中文摘要：

采用VOF方法建立了大水滴撞击壁面的计算模型,模拟了大水滴以不同直径、不同速度撞击光滑壁面的动态撞击过程和撞击特性。计算结果表明：在大韦伯数情况下,水滴撞击光滑壁面会在铺展过程中发生边缘水滴飞溅;在水滴撞击壁面的收缩阶段,随着水滴直径的减小和水滴速度的提高,会发生液膜缓慢收缩、边缘液环和液膜分离、中心处部分液膜和边缘液膜分离、液膜完全破裂等不同结果;当水滴直径和撞击速度增大时,同一时刻水滴的铺展半径、最大铺展半径、最大铺展系数增大;水滴在壁面上达到最大铺展系数所用的无量纲时间随水滴直径增大而增大,同一直径水滴不同初始速度下达到最大铺展系数所用的无量纲时间变化较小。

英文摘要：

Dynamic characteristics of large droplet impacting on surface at high velocities were simulated using Volume Of Fluid method （VOF）.Droplet splashing was found at the spreading phase of the droplet impacting the surface at a high velocity.At the contraction phase, the phenomenon of the slow contraction,the water ring separating with the central water film, the water central film breaking into two parts and full breaking up will appear with the diameter of the droplet decreasing and the velocity of the droplet increasing.The maximum spreading diameter and the maximum spreading coefficient increase with the increasing of the droplet diameter and the droplet velocity.The dimensionless time of reaching the maximum spreading diameter increases slightly with the diameter increasing.The variation of the dimensionless time of reaching the maximum spreading diameter is small at different velocities for the same diameter droplet.