中文摘要：

基于VOF方法并考虑界面张力影响与界面重构,分别建立不同喷射流率下的非相溶两相流界面追踪模型,追踪液-液分散雾化过程中油-水两相界面变化,模拟了射流破碎和液滴形成、生长与破碎等微观特征,分析了准则数对射流破碎与液滴形成的影响机理。结果表明：所建立的界面追踪模型能模拟不同喷射流率下液-液分散雾化形成液滴过程,但高喷射速率时捕捉流场中小尺度涡破碎过程的能力仍有不足;在不同的液滴形成模式下,射流液体的破碎均具有随机性,并随喷射流率的增大而增强,射流破碎依靠两相界面的波动和失稳形成体积较小的液滴;Re、Ca和Bo准则数对滴流和层流射流时形成的液滴与射流表面及其破碎处的形状的影响比较大,而对于湍动射流而言,则主要影响射流破碎程度和形成液滴的粒径。

英文摘要：

Simulating the movement,deformation and break-up of immiscible two-phase flow interface was complex and difficult in the liquid-liquid dispersion atomization system. Based on the volume of fraction（ VOF） with role of surface tension and interface reconstruction,a model of tracking the immiscible liquid-liquid interface was built with two modes of large and small jet flow rates. The change of oil-water interface was tracked in the process of liquid-liquid dispersion atomization, the micro characteristics of jet break-up and drop formation and growth were simulated,and the mechanism of influence of Re,Ca and Bo criterion numbers on jet break-up and drop formation was also discussed. The results showed that the process of liquid-liquid dispersion atomization can be simulated by the interface tracking model set-up under different jet flow rates,but the simulation capability was short of tracking the process of small scale vortex break-up. Under different modes of drop formation,jet break-up was characterized by randomness,and enhanced with increase of jet flow rate; small droplets were formatted by the volatility and instability of two phases＇ interface. Under the modes of drop formation of trickling and laminar jet,the shape of drop,jet surface and the section of jet break-up were mainly affected by the variation of Re,Ca and Bo criterion numbers,however,for the mode of drop formation of turbulent motion jet,these criterion numbers mainly influenced the extent of jet break-up and drop size.