Flamelet法を用いた液相反応乱流場のLarge-Eddy Simulation(流体工学,流体機械)

概要

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Large-eddy simulations (LES) employing flamelet models are applied to turbulent reacting liquid flows and validated by comparing with the experiments. The LES is performed for a reacting mixing-layer liquid flow with rapid or moderately fast reaction downstream of a turbulence-generating grid. As the flamelet model, the steady and unsteady Lagrangian flamelet models are tested. A second-order, irreversible, and isothermal reaction (A+B→2P) is considered. The results show that the flamelet models inherently developed for turbulent combustion are applicable to turbulent reacting liquid flows provided that the model coefficient in evaluating the SGS variance of mixture fraction in the scale-similarity model (Cook and Riley, Phys. Fluids, 1994), C_z, is set to 5.0. The rapid reaction can be adequately predicted both by the steady and unsteady Lagrangian flamelet models, whereas the moderately fast reaction can be predicted only by the unsteady Lagrangian flamelet model which is capable to take slow chemical processes into account.
社団法人日本機械学会の論文
2009-10-25