基于MRT-LB伪势模型的液滴撞击液膜数值研究

运用改进的格子玻尔兹曼（LB）伪势多松弛多相模型，研究单/双液滴撞击液膜的流动特性.考察单液滴在不同气液相密度比时撞击液膜的发展.随着密度比的减小，冠状水花顶端开始向内弯曲，且底部半径显著减小.在大密度比情况下研究双液滴撞击液膜.结果表明：双液滴撞击液膜有中心射流的形成；液滴水平间距的增大，延缓中心射流的出现，并降低初始中心射流的高度；随Re数的增加，中心射流的高度明显增大.

Numerical Study of Droplet Impact Liquid Film with MRT-LB Pseudo-potential Model

An improved LB pseudo-potential multi-relaxation multiphase model is used to study flow characteristics of single/dual droplets impacting liquid film. Development of liquid film impacted by a single droplet under different gas-liquid density ratio was investigated. It was found that with decrease of density ratio, top of coronal crown started bending inward, and bottom radius is significantly reduced. Then, double droplets impinging on liquid film was studied with large density ratio. It shows that a central jet was generated as double droplets impacting on liquid film. Increase of horizontal spacing between droplets delaied the appearance of central jet and reduced height of the initial central jet. With the increase of Re, height of the central jet increased obviously.