Premixed flames in stagnating turbulence. Part 3; The k [emdash] [epsilon] theory for reactants impinging on a wall

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90098-A· OSTI ID:7164091

Bray, K N.C. ^[1]; Champion, M ^[2]; Libby, P A ^[3]

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1. Cambridge Univ. (United Kingdom)
2. Lab. d'Energetique and de Detonique, URA 193 au CNRS-ENSMA, 86034 Poitiers (France)
3. California Univ., San Diego, La Jolla, CA (United States)

In this paper, turbulent flames stabilized in a stagnating reactant stream impinging on an adiabatic surface are analyzed on the basis of the [bar k]-[bar [epsilon]] theory. Asymptotic methods are used to describe the flow in each of the three identifiable regions in the low, with matching requirements providing the boundary conditions for the solutions applicable to each. The flame is assumed to be in the neighborhood of the wall so that reactants are present at the wall at least a fraction of the time. The results with respect to the vigor of the flame and to its extinction characteristics in terms of an extinction Damk[umlt o]hler parameter are in qualitative agreement with an earlier study of flames in opposed reactant streams. Thus as the mean rate of strain decreases the flame becomes more vigorous and its reaction zone assumes positions more remote from the wall. The production of turbulent kinetic energy is found to be significantly influenced by coupling between the mean axial pressure gradient and density inhomogeneities.

• OSTI ID: 7164091
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 91:2; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADIABATIC PROCESSES
ASYMPTOTIC SOLUTIONS
BOUNDARY CONDITIONS
CHEMICAL REACTIONS
COUPLING
DENSITY
ENERGY
FLAMES
FLUID FLOW
KINETIC ENERGY
MIXING
PHYSICAL PROPERTIES
PRESSURE GRADIENTS
STABILIZATION
STAGNATION
SURFACES
TURBULENCE
WALLS