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Title: Turbulent premixed combustion; Further discussions on the scales of fluctuations

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.
Authors:
 [1]
  1. (Laboratoire de Thermodynamique, UA CNRS No. 230, Faculte des Science et des Techniques de Rouen, 76130 Mont-Saint Aignan (FR))
Publication Date:
OSTI Identifier:
6806603
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; (USA); Journal Volume: 80:3
Country of Publication:
United States
Language:
English
Subject:
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