Numerical studies of droplet-turbulence interactions

摘要

A nonevaporating atomized spray was studied for droplet turbulent dispersion and turbulence modulation. To account for the dense spray effects, turbulence modulation models, droplet collision model, and breakup model were incorporated into a state-of-the-art multiphase all-speed transient flow solution procedure. Comparative performance of the existing turbulence modulation models are discussed in details. A parcel probability density function (PDF) approach was implemented to improve the computational efficiency in droplet dispersion calculations. The numerical results indicate that the parcel PDF model has the capability of realistically representing turbulent dispersion in dense sprays with improved efficiency over the delta function stochastic separated flow (SSF) model. Numerical predictions show good agreement with available experimental data.