Mixing Models for Turbulent Flows with Exothermic Reactions
The potential influence of age-biased sampling for mixing as suggested by Pope (1982) was investigated for turbulent reacting and nonreacting jet flows with a modified coalescence/dispersion (C/D) model. Age-biased sampling is found to have little influence on the predicted scalar statistics up to fourth moments. To account for the combined effects of mixing and chemical reaction on the joint probability density function (pdf), the modified C/D model is further improved by conditioning the mixing process on the existence of the reaction zone. Monte Carlo simulation of turbulent reacting jet flames with an ideal flame-sheet chemical model demonstrates that the proposed model is capable of predicting physically correct results in the flame-sheet combustion regime.
KeywordsReaction Zone Mixture Fraction Scalar Space Radial Profile Scalar Dissipation
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