Abstract
Fine atomization of the liquid jet from a fuel injector in an automobile engine lowers engine emissions and improves fuel efficiency. Simulation of liquid-film breakup near the injector outlet is useful for predicting the atomization. However, grid methods and particle methods require a large amount of computation time in the practical engineering aspect because fine meshes smaller than liquid films or a large number of particles are needed. In this study, we have tried to simulate the breakup of liquid films by using groups of particles in the particle method. In the simulation, the particle method was applied only to the liquid film and the grid method was used in other areas to shorten the computation time. We then simulated the breakup of a liquid film near the outlet of a fuel injector used for automobile engines, and found that our hybrid method could simulate the breakup of the liquid film into ligaments.
