A sub-grid scale combustion model based on thickened-flame method and REDIM chemistry table

摘要

The reaction-diffusion manifold (REDIM) technique is utilized in combination with the dynamically thickened-flame (DTF) model, which forms a new turbulent premixed combustion model, REDIM-DTF. The new model was then used to calculate two turbulent premixed swirling flames in PRECCINSTA combustor via LES, with equivalence ratio equals to 0.75 and 0.83, respectively. The radial profiles of velocity, temperature and CO_2 mass fraction as well as the flame surface area were analyzed and compared with the results from original DTF model and the experimental data. The results are in good overall agreement with corresponding experiment. Since less species transport equations are solved in REDIM-DTF model, the computational efficiency of it is about 15% higher than the original DTF model. In theory, the new model can also be applied to simulate partially premixed flames, as long as an appropriate REDIM chemistry look-up table is used, e.g. two-dimensional table.