Propagation of premixed gaseous explosion flames in porous media

Journal Article · Fri Nov 01 00:00:00 EST 1991 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(91)90168-B· OSTI ID:5490611

Babkin, V S; Korzhavin, A A; Bunev, V A ^[1]

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1. Institute of Chemical Kinetics and Combustion, Novosibirsk 630090 (SU)

This paper reports on flame propagation velocities that have been measured for methane-air and propane-air mixtures in four kinds of porous medium, with varying initial parameters such as pressure (from 0.06 to 2.5 MPa), equivalence ratios (0.70-1.65), and the characteristic size of cavity space (1.15-4.5 mm). All the data are well correlated by the general dependence Re = C {center dot} Pe{sup 3}, where Re is the Reynolds number based on the difference between flame propagation speed, S, and laminar burning velocity, S{sub u}, Pe is the Peclet number based on S{sub u}, and c is an experimental constant. The dependence may be derived theoretically based on two assumptions: the flame propagation velocity in turbulent moving gas is determined by the maximum flow pulsation V{sub m}, S = V{sub m} + S{sub u}; and at increasing values of V{sub m}, greater heat losses from the flame front into the porous medium occur until, finally, the flame is quenched. Some deviations from the general dependence observed for rich propane mixtures are explained by the manifestation of thermal-diffusive instabilities that are controlled by the Lewis number and neglected in a theoretical model.

• OSTI ID: 5490611
• Journal Information: Combustion and Flame; (United States), Vol. 87:2; ISSN 0010-2180
• Country of Publication: United States
• Language: English

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37 INORGANIC
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42 ENGINEERING
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TURBULENT FLOW
METHANE
COMBUSTION KINETICS
FLAME PROPAGATION
PROPANE
AIR FLOW
CAVITIES
CHEMICAL EXPLOSIONS
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REYNOLDS NUMBER
SIZE
THERMAL DIFFUSIVITY
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ORGANIC COMPOUNDS
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REACTION KINETICS
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