Turbulent premixed combustion; Further discussions on the scales of fluctuations

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Combustion and Flame; (USA)

DOI:https://doi.org/10.1016/0010-2180(90)90106-2· OSTI ID:6806603

Borghi, R ^[1]

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1. Laboratoire de Thermodynamique, UA CNRS No. 230, Faculte des Science et des Techniques de Rouen, 76130 Mont-Saint Aignan (FR)

The prediction of turbulent combustion is classically performed by numerical integration of modeled equations. For each existing approach, a crucial quantity is a time scale for the destruction of temperature (or concentration) fluctuations. Usually, this time scale is simply taken as proportional to the corresponding time scale for velocity fluctuations, but the question of the influence of the reaction on this scale arises, and has already been discussed. The authors discuss this point in the particular case of wrinkled premixed flames. Algebraic closure formulas, as well as closures based on the so-called {epsilon}{sub y} equation, or on the equation for the flame surface by unit of volume of Marble and Broadwell, are proposed and discussed. It is found, in particular, that in the case of wrinkled flames with infinite Damkohler and Reynolds numbers the reaction does not play any direct role on the time scale.

• OSTI ID: 6806603
• Journal Information: Combustion and Flame; (USA), Vol. 80:3; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
FLAMES
COMBUSTION KINETICS
FUELS
MIXTURES
TURBULENT FLOW
EQUATIONS
REYNOLDS NUMBER
TEMPERATURE GRADIENTS
CHEMICAL REACTION KINETICS
DISPERSIONS
FLUID FLOW
KINETICS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
420400 - Engineering- Heat Transfer & Fluid Flow