Calculation of extinction limits for premixed laminar flames in a stagnation point flow

Journal Article · Sun Feb 01 04:00:00 EST 1987 · J. Comput. Phys.; (United States)

DOI:https://doi.org/10.1016/0021-9991(87)90061-1· OSTI ID:6508321

Giovangigli, V; Smooke, M D

Conclusions derived from the solution of premixed laminar flames in a stagnation point flow are important in the study of pollutant formation, the determination of chemically controlled extinction limits and in the ability to characterize to combustion processes occurring in turbulent flames. In the neighborhood of the stagnation point produced in these flames, a chemically reacting boundary layer is established. For a given equivalence ratio, the input flow velocity can be varied and solutions can be determined for increasing values of the strain rate. As the strain rate increases, the flame nears extinction. In the vicinity of the extinction point, however, the Jacobian of the system becomes singular. To avoid computational difficulties, we employ numerical bifurcation techniques to generate the appropriate steady-state profiles (both physical and nonphysical). The method is applied to study the extinction behavior of a one-step kinetics model of a premixed hydrogen-air and methane-air flame in a counterflow geometry. copyright 1987 Academic Press, Inc.

• Research Organization: Laboratoire de Mecanique Theorique, Universite Paris, and Laboratoire d'E-acute-accentnergetique, E-acute-accentcole Centrale des Arts et Manufactures, France
• OSTI ID: 6508321
• Journal Information: J. Comput. Phys.; (United States), Journal Name: J. Comput. Phys.; (United States) Vol. 68:2; ISSN JCTPA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ALKANES
BOUNDARY LAYERS
ELEMENTS
FLAMES
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
LAYERS
METHANE
NONMETALS
ORGANIC COMPOUNDS
STAGNATION POINT