Development of a modified dynamic flame thickened model for laminar premixed hydrogen/air flames

This work proposes a modified dynamic flame thickened model for laminar premixed hydrogen/air flames and describes flame simulations conducted for validation. The model is implemented on the open-source OpenFOAM v9, and four flame configurations are simulated: 1D laminar premixed flames, axi-symmetric stagnation-point flames, axi-symmetric Bunsen flames, and 2D bluff body flames. The 1D flame simulation reconfirms the validity of the thickened flame models. The axi-symmetric stagnation-point flames are simulated to find the optimal modification factor, a modeling parameter. The axi-symmetric Bunsen flame simulations are conducted for validation, and the results showed that the flame speed and stretch rate are well maintained. The 2D bluff body flame simulations are then conducted, and the results confirmed that the proposed model can produce stretched laminar flame speeds that are similar to those of the non-thickened reference cases, especially at low equivalence ratio conditions. Finally, the 2D bluff body flame simulations showed that the proposed model has reasonable prediction accuracy compared with the reference data.