Effects of heat loss, preferential diffusion, and flame stretch on flame-front instability and extinction of propane/air mixtures

Journal Article · Mon Mar 01 04:00:00 EST 1982 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(82)90054-2· OSTI ID:6222798

Ishizuka, S; Miyasaka, K; Law, C K

Flame configurations, flame-front cellular instability, and extinction of propane/air mixtures in the stagnation-point flow are experimentally studied for their dependence on downstream heat loss, preferential diffusion, and flame stretch. Boundaries for lean- and rich-limit extinction, stabilization of corrugated flames, and local extinction caused by sharp curvatures are mapped for varying propane concentrations and freestream velocities. Flame location and temperature at extinction are determined as functions of stagnation surface temperature, extent of preheating, propane concentration, and freestream velocity. Results substantiate the theoretical predictions of the different extinction modes for lean and rich flames in the absence of downstream heat loss, and yield useful insight on the extinction characteristics when finite downstream heat loss does exist. It is further shown that flame-front instability occurs only for rich mixtures in accordance with preferential diffusion considerations, and that flame stretch has a stabilizing effect such that flame-front instability is completely inhibited before the onset of extinction.

• Research Organization: Northwestern Univ., Evanston, IL
• OSTI ID: 6222798
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 45:3; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ALKANES
COMBUSTION INSTABILITY
COMPARATIVE EVALUATIONS
CONFIGURATION
DATA
DIFFUSION
DISPERSIONS
ENERGY LOSSES
FLAME PROPAGATION
FLAMES
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HEAT LOSSES
HYDROCARBONS
INFORMATION
INSTABILITY
KINETICS
LOSSES
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
PROPANE
QUENCHING
REACTION KINETICS
STAGNATION POINT
STOICHIOMETRY
THEORETICAL DATA
VELOCITY