Large Eddy Simulation of NO Formation in Non-Premixed Flames Based on Dual-Scale Flamelet/Progress Variable Model
Based on the flamelet/progress variable(FPV)model,a dual-scale flamelet/progress variable model with transported NO correction is proposed.On the basis of the proposed model,the large eddy simulation of Sandia non-premixed methane jet flames is conducted.The results show that the proposed model significantly improves the prediction accuracy of NO.Moreover,the large eddy simulations of sandia flame F with local extinction are conducted to explore the NO formation characteristics in the condition of flame instability.The comparisons show that with the Reynolds number increasing from 22400 to 44800,flame F shows about 28％decrease in peak NO magnitude at the central axis compared to flame D.The proposed model successfully captures the local extinction caused by the increase of Reynolds number and the suppressed trend on the NO formation.
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