Atomization Process of Liquid Jet with Turbulence Induced by Cavitation

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Improvement in thermal efficiency and reduction in emissions of internal combustion engines are expected. In order to clarify the cavitation taking place in a nozzle of a liquid injector and its effects on liquid jet atomization process, high-speed visualizations and numerical simulations of cavitation in nozzles are carried out. As a result, the effects of geometry, length-to-diameter ratio of nozzles and asymmetric inflow on cavitation and discharged liquid jets are clarified. It is clarified that cavitation in various nozzles with different geometries can be predicted by using a modified cavitation number. Numerical method based on LES, bubble tracking model and Rayleigh-Plesset equation enables us to simulate unsteady cavitation in a nozzle.