Application of universalities in fragmentation under scaling symmetry to modelling of primary air-blast atomization in a high Weber number turbulent spray

摘要

This work presents a model of primary air-blast atomization in a high Weber number turbulent spray. In this model, the primary atomization is simulated stochastically: the reducing of thickness of the liquid core in down-stream direction is governed by fragmentation under scaling symmetry. From statistics of liquid bulk in the vicinity of injector, the liquid drops are sampled using presumed distribution of size and conservation of the liquid mass. The drops are subjected to the secondary atomization and coalescence. These two phenomena are simulated stochastically as result issued from inter-drop collision. The spray modeling is coupled with LES computation in the gaseous flow. The results of computation are compared with measurements: for the distribution of liquid fraction in the vicinity of injector (at different inlet velocities of the gas and the liquid); and in the far-field of the spray, for the mean Sauter diameter.