To achieve the analysis, control and optimization of mixing processes by means of Large Eddy Simulation (LES) technique, an advanced subgrid scale (SGS) scalar model package for the description of turbulent mixing in gaseous and liquid flows is developed and validated. This aims to strongly improve the prediction accuracy of the mixing field quantities prior to any mixing modification studies. Both non-reacting and reacting systems are considered. To cover different reaction regimes, the mixing processes with chemical reaction in jet mixer systems under investigation are described in terms of mixture fraction and two reaction progress variables. To assess the accuracy of the SGS model package and focussed on the high Schmidt-number phenomena, the results of LES are compared with experimental data and other previous simulation results for both a non-reacting jet in channel flow configuration and a confined impinging jets reactor (CIJR) featuring a parallel reaction system. The mixing and reaction processes are analyzed. Especially for the CIJR, the influence of operating conditions (active modification) on mixing properties is evaluated and a quality of measure, that is a prerequisite for mixing control and optimization in turbulent reacting flows by means of passive modification, is highlighted.
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- Mixing Analysis and Optimization in Jet Mixer Systems by Means of Large Eddy Simulation
- Springer Berlin Heidelberg