Diffuse Interface Eulerian Spray Atomization Modeling of Impinging Jet Sprays

摘要

An Eulerian spray atomization model, designed for representing the dense spray core, has been used in a combined internal and external flow simulation to predict the liquid mass distribution of impinging jet sprays. A diffuse interface approach employed Kick's law of diffusion to model atomization driven by turbulent mixing. The solver uses a RANS framework with a single, mass-weighted velocity field to represent the highly variable density flow. Simulations were validated with time-averaged x-ray attenuation experiments. The angle of impingement was 60 degrees, the working fluid was water, the diameter of the jets was 0.02 inches, and mean injection velocities were 30, 60, and 90 feet per second. The corresponding jet Reynolds numbers were approximately 5,200, 10,300, and 15,500. The CFD results achieved good agreement with experiments, particularly in the near nozzle region. Agreement is better for the higher Reynolds number cases where interfacial dynamics are less significant. The assumptions and performance of this modeling approach indicate that interfacial details are of secondary importance in such sprays and suggest that diffuse interface models would be well-suited to the high operating pressures typical of combustion chambers.