A new filtered tabulated chemistry model for multi-regime combustion: A priori validation on a laminar triple flame
Résumé
The use of flamelet-type approaches in Large-Eddy-Simulations (LES) remain popular due to their low CPU cost. Of the many flamelet-type approaches, multi-regime flamelet tabulations have emerged as an attractive solution for capturing partially-premixed flame structures. Two key challenges associated with multi-regime flamelet tabulation are correctly distinguishing between different combustion regimes and the coupling with the LES, where flame structures are unresolved at the mesh scale. The F-TACLES (Filtered tabulated chemistry for LES) model is formally extended to multi-regime combustion by incorporating the partially-premixed tabulation strategy 2PFT. This new F-TACLES model utilises the tabulation coordinates of filtered mixture fraction, filtered progress variable and the resolved scalar dissipation rate of the mixture fraction. A priori tests are undertaken on 1D flames with varying archetypes and finally a 2D triple flame with varying levels of mixture fraction gradients is tested. The multi-regime F-TACLES approach is validated and is shown to outperform mono-archetype F-TACLES models.
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