A numerical simulation of a vortex convected through a laminar premixed flame

Journal Article · Tue Dec 01 00:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90060-3· OSTI ID:6915366

Wu, M S; Driscoll, J F ^[1]

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1. Michigan Univ., Ann Arbor, MI (United States). Dept. of Aerospace Engineering

This paper reports that a numerical study was conducted to understand how a vortex, when convected at moderate speeds across a premixed flame, can induce velocities that pull the flame along with the vortex, causing flame elongation and unsteady flame stretch. If the vortex-induced velocity that opposes flame motion is sufficiently large, the flame cannot propagate over the vortex and thus temporarily remains attached to the moving vortex. A flame attachment criterion is discussed; when the criterion is met the vortex forms cusps and pockets in the flame structure similar to those observed experimentally. The net result of increasing the vortex convection velocity is to reduce the residence time of the vortex in the flame were found to have significantly longer residence times of interaction than vortices that exert compressive strain; this difference in residence time helps to explain why extensive strain on a flame is more probable in turbulent flames than compressive strain. The calculated images of the laminar flame shape show encouraging agreement with experiment, which is another indication that flame-interface simulations are a promising way to represent very wrinkled turbulent premixed flames in a numerically efficient manner.

• OSTI ID: 6915366
• Journal Information: Combustion and Flame; (United States), Vol. 91:3/4; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FLAMES
ELONGATION
COMPRESSION
CONVECTION
FLAME PROPAGATION
IMAGES
LAMINAR FLOW
MIXING
SIMULATION
STRAINS
TURBULENCE
VELOCITY
VORTICES
ENERGY TRANSFER
FLUID FLOW
HEAT TRANSFER
MASS TRANSFER
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
990200 - Mathematics & Computers