Extinction of a stagnation-point diffusion flame at reduced gravity

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · AIAA J.; (United States)

DOI:https://doi.org/10.2514/3.9730· OSTI ID:5983531

T'ien, J S; Foutch, D W

The extinction limits of a diffusion flame in the stagnation-point boundary layer of a solid fuel in mixed-, natural-, and forced-convective flows are determined numerically. The flow is characterized by a mixed-convection stretch rate and a densimetric Froude number. The results depend primarily on stretch rate and only slightly on Froude number. The computed results show that in addition to the familiar blowoff limit, which occurs at large stretch rate, an extinction limit due to radiative heat loss from the fuel surface is found at very low stretch rate. These two extinction boundaries merge to define a fundamental low oxygen limit. The difference of this oxygen limit for forced and buoyancy-driven flows is found to be slight. 11 references.

• Research Organization: Case Western Reserve Univ., Cleveland, OH
• OSTI ID: 5983531
• Journal Information: AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 25; ISSN AIAJA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
BOUNDARY LAYERS
CONVECTION
DIFFUSION
ELEMENTS
ENERGY TRANSFER
FLAMES
FORCED CONVECTION
FROUDE NUMBER
FUELS
HEAT TRANSFER
INHIBITION
LAYERS
MASS TRANSFER
NATURAL CONVECTION
NONMETALS
OXYGEN
SOLID FUELS
STAGNATION POINT