浅水区串联航行体超空泡流动特性研究

Research on Flow Characteristics of Supercavitation of Series Vehicles in Shallow Water

为了研究浅水区串联航行体超空泡流动特性,采用VOF多相流模型建立了空气、水、水蒸气的混合相的连续性方程和动量方程,对串联航行体在浅水区形成的超空泡流场进行了数值模拟,研究了水深和航行体间距对超空泡流动的影响。研究结果表明:前后串联航行体在运动过程中均会形成超空泡,且空泡的初始形态、轮廓近似,并在自由面激起先导波浪;在浅水区,会有上方空气卷入超空泡内,但是随着水深的增加,上方空气不再卷入空泡内;随着航行体间距的增大,充分发展阶段的超空泡轮廓变得越加平缓,当间距大于5倍的航行体长度时,不同间距下的串联航行体超空泡轮廓无明显差异。

In order to study the supercavitating flow characteristics of series vehicles in shallow water,the continuity equation and momentum equation of the mixed phase of air,water and steam were established by using the Volume of Fluid multiphase flow model.The supercavitating flow field of series vehicles in shallow water was numerically simulated,and the effects of water depth and vehicle spacing on supercavitating flow were studied.The results show that,in the motion course of vehicles with the forward and backward series,the supercavitation will form,and the initial shape and outline of the bubble are similar,and the leading waves will be excited on the free surface.In shallow water,there will be air above the supercavitation,but with the increase of water depth,the air above the supercavitation is no longer involved in the cavitation.With the increase of the spacing between vehicles,the contour of supercavity becomes smoother in the full development stage.When the distance is greater than 5 times the diameter of the vehicle,there is no significant difference in the supercavity profile of the series vehicles with different spacing.