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Abstract
ABSTRACTA brief review is presented of so-called laminar flamelet models of turbulent combustion processes, using premixed combustion as an example. Circumstances where this simple modeling strategy can fail are explored.
Highlights
It is widely accepted that combustion of hydrocarbon fuels contributes to global warming, and should be curtailed, the necessary alternative power sources are not yet widely available
One class of model that can be used for this purpose is based on the assumption that a turbulent flame can be approximated by a laminar flame which is distorted and wrinkled by the flow but retains the internal structure of a laminar flame. This so-called laminar flamelet approximation which is widely used in both RANS (Libby & Williams, 1980; Peters, 2000) and LES (Nambully et al, 2014; Knudsen et al, 2013; Butz et al, 2015) calculations is the subject of the present brief review
probability density function (PDF) for the reaction mode, where the subscript indicates that this is to be evaluated in the laminar flamelet approximation
Summary
It is widely accepted that combustion of hydrocarbon fuels contributes to global warming, and should be curtailed, the necessary alternative power sources are not yet widely available. We shall identify several different types of laminar flamelet model, and discuss their advantages and circumstances in which they may fail. A second type of flamelet model estimates the mean reaction rate as ωc = ρR SL0Σ
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