Sub-grid Scale Modeling of Turbulent Spray Flame using Regularized Deconvolution Method

摘要

A new model based on regularized deconvolution methods (RDM) is developed for the closure of sub-grid scale (SGS) terms in turbulent spray combustion. Previous a priori numerical studies of these flames have identified sensitivities to the turbulence-droplet and turbulence-flame interactions. The objective of this work is to examine effects of the SGS closures though large-eddy simulations (LES) of an acetone spray flame. A series of experiments of turbulent spray flames were conducted at the University of Sydney to establish a benchmark database to support model developments, including the measurements of the target acetone spray flame. Three LES cases using different modeling combinations for the SGS turbulence-droplet and turbulence-flame interactions are conducted to assess the performance of the new model. Systematic model evaluations show that the consideration of SGS turbulence-droplet interactions using RDM improves the prediction of gas-phase combustion downstream where the mesh is coarse. Further improvement in temperature prediction is observed in the case where RDM is also used as the closure for turbulence-flame interaction.