空泡演化对航行体高速入水运动特性的影响研究

Influence of Cavity Evolution on Motion Characteristics of High-Speed Projectile Water Entry

为了研究空泡演化与航行体运动特性之间的联系,并进一步探讨入水速度和入水角度对航行体运动特性的影响,文中基于STAR-CCM+,耦合SSTk-ω湍流模型、VOF界面捕捉方法和重叠网格技术,对航行体高速入水过程中空泡从生成到溃灭的整个发展演化过程进行了数值计算研究.结果表明,航行体高速入水过程中空泡的发展演化可以分为3个阶段:空泡稳定发展阶段、空泡断裂溃灭阶段、空泡脱落再生阶段.垂直入水条件下,提高入水速度能够延迟二次射流对航行体扰动时间,增强航行体维持初始入水弹道的能力;斜入水条件下,增大入水角度能够减缓航行体在入水前期的姿态变化,但会降低其在入水后期维持初始入水弹道的能力.

In order to study the relationship between the cavity evolution and the motion characteristics of the vehicle,to explore the influence of the water entry velocity and the water entry angle on the motion characterist-ics of the vehicle,the whole development and evolution process of cavity was numerically studied from genera-tion to collapse during the high-speed water entry of the vehicle based on STAR-CCM+,coupled with SST k-ωturbulence model,VOF interface capture method and overlapping grid technology.The results show that the de-velopment and evolution of the cavity during the high-speed water entry of the vehicle can be divided into three stages,the stable development stage of the cavity,the collapse stage of the cavity,and the shedding-regeneration stage of the cavity.Under the condition of vertical water entry,increasing the speed of water entry can delay the time of secondary jet and enhance the ability of the vehicle to maintain the initial water entry trajectory.Under the condition of oblique water entry,increasing the water entry angle can slow down the attitude change of the vehicle in the early stage of water entry,but it will reduce its ability to maintain the initial entry trajectory in the later stage of water entry.