带泡沫头帽圆柱体入水机理实验研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (20) : 263-274.

论文

带泡沫头帽圆柱体入水机理实验研究

王岳扬1，2，陈绍露2，3，龙镜冰1，2，汪家威1，2，陈莹玉1，2

作者信息 +

An experimental study on the water entry mechanism of a cylinder with foam cap

WANG Yueyang1,2, CHEN Shaolu2,3, LONG Jingbing1,2, WANG Jiawei1,2, CHEN Yingyu1,2

Author information +

文章历史 +

摘要

航行体跨介质高速入水瞬间经受的撞击力可威胁其结构安全和其入水弹道的稳定性。为探讨入水冲击对结构的影响，以带泡沫头帽圆柱体为试验研究对象，探究不同入水速度和角度状态下不同头型泡沫降载头帽的入水冲击运动特性。实验中，利用高速摄像技术捕捉带头帽圆柱体的入水空泡形态特征，并基于Canny边缘检测算法对空泡特征进行参数分析；与此同时通过内置加速度传感器获得其入水加速度，利用CEEMD方法进行滤波分析。通过对试验过程的图像和传感器测量结果分析，获得了不同速度、角度和头型圆柱体入水的空泡演化特征和加速度的变化规律及其变化原因，并对比了不同降载方式的降载效果。试验结果表明，圆柱体入水冲击加速度随速度的平方线性增加；头型对圆柱体低速入水的缓冲效果最为明显，带圆锥形外形头帽降载效果达到了86.8%，圆锥形泡沫头帽的降载缓冲效果达到了97%。此外，实验中还观测到了圆柱体入水空泡深闭合后尾空泡逐次脱落的现象，该现象对圆柱体形成逐渐递减的脉动冲击；PMI泡沫头帽不会改变入水空泡的形态，但会使空泡壁面粗糙模糊。

Abstract

The impact force experienced by a vehicle entering water at high speed across media can threaten its structural safety and the stability of its entry trajectory. In order to explore the influence of water entry impact on the structure, the cylinder with foam head cap was taken as the experimental research object to explore the water entry impact load characteristics of different foam head caps under different water entry speeds and angles. In the experiment, high-speed camera technology was used to capture the shape characteristics of the water inlet bubbles of the cylinder with a leading cap, and the bubble features were analyzed based on the Canny edge detection algorithm; At the same time, the water impact load is obtained through the built-in accelerometer, and the CEEMD method is used for filtering load analysis. By analyzing the images and sensor measurement results of the experimental process, the evolution characteristics of bubbles and the variation rules of acceleration in water entering different speeds, angles, and head shaped cylinders were obtained, and the reasons for these changes were compared. The load reduction effects of different load reduction methods were also compared. The experimental results show that the load on the cylinder entering the water increases linearly with the square of the velocity; The head shape has the most obvious buffering effect on the low speed water entry load of the cylinder. The load reduction effect of the head cap with conical shape reaches 86.8%, and the load reduction and buffering effect of the conical foam head cap reaches 97%. In addition, the experiment also observed the phenomenon of the tail bubbles gradually falling off after the deep closure of the water entering bubbles of the cylinder, which formed a gradually decreasing pulse load on the cylinder; PMI foam head cap will not change the shape of water entering cavitation, but will make the cavitation wall rough and fuzzy.

导出引用

王岳扬1, 2, 陈绍露2, 3, 龙镜冰1, 2, 汪家威1, 2, 陈莹玉1, 2. 带泡沫头帽圆柱体入水机理实验研究[J]. 振动与冲击, 2024, 43(20): 263-274

WANG Yueyang1, 2, CHEN Shaolu2, 3, LONG Jingbing1, 2, WANG Jiawei1, 2, CHEN Yingyu1, 2. An experimental study on the water entry mechanism of a cylinder with foam cap[J]. Journal of Vibration and Shock, 2024, 43(20): 263-274

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