2134/5904
Sreenivasa Rao Gubba
Sreenivasa Rao
Gubba
Salah Ibrahim
Salah
Ibrahim
Weeratunge Malalasekera
Weeratunge
Malalasekera
Assaad R. Masri
Assaad R.
Masri
LES modelling of propagating turbulent premixed flames using a dynamic flame surface density model
Loughborough University
2010
LES
Turbulent premixed combustion
Dynamic flame surface density
Fractal theory
Mechanical Engineering not elsewhere classified
2010-02-04 13:24:29
Conference contribution
https://repository.lboro.ac.uk/articles/conference_contribution/LES_modelling_of_propagating_turbulent_premixed_flames_using_a_dynamic_flame_surface_density_model/9558212
A Dynamic flame surface density (DFSD) model, developed recently from
experimental images for transient turbulent premixed flames, is implemented and tested using
the large eddy simulation (LES) modelling technique. Numerical predictions from DFSD
model are compared with those predicted using the flame surface density (FSD) sub-grid
scale (SGS) model for reaction rate. In the SGS-DFSD model, dynamic formulation of the
reaction rate is coupled with the fractal analysis of the flame front structure. The fractal
dimension is evaluated dynamically from an empirical formula based on the sub-grid velocity
fluctuations. A laboratory scale combustion chamber with inbuilt solid obstacles is used for
model validation and comparisons. The flame is initiated from igniting a stichiometric
propane/air mixture from stagnation. The results obtained with the DFSD model are in good
comparisons with experimental data and the essential features of turbulent premixed
combustion are well captured. It has also been observed that the SGS-DFSD model for
reaction rate found to capture the unresolved flame surface density contributions. Further
investigations are planned to examine and validate of the SGS-DFSD for different flow
geometries.