schumann flame tip and the effects of curvature on diffusion flame extinction
Symposium (International) on Combustion, 1991Effects of flame curvature on diffusion flame extinction have been studied via the model problem of the opening of the Burke-Schumann flame tip. Asymptotic analysis of the flame structure in the tip region shows that increasing the extent of the flame curvature facilitates near-complete reaction and theraby enhances the burning intensity. Consequently,
H.G. Im, C.K. Law, R.L. Axelbaum
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Impact of Hydrogen Addition on Flame Response to Stretch and Curvature
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005We present a formulation of a cylindrical laminar flame stabilized in an axisymmetric stagnation flow. The formulation is described by a one-dimensional set of governing equations incorporating detailed kinetics and transport, including thermal diffusion and Dufour effects.
Raymond Speth +2 more
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Generation of PDFS for flame curvature and for flame stretch rate in premixed turbulent combustion
Combustion and Flame, 2003Abstract Experimentally derived pdfs of turbulent, premixed, flame curvatures from a variety of sources, for a wide range of conditions are surveyed and a suitable expression sought to generalize these. This proves to be one based on the Damkohler number, Da.
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Definition of Burning Velocity and a Geometric Interpretation of the Effects of Flame Curvature
The Physics of Fluids, 1965The burning velocity, v0, has been a subject of controversy for curved flames. This curvature is the macroscopic result of stream tube area variation. The flow can not be one-dimensional, but for small curvatures it is quasi-one-dimensional. As usually defined, v0, varies with curvature due to ducting.
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F145 Numerical Study on Influence of Flame Curvature on Flame Structure in Triple Flame
The Proceedings of the Thermal Engineering Conference, 2015Naoki Hayashi, Yusei Akai, Hayato Segi
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Investigation of partially-premixed propane-air flames with flame curvature
39th Aerospace Sciences Meeting and Exhibit, 2001Joseph Wehrmeyer +5 more
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Measurements of flame-front curvature based on Fourier transformation
Combustion Theory and Modelling, 2007An optimized image processing method for calculating the local curvature of two-dimensional digitized flame-front contours is proposed. This contour-smoothing method is based on Fourier transformation of the entire contour and is different from conventional methods in which a chosen number of neighbouring pixel points is locally fitted to an ad hoc ...
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