Abstract
The validation and proposal of SGS combustion model for turbulent premixed flames are conducted by using direct numerical simulation data. The conventional SGS combustion model, which represents the SGS turbulent burning velocity as a monotonically increasing function of SGS turbulence intensity, fails to represent the filtered DNS data. From the hierarchical structures of turbulent premixed flames, a strong correlation of SGS flame surface area with GS strain rate of turbulent velocity field has been clarified. A new SGS combustion model has been proposed under assumptions of fractal characteristics of flame fronts and the scale separation of turbulence. The predicted results by the proposed model coincide very well with DNS results.
