A numerical study of turbulent flame speed models for H2/CH4/Air premixed combustion

This study has assessed the validity of the commercially available turbulent flame speed models within ANSYS Fluent as applied to hydrogen/methane/air combustion, with 5 different fuel compositions considered from 100% methane to 100% hydrogen. It was found that existing turbulent flame speed models were capable of producing accurate predictions up to 60% hydrogen with the Zimont model being the best performing model. However beyond 60% hydrogen content the accuracy of the predictions degraded dramatically. As a result of this attempts were made to improve the results by tuning the Zimont turbulent flame speed constant, however this produced minimal improvement in the results. Finally a modification was developed and used in tandem with the exponential effective Lewis number term taken from literature, this elicited a significant improvement in the results at 80% and 100% hydrogen.