Approximations for burning velocities and markstein numbers for lean hydrocarbon and methanol flames

Burning velocities of lean-to-stoichiometric n-heptane-, iso-octane-, and methanol-air mixtures have been numerically calculated over a wide range of pressure and preheat temperatures. The numerical calculations are based on elementary reaction mechanisms comprising a few hundred reactions. They are then approximated using a two-equation analytic expression that has successfully been applied for flames of methane, ethylene, ethane, acetylene, and propane. Markstein numbers are also predicted for all these fuels. The predictions are compared with the few experimental data on Markstein numbers that exist in the literature.

[1]  Elaine S. Oran,et al.  Detailed modelling of combustion systems , 1981 .

[2]  Bernard J. Matkowsky,et al.  Flames as gasdynamic discontinuities , 1982, Journal of Fluid Mechanics.

[3]  B. Rogg,et al.  The asymptotic structure of weakly strained stoichiometric methane-air flames , 1990 .

[4]  Forman A. Williams,et al.  The asymptotic structure of stoichiometric methaneair flames , 1987 .

[5]  Effect of heat losses on the limits of stability of premixed flames propagating downwards , 1985 .

[6]  P. Gaskell,et al.  Burning Velocities, Markstein Lengths, and Flame Quenching for Spherical Methane-Air Flames: A Computational Study , 1996 .

[7]  D. Bradley,et al.  A generalization of laminar burning velocities and volumetric heat release rates , 1991 .

[8]  Norbert Peters,et al.  Transient pressure effects in the evolution equation for premixed flame fronts , 1994 .

[9]  M. Metghalchi,et al.  Burning Velocities of Mixtures of Air with Methanol, Isooctane, and Indolene at High Pressure and Temperature , 1982 .

[10]  Gerard M. Faeth,et al.  Laminar burning velocities and Markstein numbers of hydrocarbonair flames , 1993 .

[11]  B. Deshaies,et al.  The velocity of a premixed flame as a function of the flame stretch: An experimental study , 1990 .

[12]  Geoffrey Searby,et al.  Direct and indirect measurements of Markstein numbers of premixed flames , 1990 .

[13]  Forman A. Williams,et al.  Effects of molecular diffusion and of thermal expansion on the structure and dynamics of premixed flames in turbulent flows of large scale and low intensity , 1982, Journal of Fluid Mechanics.

[14]  H. F. Calcote,et al.  Effect of Molecular Structure on Burning Velocity. , 1959 .

[15]  P. Pelcé,et al.  Influence of hydrodynamics and diffusion upon the stability limits of laminar premixed flames , 1982, Journal of Fluid Mechanics.