This paper presents high-fidelity simulations of fuel injection and atomization in a hybrid air-blast atomizer for realistic gas turbine engines. In particular, the fuel injection and atomization characteristics under lean-blowout conditions are considered which corresponds to a low liquid Weber number. A Volume-of-Fluid approach is combined with a Lagrangian particle framework to accurately simulate the fuel injection and atomization for the pilot pressure-swirl atomizer. The simulation results are compared to the experimental measurements from PDPA techniques. Good agreement is found for spray angle, droplet size and droplet velocities. However, the simulation predicts an early breakup compared to the experiments due to the stringent mesh resolution requirement under low liquid Weber number conditions.
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