航行器小角度入水跳弹过程研究

Research on Ricochet Process of Small-angle Water-entry Vehicle

为研究跨介质航行器小角度入水的跳弹现象,基于计算流体力学软件CFX构建数值计算模型,并验证了该模型的准确性和适用性。分别对跨介质航行器不同顶角、密度及设计的环形槽类截头外形的小角度入水跳弹过程进行仿真研究,并分析了整个跳弹过程及角加速度、角速度、位移的变化规律。研究结果表明:航行器的顶角角度和密度越小,其弹道越易向上发生弯曲,越容易发生入水跳弹现象,而浸水阶段角速度突变是由于航行器尾部与水面拍击造成的;环形槽类截头尖拱体航行器具有一定的抑制跳弹的作用,其环形槽的位置对入水跳弹过程影响较大,可根据任务需求对环形槽位置进行选择。

In order to study the ricochet phenomenon of trans-media vehicle entering into water at small angle,a numerical model is built based on CFX,and the accuracy and applicability of the model are verified. The ricochet progress of the vehicle with different vertex angles,different densities and variable truncated annular grooves while entering into water at small angle are simulated. The whole ricochet progress and the change rules of angular acceleration,angular velocity and displacement during the progress are analyzed. The research results show that small vertex and density of vehicle would lead to the upward curving of ballistic trajectory,thus the ricochet phenomenon is more likely to occur,and the angular velocity mutation is due to the strike of the tail of vehicle on the water surface in the inundation stage; the truncated annular groove ogive has certain inhibitory effect on the ricochet of vehicle,and the position of the annular groove is very influential to the process of water entry,which can be chosen according to the task demands.