空泡演化对航行体高速入水运动特性的影响研究

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 characteristics of the vehicle, the whole development and evolution process of cavity was numerically studied from generation to collapse during the high-speed water entry of the vehicle based on STAR-CCM+, coupled with SST k-ω turbulence model, VOF interface capture method and overlapping grid technology. The results show that the development 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.