Numerical simulation of dual-orifice centrifugal nozzle liquid sheet evolution process

The complexity of the multi-scale coupling relationship in breakup and the dynamic evolution mechanism of the liquid sheet restricts the systematic cognition of the atomization mechanism, and it is difficult to establish a quantitative correlation between the evolution of the liquid sheet morphology and the breakup mode. Combined with structured mesh hierarchical encryption and dynamic self-adaptive technology, this study develops a multi-physical field coupling simulation framework by integrating the volume of fluid method, discrete phase model, and large Eddy simulation, so that the dynamic evolution of the liquid sheet and the breakup process are simulated with high accuracy. The study focuses on the dynamic evolution of the liquid sheet under different injection pressure drops of the dual-orifice centrifugal nozzle, and the reliability of the model is verified by experiments. The results show that: under the low Weber number condition, the sub fuel circuit demonstrates wavy breakup coupled with axial and circumferential fluctuation; under the high Weber number condition, the main fuel circuit indicates compound breakup dominated by turbulence breakup and supplemented by perforation and surface wave breakup; under the high Weber number cooperative fuel supply condition of both circuits, the liquid sheet of the main and sub fuel circuits generates a significant velocity gradient due to the differences in pressure and structure, which drives the continuous liquid sheet breakup mechanism to change from a single perforation mode to a turbulence-dominated one.