Large-Eddy Simulation on the Effect of Droplet Size Distribution on Mixing of Passive Scalar in a Spray

摘要: In this work simulation results of a round spray jet are presented using the combination Large-Eddy Simulation (LES) and Lagrangian Particle Tracking (LPT). The setup serves as synthetic model non-atomizing particles taken from Rosin-Rammler size distribution that enter chamber filled with gas through an inlet hole diameter D. At velocity droplet velocities specified in addition to initial droplets. Reynolds number referred inflow is Re=10000. advantageous for understanding details diesel sprays since it avoids near-nozzle modeling thereof corresponding error which especially important LES. Here, implicit LES applied so compressible Navier-Stokes equations solved directly numerical algorithm fine mesh without subgrid scale model. approach diffusion becomes 'implicitly' modeled by ever-present low order schemes typical engineering computations assumed thereby give more clear picture two-way particle-turbulence interaction. Two-way momentum coupling between phases considered be adequate relatively dilute loadings smaller than 0.002. Results two given mass loading ratios varying Sauter mean Stokes particle sizes St > 2. show these setups droplets enhance mixing comparison single phase jet. It demonstrated dispersion pattern profile depend on distribution. Spatial structure visualized accumulation certain regions flow visualized. explained physical terms related conditions sizes.