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Scalar dissipation rate transport in the corrugated flamelets and thin reaction zones regime for turbulent premixed flames

Chakraborty, N and Swaminathan, N Scalar dissipation rate transport in the corrugated flamelets and thin reaction zones regime for turbulent premixed flames. In: 3rd European Combustion Meeting, 2007-4-11 to 2007-4-13, Mediterranean Agronomic Institute of Chania, Crete, Greece. (Unpublished)

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Abstract

The characteristics of the scalar dissipation rate transport in the corrugated flamelets and the thin reaction zones regimes are studied based on two three-dimensional Direct Numerical Simulation (DNS) databases for freely propagating statistically planar turbulent premixed flames. The turbulent flame parameters are so chosen that the database which represents the corrugated flamelets regime has a global Damköhler number Da>1 whereas the database representing the thin reaction zones regime has Da <1. It is demonstrated that the terms originating from the correlation between fluctuating velocity and scalar gradient T1 shows strong Da dependence. The terms originating from dilatation T2, the scalar inner product of gradients of velocity and scalar fields T3 and the correlation between reaction rate and scalar gradients T4 and the dissipation term D2 remain important for both the flames. However, T3 dissipates scalar dissipation rate in the Da > 1 flame while it produces scalar dissipation rate in the Da < 1 flame. This difference is because of the change in the alignment between scalar and velocity gradients

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:34
Last Modified: 10 Mar 2014 17:20
DOI:

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