基于双向流固耦合的航行体高速入水研究
Research on High-speed Water Entry of Vehicle Based on Two-way Fluid-Structure Coupling
鱼怡澜 1施瑶 1潘光1
作者信息
- 1. 西北工业大学航海学院,西安 710072;西北工业大学无人水下运载技术重点实验室,西安 710072
- 折叠
摘要
基于弹性体假设对直径为0.533 m、以100 m/s速度入水的航行体建立了高精度流固双向耦合数值模型,并试验验证了该数值模型的有效性.进行了不同角度的入水仿真,获得空泡及载荷的演变规律.主要结论如下:随着入水角减小,喷溅水幕的闭合时间推迟,空泡非对称性加剧;弹性体在入水时承受的冲击载荷峰值小于刚性体,且呈振荡衰减趋势;航行体应力峰值呈圆环形分布,应力在入水初期出现峰值并振荡衰减,而且在尾部出现应力集中;斜入水时,应力分布及头部纵向变形不对称.随着入水角的增大,应力和应变的峰值增大,应力波传播时间缩短.
Abstract
Based on the elastomer hypothesis,a high-precision bidirectional fluid-structure coupling numerical model is established for a vehicle with a diameter of 0.533 m and entering water at a speed of 100 m/s,and the validity of the numerical model is verified by experiments.The evolution law of the cavitation and load is obtained through water entry simulation at different entering angles.The main conclusions are as follows.With the decrease of the water entry angle,the closing time of the splash curtain is delayed,and the asymmetry of cavitation is intensified.When the elastomer enters the water,the peak value of the impact load is smaller than that of the rigid body,and the trend of oscillation attenuation is shown.The peak stress of the vessel is distributed in a circular pattern,and the stress oscillates and attenuates at the initial stage of water entry,which concentrates at the tail.The stress distribution and the longitudinal deformation of the head are asymmetrical during oblique water entry.With the increase of the water entry angle,the peak value of stress and strain increases,and the propagation time of the stress wave becomes shorter.
关键词
高速入水/流固耦合/空泡/冲击载荷Key words
high-speed water entry/fluid-structure coupling/cavity/impact load引用本文复制引用
基金项目
国家自然科学基金(U21B2055)
国家自然科学基金(52171324)
基础科研项目(JCKY2021607B031)
基础科研项目(JCKY2021206B012)
中央高校基本科研业务费专项(3102019JC006)
出版年
2024
NETL
NSTL
万方数据