Flame propagation in a nonuniform mixture

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(89)90079-5· OSTI ID:6092496

Dold, J W

For flames propagating through a nonuniform medium a three-flame structure is described. This consists of a fuel-rich premixed flame, a fuel-lean premixed flame, and, starting where these flames meet, a diffusion flame. Such formations have been observed experimentally and probably occur as laminar flamelets in turbulent diffusion flames. A low-heat-release model for such flame structures is developed and solutions are obtained in the limit of slowly varying premixed flames. Under these conditions, it is shown that the Triple-Flame propagation speed depends on the transverse mixture fraction gradient and is bounded above by the maximum adiabatic laminar flame speed of the system.

• Research Organization: Univ. of Bristol, Univ. Walk, Bristol BS8 1TW (GB)
• OSTI ID: 6092496
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 76:1; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADIABATIC PROCESSES
COMBUSTION PROPERTIES
DATA
DIFFUSION
DISPERSIONS
ENERGY LOSSES
EXPERIMENTAL DATA
FLAME PROPAGATION
FLAMES
FLUID FLOW
FUELS
HEAT LOSSES
INFORMATION
LAMINAR FLOW
LOSSES
MIXTURES
NUMERICAL DATA
TURBULENT FLOW